KA90, a non-mercury, Al-Zn-Sn alloy sacrificial anode, was developed for cathodic protection of offshore structures in varying water conditions. Non-mercury aluminum sacrificial cathodic protection anodes developed primarily for seawater applications have been of various compositions. Cadmium, indium, lead, thorium, gallium, tin, zinc, beryllium, niobium, titanium and silicon, as alloying impurities, have all been used to simulate or obtain efficiency characteristics of mercury-bearing alloys. Mercury alloys characteristically achieve an average of 2821 amp-hours/kg (1280 amp-hours/pound). To produce a non-mercury alloy, the usual range of efficiencies is between 2535 amp-hours/kg (1150 amp-hours/pound) and 2682 amp-hours/kg (1217 amp-hours/pound).

Subject
Test methods, Materials, Galvanic anodes, Anode potential, Materials performance, Seawater, Electrochemical current, Weight loss, Anodic current, Heat, Brines, Electrolytes, Anodes
© 1980 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).
1980
Association for Materials Protection and Performance (AMPP)
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