The invention discloses an electrochemical method for preparing a
fluorine-containing hydroxyapatite / zirconia transition
coating on the surface of medical
titanium. The method comprises the steps that: electro-deposition is carried in an electrolytic tank with a three-
electrode system, wherein a medical
titanium chip is adopted as a
working electrode; a Zr(OH)4 plating is deposited in a zirconyl
nitrate solution with a certain concentration and a certain pH value, wherein the deposition current is 11.1mA and the deposition time is 40s; a
fluorine-containing hydroxyapatite (FHA) plating is deposited in an
electrolyte which has a certain concentration and a certain pH value and which is composed of
calcium nitrate,
ammonium dihydrogen
phosphate, and
sodium fluoride, wherein the deposition current is 0.8mA and the deposition time is 3600s; and
vacuum sintering is carried out under a temperature of 450 DEG C, such that the FHA / ZrO2 transition
coating is obtained. According to the invention,
fluorine partially substitutes hydroxyl group in
apatite, fluorine ions are smaller than hydroxyl groups, and FHA
lattice constant is small, such that FHA
solubility is lower than HA. A
coating morphology is changed from a micron-level chrysanthemum
petal shape into a nano-level cone shape. With an
antibacterial effect of F ions, dental caries can also be prevented. ZrO2 serves as a
transition layer between the
titanium substrate and the FHA coating, and the
bonding strength between the FHA / ZrO2 transition coating and the Ti substrate is greatly improved. The
bonding strength between the FHA / ZrO2 transition coating and the titanium substrate is high, a physiological
solubility resistance is high, and antibacterial performance is good. The provided product has certain potential to be developed into an oral medical material with good development prospect.