6063铝合金阳极氧化膜腐蚀性能的正交试验研究

Study on corrosion behavior of anodic oxide film on 6063 aluminum alloy

用硫酸直流阳极氧化法对6063铝合金表面进行处理。采用正交试验研究方法探索腐蚀时间、温度和腐蚀液浓度对氧化膜抗蚀性能的影响,运用极差分析法对6063铝合金的腐蚀增重量和最大腐蚀深度进行了分析。结果表明:在铜加速乙酸盐雾环境下,时间对腐蚀的影响最强,温度及盐溶液浓度的影响均较小。合金的阳极氧化膜主要以点蚀为主,在72h、35℃、3%盐溶液浓度条件下,最大蚀坑深度达180.79μm,而原样则是以均匀腐蚀为主,可见与点蚀相比,阳极氧化膜对于均匀腐蚀的改善作用更明显。

By using the method of sulfuric acid DC anodic oxidation, the surface of 6063 Aluminum Alloy is strengthened. The influence of corrosion time, corrosion temperature and the concentration of the etching solution to the corrosion resistance of oxide film is analyzed by orthogonal experiment. The weight increase and deepest pitting of 6063 Aluminum Alloy is analyzed by the range analysis. It is shown that the biggest influencing factor of the corrosion behavior of 6063 Aluminum Alloy is corrosion time, followed by the temperature and then the concentration of the etching solution under the condition of copper accelerated acetic acid salt spray corrosion. The main feature of aluminum alloy after anodizing is pitting and the deepest pitting is 180.79μm under the condition of 72h,35℃ ,3% etching solution concentration. But that of original sample is uniform corrosion. Therefore, the improvement of anodic oxidation film to uniform corrosion is more than that of pitting.