Adsorption orientation of sodium of polyaspartic acid effect on anodic films formed on magnesium alloy

► The PASP concentration affects the anodizing process greatly. ► Increasing the PASP concentration ranging from 19.2 g/L to 28.8 g/L results in enhancing the corrosion performance. ► The anodic film consists of MgO and Mg2SiO4. ► The anodizing process is regulated by two main plausible adsorption orientations of PASP including “end-on” and “flat-on”.