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The purpose of this work is to study the impact of the quality of steel surface preparation and the level of soluble salt contamination on the performance and durability of protective coating systems.
The purpose of this work is to study the impact of the quality of steel surface preparation and the level of soluble salt contamination on the performance and durability of protective coating systems. Steel panels were prepared using a standard method and controlled levels of salt contamination were applied to the panels. The performance of three offshore coating systems were investigated. The coating systems were 1) a single coat of a Zinc rich epoxy coating, 2) a two-coats system of Zinc rich epoxy and a high build polyurethane, 3) a three-coats system, composed of a Zinc rich epoxy, an epoxy intermediate and a polyurethane topcoat. The anticorrosive performance of each coating system was assessed according to ISO 12944 and ASTM D5894. The results show that the performance of each system has its own critical level of salt which can be determined, primarily, by exposure to the continuous condensing humidity. This study provides an unequivocal selection tool for the evaluation of the coating systems with a range of salt contamination levels.
Key words: Salt concentration, Surface preparation, Offshore coating system, Coating performance
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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A test protocol was developed to provide an assessment of the effects of various film defects as well as to perform post-exposure qualitative and quantitative evaluations on eight different coatings systems.
Offshore is a very corrosive environment with a high corrosion rate. The offshore coating service life is relatively short and extremely expensive to apply maintenance coatings onsite. A new accelerated coating corrosion test method is proposed.