Degrigny, C. Standards and Education. 2010

8/7/2019 Degrigny, C. Standards and Education. 2010

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Leiden, 11-15 January 2010

Standards and education

Christian Degrigny


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use of electrochemical techniques inconservation

-Originally in France: supervision of conservation andengineering students (EDF-Valectra, ART-Mtal,ArcAntique)

-Finland (Master dedicated to marine artefacts): 2001-Switzerland

-Summer school: 2004-Training to master students: since 2008

-Norway (Oslo): master students since 2007-USA: EAS2006: workshop for professionals: 2006-Malta (MCR & Heritage Malta): 2003-2005-Netherlands: ICN and University of Amsterdam since

2000

Experience in training programmes


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Day 1 Day 2 Day 3 Day 4 Day 5

Following of Pract 2+ review of pastresults

Objectives ofthe courseand a bit ofhistoryL1 Basic

principles -Ecorr :Definition andmeasurement

L3: Pourbaixdiagrams

L4: reactions ofpolarized metals in

solutions

L5: Understandingelectrochemical

reactions : the use of apotentiostat

Pract 8: Use ofsacrificial anodes for

polarization, cathodicprotection, electrolytic

pencil, mass treatments,

pulsed current

Pract 1:MeasurementEcorr - Meaning

of Ecorrmeasurement

s

Pract 3: Pourbaixdiagrams and use inconservation

Pract 4:Polarisation byusing a current

generator: settingup and control of

parameters

Pract 6 : Initiation to theuse of a potentiostat

Test 2

Lunch

Following ofPract 1

Application ofelectrochemicaltechniques inconservation:presentation II

L2:Parameters

affecting Ecorr

Pract 2:Parameters

affecting Ecorr

Test 1

Conclusion Discussion -Questions

Application ofelectrochemicaltechniques inconservation:presentation I

Pract 5: Applicationto conservation

issues (reduction oftarnish on copper,

silver and reductionof lead corrosion

products)

Pract 7 : variouspotentiostatic

measurements: cathodiccurves, identification ofpeaks, influence of thedifferent influences

Afternoonsessions

Morningsessions

Course programmes


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Day 1

Introduction to the principles and the electrochemicalparameters: Ecorr (meaning, measurement,reproducibility)

Monitoring vs time, effect of the alloying elements, theoxyded state,

-1400

-1200

-1000

-800

-600

-400

-200

0

200

0 50 100 150 200 250 300 350

Temps (minutes)

Eco

rr(mV/ESH)

Cu

Al

Pb

Sesquicarbonate de sodium 1%, pH=9,5


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Pourbaix diagrams and their use

Day 2

-800

-600

-400

-200

0

200

400

0 50 100 150 200 250 300 350

Temps (minutes)

Ecorr

(mV/ESH)

Ag & Cu

Zn

Fe

Pb

Al

KNO3, pH=7,5

Sn

Immunit / passivation

Immunit / passivation

Passivation

Corrosion

PassivationPassivation

Passivation


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Cu

HNO3 SSKNO3

NaOH Behaviourexpected


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HNO3SS

KNO3NaOH

Al

Behaviourexpected


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-Possibilities of the SPAMT-Test tool

-Choice of appropriate

solutions for storage andstabilisation of metal artefacts

-Monitoring of the artefacts

during the immersion process

Application I in the C-R field


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Day 3

Artificial modification of the electrochemicalparameters to clean or stabilise CH artefacts


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Day 4

Introduction to the use of a potentiostat

X

X

X

X

X

X

X

X

X

X

CE

Cathode

RE

WEPC

Potentiostat

Ecorr

Mn+ + ne- M

Ecp

I (A)

E (V)

EH2

2H2O + 2e- 2OH- + H2


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Day 5

Application II in the C-R field:

-Treatment of artefacts

-Electrolytic pen

-Cathodic protection

-Mass treatment

-Oxydation

-Other applications (pulsedcurrents, composite artefacts,analysis of metals with VMP,

EIS)


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Feedback

- The young generation of C-Rs is trainedproperly all around Europe-Training programmes for C-R professionalshave been setup

-Still only a few C-Rs are using thesetechniques on a daily basis

-Need to include them in research projects asend-users (SPAMT Test)

Documents

Degrigny, C. Standards and Education. 2010