GREEN SEALING METHOD OF ANODIC ALUMINA FILMS

A green sealing method of anodic films on aluminum alloy L3 was studied to eliminate the toxic materials.The new process uses chemical treatments in cerium solution and an electrochemical treatment in a molybdate solution.Potentiodynamic polarization was used to study the influences of sealing methods on the corrosion behavior of anodic films in NaCl solutions.The Ce-Mo sealing made the surface structure and morphology of anodic films uniform and compact.Ce and Mo produced a cooperative effect to improve the corrosion resistance of anodic films.Anodic films sealed by Ce-Mo provided high corrosion resistance in NaCl solutions.