The crevice corrosion and pitting behavior of 70/30 Copper-Nickel (UNS C71500) and Nickel Copper Alloy 400 (UNS N04400) was investigated in natural seawater and chlorinated seawater of nominally 1 mg/L and 90 mg/L concentrations. Flowing seawater tests were conducted using non-metallic sleeves and compression fittings on the outside diameter of tube product. Quiescent seawater tests were performed on plate and tube product with a variety of annular washer and O-ring crevice formers. Both materials exhibited improved corrosion resistance in 1 mg/L chlorinated seawater compared to natural seawater. The high chlorination environment caused significant corrosion of both alloys.

Subject
Marine environments, Materials, Chlorinated seawater, Tubes, Natural seawater, Seawater, Nylon, Crevices, Corrosion attacks, Crevice corrosion, Pitting, Corrosion resistance, Corrosion potential
Keywords:
Uns C71500, Uns N04400, seawater, chlorination, crevice corrosion, pitting
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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