磷酸三乙酯对铝合金阳极氧化膜溶胶凝胶封闭性能的影响

Effect of Triethyl Phosphate on Performance of Anodized Aluminum Alloy with Sol-Gel Sealing

制备适用于铝合金阳极氧化封闭的溶胶凝胶封闭液,并研究磷酸三乙酯(TEP)对氧化膜层形貌、耐蚀性和漆膜结合力的影响。采用扫描电子显微镜(SEM)观察膜层的微观结构,应用电化学和盐雾试验方法研究了TEP浓度对于膜层耐蚀性能的影响;使用划格法测试膜层的漆膜结合力。探讨了TEP对溶胶凝胶封闭液的缓释机理和封闭机理。结果显示封闭液中TEP的最佳浓度为2%(质量分数),封闭后阳极氧化膜层均匀致密,具有优于传统重铬酸盐封闭的耐蚀性。

Sol-gel sealing fluids for sealing anodized films of aluminum alloy were fabricated. The effects of triethyl phosphate on per- formance of anodized films with sol-gel sealing on aluminum alloy were studied. The morphology of the films was obtained by scanning electron microscopy （ SEM）. The effects of triethyl phosphate concentration on corrosion resistance of anodized films was investigated by electrochemical impedance spectroscopy （EIS） and salt spray test. The adhesive force between the coating and the anodized films was estimated by scribe test, and the mechanism of corrosion inhibition and sealing evaluated. The results demonstrate that the optimal concentration of triethyl phosphate is 2% （mass fraction） , which makes the films uniform and dense; and demonstrate excellent corrosion resistance.