Anodic films formed on magnesium in organic, silicate-containing electrolytes

Anodic films were prepared on magnesium in electrolyte solutions consisting of 3.0 M KOH and various concentrations of sodium silicate and aqueous ethylene-glycol solutions. The anti-corrosion properties of the films formed in the ethylene-glycol electrolyte solutions ranging from 10 to 40 wt% far exceeded that of the anodic film produced using the HAE method. The film formed under optimal conditions had excellent anti-corrosion properties, which were more than 10-fold greater than those of the HAE anodic films. The anodic film consisted of two layers—a heterogeneous porous layer and a barrier layer; moreover, both carbon and silicate were detected in the anodic film.