“PAINT FILM DURABILITY TEST AND UNPAINTED · PDF file“PAINT FILM DURABILITY TEST AND UNPAINTED STEEL SHEET CORROSION TEST” April 24, 2012 JFE Techno-Research Corporation Solutions

Messrs. JFE Engineering Corporation

Report No. W1100800-2/W1101118-2

（Total pages including cover: 33）

“PAINT FILM DURABILITY TEST AND

UNPAINTED STEEL SHEET CORROSION

TEST”

April 24, 2012

JFE Techno-Research Corporation

Solutions Division (Kawasaki)

Masaki Omura, Director

1-1 Minamiwatarida-cho, Kawasaki-ku, Kawasaki 210-0855 Japan

TEL 044-322-6205 FAX 044-322-6528

1

Requested by

JFE Engineering Corporation (as a sponsor)

TESTING FACILITY

〒230-0045

JFE Techno-Research Corporation

Solutions Division (Kawasaki), Corrosion & Corrosion Protection Dept. 1-1 Minamiwatarida-cho, Kawasaki-ku, Kawasaki 230-0045 Japan

Testing Implementation Organization

Name Position Role

Takumi Ujiro (Dr. Eng.) General Manager, Corrosion

& Corrosion Protection Dept.

Overall responsibility for

implementation of testing

Yoshiaki Fujiwara Senior Staff Quality Auditor

Mitsunori Nakamura Leader Responsible for

implementation of testing

Yuji Hata In charge of testing

Takashi Yanagisawa In charge of testing

Tsukasa Nishio In charge of testing

2

－Contents－

1. Purpose…………………………………………………………………………………………1

2. Corrosion Test Method…………………………………………………………………………1

3. Evaluation Test Method…………………………………………………………………………4

4. Test Results……………………………………………………………………………………7

4.1 Carbon Steel Test Piece………………………………………………………………………7

4.2 Plated Steel Test Piece…………………………………………………………………………7

4.3 Painted Test Piece………………………………………………………………………………7

5. Summary…………………………………………………………………………………8

W1100800-2/W1101118-2

1

1. Purpose

In response to regulations concerning the discharge control of ballast water, disinfection of

ballast water by Venturi mixing and addition of aqueous solution of NEO-CHLOR MARINETM

(Its major component is sodium dichloroisocyanurate dihydrate) is being studied. As

NEO-CHLOR MARINETM is a powerful oxidant, the effect of this chemical on corrosion of

unpainted parts in ballast tanks and the possibility of early deterioration of the painted film in

ballast tanks is a concern. Therefore, laboratory tests were performed in order to determine the

effects of NEO-CHLOR MARINETM on unpainted steel sheets (carbon steel sheet and

Zn-coated steel sheet) and painted steel sheets. In the present investigation, tests were

performed using granular NEO-CHLOR MARINETM (contains 55% available chlorine

concentration). This report summarizes the results of an evaluation after a corrosion test of 6

months (9 cycles).

2. Corrosion Test Method

Corrosion tests were performed in accordance with “5.1 Recommendation for corrosion

testing” in the MARINE ENVIRONMENT PROTECTION COMMITTEE Report, “MEPC

59/2/16 Report of eighth meeting of the GESAMP-Ballast Water Working Group” of the IMO

(International Maritime Organization). The standards followed in the painting specifications of

painted materials, corrosion test, and evaluation methods are summarized in Table 1.

Table 1 Corrosion test standards

Item Standard

Corrosion test – General conditions IMO MEPC 59/2/16,

“5.1 Recommendation for corrosion testing”

Painting specification of painted test pieces

Resolution MSC,

215 (82) IMO Paint performance standard

MSC 82/24/Add. 1 ANNEX 1, 4.4

Corrosion test (immersion test)

Test reproducing ballast tank environment MSC 82/24/Add.1 APPENDIX 1, 1.5

Evaluation of unpainted specimen

(carbon steel) MEPC 59/2/16, 5.1.7

Evaluation of unpainted specimen (Zn-coated)

Peeling at scribed area ISO4628-8

General MEPC 59/2/16, 5.1.8

Adhesion ISO4624 (JIS K5600-5-7)

Blistering ISO4628-2 (JIS K5600-8-2)

Rust ISO4628-3 (JIS K5600-8-3)

Cracking ISO4628-4 (JIS K5600-8-4)

Peeling ISO4628-5 (JIS K5600-8-5)

Painted material

Evaluation of paint

coating properties

Peeling around

scribed part ISO4628-8

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2

（1）Test pieces and dimensions

The specifications of the test pieces are as follows. The painting specification of the painted

test pieces is shown in Table 1. The unpainted test pieces (carbon steel and Zn-coated test

pieces) were prepared by this company, and the painted test pieces (including cutting and

sealing of the back side and edges) were provided by the client.

