In 1962 The Dow Chemical Company began a laboratory program designed to evaluate a large number of aluminum-based alloys as sacrificial anodes. Early in this program, it was found that short-term laboratory tests described by Robinson1  did not give the good correlation with field results that has been observed with magnesium and zinc. Modifications (which primarily consisted of expending a larger percentage of the test specimen) were made in the procedure. These modifications resulted in much better correlation between laboratory and field data, but some compositions still showed substantially different current capacities on long-term field tests as compared to the modified laboratory test. For that reason, evaluation of commercial aluminum alloys is now done in the field. The purpose of this paper is to describe the field test procedure employed by Dow.

Subject
Cathodes, Electric current, Circuits, Galvanic anodes, Voltage, Aluminum, Open circuits, Anode resistance, Anodic current, Powders, Aluminum alloys, Cleaning, Anodes
© 1968 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).
1968
Association for Materials Protection and Performance (AMPP)
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