Process for coloring titanium alloy through micro-arc oxidation

Abstract

The invention belongs to the field of metal coloring and dyeing in a surface treatment technology and specifically relates to a process for coloring titanium alloy through micro-arc oxidation. The method provided by the invention is used for overcoming the shortcomings of the electrolyticaly colored film. The process is characterized in that two-way square waves are employed for coloring through micro-arc oxidation, the frequency of the pulse waveform ranges from 150 Hz to 1700 Hz, the positive current density ranges from 5 A / dm<2> to 15 A / dm<2> and the positive current density also ranges from 5 A / dm<2> to 15 A / dm<2>, the positive duty ratio is 10%-50% and the negative duty ratio is also 10%-50%, and the micro-arc oxidation coloring time is 3-20 minutes. The process is capable of directly forming a bright, fine colored ceramic layer on a titanium alloy substrate through a micro-arc oxidation technique. The decorative ceramic layer produced by the process is especially suitable for the titanium alloy products with high-grade decorative requirements and the film is resistant to corrosion, heat, ultraviolet light, wearing and the like, and simultaneously capable of keeping the metal luster, thereby actually achieving the decoration effect of the colored film. The film is characterized by the ceramic layer with the special color and luster.

Description

Technical field [0001] The invention belongs to the field of metal coloring and dyeing in surface treatment technology, and relates to a process method for directly producing a colored ceramic layer on a titanium alloy substrate through a micro-arc oxidation coloring process for titanium alloy parts. Background technique [0002] Metal coloring and dyeing refers to the process of making the surface of the metal produce a different color tone from the original and maintaining the metallic luster. The current coloring of titanium alloys uses an electrolytic coloring process. For example, the coloring process method of the patent No. 102080247 smoke yellow titanium alloy is the electrolytic coloring process. Titanium alloy electrolytic coloring, the film thickness is less than 1 micron, it is not abrasion resistant, it is easy to produce discoloration when touched by hand, and it is easy to adsorb stains. Above 200℃, the film cannot prevent the titanium matrix from oxidizing and dis...

AI Technical Summary

Problems solved by technology

However, in the process of electrolytic oxidation, its color will undergo a series of continuous changes, and it is not wear-resistant. It is easy to discolor and absorb stains when touched by hand. When the temperature is above 200 ° C, the film layer cannot prevent the titanium substrate from being oxidized and discolored.