The effect of ZnO additions on environmental crack growth rates were evaluated using fracture mechanics specimens of sensitized Alloy 600, sensitized type 304 stainless steel, and Alloy 182 weld metal in ≈288°C water containing various levels of dissolved oxygen and H2SO4. The addition of 5 to 10 ppb Zn2+ always resulted in reduced crack growth rates for all materials and in all water chemistries. Similar benefits are expected for other structural materials, such as nonsensitized or irradiated stainless steel, other nickel alloys, and carbon and low alloy steel.

Subject
Crack growth, Water, Stainless alloys, Autoclaves, Sulfates, Water chemistry, Zinc oxide, Crack length, Stainless steel, Alloys, Corrosion potential, Weld metal, Conductivity
Keywords:
Stress corrosion cracking, high temperature water, zinc, stainless steel, nickel-base alloys, crack growth rate, water chemistry
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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