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Method for improving biomedical magnesium alloy corrosion resistance through micro-arc oxidation

A micro-arc oxidation, biomedical technology, applied in anodic oxidation, medical science, prosthesis, etc., can solve the problem of weakening the corrosion resistance of the coating, and achieve the effects of easy access, excellent corrosion resistance, and improved performance

Inactive Publication Date: 2018-11-06
徐琛沣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of these pores and cracks has both advantages and disadvantages: the formation of micropores helps to promote the tight bonding of the coating to the substrate, however, it reduces the corrosion resistance of the coating

Method used

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  • Method for improving biomedical magnesium alloy corrosion resistance through micro-arc oxidation
  • Method for improving biomedical magnesium alloy corrosion resistance through micro-arc oxidation
  • Method for improving biomedical magnesium alloy corrosion resistance through micro-arc oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Cut the ZK60 magnesium alloy into 20*20*5mm sample blocks with an electric spark cutting machine, and drill through holes on the surface with an electric drill. Sand the magnesium alloy with 2000-grit sandpaper to obtain a bright surface. The polished magnesium alloy is ultrasonically cleaned with ethanol and dried. Harbin Institute of Technology WHD20 equipment is used, the positive voltage is 250V, the negative voltage is 20V, the working frequency is 600Hz, the positive duty cycle is 30%, the negative duty cycle is 70%, and the number of positive and negative pulses is 1. The electrolyte is 0.05mol / L Na3PO4, 0.02mol / L Na2B4O7, 0.05mol / L KOH, the reaction time is 15min, the prepared solution is poured into the electrolytic tank, and the stirring device is started to stir the solution to make the solution evenly mixed, using 304 stainless steel The wire passes through the magnesium alloy, the magnesium alloy is immersed in the electrolyte, and the stainless steel wire...

Embodiment 2

[0032] Cut the ZK60 magnesium alloy into 20*20*5mm sample blocks with an electric spark cutting machine, and drill through holes on the surface with an electric drill. Sand the magnesium alloy with 2000-grit sandpaper to obtain a bright surface. The polished magnesium alloy is ultrasonically cleaned with ethanol and dried. Harbin Institute of Technology WHD20 equipment is used, the positive voltage is 300V, the negative voltage is 20V, the working frequency is 600Hz, the positive duty cycle is 30%, the negative duty cycle is 70%, and the number of positive and negative pulses is 1. The electrolyte is 0.05mol / L Na3PO4, 0.02mol / L Na2B4O7, 0.05mol / L KOH, the reaction time is 15min, the prepared solution is poured into the electrolytic tank, and the stirring device is started to stir the solution to make the solution evenly mixed, using 304 stainless steel The wire passes through the magnesium alloy, the magnesium alloy is immersed in the electrolyte, and the stainless steel wire...

Embodiment 3

[0034] Cut the ZK60 magnesium alloy into 20*20*5mm sample blocks with an electric spark cutting machine, and drill through holes on the surface with an electric drill. Sand the magnesium alloy with 2000-grit sandpaper to obtain a bright surface. The polished magnesium alloy is ultrasonically cleaned with ethanol and dried. Harbin Institute of Technology WHD20 equipment is used, the forward voltage is 350V, the negative voltage is 20V, the working frequency is 600Hz, the positive duty cycle is 30%, the negative duty cycle is 70%, and the number of positive and negative pulses is 1. The electrolyte is 0.05mol / L Na3PO4, 0.02mol / L Na2B4O7, 0.05mol / L KOH, the reaction time is 15min, the prepared solution is poured into the electrolytic tank, and the stirring device is started to stir the solution to make the solution evenly mixed, using 304 stainless steel The wire passes through the magnesium alloy, the magnesium alloy is immersed in the electrolyte, and the stainless steel wire ...

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Abstract

The invention relates to a method for improving biomedical magnesium alloy corrosion resistance through micro-arc oxidation. The method comprises the specific steps that S1, abrasive paper is used forpolishing the surface of a ZK60 magnesium alloy product; S2, the polished magnesium alloy product is placed into an ethanol solution to be subjected to ultrasonic cleaning and drying; S3, a preparedsolution is poured into an electrolytic cell; S4, the magnesium alloy product is fixed to a support through a stainless steel wire to be soaked into an electrolyte; S5, a micro-arc oxidation power source is started, working parameters with the positive voltage being 250 V, the negative voltage being 20 V, the working frequency being 600 Hz, the positive vacuum ratio being 30%, the negative duty ratio being 70% and the positive and negative pulse number being 1 are used for conducting micro-arc oxidation processing on the magnesium alloy product for 15 min; and S6, absorbent paper is used for drying, and natural drying is then carried out after the magnesium alloy product is subjected to deionized water ultrasonic cleaning. By means of the method, toxic substances are not contained, and themethod is environment-friendly and convenient, and the prepared micro-arc oxidation magnesium alloy product has the good corrosion resistance.

Description

technical field [0001] The invention relates to the surface modification of biomedical magnesium alloys, in particular to a method for improving the corrosion resistance of biomedical magnesium alloys by adopting micro-arc oxidation. Background technique [0002] Among the biomaterials for surgical bone grafting and internal fixation, titanium alloys and stainless steel are mostly used clinically, but these materials do not degrade in the human body, and need to be removed through a second operation to increase the pain of the patient. At the same time, traditional bone graft materials have a "stress shielding" effect, which greatly affects tissue growth and healing. In recent years, magnesium alloys are degradable in the human body and have similar mechanical properties to human bone. At the same time, magnesium ions have been proved to have bone-promoting properties, so they have been widely studied by scientists. [0003] However, the corrosion rate of magnesium alloy is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30A61L27/04A61L27/56A61L27/58
Inventor 徐琛沣
Owner 徐琛沣
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