This paper describes an approach to the development of preferred chemical compositions for some aluminum-zinc-mercury sacrificial anode alloys used offshore. Two databases with fifty-four and sixty-nine separate groups of analytical and laboratory impressed current test data were compiled Multiple regression analysis shows significant agreement between chemical composition, and measured values of both anode potential and amp-hour per pound capacity.

Regression formulas which relate these characteristics to the amount of each of six elements in an anode heat are used to predict performance for possible compositions within the experience range of the existing database. These hypothetical compositions are defined by an upper limit, a lower limit, and a mean value for each of six important elements. 729 such combinations are possible for 3 levels of the six variables. Ranges of the six elements which give acceptable predicted laboratory performance a very high percentage of the time have been determined.

Subject
Materials, Galvanic anodes, Composition, Materials performance, Laboratory data, Fittings, Constants, Mercury, Heat, Zinc, Elements, Anodes, Samples
Keywords:
sacrificial anode model, electrochemical, elemental analysis, composition, potential, capacity, predictive, formula, mathematical, regression
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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