Results are reported for electrochemical protection of zirconium in HCl containing 500 ppm ferric ion. Corrosion rate and pit propagation rate data as a function of acid concentration (10-37%) and temperature (25-107°C) are first presented as a basis for observations of SCC and/or intergranular attack (associated with weld metals). U-bend, C-ring and sustained load tensile, and slow strain rate tests were used and compared to define conditions where SCC occurs. Along with electrochemical protection, heat treatment and reducing the ferric ion concentration are presented as ways to alleviate local attacks. Metallography was used to both define the mode of attack and show the benefits of protection techniques.

Subject
Weld attack, Intergranular stress corrosion cracking, Acid concentration, Corrosion rate, Zirconium, Transgranular stress corrosion cracking, Intergranular cracking, C ring stress corrosion testing, U bends, Elongation, Specimen preparation, Stress corrosion cracking, Slow strain rate technique
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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