为了对硼酸-硫酸阳极氧化膜层性能进行研究,采用硼酸-硫酸阳极氧化工艺在7075、2024、2060三种牌号铝合金基体上制备阳极氧化膜层,并通过配置有EDS的Phenom Pro台式扫描电子显微镜SEM对膜层形貌以及元素分布进行表征,通过接触角测量仪Germany Dataphysics OCA50测试膜层亲水性,通过ASTM B 117循环腐蚀盐雾箱进行中性盐雾试验测试耐腐蚀性能,采用湿性划格法测试油漆附着力.试验结果表明:硼酸-硫酸阳极氧化制备得到的氧化膜层连续平整,与基体结合良好,厚度分别为1.84μm、1.36 μm、1.14 μm;阳极氧化膜层耐腐蚀性能较好,经过336h盐雾试验后,仅出现点蚀,且点蚀数量均小于5;阳极氧化膜层油漆结合力良好,划痕试验后7075、2024铝合金未出现掉漆现象,2060铝合金出现零星点状掉漆现象.硼酸-硫酸阳极氧化膜层具有优异的综合性能.
Study on the performance of boric acid-sulfuric acid anodic oxide film of aluminum alloy
In order to study the performance of boric acid-sulfuric acid anodic oxidation layer,the anodic oxidation layer was prepared by boric acid-sulfuric acid anodic oxidation process on three kinds of aluminum alloys,namely,7075,2024,and 2060,and the morphology of the layer as well as the elemental distribution was characterized by Phenom Pro benchtop scanning electron microscope SEM configured with EDS,and the hydrophilicity of the film layer was tested by contact angle measuring instrument Germany Dataphysics OCA50,and the adhesion of paint was tested by neutral salt spray test by ASTM B 117 cyclic corrosion salt spray chamber.The results of performance test show that:the oxidized layer prepared by boric acid-sulfuric acid anodic oxidation was continuous and smooth,with good combination with the substrate,and the thicknesses is 1.84 pm,1.36 pm and 1.14 pm.the hydrophilicity of 7075 aluminum alloy deteriorates,while the hydrophilicity of 2024 and 2060 aluminum alloy becomes better.The corrosion resistance of the anodic oxidation layer is better.After 336 h salt spray test,only pitting corrosion occurs and the number of pitting corrosion is less than 5.The anodic oxidation membrane layer has a good combination of paint,and there is no paint loss in 7075 and 2024 aluminum alloys and sporadic spot paint loss in 2060 aluminum alloy after scratching test.The boric acid-sulfuric acid anodic oxide layer has excellent comprehensive performance.