Stress Corrosion Cracking (SCC) investigations using U-bend specimens were conducted in Samans solutions and its constituents. From the results of these investigations, the role of each individual constituent of Samans solution on SCC has been investigated and the critical species inducing SCC is identified. The effect of change in polythionic acid concentration varying from 0.03 to 0.38 moles/litre on SCC has also been investigated. The corrosion potential (SCE) - time studies during stress corrosion tests in Samans solutions revealed a narrow potential range in which SCC occurred. Some model experiments were setup to ascertain the chemical species causing SCC and the contribution role of oxygen and FeS. Chemical analysis of the solutions after each stress corrosion test was also carried out in all the cases. The electrochemical aspects of SCC in Samans solutions and in solutions of its constituents were also investigated by potentiostatically imposing potentials on the specimens in both anodic and cathodic directions and the effect of imposed potentials on stress corrosion life of the specimen was established. Metallographic examination of the specimens by scanning electron microscope revealed an intergranular mode of fracture in all the cases in which failure occurred.

Subject
Acids, Acid concentration, Free corrosion potential, Corrosion cracking, Stress, Solutions, Mechanical failure, Polythionic acid, Oxygen, Stainless steel, Caustic stress corrosion cracking, Corrosion potential, Stress corrosion cracking
© 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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