Corrosion on Sections ofCorrosion Probe Removed from Tank .../67531/metadc... · Figure 6. Microphotograph (10 times) ofSpecimen S06ROO1024. Detector I Bullet, Uncleaned, Scale Bar=

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RPP-RPT-32425, Rev. 0

Final Analytical Results from the Examination ofCorrosion on Sections of Corrosion ProbeRemoved from Tank 241-AN-107 onAugust 10, 2006

G. A. Cooke lind J. B. DUD(~an

CU2M Hill Hanford Group, Inc.Richland, WA99352U_S. Department of Energy Contract DE-AC27-99RL14047

EDT/ECN:Cost Center:

B&R Code:

DRF7S110

uc:Charge Code:

Total Pages: 54

Key Words: Tank 241.AN-I07, crevice, sltess, pitting, corrosion, optical microscopy, scanning electronmicroscopy, Coring, hullet, electrochemical, noise, probe, specimens, analytical results, examination,macrophotogrllphy, photomicrograph, dete<:tor 1, detector 2, detoctor 3, detector 4, nonstressed, stressed,pre--strcssed, disassembly, hot cell

Abstract Tank Farms Operations removed an electrochemical noise probe from Tank 241-AN-I07. Inthe field, the probe was cut into four s.ectiolUl., wrapped, and placed in a 55-gallon drum, This. drum wa."delivered to the 222-S Laboratory. The 222 S Laboratory unpackaged the sections of the AN-IO?electrochemical noise probe and examil1ed the material for evidence of corrosion. Each of the fuur sectionscnntaincd Ilm:e C.ring and three bullet specimen'!. The specimens were cxamined for pilting corrosion,cre\·ice corrosion, and stress corrosion cracking. No evidence of streslJ corrosion cracking was found inthe stressed C-ring spedmel1s. )Arnor pitting was evident on some surfuces. Crevice corrosiol1 was thedominant type ofcorrosion obsl.'TVed.

TRADEMARK DISCLAIMER. Referellce herein to any speciftc commercial product, process. or service by trade name.tradernarl<, manufacturer, or otherwise, does not neC8ssarily constitute or Imply Its endorsement. recommendation, orfavoring by the United States Government or any agency Ihemof or its contradors or 5uOConlraclor5.

Pr~nted in the United Slales of America. To obtain copies of Ihls document, contact: Doclxnent Control Services,P.O. Box 950, Mailstop H6-08, RicI11and WA 99352, Phone (5C9) 372-2420; Fax (509) 376-4989.,...--------,

10:

dRELEA~E

DA.TE:

STA.; l(MAR 222

Release Stamp

Approved For Public Release

A-6002-767 (REV 1)

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RPP-RPT-32425Re\'ision 0

FINAL ANALYTICAL RESULTS FROM THEEXAMINATION OF CORROSION ON SECTIONS OFCORROSION PROBE REMOVED FROMTANK 241·AN·107 ON AUGUST 10, 2006

G. A. CookeJ. B. DuncanCH2M HILL Hanford Group, Inc.

Date PublishedMarch 2007

• CH2MHILL,.. Hanford Group, Inc.

Prepared for the U.S. Department of EnergyOffice of River Protection

Contract No. DE-AC27-99RLI4047

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CONTENTS

1. SUMMARY 1

2. INTRODUCTION 1

3. SAMPLE PREPARATION AND ANALYSIS 5

4. DISCUSSION 19

5. REFERENCES 21

APPENDIX A. Image Names and Locations from the Examination of241-AN-107Electrochemical Noise Probe Specimens A-I

l.ist of Figures

Figure 1. General View ofDetector 1 Dilling Disassemhly in Hood 3

Figure 2. Removal of Cross Bar from Detector 4 in Hot Cel1. 3

Figure 3. General View ofDetector 2 During Disassembly in Hot Cell. 4

Figure 4. General View ofDetector 3 During Disassembly in Hot Cell. 4

Figure 5. General View ofDetector 4 During Disassembly in Hot Cell 5

Figure 6. Microphotograph (10 times) of Specimen S06ROO1024. Detector I Bullet, Uncleaned,Scale Bar = 1 mm 6

Figure 7. Macrophotograph Specimen S06ROO1027, Detector 1, Stressed C-Ring, Uncleaned 7

Figure 8. Macrophotograph Specimen S06R001 033, Detector 2, Stressed C-Rin& Uncleaned 7

Figure 9. Macrophotograph Specimen 806R001036, Detector 3, Bullet, Uncleaned 8

Figure 10. Macrophotograph Specimen S06ROO1038, Detector 3, Nonstressed C-Ring,Uncleaned 8

Figure 11. Macrophotograph Specimen S06ROO1039, Detector 3, Stressed C-Ring, Uncleaned. 9

Figure 12. Macrophotograph Specimen 806ROOI042, Detector 4, Uncleaned 9

Figure 13. Macrophotograph Specimen S06ROO1045, Detector 4, Stressed C-Ring, Uncleaned........................................................................................................................................................ 10

Figure 14. Macrophotograph of the Top ofVapm Space Nonstressed C-Ring S06ROO1028..... 12

FiguTe 15. SEM Microphotograph of the Top of ·Vapor Space Nonstressed C-RingS06ROOl028 12

Figure 16. SEM Photomicrograph ofthc Face ofPrcMstressed Crack, Specimen S06ROO1027. 13

Figure 17. SEM Photomicrograph of the Face of Pre-stressed Crack, Specimen S06ROO1027. 14

Figure 18. SEM Photomicrograph of the Face ofPre-stressed Crack, Specimen S06ROOJ033. 14

Figure J9. SEM Photomicrograph ofthe Face ofPre-stressed Crack, Specimen S06ROOI045. 15

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Figure 20. SEM Photomicrogmph of the Polished and Etched Surface of Pre-stressed Crack,Specimen S06ROOI027 16

Figure 21. SEM Photomicrograph of the Polished and Etched Surface of Pre-stressed Crack,Specimen S06ROOI045 16