（A） Carbon steel test pieces

・ Material: Carbon steel （SS400）

・ Dimensions: 25×50×3.2t mm

・ No. of test cycles: n = 2 under each set of test conditions

（B） Zn-coated test pieces

・ Material: Carbon steel （SPHC）


・ Pretreatment: Pickling → Removal of black scale → Degreasing → Galvanizing

・ Hot dip galvanizing: 450 to 550g/m2 (Z45 equivalent)


（C） Painted test pieces

・ Base material: Carbon steel （SS400）


・ Painting specification: Shown in Table 2. Average film thickness: 320 μm (excluding

primer)

・ Painting method: Spray


Table 2 Painting specification

Paint type Painting specification Maker

Substrate treatment Shot blast ISO Sa2.5

Surface roughness 30-75 μm －

Inorganic zinc shop primer

CERABOND 2000 15 μm Chugoku Marine Paints, Ltd.

Mod

ifie

d ep

oxy

Painting

NOVA2000 160 μm×2 Chugoku Marine Paints, Ltd.

Substrate treatment Shot blast ISO Sa2.5

Surface roughness 30-75 μm －

Inorganic zinc shop primer

CERABOND 2000 15 μm Chugoku Marine Paints, Ltd.

Pur

e ep

oxy

Painting

BANNOH 1500 160 μm×2 Chugoku Marine Paints, Ltd.

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3

（2）Test temperature

a. 23±5°C (Room temperature. Controlled by air conditioner in test room)

b. 35±3°C (Water temperature controlled by temperature regulator)

（3） Test solution

a. Natural seawater (purchased seawater taken from waters around Ogasawara)

b. Natural seawater + NEO-CHLOR MARINETM (concentration: 10 ppm as Cl2)

* The concentration of NEO-CHLOR MARINETM as Cl2 was controlled using a

digital residual chlorine analyzer CL-MH （manufactured by AQUA LYTIC）.

* The amount of test solution was in accordance with DIN50905; 5cm3-test

solution/cm2-test piece area ≦ (area provision)

（4） Test period

One cycle of the immersion test comprised an immersion period of 14 days and dry period

of 7 days. This cycle was repeated 9 times (approximately 6 months or 180 days).

（5） Immersion method and control of Cl2 concentration

A schematic diagram of the test procedure is shown in Fig. 1. A solution which had been

adjusted to the specified concentration was poured into a container which was sealed to

prevent evaporation of the solution. Then the test pieces were set in the solution in a natural

immersion condition. The container in which the test pieces were immersed is then placed in a

large, temperature-controlled plastic water tank and held for the specified time. Adjustment of

the test solution was performed at the start of each cycle, and on each occasion, fresh test

solution was used. The effective Cl2 concentration at the time of initial injection was 10 ppm,

and changes over time in the concentration of the NEO-CHLOR MARINETM were controlled

so as to maintain a Cl2 concentration of 5 ppm or more at all times. The measured Cl2

concentration values before control were shown in the tables at the end of this report.

Fig. 1 Schematic diagram of corrosion test

Covered with aluminum foil, etc. Heat with temperature regulator

Plastic water tank

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4

3. Evaluation Test Method

Table 3 shows a summary of the scheduled test items and completed test items. The

evaluations shown in Table 3 were performed with the test pieces used in the corrosion test.

Details of the tests are described in the following.

Table 3 Combinations of test piece types and evaluation items

Unpainted test pieces Painted test pieces Test piece type

Carbon steel Zn-coated Modified epoxy Pure epoxy

Immersion solution Natural seawater Natural seawater Natural seawater Natural seawater

Temperature （°C） 23 35 23 35 23 35 23 35

Cl concentration （ppm） 0 10 0 10 0 10 0 10 0 10 0 10 0 10 0 10

3 months ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●① Observation of

appearance 6 months ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●

3 months ● ● ● ● ― ― ― ― ― ― ― ― ― ― ― ―② Weight

measurement 6 months ● ● ● ● ― ― ― ― ― ― ― ― ― ― ― ―

3 months ― ― ― ― ● ● ● ● ● ● ● ● ● ● ● ●③ Film thickness

measurement 6 months ― ― ― ― ● ● ● ● ● ● ● ● ● ● ● ●

3 months ― ― ― ― ― ― ― ― ● ● ● ● ● ● ● ●④ Adhesion force

measurement 6 months ― ― ― ― ― ― ― ― ● ● ● ● ● ● ● ●

3 months ― ― ― ― ― ― ― ― ● ● ● ● ● ● ● ●

Eva

luat

ion

⑤ Judgment of

adhesion of scribed part 6 months ― ― ― ― ● ● ● ● ● ● ● ● ● ● ● ●

（○ :Planned but not completed, ● : Completed, ― : Not planned）

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5

(1) Observation of external appearance

With unpainted test pieces, the condition of corrosion was confirmed by visual inspection,

and at the same time, photographs were taken with a digital camera. Photographs were taken

before the test, after 4 cycles, and after 9 cycles. After completion of the specified corrosion

test, the corrosion product was lightly removed and the condition of the steel surface was

photographed. With painted test pieces, the condition of corrosion was confirmed by visual

inspection, and at the same time, photographs were taken with a digital camera. Deterioration

of the paint film was evaluated based on ISO 4628-2, 3, 4, 5.

(2) Weight measurement

With unpainted test pieces, weight was measured before the test, after 4 cycles, and after 9

cycles (after rust removal), and the corrosion rate was calculated from the measured weight

reduction.

