Abstract
We perform accelerated corrosion tests of aluminum-zinc coatings according to the B-117 ASTM standard in the following three modes: (1) CCT mode, which includes drying at 60°C for 4h, holding at a relative humidity of 100% for 2h, and salt spraying (pH=6.8–7.2) at 35°C for 2h; (2) AAR mode, which includes drying at 60°C and a relative humidity of 20–30% for 4h, holding at a relative humidity of more than 90% for 2h, and acid salt spraying (pH=3.5) at 35°C for 2h; (3) NSS, i.e., neutral salt spray test. Electrochemical tests were performed in a 0.05 M aerated solution of Na2SO4. Our investigations demonstrate that the best protective properties are exhibited by Galvalume coatings, which is explained by the the additional chromate passivation treatment.
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