Electrolyte for preparing porous coating with hierarchical structure on surface of titanium alloy by means of micro-arc oxidation

Abstract

An electrolyte for preparing a porous coating having a hierarchical structure on the surface of a titanium alloy by means of micro-arc oxidation is disclosed. A TiO2 coating having high porosity and a hierarchical structure can be prepared on the surface of the titanium alloy by means of a micro-arc oxidation method based on the electrolyte of the present invention. The electrolyte consists of 0.07-0.15 mol/L tetraborate and 0.10-0.40 mol/L strong base. The tetraborate includes one of Li2B4O7, Na2B4O7 and K2B4O7. The strong base is selected from one of KOH and NaOH. The coating prepared from the electrolyte has a hierarchical structure consisting of interconnected micron grooves or micronpores and randomly distributed nanopores, a layered structure consisting of inner pores and outer slots, high porosity and super-hydrophilicity, and can be used for surface modification in the field of orthopedic materials, dental implants, etc.

1 . An electrolyte for preparing a porous coating on the surface of a titanium alloy by means of micro-arc oxidation, wherein a TiO 2  coating having high porosity and super-hydrophilicity and having a hierarchical structure can be prepared on the surface of the titanium alloy by means of a micro-arc oxidation method based on the electrolyte, wherein the coating has uniformly distributed and interconnected micropores or grooves; the electrolyte includes two parts, i.e. solvent and solutes, wherein the solvent is deionized water, and the solutes are tetraborate and strong base, wherein the molar concentration of the tetraborate is 0.07-0.15 mol/L, and the molar concentration of the strong base is 0.10-0.40 mol/L. 
     
     
         2 . The electrolyte for preparing a porous coating on the surface of a titanium alloy by means of micro-arc oxidation according to  claim 1 , wherein the tetraborate is selected from one of Li 2 B 4 O 7 , Na 2 B 4 O 7  and K 2 B 4 O 7 . 
     
     
         3 . The electrolyte for preparing a porous coating on the surface of a titanium alloy by means of micro-arc oxidation according to  claim 2 , wherein the strong base is selected from one of KOH and NaOH.