(3) Film thickness measurement

With selected Zn-coated test pieces and painted test pieces, the coating thickness and paint

film thickness were measured at several spots before the test, after 4 cycles, and after 9 cycles

using an electromagnetic thickness gauge, and the average value was obtained.

(4) Adhesion force measurement

With painted test pieces, the adhesion force of the paint film was evaluated in accordance

with ISO 4624 in the initial stage (untested material), after 4 cycles, and after 9 cycles of the

corrosion test. After the object surface of the test piece was sufficiently roughened and

smoothed with emery paper (approximately #80), a tensile test jig was glued to the paint film

with an epoxy adhesive. After the adhesive hardened, cuts were made around the tensile test jig

to the base metal. Tension was then applied in the vertical direction at a tension rate of 10

mm/min using a tensile tester, and the rupture strength of the paint film was measured. This

test was repeated n = 3 cycles with each test piece, and the average of these values was

calculated to obtain adhesion force. The rupture surface was also observed after measurement

of adhesion force.

(5) Evaluation of adhesion of scribed (cut) part

With Zn-coated test pieces and painted test pieces, the degree of peeling of the scribed

(cut) part was evaluated in accordance with ISO4628-8 after completion of the specified

corrosion test. The peeled part of the Zn-coating or paint film around the cut part after the

corrosion test was forcibly chipped with a cutter, etc. and evaluated based on the classification

shown in examples in ISO4628-8.

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6

4. Test Results

4.1 Carbon Steel Test Pieces

4.1.1 Observation of External Appearance

The external appearance of the carbon steel test pieces before the corrosion test, after

corrosion test of 4 cycles, after those of 9 cycles, and after lust removal is shown in Tables 4

and 5.

4.1.2 Weight Measurement

The results of weight measurements of the carbon steel test pieces after 4 cycles of the

corrosion test and the results of conversion of the measured weight reduction to corrosion rate

are shown in Tables 6 and 7, and Fig. 2. In comparison with the corrosion rate in natural

seawater, a slightly increased tendency can be seen in the corrosion rate in seawater with

added NEO-CHLOR MARINETM. In the results shown here, the corrosion rate was lower at

35°C than at 23°C. The reason for this is not clearly understood.

4.2 Zn-coated Test Pieces


The external appearance (including the scribed part) before the corrosion test and after 4

cycles and 9 cycles is shown in Table 8.

4.2.2 Coating Thickness Measurement

The results of measurements of the coating thickness of the Zn-coated test pieces are

shown in Table 9-1 and 9-2, and the coating thickness reductions are shown in Fig. 3.

Compared to the coating thickness reductions (corrosion amounts) in natural seawater, those in

seawater with added NEO-CHLOR MARINETM tended to be larger.

4.2.3 Judgment of Adhesion

Chipping the peeled Zn-coating layer around the scribed part of the coating after 9 cycles

(6 months), the judgment results are shown in Table 8. No peel was observed for each

specimen after chipping and the adhesion was judged in accordance with ISO 4628-8 as

Grade-1.

4.3 Painted Test Pieces


Photographs of the external appearance of the painted test pieces before the corrosion test,

after 4 cycles, and after 9 cycles are shown in Tables 10 to 13. No blistering, rust, cracking,

peeling, etc. was observed in the paint films without scribing. The results of an evaluation

based on ISO4628-2 to 5 are also shown in Tables 10 to 13.

4.3.2 Film Thickness Measurement

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7

The results of measurements of the film thickness of the painted test pieces are shown in

Tables 14 to 17, and Fig. 4. At 23°C, changes in the film thickness were minimal until after 4

cycles, but the film thickness reductions increased after 9 cycles. At 35°C, the film thickness

tended to decrease in comparison with the initial film thickness. This is considered to be due to

very gradual progress of the hardening reaction of the paint film after the start of the corrosion

test.

4.3.3 Adhesion Force Measurement

The results of measurements of the adhesion force of the paint film are shown in Tables 18

and 19, and Fig. 5. The external appearances of the rupture surfaces after measurement of

adhesion force are shown in Tables 20 and 21. No decrease was observed in the adhesion force

of the paint film after the corrosion test after 4 cycles in comparison with the test pieces which

were not immersed (untested test pieces). But some decrease was observed in the adhesion

force of those of after 9 cycles. Furthermore, no effects of addition of NEO-CHLOR

MARINETM as 10ppm Cl2 could be observed. Virtually all rupture of the paint film occurred

mainly at the interface between the layers of the paint film, and virtually no rupture occurred at

the interface between the carbon steel and the paint film. It is thus concluded that no

deterioration in paint film anticorrosion performance occurred.

4.3.4 Adhesion Evaluation

The external appearances of the scribed part of the paint film are shown in Tables 22 and

23. The results of an evaluation based on ISO 4628-8 made after chipping the peeled paint film

in the area around the scribed part are also shown in Tables 22 and 23. Virtually no peeling of

the paint film from the scribed part was observed, and in all cases, the adhesion grade was

judged to be Grade 1.

5. Conclusion

Corrosion tests were performed for approximately 180 days (9 cycles) on carbon steel test

pieces, Zn-coated steel test pieces, and painted test pieces to evaluate their properties, and the

following conclusions were reached. :

(1) Due to addition of NEO-CHLOR MARINETM 10ppm as Cl2, the corrosion rate of the

carbon steel test pieces slightly increased.

