Medical metal titanium or titanium alloy surface composite anticorrosive coating and preparation method thereof

A technology of anti-corrosion coating and surface compounding, applied in surface reaction electrolytic coating, anti-corrosion coating, coating and other directions, can solve the problems of poor adhesion between coating and substrate, uneven surface coating, difficult process control, etc. Achieve the effect of improving anti-corrosion performance, reducing elastic modulus and hardness, and strong operability

Active Publication Date: 2019-10-22
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used metal surface coating construction methods mostly adopt magnetron sputtering method, plasma spraying method, sol-gel method, liquid phase deposition method, etc., but these methods re

Method used

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  • Medical metal titanium or titanium alloy surface composite anticorrosive coating and preparation method thereof
  • Medical metal titanium or titanium alloy surface composite anticorrosive coating and preparation method thereof
  • Medical metal titanium or titanium alloy surface composite anticorrosive coating and preparation method thereof

Examples

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Example Embodiment

[0024] Example 1

[0025] The preparation method of the composite anticorrosive coating on the surface of medical titanium or titanium alloy, the steps are as follows:

[0026] Step 1: Use metallic titanium or titanium alloy as the positive electrode, graphite flakes as the negative electrode, and 0.1 wt% ammonium fluoride in ethylene glycol solution as the electrolyte. Under the action of a constant voltage of 40 V, the reaction time is 1 h to complete Primary oxidation of metal. The metal titanium or titanium alloy after the primary oxidation is ultrasonically removed from the surface oxide layer, and the secondary oxidation is performed under the same conditions for a reaction time of 0.1 h to prepare a titanium dioxide nanotube layer with a regular tubular array structure. Calcination at a high temperature of 400 ℃ for 1.5h causes the titanium dioxide to change from amorphous to anatase.

[0027] Step 2: Use titanium or titanium alloy with an array layer of titanium dioxide nan...

Example Embodiment

[0028] Example 2

[0029] The preparation method of the composite anticorrosive coating on the surface of medical titanium or titanium alloy, the steps are as follows:

[0030] Step 1: Use metallic titanium or titanium alloy as the positive electrode, graphite sheet as the negative electrode, and 2 wt% ammonium fluoride in ethylene glycol solution as the electrolyte. Under the action of a constant voltage of 80 V, the reaction time is 30 h to complete Primary oxidation of metal. The primary oxidized titanium or titanium alloy is ultrasonically removed from the surface oxide layer, and the secondary oxidation is performed under the same conditions for a reaction time of 7 hours to prepare a titanium dioxide nanotube layer with a regular tubular array structure. Calcination at a high temperature of 500 ℃ for 3.5h causes the titanium dioxide to change from amorphous to anatase.

[0031] Step 2: Use metal titanium or titanium alloy with an array layer of titanium dioxide nanotubes as t...

Example Embodiment

[0032] Example 3

[0033] The preparation method of the composite anticorrosive coating on the surface of medical titanium or titanium alloy, the steps are as follows:

[0034] Step 1: Use metal titanium or titanium alloy as the positive electrode, graphite sheet as the negative electrode, and 0.4 wt% ammonium fluoride in ethylene glycol solution as the electrolyte. Under the action of a constant voltage of 55 V, the reaction time is 5 hours to complete Primary oxidation of metal. The metal titanium or titanium alloy after primary oxidation is ultrasonically removed from the oxide layer on its surface, and the secondary oxidation is performed under the same conditions for a reaction time of 0.5 h to prepare a titanium dioxide nanotube layer with a regular tubular array structure. Calcination at a high temperature of 420 ℃ for 2h causes the titanium dioxide to change from amorphous to anatase.

[0035] Step 2: Use metal titanium or titanium alloy with an array of titanium dioxide na...

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Abstract

The invention provides a medical metal titanium or titanium alloy surface composite anticorrosive coating and a preparation method thereof. The composite anticorrosive coating consists of a highly ordered titanium dioxide nanotube array layer and a cauliflower-shaped polyaniline film layer, wherein the pore diameter of the titanium dioxide nanotubes is 50-200 nm, the thickness of the titanium dioxide nanotubes is 1-50 [mu]m, and the thickness of the polyaniline layer is 0.5-6 [mu]m. The preparation method is simple, short in process flow, good in repeatability and strong in operability. According to the polyaniline or titanium dioxide composite anticorrosive coating, the titanium dioxide nanotubes are grown on the surface of a substrate metal in situ, the elastic modulus and hardness of the medical metal titanium or titanium alloy surface are reduced, the residual stress caused by the difference of thermal expansion coefficients is reduced, the bonding strength between the coating andthe metal is improved, and meanwhile, due to the synergistic anticorrosive effect of titanium dioxide and polyaniline, the corrosion potential of the substrate metal covered with the composite coatingis shifted forward, the corrosion current density is reduced, and good anticorrosive performance is showed.

Description

technical field [0001] The invention relates to the field of metal corrosion and protection, in particular to a composite anticorrosion coating on the surface of medical titanium or titanium alloy and a preparation method thereof. Background technique [0002] Medical metal materials are a class of inert metal materials that can be implanted into living organisms for diagnosis, treatment or replacement of internal organs and tissues or enhancement of their functions. Titanium and titanium alloy materials are currently the most widely used implant metals. They have excellent mechanical properties such as low density, high specific strength, and elastic modulus similar to bone, and are non-toxic, good biocompatibility, corrosion resistance and The anti-fatigue performance is obviously better than other medical metals (stainless steel, cobalt-based alloys and magnesium alloys, etc.), so it has been more and more widely used clinically, such as repairing various bone loss, artif...

Claims

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Application Information

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IPC IPC(8): C25D11/26C25D13/08C09D5/08C09D7/61C09D179/02
CPCC08K2201/011C09D5/08C09D7/61C09D179/02C25D11/26C25D13/04C08K7/24
Inventor 崔思文米立伟刘宁
Owner ZHONGYUAN ENGINEERING COLLEGE
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