Novel pretreatment method for anodic oxidation process

Abstract

The invention provides a novel anodic oxidation pretreatment method, and relates to treatment methods for biomedical materials, in particular to surface pretreatment before anodic oxidation for titanium and titanium alloy preparation. The novel pretreatment method comprises the step that carbon dioxide ice particle jet treatment is conducted on the surface of a matrix, specifically, (1-1) carbon dioxide ice particles are treated by changing the size of the carbon dioxide ice particles or by changing both the size and shape of the carbon dioxide ice particles, and (1-2) the carbon dioxide ice particles are sprayed onto the surface of the matrix, so that the surface of the matrix is purified and coarsened. According to the novel pretreatment method, an existing carbon dioxide jet cleaning process is improved, an existing sand-blasting / centrifugal grinding process is replaced, and even the activation procedure can be omitted; by using the carbon dioxide ice particle jet cleaning techniquefor treatment, it is found that the quantity of broken abrasive particles left on the surface of the matrix is greatly reduced, and interface pollution is basically eliminated. Obvious broken abrasive particle residues on an interface are avoided while the surface of the matrix is purified and coarsened, and thus, secondary interface pollution is greatly reduced; and the quality and bonding strength of the film interface are improved, and the service life of the film interface is prolonged.

Description

technical field [0001] A novel anodic oxidation pretreatment method of the invention relates to a treatment method for biomedical materials, especially the surface pretreatment before anodic oxidation of titanium and titanium alloys. Background technique [0002] Titanium and titanium alloys are widely used as biomedical materials due to their good biocompatibility, especially in the field of implants. Higher biocompatibility stems from the fact that titanium and titanium alloys can spontaneously form a stable and protective oxide film during use. In addition, from a structural point of view, the density of titanium and titanium alloys is about 4.5 grams per cubic centimeter, which is only half that of steel. At the same time, it has high specific strength and high specific stiffness, so titanium and titanium alloys are currently the preferred materials for implant materials. [0003] For the processing of implant products in the current medical device field, in most cases...

AI Technical Summary

Problems solved by technology

[0011] 2) Reduce the interface bonding strength between the substrate and the film layer

[0012] 3) Influence the stress field at the film / substrate interface, resulting in local film shedding

However, due to the pressure of dry ice particle cleaning and the small size of dry ice particles, the surface roughness achieved is often small, which cannot meet the roughness requirements required by the product.

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