Titanium alloy is a very promising material. Titanium alloys have high chemical activity and are highly susceptible to hydrogen and nitrogen contamination at high temperatures. Titanium alloy has low hardness, poor wear resistance, and its own potential is relatively positive. It is easy to cause contact corrosion when it is in contact with other materials, and it is sensitive to hydrogen embrittlement and cadmium brittleness. To solve the shortcomings in the performance of titanium alloys. Titanium alloy surface treatment methods include chemical conversion coating treatment, anodizing, electroplating, thermal diffusion, surface deposition, laser surface treatment, and ion implantation. Among them, anodizing and functional plating are more commonly used.

The color of titanium anode oxide is caused by the different thickness of oxide layer and the different interference to light.The thickness of oxide layer is affected by voltage.Color of titanium oxide anodized at different voltages

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