A cathodic-protection anode was manufactured by plasma spraying electrically conducting lithium ferrite coating on button-shaped 99-percent pure titanium and niobium substrates. Lithium ferrite was selected because of its unique adherence to titanium and niobium substrates, as well as its good electrical conductivity, low dissolution rate, and long-range stability. The pitting behavior of titanium substrate was characterized in chloride solutions; the worst case of pitting potential was 9.66 volts. Dissolution tests were conducted on coated anodes in an electrolytic cell under galvanostatic conditions at a current density of 0.2 ampere per square centimeter. The dissolution rate of lithium–ferrite–coated anode was measured by weight loss measurements over a 2–month period and was determined to be 1 to 2 grams per ampere–year in aerated 3.5 percent sodium chloride solution. No damaging effects on the coating were observed. The unique button-shaped anode was designed so that anodes could be easily installed on underground pipes, ships, or on structures in water such as waterway lock gates and elevated water storage tanks without dewatering the structure.

Subject
Water, Voltage, Cathodic protection, Substrates, Spray coating, Dissolution, Niobium, Plasma, Ceramics, Pitting, Titanium, Ferrite, Anodes
© 1983 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).
1983
Association for Materials Protection and Performance (AMPP)
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