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Composite oxidation technology for medicinal titanium alloy

A composite oxidation and titanium alloy technology, which is applied in the field of composite oxidation technology, can solve the problems of poor bonding between the oxide layer and the titanium alloy base material, affecting the biocompatibility and corrosion resistance of titanium alloys, and achieve low cost and low equipment investment. The effect of small size and simple process

Inactive Publication Date: 2011-01-12
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the wear resistance of titanium alloy is improved by increasing its thickness, it will seriously affect the biocompatibility and corrosion resistance of titanium alloy itself
[0006] 3) Electrochemical method A layer of oxide film is formed on the surface of titanium alloy by chemical method. Although the corrosion resistance is improved, the bonding force between the oxide layer and the titanium alloy base material is poor

Method used

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  • Composite oxidation technology for medicinal titanium alloy
  • Composite oxidation technology for medicinal titanium alloy
  • Composite oxidation technology for medicinal titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, medical titanium alloy (Ti-6Al-4V) is used as the base material.

[0027] Firstly, the annealed Ti-6Al-4V alloy is first mechanically polished, then polished smooth with metallographic water sandpaper (500#, 1000#, 2000#), washed with distilled water, then ultrasonically cleaned in acetone for 10 minutes, and then degreased Carry out chemical degreasing in the liquid for 10 minutes, rinse with distilled water and blow dry, and then put a certain molar ratio of NH 4 HF 2 : HNO 3 :H 2 o 2 (1:2:2) acidic solution for activation for 1min, and finally put the titanium alloy sample into the solution at a constant temperature of 25°C to form NH 4 h 2 PO 4 : 60g / L; CH 3 COONH 4 : 20g / L; H 2 o 2 : 20mL / L; sodium gluconate: 2g / L; surfactant sodium dodecylbenzenesulfonate: 2g / L; pH: 6.8 electrolyte solution as working electrode, stainless steel as auxiliary electrode, saturated calomel electrode Constitute a three-electrode system for the reference e...

Embodiment 2

[0029] In this embodiment, the medical titanium alloy bone nail is used as the base material.

[0030] Firstly, the medical titanium alloy bone nails are polished by sandblasting, cleaned with distilled water, ultrasonically cleaned in acetone for 10 minutes, then chemically degreased in a degreasing solution for 10 minutes, rinsed with distilled water and dried, and then placed in a certain molar ratio to NH 4 HF 2 : HNO 3 :H 2 o 2 (1:2:2) acidic solution for activation for 1min, and finally put the titanium alloy sample into the solution at a constant temperature of 25°C to form NH 4 h 2 PO 4 : 50g / L; CH 3 COONH 4 : 25g / L; H 2 o 2 : 20mL / L; sodium gluconate: 2g / L; surfactant sodium dodecylbenzenesulfonate: 2g / L; pH: 6.8 electrolyte solution as working electrode, stainless steel as auxiliary electrode, saturated calomel electrode Constitute a three-electrode system for the reference electrode, the area of ​​the cathode and anode is controlled at 5:1, and the voltag...

Embodiment 3

[0032] In this embodiment, the medical titanium alloy bone plate is used as the base material.

[0033] Firstly, the medical titanium alloy bone plate is polished by sandblasting, cleaned with distilled water, then ultrasonically cleaned in acetone for 10 minutes, then chemically degreased in degreasing solution for 10 minutes, rinsed with distilled water and dried, and then placed in a certain molar ratio to NH 4 HF 2 : HNO 3 :H 2 o 2 (1:2:2) acidic solution for activation for 1min, and finally put the titanium alloy sample into the solution at a constant temperature of 25°C to form NH 4 h 2 PO 4 : 50g / L; CH 3 COONH 4 : 25g / L; H 2 o 2 : 20mL / L; sodium gluconate: 2g / L; surfactant sodium dodecylbenzenesulfonate: 2g / L; pH: 6.8 electrolyte solution as working electrode, stainless steel as auxiliary electrode, saturated calomel electrode Constitute a three-electrode system for the reference electrode, the area of ​​the cathode and anode is controlled at 5:1, and the vol...

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Abstract

The invention relates to composite oxidation technology for medicinal titanium alloy, belongs to the technical field of chemical treatment on metal surfaces, and aims to improve the corrosion resistance and abrasion resistance of an oxidation layer on the surface of the medicinal titanium alloy. The method comprises two key processes: 1, anodic oxidation technology on the surface of the titanium alloy; and 2, thermal oxidation technology on the surface of the titanium alloy. The method comprises the following steps of: performing surface finish, alkaline wash and activation on the titanium alloy, and performing anodic oxidation by using mixed solution of ammonium phosphate, ammonium acetate and hydrogen peroxide as electrolyte; drying and performing thermal oxidation in the atmosphere of nitrogen and oxygen according to a certain ratio, and controlling the temperature to be between 500 and 700 DEG C. The provided method has the advantages of simpleness, easy implementation, no damage to mechanical properties of titanium alloy materials, no environmental pollution, application to mass production and great reduction of cost.

Description

technical field [0001] The invention relates to a composite oxidation process for surface treatment of medical titanium alloys, belonging to the technical field of surface treatment production of medical titanium alloys. Background technique [0002] Titanium alloys are mainly used as load-bearing hard tissue substitute materials. They are in long-term contact with body fluids and subjected to periodic mechanical loads, which are prone to metal corrosion, wear and other problems. Komotori et al. found that the wear and corrosion of titanium alloys in body fluids occurred simultaneously, and as the scratch rate increased, the corrosion current also increased, inducing corrosion. Titanium alloy artificial joints will produce 3.8 mg of wear debris after 1 million human walking loads. These wear debris will cause infection when in contact with tissues, causing tissue necrosis and resulting in implant failure. Due to the lack of certain physical properties, the popularization an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 杨玉洁成旦红彭根生曹铁华吕经康
Owner SHANGHAI UNIV
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