Process for electrocolouring, by optical interference, aluminium and aluminium alloys, suitable to obtain homogeneous and easily reproducible colourings.

摘要

A process for electrocolouring aluminium and its alloys by optical interference, which process comprises the following stages: anodic oxidation; modification in phosphoric acid; possible conditioning by treatment with diluted acids; electrocolouring by means of a solution in which the concentration of colouring metal is comprised between 0.018 and 0.1 moles/l; and final fixing.