(2) Due to addition of NEO-CHLOR MARINETM 10ppm as Cl2, the corrosion amount of the

Zn-coated steel test pieces tended to increase.

(3) In spite of addition of NEO-CHLOR MARINETM 10ppm as Cl2, the paint film adhesion

hardly decreased. No effect of the addition was observed.

W1100800-1/W1101118-1

8

Table 4 External appearance of unpainted (carbon steel) test pieces after 4 cycle tests

Before test After 4 cycles After rust removal Test

temperature

（C）

Immersion solution Test piece

name Front side Back side Front side Front side Back side Front side

5

Natural seawater

6

1

23

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2 2

13

Natural seawater

14

9

35

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2 10

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9

Table 5 External appearance of unpainted (carbon steel) test pieces after 9 cycle tests

Before test After 4 cycles After rust removal Test

temperature

（�）

Immersion solution Test piece

name Front side Back side Front side Back side Front side Back side

7

Natural seawater

8

3

23

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2 4

15

Natural seawater

16

11

35

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2 12

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10

Table 6 Results of weight measurement of unpainted (carbon steel) test pieces （after 4 cycles）

Weight （g） Test

temp.

（°C）

Test solution No. of

cycles

Test

piece

No.

Before

test

Before

test

Before

test

Corrosion

rate

（mm/ year）

Average

corrosion

rate

（mm/year）

5 30.0968 29.1127 0.9841 0.181 Natural seawater 4

6 29.9904 29.0325 0.9579 0.176 0.179

1 29.9896 28.8428 1.1468 0.211 23

Natural seawater

+ NEO-CHLOR

MARINETM

10ppm as Cl2

4 2 29.8389 28.7387 1.1002 0.203

0.207


14 29.9271 29.5405 0.3866 0.071 0.072

9 30.0084 29.4385 0.5699 0.105 35

Natural seawater

+ NEO-CHLOR

MARINETM

10ppm as Cl2

4 10 30.0619 29.4991 0.5628 0.104

0.105

Table 7 Results of weight measurement of unpainted (carbon steel) test pieces （after 9 cycles）

Weight （g） Test

temp.

（°C）

Test solution No. of

cycles

Test

piece

No.

Before

test

Before

test

Before

test

Corrosion

rate

（mm/ year）

Average

corrosion

rate

（mm/year）


8 29.8398 28.5601 1.2797 0.109 0.112

3 30.0446 28.4844 1.5602 0.132 23 Natural seawater

+ NEO-CHLOR

MARINETM

10ppm as Cl2

9

4 29.8400 28.2422 1.5978 0.136

0.134


16 29.9247 29.1323 0.7924 0.067 0.067

11 29.9305 28.6886 1.2419 0.106 35 Natural seawater

+ NEO-CHLOR

MARINETM

10ppm as Cl2

9

12 30.0642 28.8356 1.2286 0.104

0.105

W1100800-1/W1101118-1

11

-0.01

0.01

0.03

0.05

0.07

0.09

0.11

0.13

0.15

0.17

0.19

0.21

0.23

0.25

0.27

0.29

0.31

0.33

0.35

Figure 2 Comparison of corrosion rates of unpainted (carbon steel) test pieces with 10ppm

NEO-CHLOR MARINETM as Cl2 (after 4 and 9 test cycles)

Test temperature: 23℃

Test temperature: 35℃ 0.181 0.176

0.211 0.203

0.072 0.071

0.105 0.104

Natural seawater Natural seawater

+ NEO-CHLOR MARINETM 10ppm as Cl2

Natural seawater

Ave

rage

cor

rosi

on s

peed

(m

m/y

ear)

4 cycle 9 cycle 4 cycle 4 cycle 4 cycle 9 cycle 9 cycle 9 Cycle

Natural seawater

+ NEO-CHLOR MARINETM 10ppm as Cl2

0.115 0.109

0.1320.136

0.066 0.067

0.106 0.104

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12

Table 8 External appearance and results of evaluation of adhesion of Zn-coated test pieces

(with scribing)

Test

Temp.

（˚C）

Immersion

solution

Test

piece

No

Position Before test After 4 cycles

After 9 cycles

Evaluation

of

Adhesion

Full

surface

Natural

seawater 2

Scribed

part

Grade1

Full

surface

23

Natural

seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

1

Scribed

part

Grade1

Full

surface

Natural

seawater 4

Scribed

part

Grade1

Full

surface

35

Natural

seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2

3

Scribed

part

Grade1

W1100800-1/W1101118-1

13

Table 9-1 Results of thickness measurement of Zn-coated test pieces (After 4 cycles)

