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Determination of Crevice Corrosion Susceptibility of Alloy 22 Using Different Electrochemical Techniques

Published online by Cambridge University Press:  01 February 2011

Mauricio Rincon Ortiz ,
Martín A. Rodríguez ,
Ricardo M. Carranza  and
Raul B. Rebak
Mauricio Rincon Ortiz
Affiliation:
mrincon@cnea.gov.ar, Comsion Nacional de Energía Atómica, Materiales, Av. Gral. Paz 1499, San Martín, Buenos Aires, B1650KNA, Argentina, 54-11-6772-7270, 54-11-6772-7362
Martín A. Rodríguez
Affiliation:
maalrodr@cnea.gov.ar, Argentina
Ricardo M. Carranza
Affiliation:
carranza@cnea.gov.arrm.carranza@gmail.com, Comsion Nacional de Energía Atómica, Materiales, Av. Gral. Paz 1499, San Martín, Buenos Aires, B1650KNA, Argentina, 54-11-6772-7270, 54-11-6772-7362
Raul B. Rebak
Affiliation:
rebak@ge.com, GE Global Research, 1 Research Circle, CEB2505, Schenectady, New York, 12309, United States, 518-387-4311
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Abstract

Alloy 22 belongs to the Ni-Cr-Mo family and it is highly resistant to general and localized corrosion. It may suffer crevice corrosion in aggressive environmental conditions. This alloy has been considered as a corrosion-resistant barrier for high-level nuclear waste containers. It is assumed that localized corrosion may occurs when the corrosion potential (ECORR) is equal or higher than the crevice corrosion repassivation potential (ER,CREV). The latter is measured by means of different electrochemical techniques using artificially creviced specimens. These techniques include cyclic potentiodynamic polarization (CPP) curves, Tsujikawa-Hisamatsu electrochemical (THE) method or other non-standard methods, such as the PD-GS-PD technique.

The aim of the present work was to determine reliable critical or protection potentials for crevice corrosion of Alloy 22 in pure chloride solutions at 90°C. Conservative methodologies (which include extended potentiostatic steps) were applied for determining protection potentials below which crevice corrosion cannot initiate and propagate. Results from PD-GS-PD technique were compared with those from these methodologies in order to assess their reliability. Results from the CPP and the THE methods were also considered for comparison. The repassivation potential resulting from the PD-GS-PD technique was conservative and reproducible, and it did not depend on the amount of previous crevice corrosion propagation.

Keywords

Nialloycorrosion
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1265: Symposium AA – Scientific Basis for Nuclear Waste Management XXXIV , 2010 , 1265-AA09-10
Copyright
Copyright © Materials Research Society 2010

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