论文部分内容阅读
10%H2SO4溶液作为电解液,采用恒电位的方式在纯钛的表面成功制备出阳极氧化膜。采用电化学的方法在3.5%Na Cl溶液中研究了低电位下阳极氧化膜的I-t曲线、Tafel极化曲线、电化学阻抗谱以及Mott-Schottky曲线。结果表明:在确定的工艺参数下,可获得色彩丰富、表面平整、光滑的阳极氧化膜。I-t曲线显示氧化膜的形成是动态生长和溶解的过程;Tafel曲线和阻抗谱显示阳极氧化后的TA2纯钛具有更好的耐蚀性,且阳极氧化电压越高,耐蚀性越好;Mott-Schottky显示阳极氧化膜为n型半导体,且施主浓度随电位升高而减小,耐蚀性随之提高。
10% H2SO4 solution as electrolyte, using a constant potential way on the surface of pure titanium successfully prepared anodized film. The I-t curve, Tafel polarization curve, electrochemical impedance spectroscopy and Mott-Schottky curve of the anodized film at low potential were investigated by electrochemical method in 3.5% NaCl solution. The results show that the anodized film with rich color, smooth surface and smooth surface can be obtained under certain process parameters. It curve shows the formation of oxide film is the process of dynamic growth and dissolution; Tafel curve and impedance spectroscopy shows that the anodized TA2 pure titanium has better corrosion resistance, and the higher the anodic oxidation voltage, the better the corrosion resistance; Mott -Schottky shows that the anodized film is an n-type semiconductor, and the donor concentration decreases as the potential increases, resulting in an increase in corrosion resistance.