Process for electrolytic colouring, by optical interference, the anodic oxide on aluminum and aluminum alloys.

摘要

Process for electrolytic colouring ("electrocolouring") aluminum and its alloys by optical interference, which process comprises the steps of pickling and neutralization of material surface, anodic oxidizing, modification of oxide layer by anodizing in phosphoric acid, acidic conditioning of said modified oxide layer, electrolytic colouring and fixation. <IMAGE>