Figure 22. SEM Image ofpitted Area on Outer Surface of Sample S06R001024 17

Figure 23. SEM Image ofPiLted Area Near Crevice Between C-Ring and Bolt Head onSample S06ROOI027 17

Figure 24. SRM Image of Pitted Area from Rnd of Bolt on Sample S06ROOI028 " 18

Figure 25. SliM Image of Pitted Area on Base of Sample S06ROOI042 18

Figure 26. SEM Image ofPitted Are. on Sample S06ROOI 045 19

Figure 27. Bullet Sample S06ROOI023 20

List of Tables

Table 1. Tank 241-AN-I07 Electrochemical Noise COLlpon Identification 2

Table 2. Weight Loss during Ammonium Citrate Cleaning , 11

Error! No table of figures entries found,

II

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I. SUMMARY

Tank: Farms Operations removed an electrochemical noise probe from Tank 241-AN-l 07(AN-1 07) on August 10,2006. In the field, the probe was cut into four sections, wrapped, andplaced 1n a 55-gallon drum. This drum was delivered to the 222-8 Laboratory onAugust t 1, 2006. The 222-S Laboratory unpack-aged the sections of the AN-tO? electrochemicalnoise probe and examined the material for evidence of corrosion.

Each of the four sections contained three C-ring and three bullet specimens. Eight of these24 specimens were removed and cleaned and examined to determine the extent of surfacecorrosion. The specimens were examined for pitting corrosion, crevice corrosion, and stresscorrosion cracking. Macrophotography, optical microscopy (OM), and scanning electronmicroscopy (SEM) were used to document the disassembly process and to determine the extentof corrosion on each oftbese eight specimens.

No evidence of stress corrosion cracking was found in the stressed C-ring specimens. Minorpitting was evident on some surfaces. Crevice corrosion was the dominant type of corrosionobserved.

Crevice corrosion, as a result of crevices created by poor probe design, was found at the top ofthe C-rings (where the threaded bolt met the C-ring), at the base of the C-ring (where the baitcontacted the C-ring), and beneath the C-Ting and bullet specimens, where vapors and liquidspenetrated behind the O-ring seals and caused crevice corrosion between the detector elementsand the O-rings. Pitting corrosion was found in isolated patches on the surfaces of some of theC-rings and bullets. Both crevice and pitting corrosion were more noticeable on the specimensthat had been suspended -in the vapor space of the tank (section I), but were also present on someof the other specimens recovered from the sections submerged in the waste.

Cleaned, cut, and polished sections revealed that pitting was not very well developed in thecorroded areas. Pit depths from cross-section specimens were always less than 100 j.lm.Polished and/or freeze-fractured surfaces of the stressed C-rings showed no evidence for stresscorrosion cracking.

2. lNTRODUCTlON

This report describes the final results of the disassembly and examination of electrochemicalnoise probe specimens removed from AN-I 07 on August 10, 2006. Preparation and analysis ofthese detectors were conducted at the 222-S Laboratory using internal letter 7S110·GAC-06--079Reissue, ''Transmit the Test Procedure for the Examination ofElectrochemical Noise ProbeSpecimens to be Removed from Tank 241-AN-1 07, August 2006" (7SIlO-GAC-06-079Reissue). The original laboratory test procedure was revised to address radiation dose issues thatwere discovered during the breakdown ofthe sample drum.

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The specimens were delivered to lhe 222-8 Laboratory on August 17, 2006. as four detectorsections containing six specimens each. The locations ofthe detectors and the three C-ring andthree bullet specimens on each detector are identified in Table 1.

Table 1. Tank 241-AN-l07 Electrochemical Noise Coupon Identification.

---=~pecimen,.!l'I!c_ l-- Location Probe Section LabID Field illBullet Vapor space Detector 1 ~6ROO1023_ aBullet S06ROOI024 C-z.--Bullet S06ROO1025 YC-rin2 S06ROO1026 X

J?tressed C~ring _ I-S06ROOI027 __ W'--C-rint?: S06ROOI028 V'Bullet Supernatant Dctt=ctor 2 S06ROOI029 UBunet S06ROOI030 I-- L ------ ----Bullet S06ROO1031 SC-ring S06ROO1032 RStresst=d C-ring S06ROOI033 P'C-ri~__ 1---- -------eS06ROO 1034 _ N----Bullet Supernatant Detector 3 S06ROOI035 MBullet S06ROOI036 l'~uUet___ I-S06ROOI03L _ K---C-rin£ S06ROO1038 JStressed C-rina SOOROOI039 H'C-riM S06ROOI040 GBullet Saltcake Detector 4 S06ROOl 04 I F

- ---- 1-----~ullet ___ S06ROO1042 E'Bullet S06ROOI043 D

-

C-rin£ S06ROOI044 I-- C_----Stressed C-rins-_ S06ROOI045 B'C-rin£ SOOROOI046 A

•SpecImens recovered for deanmg and analySIS.

The specimens from Detector 1 (Figure I), from the vapor space, were recovered in a fume hoodusing padded extension tools to avoid damaging the specimens. Detector 1 was removed fromthe drum, unwrapped in a hood, and all eight specimens from the detector ann were rinsed withinhibited water and placed in a dessicator.

Disassembly of the remaining sections in the hood was not possible due to high dose ratesassociated -with the sections that had been submerged in the tank waste. These sections wereloaded into a hot cell using step-by~step instructions (7S110-GAC-06-079 Reissue) that allowedthe oversized sections to be passed through the airlock with both airlock doors open and a fiberreinforced bag taped to the outer wall of the hot cell to provide contamination control. In the hotcell. a rotary cutting tool was used to remove the metal bar covering the specimens to allow forremoval with the hot cell manipulators (Figure 2). The detectors were rinsed with tap watcr

2

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followed by inhibited water. Figure 3 through Figure 5 show the other three detector assembliesduring the hoi cell breakdown.

Fi~ure l. General View or Detector I During Oisassembl)' in Hood.

Figure 2. Removal of Cross Bar from Detector 4 in Hot Cell.

3

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Figure 3. General View of Detector 2 During Disassembl}' in Hot Cell.

