The Research on Process of Impact Factors of Hard Anodic Oxidation for 6061 Aluminum Alloy

In order to improve the performance of hard anodic oxidation film of the 6061 aluminum alloy the significantly influential factors were screened by orthogonal test at room temperature. The results showed that the significant factors which contribute to increase the anode oxidation film hardness were as follows: malic acid, lactic acid, current density, sulfosalicylic acid, triethanolamine, sulfuric acid and oxidation time. And with the decreasing of malic acid, lactic acid, current density, sulfosalicylic acid, sulfuric acid and oxidation time, with the increasing of triethanolamine, the hardness of oxide film increased. We can rank these significant factors which are in favor of increasing anode oxidation film corrosion resistance by its effects as follows: current density, oxidation time, sulfosalicylic acid, sulfuric acid, aluminum sulphate and concentration of triethanolamine. Also as the current density, oxidation time and triethanolamine concentration increased, as the sulfosalicylic acid, sulfuric acid, aluminum sulfate concentration decreased, the corrosion resistance of oxide film was improved.