Lightly being the method of forming the membrane on the surface of the metal type backing material lightly with the membrane

摘要

PROBLEM TO BE SOLVED: To provide a method of forming a film by plasma electrolytic oxidation, wherein the film formed on the surface of a substrate made of light metal, especially magnesium or magnesium alloy improves corrosion resistance and furthermore acts as a living body compatible protective layer while appropriately controlling the deterioration of the substrate.;SOLUTION: In the plasma electrolytic oxidation, the substrate is dipped in an electrolyte liquid together with a counter electrode and potential enough to generate spark discharging is applied on the surface of the substrate. The electrolyte contains scattered clay particles. The layer is amorphous. The substrate may be used for any mechanical part, vehicle part, railway part, aircraft part, ship part or the like, and living body implant such as bone substitution material, or for medical bone screw formed of light metal such as magnesium or magnesium alloy.;COPYRIGHT: (C)2013,JPO&INPIT