Abstract
We studied the corrosion behavior of galvanized steel with damaged epoxy and epoxy chromate coatings in a slightly acidic medium by the scanning reference electrode technique. We showed that corrosion fracture of a metal in the defect area occurs with separation of specific electrode reactions, and the center of anodic activity moves along the defect during the test. The potential gradient in the defect area decreases about 6 times upon introduction of chromate pigment into the epoxy primer.
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