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通过正交试验优选了5052铝合金的无铬化学氧化工艺,采用划格法、盐雾试验、电化学阻抗谱、极化曲线等方法分析了所得氧化膜的性能。结果表明,无铬化学氧化较优工艺为:铵盐A1.5g/L,磷酸三钠1.0g/L,氟硅酸钠0.5g/L,柠檬酸钠0.5g/L,乙酸钠0.3g/L,pH5.5,氧化温度30°C。采用该工艺后,所得氧化膜层与铝合金基体结合良好,明显改善了铝合金基体的耐腐蚀性能。
Through orthogonal experiments, the chromium-free chemical oxidation process of 5052 aluminum alloy was optimized. The properties of the obtained oxide film were analyzed by cross-hatching method, salt spray test, electrochemical impedance spectroscopy and polarization curves. The results showed that the optimum conditions of chromium-free chemical oxidation were ammonium salt A1.5g / L, trisodium phosphate 1.0g / L, sodium fluorosilicate 0.5g / L, sodium citrate 0.5g / L, sodium acetate 0.3g / L, pH5.5, oxidation temperature 30 ° C. After the process is adopted, the obtained oxide film layer is well combined with the aluminum alloy substrate, and the corrosion resistance of the aluminum alloy substrate is obviously improved.