The effect of fumed zinc oxide additions on the stress corrosion crack initiation and growth of sensitized type 304 stainless steel (SS) were studied in 550°F water containing various amounts of dissolved oxygen. The addition of zinc at levels varying from 3 ppb to 100 ppb showed some benefit in mitigating both crack initiation and growth. Depending on the type of test used, the degree of benefit appear to vary in the broad range from 25 to 55%. The data show that a considerable benefit can be derived by reducing the electrochemical corrosion potential (ECP) of type 304 SS to < -0.110 V (SHE).

Subject
Crack growth, Water, Materials, Intergranular stress corrosion cracking, Boiling water reactors, Autoclaves, Reference electrodes, Crack depth, Mechanical failure, Dissolved oxygen, Zinc, Stainless steel, Electrodes
Keywords:
stress corrosion crack initiation, zinc addition, crack mitigation, electrochemical corrosion potential, sensitized 304 stainless steel
© 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)
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