汽车用6061铝合金柠檬酸阳极氧化工艺的研究

Research on Citric Acid Anodic Oxidation Technology of 6061 Aluminum Alloy for Automobile

对汽车用6061铝合金进行柠檬酸阳极氧化处理。研究发现:铝合金的阳极氧化过程伴随氧化膜的生成和溶解。适当升高氧化温度,有利于增加氧化膜的厚度和硬度。但氧化温度过高,会使得氧化膜的溶解速率加快。铝合金阳极氧化膜呈现典型的多孔结构。40℃下制备的氧化膜表面平整,具有优良的耐蚀性。当氧化温度高于40℃时,氧化膜表面的孔径增大,表面疏松,耐蚀性下降。

6061 aluminum alloy for automobile was treated by citric acid anodic oxidation. It was found that, anodic oxidation process of aluminum alloy accompany with the formation and dissolution of oxidation film. Raising oxidation temperature tended to increase the thickness and harness of oxidation film. However, excessively high temperature may lead to faster dissolution of oxidation film. Oxidation film of aluminum alloy was a kind of typical porous structure. At the temperature of 40 ℃, the oxidation film prepared featuring dense surface and excellent corrosion resistance. When the oxidation temperature was higher than 40℃, the corrosion resistance of oxidation film was weakened due to crumbly surface and larger pore diameter.