Anodizing coloring method for titanium-magnesium alloy

Abstract

The invention discloses an anodizing coloring method for a titanium-magnesium alloy. The method comprises steps as follows: (1), pretreatment; (2), anodizing: an anodizing solution is prepared from 20-60 parts by weight of potassium dichromate, 10-30 parts by weight of chromate, 10-20 parts by weight of sulfate, 10-50 parts by weight of sulfuric acid, 2-4 parts by weight of a blackening solution, 25-40 parts by weight of phosphoric acid, 20-40 parts by weight of phosphate, 1-10 parts by weight of acetic acid, 10-20 parts by weight of ethylene glycol, 15-30 parts by weight of sodium gluconate and 700-1,000 parts by weight of distilled water through mixing, a sample is taken as a working electrode, graphite is taken as an auxiliary electrode, the working electrode and the auxiliary electrode are completely soaked in the anodizing solution for anodizing; (3), follow-up treatment. The method is simple and easy, oxidation films with different thicknesses and good compactness can be obtained by controlling different voltage values, pH values of the anodizing solution and power-on time, and the market requirement of anodizing for metal surface treatment is met.

Description

technical field [0001] The invention relates to the technical field of anodic oxidation for metal surface treatment, in particular to a method for anodic oxidation and coloring of titanium-magnesium alloys. Background technique [0002] In recent years, titanium and titanium alloys have attracted more and more attention because of their unique properties, so they are widely used in various fields such as national defense cutting-edge technology, civil industry, and people's livelihood products. For example: in aerospace, titanium and titanium alloys are used in the production of new-generation aircraft due to their small specific gravity, light weight, and high specific strength; in medicine, titanium and titanium alloys have good corrosion resistance and good biocompatibility. With low human repellency, it is widely used in medical fields such as tooth and bone implants, and intravascular stents, and has become an eye-catching biometal material; in construction, due to the ...

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Problems solved by technology

[0008] (3) The surface energy of the anodized film is high, and the surface of the film is easy to absorb dirty substances and be polluted, and it is easy to cause fingerprint pollution to change the color; in addition, it is difficult to recover after being polluted, which affects its appearance and decorative effect;

[0009] (4) The compactness of the anodized film is poor, often due to the oxide film on the surface of the substrate, the combination of the anodized film and the oxide film on the surface of the substrate is not firm, and it is easy to fall off

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