Figure 4. Ceneral Vie,,,,' of Detector 3 During Disassembly in Hot Cell.

4

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Figure S. General View of Detector 4 During Disassembly in Hot Cell.

Selected C-ring and bullet specimens were retrieved from the detectors in the hot cell and thenthey were loaded out oflhe hot cell (or analysis. Photographs taken during sample breakdownarc listed in Appendix A. Many ofthe:se photos were processed through image analysis softwareto achieve color balance and to sharpen lhe imag:es.

3. SAMPLE PREPARATION ANI) ANALYSIS

The selected specimens (identified in Table 1) were photographed, cleaned, and prepared forexamination by reflected-light OM or SEM at the 222-5 Laboratory. Selected features of thespecimens were documented before and after cleaning. Representative macro and microphotographsare presented in Figure 6 through Figure 13. A11 photographs are tabulated in Appendix A. Thedigital images arc posted on the ehardoes share drive and are available on compact disk (CD).

The standard size 40-l1m grid measured approximately 10% too large under the operating conditionsorthe SEM (see Appendix A); therefore. aU measurements recorded on SEM images and anymeasurements made using the image scale bars are approximately lOO/U too large.

5•

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Fi~urc 6. l"Jierophotograph (LO times) ofSpecimcn S06R001024,Detector t Bullet, Uncleaned, Scale Bar = I mm.

6

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•

RJ'I'-Rl'T-32425, Rev_ 0

Figure 7. Macrophotograph Specimen S06ROO1027,Detector 1, Stressed C-Ring, Uncleaned.

•

c.

~.

Figure 8. Macrophotograph Specimen S06ROOI033,Detector 2, Stressed C-Ring, Uncleaned.

7

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Fl2ure 9. Macropbotograph Specimen S06ROO I036,Detector 3, Buller, Uncleaned.

Fi2U.-e lO. l\1acropboto2rnpb Specimen S06ROOl038,Detector 3, NODstrcssed C-Ring, Uncleaned.

8

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Figure II. Macrophotograpb Specimen S06ROOI039,Detector 3, Stresscd C-Rlng, Uncleaned.

-

Figu rc 12. Macrophotograph Specimcn S06ROOI 042,Detectur 4, Uncleaned.

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Figure 13. Macropbotograpb Specimen S06ROOI045,Detector 4, Stressed C-Ring, Uncleaned.

~ .Specimen preparation followed the test procedures in 7S I IO-GAC-06-079 Reissue. Cleaningwas perfonneu with single or multiple washings with hot ammonium citrate in accordance withi\STM 046--94, Standard Guide for t,'.xambwtiotl (/lui Evaluation a/Pilling Corrosion. Table 2compiles the weight loss data for the several washes necessary to achieve a minimal weightchange after the initial wash «0.1 % total weigbtloss) or belween successive washes«10.0% cumulative weight loss).

Cleaned specimens were examined by OM and SEM. Several features of note were documentedbefore any further preparation. Specimen S06ROO I028, a nonstresscd C-ring from detector 1 (inthe vapor space) showed significant corrosion where the threads orthe bolt eame through the topof the C-ring (Figure 14). After cleaning. SEM examination oftlIat region revealed that only aportion of the corrosion-covered area had significant pitting (Figure 15).

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Table 2. Welgbt Loss during Ammonium Citrate Cleaning.

Wt:lght delta % IS the weight loss [gam] ail a peTCeTltage of the total samplt: for the first cleaning. Fur successivec1~. it is the pen:enlage ~ight loss as a percentage of the cumulative .....eight 1QSl$ frtlm all cleanings.

Weight W<lg~t

before after Cum.laUnLaboratory SotutlOd Solution Weigh'

SpecJD1C.Il S~mpte SOU Soak Loss WeigbtIdenttfltadou Nllmber (grams) (gram» (grams) Cleaninf: Delta %.

] 2 3 4 5 Number 6Deteclor 1 B2@__ S06ROOl024 82.345 82.270 0.075 l 0.091-----De'<;<:lorJH2.LZL S06ROOI024 82.270 82.242 0.103 2 27.184Detector 1 B2 (Z) S06ROO1024 82.242 82.209 0.136 3 24.265__

DerectoT 1 B2 (Z) S06ROOI024 82.209 82.214 0.131 4 Q.,81L_-----------

Detector I SC ~ S06ROOI027 86.895__ J!6.683__ 0.212 1 0.243

DeU.'CtOT I SC ~ ",06ROOJ02~__86.683 86.608 0.287 2 26.132

Detector 1 SC IF) S06ROOI027 86.608 86.510 0.385 3 25.454Detector I SC(Vh- cB06ROOI027__S6.51O 86.515 0.380 4 LJ·31L_

r-~1CctOTI RC2 (V) S06R001028 87.427 87.197 0.230 ----[- 0.263-----Detector I RC2 IV) S06ROOI028 87.\97 87.072 0355 2 35.211Detectur 1 RC2 (V)

- ---- -S06ROOI028 87.072 87.019 0.408 3 12.990

Delector I RC2 {YL S06ROOI0281-----

86.946 0.481 4 t5.17787.019

rP"lector 1~C."21Yj CS06ROOI028----

86.946 86.943 0.484 5 0.620---------

Delector 2 sC(pj- S06ROOJOJJ 86.684 86.661 0.023 I 0.027-- --- -- --

Delector 3 B2 IL\ S06ROOI036 82.512 82.511 0.001 I 0.001-- --_.-

0.017 --De'ector 3 Sc:lH~_. ~06ROO1039 88.426 88.411 Om5 1--f-=----- ---

Delector 4 H2 (E) S06ROOI042 82.260 82.247 0.013 1 0.016- ---- :- '87.483 O.OIS--Detector 4 SC (Bl S06ROOlO35 87.499 0.016 1-- --

--- -Cenlmnl! Post .- Blank 47.798 47.770 0.028 1 0.059-Centering Poo..l.._ Blank 47.770 47.766 0.032 2 12.5

• -

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"'igurc 14. Macrophotograph of the Top of Vapor Spac.c1'\'oDstressed C-Ring S06ROOI028.

