The roles of chromium, molybdenum and copper in determining the resistance of highly alloyed austenitic stainless steels to crevice corrosion and pitting corrosion were evaluated. The methods consisted of determining the potential at which pitting corrosion occurred in 1M NaCl and the minimum solution temperature required to produce crevice corrosion in acidified 10% FeCl3, as well as exposure in sulfuric and formic acids.

Both the electrochemical tests and exposure tests were conclusive in demonstrating the beneficial effect of increasing chromium and molybdenum contents. Copper apparently had little effect on the resistance of the steels tested to pitting or crevice corrosion. Comparison of the experimental steels with a commercial steel suggested that a manganese content around 2.7% may decrease resistance to crevice corrosion compared to similar steels with around 0.5% Mn.

Subject
Water, Molybdenum, Corrosion rate, Chromium, Chemical resistance, Manganese, Crevice corrosion, Steel, Pitting, Corrosion resistance, Copper, Stainless steel, Electrode potential
© 1981 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).
1981
Association for Materials Protection and Performance (AMPP)
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