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Impact of Very Low Concentration of Soluble Salts on Coatings Performance

For offshore platform maintenance coating operation dry grit blasting is a common practice to clean the steel surface. The offshore platform steels are in a various degree of corrosion. It is well known that dry grit blasting alone cannot remove salts completely and some residual salts remain on blasted steel surface. In offshore corrosive environment grit blasted steel surfaces will quickly become rusted within a couple of hours. It is hard to keep the desired near white metal finish for 2-4 hours until the coating spray application. There are several commercial cleaning chemicals to remove residual salts and to extend the surface cleanliness time.This paper covers the testing and comparison of some of these chemicals and impact on coating performance. The evaluation was in 2 parts:1. Compare various salt removal solutions.2. Evaluate the compatibility and impact of the best salt removal solution on coating performance.In the first part of the testing tests showed that one of the products did out-perform the other chemicals to remove residual salts and maintain a desired surface pH.The second part of testing was done since there was a concern about the compatibility of the salt removal product and coatings. Thus the best salt removal product was then further tested with various coating types applied. Three (3) atmosphere coatings and three (3) tank linings (immersion grade) were selected for the compatibility study.The conclusion was that one salt removal solution did out-perform other systems and the salt removal solution was compatibility with the various coatings and improved performance of the coating.

Product Number: 51319-13218-SG
Author: Andy Bodington
Publication Date: 2019
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