Film thickness （μm） Test

tempe

rature

（℃）

Immersion solution

Test

piece

No

Measurement

point Before testAfter

4 cycles

Amount of

change*

1 80 83 -3

2 76 78 -1

3 79 79 -1

4 82 86 -5

5 87 89 -1

6 86 87 -1

Natural seawater 2

Average 82 84 -2

1 83 88 -5

2 83 84 -1

3 72 82 -10

4 89 111 -22

5 88 91 -2

6 90 92 -2

23

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

1

Average 84 91 -7

1 99 98 2

2 103 97 6

3 99 95 5

4 92 90 2

5 94 90 4

6 89 133 -44

Natural seawater 4

Average 96 100 -4

1 99 108 -10

2 91 121 -30

3 91 110 -19

4 110 121 -11

5 100 142 -42

6 99 128 -29

35

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

3

Average 98 122 -23

*（Amount of change （μm）＝ Film thickness after 4 cycles （μm） - Film thickness before test（μm）

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14

Table 9-2 Results of thickness measurement of Zn-coated test pieces (After 9 cycles)


tempe

rature

（℃）

Immersion solution

Test

piece

No

Measurement


9 cycles

Amount of

change*

1 80 90 -9

2 76 91 -34

3 79 87 -5

4 82 114 -7

5 87 96 -2

6 86 98 -3

Natural seawater 2

Average 82 96 -10

1 83 90 -7

2 83 110 -8

3 72 84 -15

4 89 88 -25

5 88 90 -7

6 90 89 -8

23

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

1

Average 84 92 -12

1 99 107 -3

2 103 118 1

3 99 103 2

4 92 139 1

5 94 128 2

6 89 119 -37

Natural seawater 4

Average 96 119 -6

1 99 102 -9

2 91 102 -27

3 91 97 -12

4 110 92 -29

5 100 92 -28

6 99 126 -20

35

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

3

Average 98 102 -21

*（Amount of change （μm）＝ Film thickness after 9 cycles（μm） - Film thickness before test（μm）

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15

-15

-10

-5

0

5

10

15

20

254サイクル

9サイクル

Figure 3 Film thickness decrease of Zn-coated test pieces

23℃ 35℃

Ave

rage

dec

reas

e of

film

thic

knes

s (

µm

)

Natural seawater Natural Seawater + 10ppm NEO-CHLOR MARINETM

23℃ 35℃

2 4

23 4cycles

9cycles

7

10

6

12

21

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16

Table 10 External appearance and results of evaluation of deterioration of painted test pieces（modified epoxy）（no scribing, after 4cycles）

External appearance Evaluation of deterioration (Grade) Test

temperature

（℃）

Immersion solution

Test

piece

No Before test After 4 cycles

Blistering

（ISO 4628-2）

Rust

（ISO 4628-3）

Cracking

（ISO 4628-4）

Peeling

（ISO 4628-5）

Natural seawater 3 Blistering

（ISO 4628-2）

Rust

（ISO 4628-3） None（0） None（0）

23

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2

1 None None（Ri0） None（0） None（0）

Natural seawater 7 None None（Ri0） None（0） None（0）

35

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2


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17

Table 11 External appearance and results of evaluation of deterioration of painted test pieces（modified epoxy）（no scribing, after 9 cycles）

External appearance Evaluation of deterioration (Grade) Test

temperature

（℃）

Immersion solution

Test

piece


Blistering

（ISO 4628-2）

Rust

（ISO 4628-3）

Cracking

（ISO 4628-4）

Peeling

（ISO 4628-5）

Natural seawater 11 None None（Ri0）なし（0）なし（0）

23

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2

9 None None（Ri0）なし（0）なし（0）

Natural seawater 15 None None（Ri0）なし（0）なし（0）

35

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2

13 None None（Ri0）なし（0）なし（0）

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18

Table 12 External appearance and results of evaluation of deterioration of painted test pieces（pure epoxy）（no scribing, after 4 cycles）

External appearance Evaluation of deterioration (grade) Test

temperature

（℃）

Immersion solution

Test

piece


Blistering

（ISO 4628-2）

Rust

（ISO 4628-3）

Cracking

（ISO 4628-4）

Peeling

（ISO 4628-5）


23

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2



35

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2


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Table 13 External appearance and results of evaluation of deterioration of painted test pieces（pure epoxy）（no scribing, after 9 cycles）

External appearance Evaluation of deterioration (grade) Test

temperature

（℃）

Immersion solution

Test

piece


Blistering

（ISO 4628-2）

Rust

（ISO 4628-3）

Cracking

（ISO 4628-4）

Peeling

（ISO 4628-5）

Natural seawater 61 None None (Ri0） None (0） None (0)

23

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2

59 None None (Ri0） None (0） None (0）

Natural seawater 65 None None (Ri0） None (0） None (0)

35

Natural seawater +

NEO-CHLOR

MARINETM

10ppm as Cl2

63 None None (Ri0） None (0） None (0)

W1100800-1/W1101118-1

20

Table 14 Results of measurement of film thickness of painted test pieces

（modified epoxy, after 4 cycles）


temp

eratur

e

（℃）

Immersion solution

Test

piece

No

Measurem

ent point Before testAfter 4

cycles

Amount of

change*

1 359 360 -1

2 372 373 -1

3 388 390 -2

4 354 350 4

5 366 365 1

6 369 378 -9

Natural seawater 3

Average 368 369 -1

1 390 388 2

2 364 364 0

3 361 365 -4

4 391 387 4

5 372 360 12

6 375 388 -13

23

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

1

Average 376 375 1

1 410 403 7

2 411 399 12

3 386 384 2

4 423 405 18

5 434 419 15

6 399 400 -1

35 Natural seawater 7

Average 411 402 9

1 422 421 1

2 406 406 0

3 420 427 -7

4 413 409 4

5 436 411 25

6 432 410 22

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

5

Average 422 414 8

*（Amount of change （μm）＝ Film thickness （μm） after 4 cycles - Film thickness （μm） before test