Figure IS. SEM Microphotograph orthe Top ofVapor Space Nonstressed C-Ring S06ROOI028.

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RI'P-RI'T-32425, Rcv. 0

Following cleaning. Ihe selected specimens were prepared for examinaljon in several ways.Cross sections of tile specimens were slieed using a low-speed saw with a diamond-impregnatedblade. The stressed C-rings were prepared for examination of the stress-cracked sl..'Ction byslicing a thin section of the C-ring. The thin (about 4-mm thick) portion or the slressed C-ringswas submerged in liquid nilTogen (LN2) and then struck lightly, on edge, with a mallet, tocomplete the fr..acturc into two pieces. These two pieces were mounted side-hy-side for OM andSEM examination of the fractured surfaces. Figure 16 is 3Jl SEM photomicrograph ofone of thefractured surfaces from S06ROOI027, the vapor space stressed C-ring. All measurements inFigure 16 start at the top where the v-notch ends and the pre-crack begins. Hie entire length ofthe pre-crack afier recovery and preparation is 3720 /lm. The region from 3720 p.rn to 5230 Ilmis the LN2 fractured surtace. Figure 17 through Figure 19 show example SEMphotomicrographs of the three stressed C-ting LN2 fractured surfaces. In these three figures. thetight-hand image is a magnified view of the area in the yellow box ofthe left hand image and theLN2 fractured portion is toward the bottom of the images. These right-hand images are all takenfrom the region where the pre-eraek ends and the L:"l2 fracture surface begins.

Figure 16. SEM Photomicrograph of the Face of Pre-stressed Crack,Specimen SlMROOI027.

(V-notch is toward the top and the LN2 cracked area is toward bottom.)

13

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Figure 17. SF.1\1 Photomicrograph of the Face of Pre-stressed Crack,Specimen S06ROO I027.

(lmage to the right is a blow~up of the area within the box in the len-haml image.)

Figure 18. St.:M Photomicrograph of the Face of Pre-stressed Crack,Specimen S06ROOIOJJ.

(image to the tight is a blow-up of the area withilllhe box illlhc lell-hand image.)

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Figure 19. SEM Photomier()grapb of tbe Face of Prc-stressed Crack,Specimen S06ROOI045.

(image to the right is a blow-up of the area within the box in the left-hand image.)

"I'hc larger cut scclions of two oflhe pre-strcss':d C-rings were polished wi lh successively finerpolishing grils wilh a IO-llm fmal polisb. The cul and polished surfaces were then etched with3% nitric acid in methanol (ASTM E-407-99, Stwldard Practice for Microetchillg Metals alldAlloys). The polished anel etched surfaces of the pre-cracks were again examined by OM andSEM. figure 20 and rigure 21 show SEM photomicrographs of the polished and etched surfacesat the tips of each of the pre-cracks in the two slressed C-rings that were examincd.

Fillal1y. n number of specimens were examined for corroslon pit size, dcplh, and sbape. Thesesamples were prepared by CUlling cross~scctions using the low-speed saw and polishing thesurfaces to 600 grit. The resultillg specimens wcre examined by OM and SEM. Representativeimages o[lhe largcsl pits observed io these samples are shown in foigure 22 through foigure 26.

15

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Figure 20. SEM Photomicrograph of the Polished and Etcbed Surface of Pre-stressedCrack, Specimen S06ROOI027.

(Image to tbe right is a blow-up of the area wilhin the box in the Icfl-ba.nd image.)

Figure 21. SEM Photomicrograpb of the Polished and Etched Surface of Pre-stressedCrack, Specimen S06ROOI04S.

(lmage to the right is a blow-up oflhe area within the box in the len-hand image.)

16

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Figure 22. SEJ\1 Image of Pitted Area on Outcr Surfacc of Sample S06ROOI024.

Figure 23. SF.M Image of Pitted Arca Near Crevice Betweeu C-Ring and Bolt Head onSample S06ROOI027.

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Figure 24. SEM Image of Pitted Area from Eod of Bolt on Sample S06ROOI028.

Figure 25. SEM Image of Pittcd Arca 00 Basc of Sample S06ROOI042.

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Figure 26. SEM Image Dr Pitted Area on Sample S06ROOI MS.

•

4. DISCUSSION

The AN-l 07 electrochemical noise probe was removed fTom AN-I 07 on August 10, 2006, cutinto fOllr sections. wmpped. placed in a 55-gallon drum and delivered to the 222-5 Laboratory Oil

August 17,2006. The 222-5 Laboratory unpacknged the sections of the AN·l 07 electrochemicalnoise probe and examined the material for evidence of corrosion.

The electrochemical noise probe consisted of four detector sections, each containing three C-ringspecimens and three bullets. Detector I was deployed in the head space or vapor space of thetank. Detector 2 and Detector 3 were submerged in the supernate liquid. Detector 4 wasimbedded in the saltcake waste. One ortbe lhrel: C-ring specimens on each detector waspre-stressed to investigate the potenlial for slress corrosion cracking in the tank waste.

Detector I was disassembled in a fwne hood and all six specimens were removed and t:xarninedduring rinsing and lfansfer to the dessicator. During this process, it was notcdlhat the pre·stfCsscd C-ring S06R001027 had a noticeable crack extending from the tip of the v·notch(Figure 7). In addition. significant patches ofcolTOsion were secn on scveral of the otherspecimens on detector I. Of note were a patch of surface corrosion on bullets S06ROOI 024 andS06ROO1025 (Figure I and Figure 6) and a large patch of corrosion on the top ofnonslTessedeRring S06ROOI 028 where the bolt extended through the C-ring (Figure 14). It was also notedlhat all of the specimens removed from detector t had significant corrosion on the underside,beneath, and behind the region that was protected by the O-ring (Figure 27).

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Fi~urc 27. Bullet Sample S06ROOI023. (BoLlom region, behind O·ring.)

