New anodizing process for magnesium alloys

来源期刊：中南大学学报(英文版)2006年第2期

论文作者：罗胜联 戴磊 周海晖 柴立元 旷亚非

文章页码：141 - 145

Key words：magnesium alloys; anodizing; film; arc-free; corrosion resistance

Abstract: Compact anodic films with high hardness and good corrosion resistance on magnesium alloys were prepared by a new constant voltage and arc-free anodizing process. The effects of anodizing parameters such as applied voltage and electrolyte temperature on the peak current density and the thickness of films were investigated. In addition, the morphologies and corrosion resistance of films were investigated by scanning electron microscopy and potentiodynamic polarization, respectively. The results show that the higher the applied voltage, the higher the peak current density and the thicker the films. However, too high applied voltage may result in breakdown of films and intense sparking which may deteriorate the properties of the anodic films and bring about unsafety. The new anodizing process can be applied in a wide range of temperature. The new anodic films have numbers of pores with the diameter of 0.5-5.0μm which do not transverse the entire film.