Anatase titanium oxide coatings with micro-nano structure were prepared on the surface of magnesium alloy vascular stent by solvothermal method. The effects of the solvothermal reaction conditions on the microstructure of the coatings were investiagted. The results show that the titanium oxide coatings with different micro-nano structures can be obtained by changing the reaction time

reaction temperature

HF content and F

-

concentration in the reaction solution. With the reaction time increasing

the coating becomes more denser and the anatase morphology is developed from octahedron to platelike structure. With the increase of reaction temperature

the platelike microstructure is increased with the decrease of the thickness. With the increase of HF content in the solution

the distribution of titanium oxide is gradually sparse and the coating efficiency is decreased. With the F

-

increasing

the arrangement of platelike titanium oxide is tended to be dispersed from multiple overlapping to single. Under the conditions of 160 ℃

10 h

0.25 mL/HF（40%）

0.25 mL/NH

4

F（0.2 mol/L）

the uniform and compact titanium oxide coating with regular lamellar arrangement are obtained on the surface of magnesium alloy vascular stent

and the surface roughness is 350.7 nm.