A technique employing cathodic polarization to maintain zirconium below its critical repassivation potential was used to avoid pitting and stress cracking in hydrochloric acid containing Fe+3 impurities. The corrosion rate and pit penetration rate are reported for several surface conditions in 10, 20, and 37% HCl with 50, 100, 500 ppm Fe+3 at temperaturesto boiling. Electrochemical protection is evaluated for total immersion, partial immersion, stress cracking U-bend and slow strain rate tensile tests. Protection is effective in eliminating pitting and stress cracking in 10 and 20% HCl. Pickling can be effective in eliminating or reducing pit initiation in 64 day tests for specimens both immersed and exposed to the vapor phase only.

Subject
Pits, Strain rate, Protection practices, Corrosion rate, Zirconium, U bends, Penetration, Pitting, Immersion, Corrosion protection, Protection potential, Stress corrosion cracking, Electrode potential
© 1983 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).
1983
Association for Materials Protection and Performance (AMPP)
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