Method for preparing titanium dioxide nano tube array on titanium-substrate material surface

Abstract

The invention discloses a method by which titanium dioxide nanometer tube array layer is prepared on surface of titanium base material, wherein the titanium base materials undergo the surface pretreatment and receive the electrochemistry anodic oxidation treatment in the electrolyte containing the HF acid, the components of the mixed electrolyte are that the ammonium dihydrogen phosphate is 1 to 3mol / L and the hydrofluoric acid is 0.2 to 0.4mol / L, as a result, the amorphous form titanium dioxide nanometer tube surface structure is achieved; the subsequent heat treatment condition is that under air atmosphere, the rate of temperature rise is 3 DEG C / min, the heat is preserved for 3 hours at the temperature of 450 DEG C, the anatase titanium dioxide nanometer tube array layer is achieved after being cooled in the furnace to the room temperature. The electrolyte system prepared based on the method of the invention can control the balance of oxidation and the corrosion within a relatively long time, thereby preferably realizing the control on the shape of the titanium dioxide nanometer tube. The invention has the advantages of easy operation, low cost and orientated and order distribution of the prepared titanium dioxide nanometer tube array; moreover, the amorphous form titanium dioxide nanometer tube is generated normal to the direction of the base; the tube diameter is 80 to 100nm, the wall thickness is 18 to 21nm, the tube length is 0.7 to 2.0um, thereby the specific surface area is large.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a method for preparing a titanium dioxide nanotube array layer on the surface of pure titanium or titanium alloy. Background technique [0002] Titanium and titanium alloys are light in weight, high in strength and good in corrosion resistance, and have been widely used in aerospace, machinery manufacturing, biomedical materials and other fields. However, when it is used, it is often necessary to modify its surface. The purpose is to obtain a surface with better performance, such as laser melting TiN and TiC to improve its hardness and wear resistance; to improve the titanium surface by depositing a coating. Excellent corrosion resistance, high temperature resistance and wear resistance; the microstructure of titanium surface can be changed by surface nanometerization, and the mechanical properties can be improved. [0003] Titanium dioxide is an important inorganic functional...

AI Technical Summary

Problems solved by technology

However, in the currently reported methods, there are usually disadvantages of high electrolyte cost and inconvenient process operation.

Chinese patent application 200510125502.8 uses simple HF acid as the electrolyte, the system is single, the pH value drops quickly, the time for oxidation and corrosion to reach equilibrium is short, and it is difficult to increase the length of nanotubes and control the shape of nanotubes