W1100800-1/W1101118-1

21


（modified epoxy, after 9 cycles）


temp

eratu

re

（℃）

Immersion solution

Test

piece

No

Measurement


9 cycles

Amount of

change*

1 386 388 -2

2 406 399 7

3 415 398 17

4 370 372 -2

5 414 404 10

6 431 423 8

Natural seawater 11

Average 404 397 6

1 438 407 31

2 406 389 17

3 394 378 16

4 421 399 22

5 410 404 6

6 408 374 34

23

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

9

Average 413 392 21

1 390 388 12

2 437 405 24

3 428 397 26

4 397 376 12

5 418 403 6

6 423 402 26

35 Natural seawater 15

Average 416 395 18

1 388 376 2

2 423 399 32

3 446 420 31

4 388 376 21

5 408 402 12

6 441 415 21

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

13

Average 416 398 20


W1100800-1/W1101118-1

22


（pure epoxy, after 4 cycles）


tempe

rature

（℃）

Immersion solution

Test

piece

No

Measurement


4 cycles

Amount of

change*

1 359 355 4

2 363 364 -1

3 362 347 15

4 372 360 12

5 365 364 1

6 347 348 -1

Natural seawater 53

Average 361 356 5

1 399 382 17

2 388 392 -4

3 392 402 -10

4 380 381 -1

5 376 381 -5

6 383 374 9

23

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

51

Average 386 385 1

1 394 377 17

2 414 396 18

3 398 385 13

4 392 376 16

5 398 382 16

6 389 376 13

Natural seawater 57

Average 398 382 16

1 370 355 15

2 386 348 38

3 348 339 9

4 392 363 29

5 379 353 26

6 351 330 21

35

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

55

Average 371 348 23


W1100800-1/W1101118-1

23


（pure epoxy, after 9 cycles）


temp

eratu

re

（℃）

Immersion solution

Test

piece

No

Measurement

point Before testAfter 9

cycles

Amount of

change*

1 386 368 18

2 391 370 21

3 381 342 39

4 380 382 -2

5 372 391 -19

6 374 363 11

Natural seawater 61

Average 381 369 11

1 436 409 24

2 416 393 24

3 411 379 23

4 438 400 36

5 419 395 31

6 405 375 27

23

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

59

Average 421 392 28

1 353 343 10

2 378 369 9

3 397 377 20

4 365 359 6

5 382 362 20

6 353 347 6

Natural seawater 65

Average 371 360 12

1 368 347 21

2 356 349 7

3 364 349 15

4 385 358 27

5 381 360 21

6 376 353 23

35

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

63

Average 372 353 19


W1100800-1/W1101118-1

24

-30

-25

-20

-15

-10

-5

0

54サイクル

9サイクル

Modified epoxy

-30

-25

-20

-15

-10

-5

0

54サイクル

9サイクル

Pure epoxy

Fig. 4 Results of measurement of film thickness of painted test pieces

23℃ 35℃

23℃ 35℃

23℃ 35℃

23℃ 35℃

+1

-9

-5

-16

-1

-8

-1

-23

-6

-18

-21 -20

-11 -12

-28

-19

Natural seawater Natural seawater +

10ppm NEO-CHLOR MARINETM

Ave

rage

chan

ge o

f film

thic

knes

s,μ

m

Ave

rage

cha

nge

of f

ilm

thic

knes

s, μ

m

Natural seawater Natural seawater +

10ppm NEO-CHLOR MARINETM

4 cycles

9 cycles

4 cycles

9 cycles

W1100800-1/W1101118-1

25

Table 18 Results of measurement of adhesion force of painted test pieces (After 4 cycle)

Adhesion force （N/mm2） Test

piece

type

Test solution

Test

temperature

（℃）

No.

of

cycles

Test

piece

No. 1 2 3 Average

Not tested ― ― 19 5.7 5.9 5.1 5.6

Natural seawater 23 4 4 7.1 7.7 5.9 6.9

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

23 4 2 7.4 7.3 5.3 6.7


Modified

epoxy

paint

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

35 4 6 5.7 7.8 7.0 6.8

Not tested ― ― 69 4.9 7.6 5.8 6.1


Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

23 4 52 8.6 7.1 8.1 7.9


Pure

epoxy

paint

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

35 4 56 7.3 8.9 8.9 8.4

W1100800-1/W1101118-1

26

Table 19 Results of measurement of adhesion force of painted test pieces (After 9 cycle)

