DIRECT DYEING ANODIC OXIDATION PROCESS FOR PRODUCING BLUISH-GREY, CORNFLOWER BLUE, GREYISH-BLUE, DARK BLUE OXIDE LAYER OR OF ITS OWN GREY COLOUR, ON ALUMINIUM OR ITS ALLOYSThe electrolyte comprises (g/l): 20-250 sulphuric acid, 0.1-30 alkaline hexacyano-ferrate (III). 0.1-10 hydrogen ...
DIRECT DYEING ANODIC OXIDATION PROCESS FOR PRODUCING BLUISH GREY, CORNFLOWER BLUE, GREYISH BLUE, DARK BLUE OR THE OWN GREY COLOURED OXIDE LAYER ON ALUMINIUM OR ITS ALLOYSThe electrolyte comprises (g/l): 20-250 sulphuric acid, 0.1-30 alkaline hexacyano-ferrate (III). 0.1-10 hydrogen peroxide,...