This program evaluated various surface preparation and application parameters of thermally sprayed metallic coatings (TSMC) on carbon steel with respect to the general and corrosion performance of these TSMC materials. This work was performed for the National Cooperative Highway Research Program (NCHRP) in support of the development of an American Association of State Highway and Transportation Officials (AASHTO) guide for the application of TSMC to steel sheet pile structures.

This program investigated how variations within the application process for TSMC affect performance. Specifically these were: grit blast media, surface profile, edge effects, complex geometry, surface contamination, angle of application (gun angle) and distance of application (standoff). These variables were compared to the general and corrosion performance of the test samples. General performance evaluated: adhesion, flexibility, edge retention, impact resistance, microstructure analysis and sealer coverage. Corrosion performance evaluated the degradation of the TSMC and substrate in constant and cyclic seawater immersion.

This paper will discuss the preparation techniques used to create test samples, their performance in the general and corrosion testing and demonstrate correlations between sample performance and preparation variable(s).

Subject
Test methods, Zinc rich coatings, Materials, Aluminum, Abrasives, Seawater, Steel, Sealers, Immersion, Surface profile, Zinc, Blistering, Steel grit
Keywords:
thermal spray coatings, corrosion, rusting, blistering, sheet piles, steel, seawater, coastal environment
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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