During discussions with Glenn Edgemon of ARES Corporation aboul observations made duringthe Detector 1 breakdown, it was learned that the stressed C-rings were not stressed 10 just belowthe point of cracking, as spccificd in ASTM G38-01, Standard Practice for Making and UsingC·Rillg Stress Corrosion Test Specimens. Ralher, they were stressed beyond failure 10 "pre·crack" the stressed C-rings. Therefore, the observation of cracks in the v-notch of specimenS06ROOl027 was to be expected. Unfortunately, no pictures of tile pre-cracked specimens wereavailable. Therefore, the extent to which cracking occurred in the lank becomes more difficult todetennine and the physical evidence ITom analysis oflhe C-rings provides the only basis, olherthan analysis of the electrochemical signals, for detem1ining ifstress corrosion cracking hasoccurred. Edgemon also indicated (personal communication) that the observation of corrosionproduct benealh the Detector 1 specimens and behind the O~rings was 110t unexpected since theelectrical signal from Detector I failed early during deployment.

Disasscmbly of lhc remaining dctectors re"caled that the other t1uce prc~stressed C~rillgs werealso cracked in the "~llo1ch, as was now expected. It also showed that the submerged detectorsection specimens wcre coatcd with signilicantly less corrosion product. Corrosion apparentlyproceeded al a greater mte in the vapor ::''Pact: oflhe tank.

During d.isassembly ofall four detectors. the sections were photographed and eight specimenswere selected for microscopic evaluation of corrosion. These were the four pre~stressed C-rings(all of which showed evidence ofpre-cracking) and lour additional samples (see Table 1). Theadditional samples were. in general, selecled because they showed some evidence for surfacepining or crcvice corrosion.

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The cleaning of these specimens in accordance with ASTM G1-90, Standard Practice forPreparing, Cleaning, and Evaluating Corrosion Test Specimens, serves two purposes. Itremoves corrosion to expose the metal surface to examine for the extent and type of corrosiveattack. and it provides weight loss data for the estimation of corrosion Tates. None ofthe C-ringsor bullet specimens were preweighed prior to deployment in the tank; therefore, there is no basisfor conversion ofweight loss data from specimen preparation to a corrosion rate. The dataobtained during cleaning confirmed more corrosion product had built up on the vapor spacespecimens than on the specimens from the other three detectors (Table 2). Weight losses duringcleaning fbrthe three specimens in the vapor space were 0.131 g, 0.380 g, and 0.484 g. None ofthe weight losses during cleaning for the other five specimens exceeded 0.03 g.

The specimens were cxamined for pitting corrosion, crevice corrosion, and stress corrosioncracking, as discussed in the ASM Handbook, Corrosion, Volume 13. Macrophotography, OM,and SEM wcre used to document the disassembly process and to detennine the extent ofcorrosion on eaeh of the eight specimens.

No evidence of stress corrosion cracking was found in the stressed C-ring specimens. Theseexamination results were reported in internallcUer 7S110-GAC-06-087. ~'Resu1ts of theExamination of Electrochemical Noise Probe Specimens Removed from Tank 241-AN-107A"gusl 10,2006" (7S110-GAC-06-087). Minorpilting was evident on some s\!ffaces. Crevicecorrosion was the dominant t)'pe ofcorrosion observed.

Crevice corrosion was found at the top of the C-rings (where the threaded bolt met the C"ring), atthe base of the C-ring (where the bolt contacted the C-ring), and beneath the C-ring and bulletspecimens, where vapors and liquids penetrated behind the O-ring seals and caused crevicecorrosion between the detector elements and the O-rings. Pitting corrosion was found in Isolatedpatches on the surfaces of some of the C-rings and bullets. Both crevice WId pitting corrosionwere more noticeable on the specimens that had been suspended in the vapor space of the tank(Detector I) but evidence of crevice and pitting corrosion was also present on some of the otherspecimens recovered from the detectors submerged in the waste.

Cleaned, cut, and polished sections revealed that pitting was not very well developed in thccorroded areas. Pit depths from the cross-sectioned specimens were always less than 100 )Jm.

Polished and/or freeze-fractured surfaces of the stressed C-rings showed no evidence of stresscorrosion cracking.

5. REFERENCES

7S110-GAC-06-079 Reissue, 2006, "Transmit the Test Procedure for the Examination ofElectrochemical Noise Probe Specimens to bc Removed from Tank 241-AN-I07, August2006" (intern.lleller from G. A. Cooke to K. G. Carothers, September 20), CH2M HILLHanford Group, Inc., Richland, Washington.

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7S1l0-GAC-06-087, 2006, "Results of the Examination of Electrochemical Noise ProbeSpecimens Removed from Tank 241-AN-107 August 10,2006" (internal letter fromG. A. Cooke and J. B. Duncan to K. G. Carothers, September 27), CH2M HILL HanfordGroup, Inc., Richland, Washington.

ASM Handbook, 1987, Volume 13, Corrosion, ASM International, Materials Park, Ohio.

ASTM G I~90, 1990 (Reapproved 1999), Standard Practice for Preparing, Cleaning. andEvaluating Corrosion Test Specimens, ASTM International, West Conshohocken,Pennsylvania.

ASTM G38-01, 2001, Stalldard Practice for Making and Using C-Ring Stress-Corrosion TestSpecimens, ASTM International, West Conshohocken, Pennsylvania.

ASTM G46-94, 1994 (Reapproved 1999), Standard Guidefor Examination and Evaluation ojPitting Corrosion, ASTM International, West Conshohocken, Pennsylvania.

ASTM E-407-99, 1999, Standard Practice for Microetching Metals ami Alloys, ASTMInternational, West Conshohocken, Pennsylvania.

