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使用铝合金在硼-硫酸-草酸电解液中阳极氧化制备有序多孔层。初步探讨了恒流和降压阳极氧化过程膜层生长机理,采用扫描电镜(SEM)观察膜层微观形貌,结合电化学阻抗和动电位极化曲线研究不同阳极化工艺制备膜层试样在3.5%NaCl溶液中的耐蚀行为。结果表明,采用三段变压方式制备的阳极氧化膜表面孔密度降低,孔壁增厚,孔径为10~13 nm。疏孔膜层的电化学行为表明孔壁及膜层厚度增大能提高试样电荷传递电阻和耐蚀性能。
An ordered porous layer was prepared by anodic oxidation of an aluminum alloy in a boron-sulfuric acid-oxalic acid electrolyte. The mechanism of film growth in constant current and step-down anodization process was discussed preliminarily. The microstructure of the film was observed by scanning electron microscopy (SEM). The electrochemical impedance and potentiodynamic polarization curves were used to study the effects of different anodizing processes Corrosion behavior in 3.5% NaCl solution. The results show that the surface pore density of the anodized film prepared by the three-stage transformation is decreased, and the pore wall is thickened with a pore size of 10-13 nm. The electrochemical behavior of the hydrophobic film shows that the increase of pore wall and film thickness can improve the charge transfer resistance and corrosion resistance of the sample.