By now it is common knowledge that stainless steels ranging from UNS S31600 up to 6% Molybdenum stainless steels and (super)duplex stainless steels do not always resist seawater. Even for fresh natural water it is well known that 2% Molybdenum stainless steels such as UNS S31600 may fail if aggressive biofilms can develop. Seawater resistant copper alloys, such as UNS C70600 and UNS C63000 may fail due to high flow effects. Improper chlorination can cause damage to all above-mentioned alloys. And last but not least, these corrosion resistant alloys (CRA's) can cause galvanic corrosion to nearby steel constructions, or suffer galvanic corrosion if contacted to nearby noble behaving metals such as Titanium. This paper describes cathodic protection options for protecting stainless steels and other CRA’s against localized corrosion and for elimination of galvanic corrosion. The subject 'Anodic Protection' will be discussed as well.

Subject
Water, Galvanic anodes, Piping, Anodic protection, Stainless alloys, Cathodic protection, Seawater, Copper alloys, Pitting, Titanium, Stainless steel, Protection potential, Galvanic corrosion
Keywords:
Stainless steel, titanium, corrosion resistant alloys, seawater, cathodic protection, galvanic corrosion, pump caisson, sacrificial anode, pulsing anode, potential control unit
© 2012 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).
2012
Association for Materials Protection and Performance (AMPP)
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