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APPENDIX A

IMAGE NAMES AND LOCATIONS FROM THE EXAMINATION OF 241-AN·I07ELECTROCHEMICAL NOISE PROBE SPECIMENS

NOTE: Images located on the Hantord Chardocs share drive in the directory;AN107 Corrosion ProbelFinal Report

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Chardocs:\AN107 Corrosion Probe\Final Report \Detector Breakdowo\

Subdirectory Detector l\September Breakdowo\ANI07 Segment I 028.jpgAi'l107 Se!\lllent 1 029.jpgANI07 Segment 1 030.jpgANI07 Segment 1 031.jpgANI07 Segment 1 032.jpgANI 07 Segment I 033.jpgANI07 Segmentl 034.jpgANI07 Segment 1 035.jpgANI07 Segment 1 036.jpgAi'l107 Segment I 037.jpgANI07 Segment IOJ8.jpgANI07 Segment 1039.jpgANI07 Segment 1 040.jpgANI07 Segmentl 041.jpgANI07 Segment 1 042.jpgANI07 Segment] 043.jpgANI07 Segment] 044.jpgANI07 Segment 1 045.jpgANI07 Segment 1 046.jpgANI07 Segment] 047.jpgANI07 Segment] 048.jpgANI07 Segment] 049.jpgANI07 Segment] 050.jpgAN]07 Segment I 051.jpgANl07 Segment I 052.jpgANl07 Segment] 053.jpgANto7 Segment I 054.jpg

SUbdirectory Detector 2\Decernber Breakdown\Seetion2B tHC l.JPGSeetion2B1HC2.JPGSeetion2B2HCl.JPGSeetion2B2HC2.JPGSectio02B3HCUPGSection2B3HC2,JPGSeetio02CIHC1.JPGSectio02C I HC2.JPGSectio02C3HC I.JPGSection2C3HC2.JPGTree2·2,JPGTree2-3.JPGTrce2-4.JPG

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Tree2-5.JPGTree2-6.JPGTree2-7.JPG

Subdirectory Detector 2\September Breakdowo\Processed

Segm<:nt 2 Sample tag.jpgSegm<:nt 2-1.jpg

RowAN 107 Segment 3 and 4 006.jpgANI07 Segment 3 and 4 007.jpgAN 107 Segment 3 and 4 OOS.jpgAN 107 Segment 3 and 4 009.jpgANI07 Segment 3 and 4 OIO.jpgANI07 Segment 3 and 4 Oll.jpgANI07 Segment 3 and 4 012.jpgANI07 Segment 3 and 4 013.jpgANI07 Segment 3 and 4 014.jpgAN 107 Segment 3 and 4 015.jpgAN 107 Segment 3 and 4 016.jpg

Subdirectory Detector 3\Det;ember Breakdown\Seclion3BIHCI.JPGSection3BITIC2JPGSection3B3l-IC3JPGSection3B3HC4JPGSeclion3B3HCSJPGSectinn3C3HC UPOSection3C3HC2.JPGTree3- UPGTree3-2.JPGTree3-3,JPGTreeJ-4.JPGTree3-5.JPGTree3-6.JPGTree3-7.JPGTree3-8.JPGTree3-9.JPG

Sabdlrectory Detector 3\September BreakdowD\ANI07 Segment 3 and 4023.jpgANI07 Segment 3 and 4024.jpgAN 107 Segment 3 and 4 025.jpgAN 107 Segment 3 and 4 026.jpgANI07 Segmcol3 and 4 027.jpgANI07 Segment 3 and" 028.jpg

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AN 107 Segment 3 and 4 029.jpgANI07 Segment 3 and 4 030.jpgANI07 Segment 3 and 4 031.jpgANI07 Segment 3 and 4 032.jpgAN 107 Segment 3 and 4 033.jpgAN 107 Segment 3 and 4 034.jpgAN 107 Segment 3 and 4 035.jpgAN I07 Segment 3 and 4 036.jpgANI07 Segment 3 and 4 037.jpgAN 107 Segmenl 3 and 4 038.jpgAN 107 Segment 3 and 4 039.jpgAN 107 Segment 3 and 4 040.jpgAN 107 Segment 3 and 4 04l.jpgAN I07 Segment 3 and 4 042.jpgANI07 Segment 3 and 4 043.jpgAN I07 Segment 3 and 4 044.jpgANI07 Segment 3 and 4 045.jpgAN107 Segment 3 and 4046.jpgANI07 Segment 3 and 4 047.jpgAN 107 Segment 3 and 4 048.jpgA 107 Segment 3 and 4 049.jpgANI07 Segment 3 and 4 050.jpgAN I07 Segment 3 and 4 051.jpgANI 07 Segment 3 and 4 052.jpgANI 07 Segment 3 and 4 053.jpgAN107 Segment 3 and 4 054.jpgAN107 Segment 3 and 4 055.jpgANI07 Segment 3 and 4 056.jpgANI07 Segment 3 and 4 057.jpgANI07 Segment 3 and 4 058.jpgANI07 Segment 3 and 4 059.jpgANI07 Segment 3 and 4 060.jpgAN107 Segment 3 and 4 06l.jpgAN107 Segment 3 and 4 062.jpg

SUbdirectory Detector 4\December Breakdown\Section4BIHCl.lPGSection4B IHC2.JPGSectio04B3HCl.JPGSection4B3HC2.JPGSectinn4B3HC3 JPGSection4CIHC2.JPGSection4CI HC3.JPGSection4C IHC4.JPGSeetion4CI HC5.JPGSection4ClHC6.JPG

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Sect;on4ClHC7.lPGSeet;on4C3HC I.!PGSection4C3HC2.JPGScction4C3HC3.lPGSeetion4C3HC4.lPGTree4-I.1PGTree4-2.JPGTree4-3.!PGTree4-4.JPGTree4-5.JPGTree4-6.lPG

SUbdirectory Detector 4\September Breakdown\AN107 Segment 3 and 4 OOl.jpgAN107 Segment 3 and 4 002.jpgAN107 Segment 3 and 4 003.jpgANl07 Segment 3 and 4 004.jpgAN107 Segment 3 and 4005.jpgAN 107 Segment 3 and 4063.jpgANI07 Segment 3 and 4 OM.jpgA 107 Segment 3 and 4 065.jpgAN107 Segment 3 and 4 066.jpgANI07 Segment 3 and 4 067.jpgANl07 Segment 3 and 4 068.jpgAN107 Segment 3 and 4 069.jpgAl\/107 Segment 3 and 4 070.jpgAN107 Segment 3 and 407l.jpgAN107 Segment 3 and 4 on.jpgAN107 Segment 3 and 4 073.jpgAN I 07 Segment 3 and 4 074.jpgAN107 Segment 3 and 4 075.jpgAN107 Segment 3 and 4 076.jpgAN I 07 Segment J and 4 077.jpgAN 107 Segment J and 4 078.jpgAN I07 Segment 3 and 4 079.jpg

