Anodic oxidation process of Al-Zn-Mn-Si-Mg series die-casting aluminum alloy
Based on the traditional aluminum alloy anodic oxidation and electrolysis process,Al-Zn-Mn-Si-Mg die-casting aluminum alloy was anodized by sulfuric acid-organic acid mixed system oxidation treatment solution by adding oxalic acid,tartaric acid,and citric acid.The effects of anodic oxidation process parameters and types of organic acids on the microstructure,corrosion resistance,and wear resistance of oxide film were investigated.The results showed that under the conditions of sulfuric acid concentration of 10％,oxidation voltage of 18 V,oxidation time of 60 min,and oxidation temperature of 20 ℃,the anodic oxidation film thickness of Al-Zn-Mn-Si-Mg alloy was significantly optimized to improved corrosion resistance and wear resistance by applying the mixed acid system,compared with the pure sulfuric acid system.Among them,the oxidation film under the mixed system of 10％ sulfuric acid-15％ citric acid had a better corrosion resistance,and the oxidation film under the system of 10％ sulfuric acid-10％ tartaric acid had a better wear resistance.
Al-Zn-Mn-Si-Mg series aluminum alloyanodic oxidationorganic acidcorrosion resistancewear resistance
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