Adhesion force （N/mm2） Test

piece

type

Test solution

Test

temperature

（℃）

No. of

cycles

Test

piece

No. 1 2 3 Average

Not tested ― ― 19 5.7 5.9 5.1 5.6


Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

23 9 10 4.4 5.1 4.8 4.8


Modified

epoxy

paint

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

35 9 14 4.8 3.3 4.8 4.3

Not tested ― ― 69 4.9 7.6 5.8 6.1


Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

23 9 60 4.6 4.1 4.2 4.3


Pure

epoxy

paint

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

35 9 64 4.8 5.1 4.8 4.9

W1100800-1/W1101118-1

27

0

1

2

3

4

5

6

7

8

9

10未試験

4サイクル後

9サイクル後

Modified epoxy

0

1

2

3

4

5

6

7

8

9

10未試験

4サイクル

9サイクル

Pure epoxy

Fig. 5 Results of measurement of adhesion force of painted test pieces

23℃ 35℃

23℃ 35℃

23℃ 35℃ 23℃ 35℃

5.6

6.9

7.6

6.7 6.8

6.1

7.7

8.7

7.98.4

5.65.9

4.8 4.3

5.45.1

4.3 4.9

Adh

esio

n fo

rce,

N/m

m2

Not tested Natural seawater Natural seawater + 10ppm NEO-CHLOR MARINETM

Adh

esio

n fo

rce,

N/m

m2

Not tested Natural seawater Natural seawater + 10ppm NEO-CHLOR MARINETM

4 cycles

Not tested

9 cycles

4 cycles

Not tested

9 cycles

W1100800-1/W1101118-1

28

Table 20 External appearance of rupture surface after measurement of adhesion force

(After 4 cycle)

Test solution

Test

piece

No.

Modified epoxy paint (ME)

Test

piece

No.

Pure epoxy paint

Not tested 19 69

Natural seawater

23℃ 4 54

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

23℃

2 52

Natural seawater

35℃ 8 58

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

35℃

6 56

W1100800-1/W1101118-1

29

Table 21 External appearance of rupture surface after measurement of adhesion force

(After 9 cycle)

Test solution

Test

piece

No.

Modified epoxy paint (ME)

Test

piece

No.

Pure epoxy paint

Natural seawater

23℃ 12 62

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

23℃

10 60

Natural seawater

35℃ 16 66

Natural seawater

+

NEO-CHLOR

MARINETM

10ppm as Cl2

35℃

14 64

W1100800-1/W1101118-1

30

Table 22 External appearance and results of adhesion evaluation of painted test pieces (modified epoxy)

(with scribing, after 4cycles)

Test

tempe

rature

（°C）

Immersion

solution

Test

piece

No

Position Before test After 4 cycles After chipping

Adhesion

evaluation

(Grade)

Full

surface

Natural

seawater 29

Scribed

part

Grade1

Full

surface

23

Natural

seawater

+

NEO-CHLOR

MARINETM

10 ppm

as Cl2

28

Scribed

part

Grade1

Full

surface

Natural

seawater 31

Scribed

part

Grade1

Full

surface

35

Natural

seawater

+

NEO-CHLOR

MARINETM

10 ppm

as Cl2

30

Scribed

part

Grade1

W1100800-1/W1101118-1

31

Table 23 External appearance and results of adhesion evaluation of painted test pieces (modified epoxy)

(with scribing, after 9 cycles)

Test

tempe

rature

（°C）

Immersion

solution

Test

piece

No

Positio

n Before test After 9 cycles After chipping

Adhesion

evaluation

(Grade)

Full

surface

Natural

seawater 33

Scribed

part

Grade1

Full

surface

23

Natural

seawater

+

NEO-CHLOR

MARINETM

10 ppm as

Cl2

32

Scribed

part

Grade1

Full

surface

Natural

seawater 36

Scribed

part

Grade1

Full

surface

35

Natural

seawater

+

NEO-CHLOR

MARINETM

10 ppm as

Cl2

34

Scribed

part

Grade1

W1100800-1/W1101118-1

32

Table 24 External appearance and results of adhesion evaluation of painted test pieces (pure epoxy)


Test

Temp.

（°C）

Immersion

solution

Test

piece

No


Adhesion

evaluation

(Grade)

Full

surface

Natural

seawater 80

Scribed

part

Grade1

Full

surface

23

Natural

seawater

+

NEO-CHLOR

MARINETM

10 ppm as Cl2

79

Scribed

part

Grade1

Full

surface

Natural

seawater 82

Scribed

part

Grade1

Full

surface

35

Natural

seawater

+

NEO-CHLOR

MARINETM

10 ppm as Cl2

81

Scribed

part

Grade1

W1100800-1/W1101118-1

33

Table 25 External appearance and results of adhesion evaluation of painted test pieces (pure epoxy)


Test

Temp.

