seen to treat the surfaces of aluminium or aluminium alloys by electrolytic paforing of a layer of a copper indiumlegering and a efterfoljande diffusionsvermebehandling

摘要

The surface of aluminium or an aluminium alloy is treated by electrolytic deposition of a copper-indium alloy surface layer followed by the diffusion heat treatment of the coated surface. Electrolysis is carried out in a bath containing, in an aqueous alkaline solution, monovalent copper ions, trivalent indium ions, an alkali metal hydroxide, an alkali metal cyanide, an alkali metal gluconate, gluconic acid, and oxalic acid, and the heat treatment is carried out at between 120 DEG and 155 DEG C.