The resistance of commercial austenitic, ferritic, and duplex alloys to stress corrosion cracking in a 5%NaOH-2%Na2S-2%Na2CO3-0.2%Na2SO4-0.1%NaCl solution at 150 °C had been studied by immersion tests and electrochemical measurements. The effects of alloy composition, solution composition and test temperature on the occurrence of stress corrosion cracking were examined. It was found that either high chromium or high nickel contents were necessary to increase stress corrosion cracking resistance, and that the presence of sodium chloride, sodium carbonate, and sodium sulfate has little effect on stress corrosion cracking resistance. Cracking of U-bend stressed specimens was found to occur at a potential near the active-passive transition range of SUS304L. The results are discussed with reference to electrochemical behavior and the analyses of surface corrosion films.

Subject
Stainless alloys, Circuit potentials, Sulfide films, Alkaline solutions, Open circuits, Sodium chloride solution, Sodium, Film formation, Sodium hydroxide, Sulfides, Corrosion resistance, Stress corrosion cracking, Chloride stress corrosion cracking
Keywords:
stress corrosion cracking, alkaline environment, stainless alloy
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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