Preparation method of titanium alloy surface coating with low solar absorptivity and high emissivity

The invention relates to a preparation method of a titanium alloy surface coating with low solar absorptivity and high emissivity, and relates to a preparation method of a titanium alloy surface coating. The titanium alloy surface coating provided by the invention is used for solving the problems of high solar absorptivity, low emissivity and poor binding force with a substrate and thermal stability of the titanium alloy material. The preparation method comprises the following steps of: 1, polishing and cleaning titanium alloy; and 2, carrying out micro-arc oxidation. The coating prepared by the invention is white or grey white in appearance, uniform and attractive; the thickness of the coating is up to 30-120 mu m and can be adjusted; due to in-situ growth, the coating has good binding force and thermal shock resistance; furthermore, the solar absorptivity is 0.35-0.6; the emissivity is 0.8-0.95; the coating is a thermal control coating with low solar absorptivity and high emissivity and is good in performan