A tube made from SS316L was attacked by stagnated sea water. The typical 'onion' form of the pits were obscured in welded and unwelded sectors of the tube. Iron sulfides FeSt-x and FeS2 (in pyrite form) were observed on effected surface of the tube, in addition to iron chloride and oxide / hydroxide. Theoretic investigation was based on cluster model of alloy and thermodynamic / kinetic characterization of possible reactions.

It was concluded that microbially influenced sulfidizing played accelerating role in the failure that exhibited the typical characteristics for stagnated sea water effect to chromium - nickel stainless steel.

Subject
Pits, Weld attack, Steel surfaces, Water, Materials, Metal surfaces, Iron sulfides, Tubes, Inspection, Metals, Chlorine, Stainless steel, Chemical reactions
Keywords:
corrosion, sea water effect, stainless steel, SRB influenced pitting
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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