The effect of marine biofilms on the crevice corrosion of stainless steels S31600 and S31725 has been studied using the remote crevice assembly technique. Eight samples of each steel were used in both control and natural seawater. Results showed that biofilms significantly decreased the initiation time for both steels in coastal seawater, and the decrease was due to potential ennoblement by biofilms. Marine biofilms also significantly increased the propagation rate for S31600 and S31725 as measured by current density, weight loss and maximum and average depths of attack. The increase in propagation rate of crevice corrosion was caused by an increase of the cathodic reaction rate by biofilms.

Subject
Cathodes, Water, Corrosion rate, Corrosion initiation, Artificial seawater, Natural seawater, Seawater, Biofilms, Crevices, Corrosion propagation, Crevice corrosion, Stainless steel, Anodes
Keywords:
stainless steels, crevice corrosion, initiation, propagation, biofilm, seawater, current density, weight loss, depth of attack, cathodic polarization
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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