Effect of Al-based coatings deposited by EASC on exfoliation corrosion susceptibility of EN AW 7020-T6

Abstract In this study, the effects of Al99.99, AlMg5 and AlZn2 wire materials coated with electric arc spray coating method on the welded EN AW 7020-T6 material on the exfoliation corrosion behavior of the substrate EN AW 7020-T6 material were investigated. The coatings obtained on the substrate were verified by XRD analysis and the coating adhesion strengths were measured according to ASTM D4541 standard. The exfoliation corrosion tests were conducted based on the ASTM G34-1 standard. No signs of corrosion were observed on the coatings in the visual examination performed after the tests. The effect of the coating’s protective properties was observed in the SEM examinations performed after the visual examination, and as expected, it was observed that neither the base material region of the substrate nor the heat-affected zone of the substrate suffered corrosion damage in all three coating types.