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Effect of Alloy Composition on the Localized Corrosion Resistance of Nickel Alloys

Published online by Cambridge University Press:  28 March 2012

Santiago Sosa Haudet ,
Martín A. Rodríguez  and
Ricardo M. Carranza
Santiago Sosa Haudet
Affiliation:
Departamento Materiales, Comisión Nacional de Energía Atómica, Argentina.
Martín A. Rodríguez
Affiliation:
Departamento Materiales, Comisión Nacional de Energía Atómica, Argentina. Instituto Sabato, UNSAM / CNEA, Argentina. CONICET, Argentina.
Ricardo M. Carranza
Affiliation:
Departamento Materiales, Comisión Nacional de Energía Atómica, Argentina. Instituto Sabato, UNSAM / CNEA, Argentina.
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Abstract

Nickel base alloys are considered among candidate materials for engineered barriers of nuclear repositories. The localized corrosion resistance is a determining factor in the materials selection for this application. This work compares the crevice corrosion resistance of selected nickel base alloys, namely 625, G-30, G-35, C-22, C-22HS and HYBRID-BC1. The crevice corrosion repassivation potential (ER,CREV) of the tested alloys was determined by the Potentiodynamic-Galvanostatic-Potentiodynamic (PD-GS-PD) method. The testing temperature was 60ºC and the chloride concentrations used were 0.1 M, 1 M and 10 M.

A linear relationship between ER,CREV and the logarithm of chloride concentration was found. ER,CREV increased linearly with PREN (Pitting Resistance Equivalent Number) in concentrated chloride solutions. ER,CREV is the sum of three contributions: ECORR*, η and ΔΦ. ECORR* and η increased linearly with PREN, while ΔΦ increased linearly with PREN for concentrated chloride solutions, not showing a definite trend with PREN for the less concentrated solutions.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-p25
Copyright
Copyright © Materials Research Society 2012

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References

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