In oxidizing environments, electrocatalysis is highly effective in mitigating SCC, provided there is a stoichiometric excess of reductants over oxidants. This paper summarizes the mechanisms and criteria for effective SCC mitigation, with emphasis on the critical location for the catalyst in a crack and recent experimental support for these concepts. Optimization of electrocatalysis using an on-line process is described, and the experimental evidence for mitigation at ≤ 0.1 ppb Pt is presented.

Subject
Crack growth, Water, Corrosion rate, Diffusion, Autoclaves, Corrosion cracking, Crack chemistry, Stress cracking, Intergranular cracking, Crack length, Cracks, Corrosion potential, Stress corrosion cracking
Keywords:
Stress corrosion cracking, catalysis, platinum, water chemistry, stainless steel, Ni alloys, high temperature water
© 2008 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).
2008
Association for Materials Protection and Performance (AMPP)
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