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采用硼酸-硫酸-草酸电解液在铝合金表面制备有序多孔层,研究阳极氧化过程中电流随时间的变化,分析界面反应并计算膜层的生长效率。采用扫描电子显微镜、交流阻抗和动电位极化曲线研究膜层的微结构及其在不同温度环境下的耐蚀性。结果表明:在氧化层界面双离子层浓度的增大有利于提高膜层的生长效率。所制备的阳极氧化膜厚度为8~9μm,孔径为10~14 nm,膜层的微观形貌受金属基体组织结构的影响较大。在沸水封闭后膜层为分层结构,表面呈细片状。氧化膜层封闭后能够明显降低试样的自腐蚀电流密度,且耐蚀性随着环境温度的升高而具有更好的稳定性。
An ordered porous layer was prepared on the surface of aluminum alloy by using boric acid-sulfuric acid-oxalic acid electrolyte. The current change with time was studied in the anodic oxidation process. The interface reaction was analyzed and the growth efficiency of the film was calculated. The microstructure of the film and its corrosion resistance under different temperature environments were studied by scanning electron microscopy, alternating current impedance and potentiodynamic polarization curves. The results show that increasing the concentration of double ion layer at the interface of oxide layer is beneficial to improve the growth efficiency of the film. The prepared anodic oxide film has a thickness of 8 to 9 μm and a pore size of 10 to 14 nm. The microstructure of the film is greatly influenced by the structure of the metal matrix. After the closed water in boiling water layer structure, the surface was fine tablets. After the oxide layer is closed, the self-corrosion current density of the sample can be obviously reduced, and the corrosion resistance has better stability as the ambient temperature increases.