PROCESS FOR COLORING ALUMINUM AND ALLOYS OF ALUMINUM HAVING AN ANODIZED SURFACE

摘要

Procedure for coating aluminum objects, or aluminum alloys, by a colored protective layer of uniform dye, characterized in that it comprises: - forming on the object a porous layer of alumina by anodizing; - give it a provisional tint by depositing in the pores of this alumina layer colored particles of a metallic compound by electrolysis in alternating current in a bath containing in solution a salt of the metal that constitutes the particles; - then modify this provisional dye by placing the object as an anode of an electrolysis cell fed with direct current or with unfiltered rectified current whose electrolyte is an aqueous solution of thiosulfate; - fix the final dye by fusing the alumina layer with boiling water. (Machine-translation by Google Translate, not legally binding)