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11042 The Effect of Water-Soluble Salt Contamination on Coating Performance

Picture for 11042 The Effect of Water-Soluble Salt Contamination on Coating Performance
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Product Number: 51300-11042-SG
ISBN: 2011 11042 CP
Author: Sten B. Axelsen, Ole Øystein Knudsen
Publication Date: 2011
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This paper summarizes the results from laboratory investigations of water-soluble salts’ effect on protective coatings’ performance. The test program has included assessment of both sodium chlorides’ and iron sulphates’ influence on cathodic disbonding, ageing resistance under cyclic climatic conditions, and blistering when immersed in distilled water. Two commercially available epoxy systems and an epoxy clear lacquer were included in the tests.

Salt contaminations had little or no effect on scribe creep during the cyclic test. For all other test parameters, there were significant reductions in the coatings’ performance as the salt concentrations increased.

Key words: adhesion, blistering, cathodic disbonding, scribe creep, underfilm corrosion
This paper summarizes the results from laboratory investigations of water-soluble salts’ effect on protective coatings’ performance. The test program has included assessment of both sodium chlorides’ and iron sulphates’ influence on cathodic disbonding, ageing resistance under cyclic climatic conditions, and blistering when immersed in distilled water. Two commercially available epoxy systems and an epoxy clear lacquer were included in the tests.

Salt contaminations had little or no effect on scribe creep during the cyclic test. For all other test parameters, there were significant reductions in the coatings’ performance as the salt concentrations increased.

Key words: adhesion, blistering, cathodic disbonding, scribe creep, underfilm corrosion
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