Long-term prediction of localized corrosion of high-level nuclear waste container materials is a necessary step in the performance assessment of the engineered barrier system. Localized corrosion of corrosion-resistant materials may occur if the containers are exposed to chloride-containing groundwaters at elevated temperatures. Potentiostatic tests conducted on alloy 825, a candidate container material, have shown that the potential at which localized corrosion can be initiated is a function of surface conditions and time. The initiation potentials for localized corrosion measured in short-term tests with polished specimens overestimated the long-term initiation potentials by as much as 300 mV. On the other hand, the repassivation potential obtained from short-term tests was found to be a conservative parameter in predicting the initiation of localized corrosion after prolonged exposure times.

Subject
Pits, Materials, Repassivation, Repassivation potentials, Containment, Corrosion initiation, Crevices, Penetration, Crevice corrosion, Pitting, Localized corrosion, Corrosion potential, Electrode potential
Keywords:
Alloy 825, high-level waste, chloride, groundwater, repassivation, localized corrosion
© 1995 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1995
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.