Method for extinction electrophoresis of aluminum alloy section

Abstract

The invention relates to a method for extinction electrophoresis of an aluminum alloy section. The method comprises the following steps: (a) soaking the aluminum alloy section into an acid solution, an alkaline solution and water in sequence to remove grease on the surface; (b) performing anodic oxidation on the aluminum alloy section without the grease to from an oxide film on the surface of the aluminum alloy section; (c) soaking the aluminum alloy section after the anodic oxidation into a solution containing nickel sulfate and stannous sulfate, and electrifying for coloring; (d) soaking the colored aluminum alloy section into electrophoretic paint, and electrifying for electrophoresis; and (e) heating the aluminum alloy section after electrophoresis at 170-220 DEG C for 10-50 minutes. The aluminum alloy section after the anodic oxidation is soaked into the solution containing nickel sulfate and stannous sulfate to perform electrified coloring, so that a black extinction film layer can be formed on the surface of the aluminum alloy section, thereby avoiding light pollution generated by formation of an aluminum alloy.

Description

technical field

[0001] The invention belongs to the field of electrochemistry, and in particular relates to an aluminum alloy profile extinction electrophoresis method. Background technique

[0002] Aluminum alloy is an extended product of pure aluminum, which has a low density (ρ=2.7g / m 3 ), which is about 1 / 3 of that of iron, and has a low melting point, about 660°C. Aluminum has a face-centered cubic structure, so it has high plasticity (δ: 32~40%, ψ: 70~90%), so It is easy to process, can be made into various profiles and plates, and has good corrosion resistance.

[0003] The surface of aluminum alloy is relatively smooth, which is easy to reflect light and produce photochemical pollution. Electrophoretic paint film is a commonly used matting method, which has the advantages of full, uniform, smooth and smooth coating, and the hardness, adhesion, corrosion resistance, impact performance and permeability of electrophoretic paint film are obviously better than other co...