Anodization of AZ91 magnesium alloy in alkaline solution containing silicate and corrosion properties of anodized films

来源期刊：中国有色金属学报(英文版)2008年第3期

论文作者：李玲玲 程英亮 王慧敏 张昭

文章页码：722 - 727

Key words：AZ91 magnesium alloy; anodized coating; corrosion

Abstract: The anodization of AZ91 magnesium alloy in an alkaline electrolyte of 100 g/L NaOH+20 g/L Na₂B₄O₇·10H₂O+50 g/L C₆H₅Na₃O₇·2H₂O+60 g/L Na₂SiO₃·9H₂O was studied. The corrosion resistance of the anodized films was studied by electrochemical impedance spectroscopy(EIS) and potentiodynamic polarization techniques. The microstructure of the films was examined with scanning electronic microscope(SEM) and X-ray diffractometer(XRD). The results show that, under the experimental conditions, the optimum anodizing time and the optimum anodizing current density are 40 min and 20 mA/cm² respectively for obtaining the anodic film with high corrosion resistance. The XRD pattern shows that the components of the anodized film consist of MgO and Mg₂(SiO₄).

基金信息：the National Natural Science Foundation of China