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

作者：Li Ling-ling; Cheng Ying-liang^*; Wang Hui-min; Zhang Zhao

来源：Transactions of Nonferrous Metals Society of China, 2008, 18(3): 722-727.

DOI：10.1016/S1003-6326(08)60124-7

• AZ91 magnesium alloy
• anodized coating
• corrosion

The anodization of AZ91 magnesium alloy in an alkaline electrolyte of 100 g/L NaOH+20 g/L Na2B4O7 center dot 10H(2)O+50 g/L C(6)H(5)Na(3)O(7 center dot)2H(2)O+60 g/L Na2SiO3 center dot 9H(2)O 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/cm(2) 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 Mg-2(SiO4).

• 出版日期2008-6
• 单位湖南大学; 浙江大学