Abstract
We evaluated magnesium rich epoxy polyamide primers under different environmental exposure conditions. The purpose was to highlight differences in deterioration of these types of coatings as a function of exposure condition. We compared data for samples under constant immersion in dilute Harrison's solution (DHS-CI) to identical samples exposed to 90% relative humidity (90% RH). EOCP, XPS and SEM analysis of the coatings supported our findings that the samples under DHS-CI undergo rapid dissolution and deterioration compared to the 90% RH samples. The difference was that the latter were able to form carbonate corrosion products, which are known to provide additional passivating protection.
Published Version
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