（°C）

Immersion

solution

Test

piece

No


Adhesion

evaluation

(Grade)

Full

surface

Natural

seawater 84

Scribed

part

Grade1

Full

surface

23

Natural

seawater

+

NEO-CHLOR

MARINETM

10 ppm

as Cl2

83

Scribed

part

Grade1

Full

surface

Natural

seawater 86

Scribed

part

Grade1

Full

surface

35

Natural

seawater

+

NEO-CHLOR

MARINETM

10 ppm as

Cl2

85

Scribed

part

Grade1

W1100800-1/W1101118-1

34

Table 26 Measured TRO value (as Cl2) of Natural seawater + NEO-CHLOR MARINETM

（Test Cycle 1）

TRO (as Cl2) (ppm) Test

Temp. Kind of specimen

Initial Day 1 Day 2 Day 5 Day 6 Day 7 Day 8 Day 9 Day 12 Day 13 Day 14

3 month Tests Piece 12 0.81 2.96 0.35 3.45 4.83 2.64 1.56 4.43 2.47

6 month Tests Piece 12 1.20 3.25 0.30 3.62 4.23 2.15 1.27 4.76 1.95 23℃

Unpainted Test Piece 10 1.34 2.79 ＜0.05 2.14 1.91 2.18 0.31 2.33 1.93


6 month Tests Piece 11 0.12 0.54 ＜0.05 0.59 0.84 0.99 0.07 0.84 1.14 35℃

Unpainted Test Piece 10 0.12 0.74 0.05 0.52 0.59 0.62 ＜0.05 0.25 0.30

（Test Cycle 2）




3 month Tests Piece 10 3.43 1.24 1.40 5.19 2.31 4.85 2.51 1.36 4.35 2.12

6 month Tests Piece 11 2.78 5.38 0.81 3.82 1.79 4.28 2.51 1.31 4.35 2.23 23℃

Unpainted Test Piece 9 ＜0.05 0.07 ＜0.05 ＜0.05 ＜0.05 0.45 0.84 ＜0.05 0.89 1.10



Unpainted Test Piece 9 ＜0.05 0.05 ＜0.05 0.41 1.48 1.21 1.08 ＜0.05 0.84 0.96

23℃ Blank 10 3.87 3.33 3.26 2.44 12 5.02 5.99 4.16 4.08 4.05

W1100800-1/W1101118-1

35

（Test Cycle 3）






Unpainted Test Piece 9 ＜0.05 ＜0.05 0.08 0.76 1.85 1.65 ＜0.05 1.04 1.04

3 month Tests Piece 10 2.62 ＜0.05 0.87 1.07 1.57 1.08 0.05 0.69 0.92

6 month Tests Piece 9 1.53 ＜0.05 1.30 1.50 1.89 1.89 ＜0.05 1.29 1.36 35℃

Unpainted Test Piece 9 ＜0.05 ＜0.05 0.86 0.16 0.05 0.08 ＜0.05 ＜0.05 0.05

23℃ Blank 9 2.84 4.38 5.26 5.59 4.60 4.03 2.35 4.86 5.74

（Test Cycle 4）






Unpainted Test Piece 9 ＜0.05 ＜0.05 ＜0.05 2.20 1.70 1.86 2.02 ＜0.05 2.24 1.55

3 month Tests Piece 9 1.06 0.31 ＜0.05 0.47 0.21 0.34 0.70 0.05 0.74 0.36

6 month Tests Piece 9 0.80 0.06 0.10 0.68 0.49 0.67 0.99 ＜0.05 1.10 0.87 35℃

Unpainted Test Piece 9 ＜0.05 ＜0.05 ＜0.05 0.11 0.14 0.39 0.47 ＜0.05 0.96 0.75

W1100800-1/W1101118-1

36

（Test Cycle 5）





Unpainted Test Piece 10 ＜0.05 0.21 2.11 2.72 2.80 2.73 0.95 3.78 1.71

6 month Tests Piece 11 0.05 ＜0.05 1.99 0.42 0.79 0.89 ＜0.05 0.39 0.36 35℃

Unpainted Test Piece 10 0.26 0.11 1.73 2.38 1.78 1.79 0.34 2.34 3.18

（Test Cycle 6）





Unpainted Test Piece 9 ＜0.05 0.69 0.31 1.55 2.92 3.56 1.17 0.83 2.28 3.36

6 month Tests Piece 10 ＜0.05 0.42 ＜0.05 0.18 0.38 0.98 0.12 0.08 0.21 0.87 35℃

Unpainted Test Piece 10 ＜0.05 0.85 0.06 1.03 2.05 1.48 1.59 0.26 1.47 2.29

W1100800-1/W1101118-1

37

（Cycle 7）



初期 1 日後 2 日後 5 日後 6 日後 7 日後 8 日後 9 日後 12 日後 13 日後 14 日後




Unpainted Test Piece 9 0.74 1.47 ＜0.05 1.48 2.32 1.88 ＜0.05 2.54 1.00

（Cycle 8）







Unpainted Test Piece 9 1.46 1.31 ＜0.05 1.17 0.37 0.05 3.85 1.82

W1100800-1/W1101118-1

38

（Cycle 9）





Unpainted Test Piece 9 2.26 1.47 0.08 2.60 2.03 2.42 1.95 0.89 2.50 4.09

6 month Tests Piece 11 0.83 0.11 0.05 0.19 0.56 0.62 0.59 ＜0.05 0.13 0.91 35℃

Unpainted Test Piece 9 0.53 ＜0.05 ＜0.05 0.22 0.38 0.21 0.46 ＜0.05 0.11 2.53

Documents

“PAINT FILM DURABILITY TEST AND UNPAINTED · PDF file“PAINT FILM DURABILITY TEST AND UNPAINTED STEEL SHEET CORROSION TEST” April 24, 2012 JFE Techno-Research Corporation Solutions