The cathodic protection of a domestic water heater is investigated using two magnesium and two aluminum sacrificial alloys. A large range of conductivities and temperatures are investigated. A "most effective" anode material may be chosen for each water condition from the measured corrosion current and tank potential. A water heater is shown to be a well-behaved system of potential, current, conductivity, and temperature; however, some fundamental variables are not yet defined. A foundation is laid for future investigations into the necessary and sufficient conditions for cathodic protection of water heaters.

Subject
Electric current, Water heaters, Water, Materials, Galvanic anodes, Anode potential, Cathodic protection, Magnesium anodes, Anodic current, Steel, Corrosion protection, Conductivity, Anodes
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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