Chardocs:\AN107 Corrosion Probe\Flnal Report \Sample Analysis\Macrophotography\

Subdirectory' S06R001027AAN I07 Segment 1 002AN I07 Segment I 003ANI07 Segment I 005ANI07 Segment I 006AN 107 Segment I 007AN 107 Segment I 008

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Subdirectory S06Roo I0278ANl07 Segment I base.jpgAN107 Segment I CoRing side A.jpgANl07 Segment I CoRing side B.jpgAN 107 Segment I top of Coring eraek.jpg

Subdirectory S06ROOI033AN107 Segment 2 Stressed CoRing noteh.jpgA 107 Segment 2 Stressed CoRing notch 2.jpgANI07 Segment 2 Stressed CoRing side A.jpgAN I 07 Segment 2 Stressed CoRing bottom.jpdAN I07 Segmenl 2 Stressed CoRing side B.jpg

Subdirectory S06RooI036AN I07 Segment 3 Bullet boLlom.jpgANI 07 Segment 3 Bullet.jpg

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Subdirectory S06RooI039AN I07 Segment 3 Stressed CoRing bottom.jpgANI07 Segment J Stressed CoRing side Al.jpgAN I 07 Segment 3 Stressed CoRing side A.jpgANI07 Segment J Sttessed CoRing side RjpgAN I 07 Segment J Stressed CoRing notch I.jpgAN 107 Segment J Stressed CoRing noteb 2.jpgANJ07 Segment J Stressed CoRing notch 3.jpg

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Subdireetory 806RooI045ANI07 Segmenl4 Stressed CoRing bottom.jpgANI07 Segment 4 Stressed CoRing side A.jpgANI07 Segmeut 4 Stressed C-Ring side RjpgANI07 Segment 4 Stressed C-Ring noteh.jpg

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Ch.ardo<:s:\AN I07 Corrosion Probe\Final Report \Sample Anaty.islMlcropbolograpbyl

Subdirectory BlanklCleanoolSEMBlankCtean- Ia.jpgBlankC!ean-1 bjpgBlankClean.2a.jpgBlankClean.2bjpgBlankClean·3a.jpgBlankCJcan·3b.jpgBlankClcan-4a.jpgBlankClcan-4bjpgBlankClcan·5a.jpgBlallkClcan·5b.jpgBlankClean-6a.jpgBlallkCle.lI-6bjpg

Subdirectory Blank\Uncleaned\OpticalAN 107Blank·IOXI.lPGANI07Btank- IOX2.JPGANt07Blank-20XI.lPGAN107Blank·20X2.JPGAN107Bhmk·40XI.lPG

Subdirectory Blank\Uncleaned\SEMAN107Blank·Ol..JPGANI07Blank.Olb.JPGAN107Blank·02u.JPGANI07Blank·02b.JPGANI07BI.nk·03..JPGANI07Blank·03b.JPGAN I07Blank·04• .JPGANI07BJank·04b.JPGAN 107Blank.05.JPG

Subdirectory S06ROOI014IPIttiugiOpticaiS06ROOI 024Bullel-30X.,.JPGS06ROOI024Bullet-63Xa.JPGS06ROOI024Bullet-63Xb.JPGS06ROO I024Bullel-63Xc.JPGS06ROOI024Bullet-63Xd.JPGS06ROOI024Bullel-63Xe.JPGS06ROOI024Bullet-63Xf.JPGS06ROOI024Bullet-63Xg.JPGS06ROO1024Bullet-63Xb.JPGS06ROOI 024Bullet·b3Xi.JPG

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Subdirectory S06R001024IPittingISEMS06ROOI024Bu1let-l.jpgS06ROOI 024Bu1lel-1 O.jpgS06ROOI 024Bu1lel-l Oa.jpgS06ROOI024Bullel-11.jpgS06ROO1024Bu1let-11 a.jpgS06R001024Bullet-12.jpgS06R001024Bu1let-12a.jpgS06R001024Bu1let-13.jpgS06ROOI024Bu1lel-13a.jpgS06R001024Bullet-14.jpgS06ROO 1024Bullet-14a.jpgS06ROOI024Bullet-\ 5.jpgS06R001024Bullet-15a.jpgS06ROOI 024Bullet-l a.jpgS06R001024Bullet-2.jpgS06ROOI 024Bullet-3 .jpgS06R001024Bullet-3a.jpgS06ROO1 024Bullet-4.jpgS06ROO1024Bu1let-4a.jpgS06ROOI024Bullet-5.jpgS06ROO1024Bullet-5a.jpgS06ROO1024Bullet-6.jpgS06ROO1024Bullet-6a.jpgS06ROO1024Bu1let-7.jpgS06ROOI024Bullet-7a.jpgS06ROO1024Bu1let-8.jpgS06ROOI024Bullet-8a.jpgS06ROO1024Bullet-9.jpgS06ROOI024Bullel-9a.jpg

Subdirectory S06R001024lUncleanedlOptlca'S06ROOI024-10Xl.JPGS06ROOI024-1OX2.JPGS06ROOI024-10X3.JPGS06ROO I024-1 OX4.JPGS06ROO1024-1 OX5.JPGS06ROOI024-1 OX6.JPG

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SO<iROOI024-20XI.JPGS06ROO1024-20X2.JPGS06ROOI024-20X3.JPGS06ROOI024-20X4.JPG

SUbdirectory S06ROOI024IUucle.uedISEMS06ROO1024-1a.JPGS06ROO1024-lb.JPGS06ROOI024-1c.JPGS06ROO1024-2aJPGS06ROOI024-2b.JPGS06ROOI024-2eJPG

