Titanium implant with surface coating in crater-like porous shape and preparation method thereof, and implant material

A preparation method of a titanium implant with a surface coating in a crater-like porous shape, comprising the following steps:

• (1) subjecting a titanium substrate to polishing, cleaning, and first drying in sequence to obtain a pretreated titanium substrate;
• (2) conducting micro-arc oxidation by using the pretreated titanium substrate obtained in step (1) as an anode and iron as a cathode in a sodium phosphate-containing electrolyte to obtain the titanium implant with the surface coating in the crater-like porous shape;
• and
• wherein in step (2), the micro-arc oxidation is conducted at a duty ratio of 3% to 5%, wherein the sodium phosphate-containing electrolyte consists of deionized water, sodium phosphate, glycerol, and potassium hydroxide, wherein the sodium phosphate-containing electrolyte has a potassium hydroxide concentration of 2 g/L to 8 g/L, wherein the sodium phosphate-containing electrolyte has a temperature of 15° C. to 20° C., wherein the micro-arc oxidation is conducted at a current of 1.2 A to 1.4A and a working frequency of 400 Hz to 600 Hz for two minutes to four minutes, and wherein in step (1), the polishing is conducted by polishing the titanium substrate with sandpapers of 400 #, 800 #, 1200 #, 2000 #, and 3000 # in sequence.