| abstract |
A METHOD FOR PRODUCING AN ABRASION RESISTANT ANODIC COATING WITH A DESIRED CORROSION RESISTANT CHARACTERISTIC ON THE SURFACE OF ALUMINUM AND ALLOYS THEREOF COMPRISING THE STEPS OF: (1) INITIALLY ANODIZING THE ALUMINUM MATERIAL IN AN ACID BATH AT CERTAIN CONDITIONS OF TEMPERATURE, CURRENT DENSITY, VOLTAGE ETC., IN ORDER TO PRODUCE A DENSE, HARD ANODIC COATING; (2) SUBJECT THE MATERIAL TO ANOTHER ACID ANODIZING BATH AT CERTAIN TEMPERATURES, CURRENT DENSITY VOLTAGE, ETC., IN ORDER TO DEVELOP A CORROSION RESISTANT ANODIC COATING BETWEEN THE HARD ANODIC COATING AND THE BASE ALUMINUM MATERIAL THEREBY MINIMIZING THE EFFECTS OF THE MICROSPOPIC DISCONTINUITIES, AND THEN (3) SEALING. |