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Repassivation Potential of Alloy 22 in Sodium and Calcium Chloride Brines

Published online by Cambridge University Press:  01 February 2011

Raul B. Rebak ,
Gabriel O. Ilevbare  and
Ricardo M. Carranza
Raul B. Rebak
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Gabriel O. Ilevbare
Affiliation:
Electric Power Research Institute, Palo Alto, CA, 94304, USA
Ricardo M. Carranza
Affiliation:
Atomic Energy Commission of Argentina, 1650 San Martin, Argentina
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Abstract

A comprehensive matrix of 60 tests was designed to explore the effect of calcium chloride vs. sodium chloride and the ratio R of nitrate concentration over chloride concentration on the repassivation potential of Alloy 22. Tests were conducted using the cyclic potentiodynamic polarization (CPP) technique at 75°C and at 90°C. Results show that at a ratio R of 0.18 and higher nitrate was able to inhibit the crevice corrosion in Alloy 22 induced by chloride. Current results fail to show in a consistent way a different effect on the repassivation potential of Alloy 22 for calcium chloride solutions than for sodium chloride solutions

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1107: Scientific Basis for Nuclear Waste Management XXXI , 2008 , 527
Copyright
Copyright © Materials Research Society 2008

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