Abstract
Formation behavior and structure of newly established anodic films grown on pure magnesium and AZ alloys were studied in organic electrolyte containing 1 mol·dm−3 triethylamine/ethylene glycol solution with varying water content. The growth behavior and appearance of anodic films were significantly affected by water content. In the region between 10 and 30% of water content, compact barrier-type films were obtained both 99.6% Mg and AZ91D. The surface appearance of obtained films was transparent, which was different from those formed usually in aqueous solutions. In addition, these films possessed a high order of corrosion resistance. In the case of electrolyte containing water below 10% or 50%, the appearances were yellowish white and whitish gray, respectively. The composition of anodic films determined by FT-IR and GD-OES analysis showed the incorporation of organic substance into the anodic film. The amount of incorporated organic species increased with decreasing water content in the electrolyte.
