Al-Zn-Mn-Si-Mg系压铸铝合金阳极氧化工艺

Anodic oxidation process of Al-Zn-Mn-Si-Mg series die-casting aluminum alloy

在传统铝合金阳极氧化电解工艺基础上,添加草酸、酒石酸和柠檬酸等形成硫酸-有机酸混合体系氧化处理液,对Al-Zn-Mn-Si-Mg系压铸铝合金进行阳极氧化处理,探索阳极氧化工艺参数和有机酸种类对氧化膜微观形貌、耐腐蚀和耐磨性能的影响.研究结果表明:在硫酸质量分数为10%、氧化电压为18V、氧化时间为60 min、氧化温度为20℃的条件下,与纯硫酸体系相比,混合酸体系能显著增加Al-Zn-Mn-Si-Mg系压铸铝合金阳极氧化膜厚度,提高氧化膜的耐腐蚀性能和耐磨性能;其中10%硫酸-15%柠檬酸混合体系(百分数均为质量分数,下同)下的氧化膜耐腐蚀性能较强,10%硫酸-10%酒石酸体系下的氧化膜耐磨性能较优.

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.