Various aspects of galvanic corrosion of Al alloys have been evaluated in some detail by the authors in recent years, Parameters studied include the effect of the nature of a number of dissimilar metals in two (1-6) and three (7) metal couples, the effect of electrolyte composition (8), and the effect of variations of the anode to cathode area ratio (9). All these studies have been conducted in stagnant electrolytes. In a joint effort on the Waterjet Propulsion System project at Rockwell International's Rocketdyne Division, it became important to study the galvanic corrosion of dissimilar materials as a function of velocity of the couple in the electrolyte. Using a special electrode holder for rotating galvanic couples, the galvanic current has been determined as a function of velocity in 3.5% NaCl and substitute ocean water, and polarization curves have been obtained as a function of velocity for single metals. While only a narrow range of velocities was investigated, it was felt that this range is sufficient to evaluate some of the basic questions concerning the effect of velocity on corrosion reactions.

Subject
Water, Corrosion rate, Sodium chloride, Corrosion reactions, Cathodic polarization curves, Anodic reactions, Metals, Steel, Oxygen, Galvanic current, Electrodes, Corrosion potential, Electrolytes
© 1977 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).
1977
Association for Materials Protection and Performance (AMPP)
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