A series of crevice corrosion tests has been performed to determine the localized corrosion behavior of stainless steels and 70/30 CuNi in three aqueous environments associated with an advanced reverse osmosis (RO) water treatment system. These tests were performed to identify the resistance of candidate RO-membrane cartridge materials to crevice corrosion in the 2nd-pass brine and 3rd-pass (boiler-quality) permeate in the RO system. Because of its inherent resistance to general and localized corrosion in ambient temperature seawater and related brines, titanium has been identified as the primary material for 1st-pass cartridges. Filtered seawater served as a control test environment. Both alloy sheet and tube products were evaluated. Sheet specimens were tested with annular plastic washers (Perspex Crevice Assemblies -PCA's), while the tube specimens were tested with crevices formed by rubber O-rings and rubber-gland-type compression fittings. Present results are compared with those from other related tests. Advantages and limitations of the candidate materials are reviewed.

Subject
Marine environments, Water, Materials, Stainless alloys, Tubes, Seawater, Crevices, Corrosion attacks, Crevice corrosion, Brines, Corrosion resistance, Rubber, Stainless steel
Keywords:
crevice corrosion, crevice geometry, stainless steels, surface finish, seawater, brine, boiler water
© 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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