Crevice and pitting corrosion testing of ferritic stainless steels was conducted in hot, oxygen saturated waters varying in chloride content from 40 ppm to 2000 ppm and with up to 5 ppm of cupric ion. Some of the steels were also tested with autogenous or austenitic welds. The exposed specimens included those with plastic-to-metal crevices and metal-to-metal crevices. The less resistant alloys were of 18Cr and 17Cr-1Mo composition while the more resistant ferritic alloys were of 18Cr-2Mo and 21Cr-3Mo composition.

The tests demonstrated that stainless steels in the as-welded condition were much less resistant to pitting corrosion than unwelded steel. Double pass welding (welding on face and root sides) was found to result in a lower resistance than single pass welding. Variation in the shielding process (99% Ar - 1% O2), basic coated electrode or rutile coated electrode had little effect. Pickling in warm H2SO4 or surface grinding after welding restored the pitting resistance to that of the unwelded base material.

Subject
Pits, Weld attack, Water, Metal surfaces, Molybdenum alloys, Welding, Copper alloys, Crevices, Crevice corrosion, Steel, Pitting, Corrosion resistance, Titanium alloys
© 1982 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).
1982
Association for Materials Protection and Performance (AMPP)
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