Subdirectory: S06ROOI0271Cle.uedlOpticalS06ROOI027c-IOXIJPGS06ROOI027e-I0X2.,PGS06R001027c-20Xl.JPGS06ROOI027c-20X2.JPGS06ROOI027c-20JO.JPGS06ROOI027c-20X4.JPGS06R001027e-20X5.lPGS06ROOI027e-40Xl.lPGS06ROOI027c-40X2.JPGS06ROOI027C-40X3.JPGS06R001027C-63XI.lPGS06ROO1027C-63X2.lPGS06ROO1027C-63X3.JPGS06R001027C-63X4.JPG

Subdirectory S06ROOI0271Cle.uedISEMS06ROO1027e-l 0 La.JPGS06ROOI 027e-IO IbJPGS06ROOI 027e-l 02a.JPGS06ROOI 027e-1 02b.JPGS06ROO I027e-1 02e.JPGS06ROO I027e-1 03a.JPGS06ROO1027c-I03b.JPGSO<iROO I027e-1 04a.JPGSO<iROO1027e-I04b.JPGS06ROO1027e-I05a.JPGSO<iROO1027c-l05b.JPGS06ROO 1027e-1O<ia.JPGS06ROO 1027e-l O<ib.JPGS06R001027e-I07a.JPGS06ROOI 027e-I07bJPGS06ROOI027e-I08a.JPG

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S06ROOI027c-108b.J1'GS06ROOI027c-I08cJ1'GS06ROOI027c-I09aJ1'GS06ROOI027c-109bJ1'GS06ROOlO27c-ll0aJ1'GS06ROOlO27c-II0bJ1'GS06ROOI027c-Illa.J1'OS06ROOI027c-lllb.J1'GS06ROO1027c-112aJ1'GS06ROO1027c-112b.JPG

Subdirectory S06ROOI0271EtcbedISEMS06R001027cpe-la.jpgS06R001027cpe-lb.jpgS06ROOI027cpe-2a.jpgS06ROOI027cpe-2b.jpgS06R001027cpe-3a.jpgS06R001027cpe-3b.jpgS06ROOI027cpe-4a.jpgS06R001027cpe-4b.jpgS06ROO l027cpe-5a.jpgS06ROOI027cpe-5b.jpgS06R001027cpe-6a.jpgS06ROOI027cpe-6b.jpgS06ROO1027cpe-7a.jpgS06ROO1027cpe-7b.jpgS06R001027cpe-8a.jpgS06ROO1027cpe-8b.jpgS06ROOI027cpe-9a.jpgS06ROOI027cpe-9b.jpgS06ROOI027cpe-IOa.jpgS06ROO l027cpe-lOb.jpgS06ROO l027cpe-lla.jpgS06ROOI027cpe-llb.jpgS06ROO I027cpe-12a.jpgS06ROO I 027cpe-12b.jpgS06ROO I 027cpe-13a.jpgS06ROO I 027cpe-13b.jpgS06ROO1027cpe-14a.jpgS06ROOI027cpe-14b.jpgS06ROOI027cpe-15a.jpgS06ROOI027cpe-15b.jpgS06ROOI027cpe-16a.jpgS06ROOI027cpe-16b.jpgS06ROOI027cpe-17ajpgS06ROOI027cpc-17b.jpg

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Subdirectory S06ROOI027\Fractured\OpticalS06ROO1027cca-15XI.JPGS06ROOI027cca-15X2.JPGS06ROO1027cca-40Xl.JPGS06ROOI027ccb-15X1JPGS06ROOI027ccb-15X2.JPG

Subdirectory S06R001027\FracluredISEMS06ROO 1027=-1 a.IPGS06ROO 1027cca-1 b.JPGS06ROO 1027cca-2a.lPGS06ROOI027cca-2b.lPGS06R001027cca-3a.lPGS06R001027cca-3b.JPGS06R001027cca-4a.JPG

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Subdirectory S06RllOl 027\PittiuglOpticalS06ROO I027Base-l OXa.JPGS06ROO I027Base-30Xa.JPGS06ROO I027Base-63Xa.JPGS06ROO I027Base-63Xb.JPGS06ROO I027Base-63 Xc.JPGS06ROO \027Crevice-63XaJPGS06ROO I027Crevice-63Xb.JPGS06ROO I027Crevice-63Xc.JPG

Subdirectory S06R001027\PlttingISEMS06ROO1027Base-l.jJlgS06ROOI027Base-la.jpgS06ROOI027Base-2.jpgS06ROO \027Base-2a.jpgS06ROO I027Base-3.jpgS06ROO I027Base-3a.jpgS06R001027Crevice-l.jpgS06R001027Crevice-laJpgS06ROO I027Crevice-2.jpgS06ROO I027Crevice-2a.jpgS06ROO1027Crevice-3.jpgS06R001027Crevice-3a.jpg

Subdirectory S06R001027\PolisbedIOpticalS06R001027cp-20X1JPGS06ROOI027cp-20X2JPGS06ROO1027cp-20X3.JPGS06ROOI 027cp-40XI.JPG

Subdirectory S06R001027\Polisbed\sEMS06ROO I027cp-l a.JPGS06ROOI027cp-lb.JPGS06ROO1027cp-2.JPGS06ROOI027cp-2bJPG

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Subdirectory S06ROOl027\UucleanedIOpdcal\Side AS06R001027-10X1.JPGS06ROOI 027-1 OX2.JPGS06ROO1027-lOX3.JPGS06ROO1027-20Xl.JPGS06ROOI027-63Xl.JPGS06R001027-63X2.JPG

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Subdirectory S06ROOI0271UuclcauedIOptica\ITopS06ROOI027-IOX4.JPGS06ROOI027-IOX5.JPG

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DISTRIBUTION SHEET

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Project TitleIWorit OrderDate MaJ:"ch 7007

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A-6000-135 (10191)

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Corrosion on Sections ofCorrosion Probe Removed from Tank .../67531/metadc... · Figure 6. Microphotograph (10 times) ofSpecimen S06ROO1024. Detector I Bullet, Uncleaned, Scale Bar=