This paper challenges the current industry practice of specifying very low levels of residual soluble salts prior to permitting coating application.

The paper provides antidotal information based on the practical experience of one of the authors and empirical data to support the position of the authors that the industry has defaulted to specifying very low levels in many instances where there is no science to support the specified levels.

The paper evaluates general specified industry thresholds residual soluble salt concentrations at which it is commonly believed that salts begin to have a detrimental effect on coating performance. The analysis method used takes into consideration different factors such as type of service, coating type and surface preparation.

The paper reviews historical practices and the evolution of current practices in the light of the science (or lack thereof) to support these practices.

A cost/benefit analysis demonstrates the need for a more practical approach than industry has been led to believe.

Subject
Test methods, Coating performance, Water, Coatings, Extraction, Contamination, Salts, Corrosion rate, Industries, Salt concentration, Risk management, Chlorides, Conductivity
© 2016 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).
2016
Association for Materials Protection and Performance (AMPP)
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