Previous studies have shown that Zr702 Zirconium (UNS R60702) is one of the best choices for use in hot concentrated hydrochloric acid. While zirconium’s corrosion resistance far exceeds that of most metals, it is susceptible to stress corrosion cracking (SCC) and intergranular attack (IGA) under certain conditions. This paper presents results of testing in 36% HCl with the addition of 100 ppm ferric chloride at temperatures near boiling. The addition of ferric chloride is expected to increase zirconium’s susceptibility to both SCC and IGA. Various heat treatments and surface conditions will be ranked according to their effectiveness in preventing SCC and IGA in this environment.

Subject
Surface finishing, Materials, Corrosion rate, Corrosion cracking, Stress cracking, Vapors, Thermal stress, Liquids, Stress, U bends, Hydrochloric acid, Heat treatment, Stress corrosion cracking
Keywords:
zirconium, Zircadyne® 702, Zr702, Zirconium Grade 702, Uns R60702, intergranular corrosion, IGA, stress corrosion cracking, SCC, pitting
© 2009 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).
2009
Association for Materials Protection and Performance (AMPP)
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