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10017 Soluble Salt Criteria of Epoxy Coatings for Ship's Water Ballast Tank

Picture for 10017 Soluble Salt Criteria of Epoxy Coatings for Ship's Water Ballast Tank
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Product Number: 51300-10017-SG
ISBN: 10017 2010 CP
Author: Chul-Hwan Lee, Sung-Mo Son, Yun-Ho Baek, and Dae-Young Kim
Publication Date: 2010
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$20.00
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Soluble salt contamination of the substrate prior to coating application will cause premature coating failure at the coating/steel interface as well as underfilm corrosion of the steel substrate, especially when the surface concentration of the soluble salts exceeds a critical level. So, in order to prevent this salt-induced premature coating failure IMO’s PSPC regulation adopted recently for ship’s water ballast tank specified the allowable NaCl limit to be 50 mg/m2 or less for primary and secondary surface preparation. The finalized criterion on the salt contamination, however, can be still subjected to argument mainly due to lack of reasonable technical justification for coating systems of ship’s water ballast tank. In this study, coating performance of epoxy coatings for ship’s water ballast tank were evaluated with soluble salt levels, especially NaCl, in terms of adhesion strength and blistering resistance test in immersion, condensation, and cathodic protection environment to propose reasonable soluble salt criterion. The results based on the coating performance tests for 6 months suggested the maximum allowable NaCl of 70 to 100 mg/m2, depending on epoxy coating formulation used. It is recommended that blistering resistance should be evaluated to determine the criterion of soluble salt since the maximum allowable salt level does vary with coating formulation.

Keywords : soluble salt, NaCl, blistering, protective coating, water ballast tank, IMO PSPC
Soluble salt contamination of the substrate prior to coating application will cause premature coating failure at the coating/steel interface as well as underfilm corrosion of the steel substrate, especially when the surface concentration of the soluble salts exceeds a critical level. So, in order to prevent this salt-induced premature coating failure IMO’s PSPC regulation adopted recently for ship’s water ballast tank specified the allowable NaCl limit to be 50 mg/m2 or less for primary and secondary surface preparation. The finalized criterion on the salt contamination, however, can be still subjected to argument mainly due to lack of reasonable technical justification for coating systems of ship’s water ballast tank. In this study, coating performance of epoxy coatings for ship’s water ballast tank were evaluated with soluble salt levels, especially NaCl, in terms of adhesion strength and blistering resistance test in immersion, condensation, and cathodic protection environment to propose reasonable soluble salt criterion. The results based on the coating performance tests for 6 months suggested the maximum allowable NaCl of 70 to 100 mg/m2, depending on epoxy coating formulation used. It is recommended that blistering resistance should be evaluated to determine the criterion of soluble salt since the maximum allowable salt level does vary with coating formulation.

Keywords : soluble salt, NaCl, blistering, protective coating, water ballast tank, IMO PSPC
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The effect of soluble salts on long-term durability of carbon steels coated with epoxy paint.  A surface was contaminated by different soluble salt concentrations. Based on NORSOK M-501 and ISO 20340, immersion and cathodic disbonding test were done for 6 months.
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