Long-term potentiostatic polarization curves of up to 120 days duration were developed for the following materials: 90-10 copper-nickel (C70600), Monel 400 (N04400), Inconel 625 (N06625), Navy M-bronze (C92200), nickel-aluminum bronze (95800), and HY-80 steel. In addition, potentiostatic polarization curves have been developed for Titanium-50 (R50400), 70-30 copper-nickel (C71500) (C71500) and anode grade zinc (MIL-STD 18001). In addition, short-term potentiodynamic polarization curves were developed at four scan rates and two preexposure levels on specimens of all but the last three of the above materials. The scan rates utilized ranged from 0.5 to 100 volts/hour and preexposure times were 1 hour and 120 days. Long term potentiostatic data was used to predict the behavior of actual two and three metal couples. The predictions had a level of accuracy equal to, or superior than the conventional galvanic corrosion prediction techniques utilizing galvanic corrosion rate tables or corrosion potential differences. Potentiodynamic data from 120 day pre-exposed, low scan rate tests has demonstrated some utility in predicting bi-metal couple behavior.

Subject
Materials, Galvanic anodes, Anode potential, Cathodic potential, Predicted corrosion rate, Nickel based alloys, Zinc anodes, Titanium, Monel alloys, Zinc, Galvanic current, Corrosion potential, Galvanic couple
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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