Accelerated Low Water Corrosion (ALWC) is a particularly severe form of microbiologically-induced aggressive localised corrosion, which is most commonly found close to the level of the Lowest Astronomical Tide (LAT) on unprotected steel structures. As a method of controlling ALWC, the calcareous film produced on steel structures that are cathodically protected, has been studied as an inexpensive and environmentally-friendly corrosion control coating, with the intention being that the cathodic protection is applied only for so long as is necessary to develop a protective coating. When deposition are appropriately controlled, it could provide long-term corrosion protection for steel in seawater. In this work, calcareous deposits formed under impressed current cathodic protection (ICCP) using both DC and pulsed current in artificial seawater have been investigated.

Subject
Scanning electron microscopy, Electric current, X-ray diffraction, Films, Water, Corrosion losses, Bubbling, Current densities, Scale formation, Corrosion protection, Deposit corrosion, Blistering, Calcareous deposits
Keywords:
ALWC, low water corrosion, calcareous deposit, endurance, cost effectiveness, environmentally-friendly, quality, DC, pulse current
© 2009 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).
2009
Association for Materials Protection and Performance (AMPP)
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