Study of anodizing behavior and corrosion resistance of 7050 T7451 alloy

The anodic film could be hardly formed on the surface of the 7050 T7451 Al alloy in chromic acid with the conventional method. In order to find a proper anodizing method, the effects of the anodizing voltage and the so-called deoxidization were studied. It was found that the suitable voltage was >30 V for this alloy anodized in chromic acid, and the deoxidisation worsened the corrosion resistance of the alloy. The corrosion route of the alloy bearing anodic film was pitting — intergranular corrosion — exfoliation.