Although thermal sprayed coatings are usually used to provide wear resistance, they are frequently exposed to corrosive environments. In these situations not only the corrosion resistance of the coating is important, but also the corrosion behavior of the substrate. This is because of the interconnected porosity which is almost always present in thermal sprayed coatings. This paper describes the use of a potentiodynamic cyclic polarization technique to study the corrosion characteristics of thermal sprayed materials. Using this technique, not only relative rates, but mechanisms of corrosion can often be identified. Several standard and new coatings have been characterized using this technique. Of particular note, a new Super D-Gun™1 coating made with Inconel 625 alloy powder was found to be impervious to the aqueous corrosive media.

Subject
Nickel coatings, Coatings, Cyclic polarization, Substrates, Nickel based alloys, Porosity, Crevice corrosion, Steel, Pitting, Corrosion resistance, Alloys, Corrosion potential, Thermal spray coatings
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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