Importance

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Abstract

The disclosure relates to a coating composition comprising: a) a resin system comprising an organic film-forming resin and optionally a curing agent reactive with the organic film-forming resin, b) a lithium salt with a solubility in water in the range from 0.01 to 120 g/L at 20° C., selected from the group consisting of lithium carbonate, lithium phosphate, lithium bicarbonate, lithium tetraborate, and lithium oxalate, in an amount of at least 1.3 wt. % of lithium based on solid weight of the resin system, and c) a zinc salt of 2,5-dimercapto-1,3,4-thiadiazole (DMTD). The zinc salt of DMTD was shown to have a synergistic effect on the reinforcement of barrier properties of a protective layer that is formed in a coating defect due to the presence of the lithium salt in the coating composition.

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First Claim