Method for putting gold color on aluminum material

Abstract

The invention belongs to the field of metal surface treatment and particularly relates to a technology for putting a K gold color (referring to 24K gold color) on the surface of an aluminum material. A method for putting the gold color on the aluminum material comprises the following steps of: placing the aluminum material on which an anode oxidation film is prepared in specific modified solutionfor dipping to enable the porous surface of the oxidation film to be adsorbed with a layer of substances which can realize chemical reaction and can promote electrochemical reaction, and then dippingor conducting electrolytic treatment in acidic solution of coloring additive to obtain a gold color film layer with pure and even color. A composition used in the method is stable and has long service life, the reject rate of the treated aluminum material is extremely low, and the problems of low coloring speed, unstable quality and high cost are ideally solved.

Description

technical field [0001] The invention belongs to the field of fine metal surface decoration, and in particular relates to a metal electrolytic gold coloring process, more specifically, to a metal coloring method with low cost, long service life of bath solution, pure gold color and good uniformity. The invention belongs to the application field of metal surface finishing treatment. Background technique [0002] At present, the coloring film produced is mainly bronze to black. In recent years, due to the diversification of users, there is an urgent need for aluminum materials of other colors. The color similar to 24K gold (referred to as K gold or gold, that is, golden yellow) is particularly popular among users. tone. Various methods have been proposed for the production of golden aluminum. For example: Public Zhao 60-8318 patent proposes to use AgNO 3 —CuSO 4 Mixed salt coloring solution can obtain orange color, but because copper and silver are not deposited in the form...

AI Technical Summary

Problems solved by technology

Liu Mengjun, Jiang Shengjie, and Zhang Xiaojun proposed in CN1251396A and CN1251395A that the titanium gold yellow aluminum alloy coloring processing method and the electrophoresis titanium gold yellow aluminum alloy profile processing method use selenium dioxide as the main salt, and selenium dioxide is very expensive and has a reddish hue , unable to get K gold

CN1059476C adopts the selenium salt coloring additive of composition such as selenium salt and polyethylene glycol, oxide compound, electrolysis realizes the golden yellow coloring of aluminum alloy, but the concentration of acid and oxidizing agent in its used solution is all very high, and energization time is also relatively long, Electrolyzer fluid needs to be replaced very quickly, resulting in increased costs

[0007]2. Due to the coloring reaction of metal oxide MnO4-, the coloring speed is very slow;

[0008]3. When the aluminum profile workpiece is large or complex in shape, the coloring is uneven in the convex and concave positions of the workpiece;

[0009]4. The production quality is not stable, and the bath solution ages very quickly. Every 25M3 bath solution has an average of 300 tons of aluminum coloring and must be discharged once , which not only costs a lot but also pollutes the environment

[0019]H2SO4The higher the KMnO4decomposes faster, the MnO The concentration of 4- drops rapidly, in order to maintain a certain concentration, we must continue to add KMnO4, so that K+ more and more, the increase of K+ will not only delay the coloring speed, but also cause the oxide film to peel off at the origin

[0020]In order to maintain normal coloring, the concentration of KMnO4 must be continuously increased, H2SO4concentration and temperature, so that K+ continues to increase, the coloring speed is slower, and then greatly increase KMnO4, H2 The concentration and temperature of SO4 lead to a vicious circle in the K gold coloring process. When K+ reaches a certain concentration, a large number of colored aluminum materials begin to be scrapped, and only replacement Electrolyte, resulting in a large amount of waste water discharge, cost increase

In order to get out of the vicious circle, it is necessary to develop a new process and bath solution formula. Although people add various additives to the coloring solution, the effect is very small, and the problem has not been solved.

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