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Method for preparing bio-coating on surface of magnesium alloy by combining laser shock with micro-arc oxidation

A micro-arc oxidation and laser shock technology, applied in anodizing and other directions, can solve the problems of difficult mechanical integrity, magnesium alloy matrix corrosion resistance, limited mechanical properties, etc., to increase physical and chemical properties, good biocompatibility, etc. and biological activity, beneficial to industrialization

Inactive Publication Date: 2016-11-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the micro-arc oxidation coating is thin, and due to the porous microstructure of the micro-arc oxidation coating, the corrosion resistance and mechanical properties of the magnesium alloy substrate are limited, and it is difficult to maintain the mechanical integrity for a long time in a biological environment.

Method used

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  • Method for preparing bio-coating on surface of magnesium alloy by combining laser shock with micro-arc oxidation
  • Method for preparing bio-coating on surface of magnesium alloy by combining laser shock with micro-arc oxidation
  • Method for preparing bio-coating on surface of magnesium alloy by combining laser shock with micro-arc oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The micro-arc oxidation reaction was carried out on the AZ80 magnesium alloy without laser shock treatment by using the micro-arc oxidation method.

[0028] Electrolyte concentration composition: Na 2 SiO 3 12g, NaF 5g, NaOH 5g, ethylene glycol 10ml, hydroxyapatite 3g, K 2 TiF 6 2g / L, deionized water 1L.

[0029] Specific steps are as follows:

[0030] (1) Pretreatment: Cut the AZ80 magnesium alloy substrate into rectangular sheets of 60mm×20mm×2mm, and polish them with 280#, 500#, 800#, 1200# metallographic sandpaper to remove surface oxides and surface scratches, and then test The samples were ultrasonically cleaned in acetone for 10 min, then washed with deionized water, and dried naturally at room temperature. A pretreated magnesium alloy (AZ80-BM) was obtained.

[0031] (2) Micro-arc oxidation: immerse the pretreated AZ80 magnesium alloy obtained in step (1) as the anode in the electrolyte, use the micro-arc oxidation electrolytic cell as the cathode, and use...

Embodiment 2

[0033] The combination of laser shock strengthening and micro-arc oxidation was used to generate bioactive coating on the surface of AZ80 magnesium alloy. The specific steps are as follows:

[0034] (1) Pretreatment: Same as step (1) in Example 1.

[0035] (2) Laser strengthening treatment: aim the laser at the surface of the sample, the area to be treated is 40mm×15mm on the surface of the sample, and the wavelength of the laser is λ 1 =1064nm, pulse width τ 1 = 20ns, energy Q = 2J, spot diameter D = 3mm, the laser spots are arranged in a continuous overlapping manner without intervals, and the coverage rate of adjacent spots is 50%. The processed samples were ultrasonically cleaned in anhydrous ethanol, taken out with deionized water, dried naturally, and finally sealed and packaged.

[0036] (3) Micro-arc oxidation treatment: the sample obtained in step (2) in Example 2 is immersed in the electrolyte as an anode, and the micro-arc oxidation electrolytic cell is used as a ...

Embodiment 3

[0046] The difference from Example 1 is: the AZ80 magnesium alloy is processed into such as image 3 The size shown, other operations are the same as in Embodiment 1.

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Abstract

Disclosed is a method for preparing a bio-coating on the surface of a magnesium alloy by combining laser shock with micro-arc oxidation. The method comprises the following steps of (1) pretreatment of a magnesium alloy substrate; (2) laser shock strengthening, specifically, laser is directed at the surface of a sample, a to-be-strengthened area is a rectangular area on the surface of the sample, the wavelength lambda 1 of a laser is 1064 nm, the pulse width tau1 is 20 ns, the energy Q is 2J, the spot diameter D1 is 3 mm, laser spots are distributed in a non-spaced continuous overlapping mode, and the coverage rate of adjacent spots is 50%; and the periphery of the strengthened area of the processed sample is rubbed off by use of a pregrinder, the processed sample is placed into absolute ethyl alcohol or acetone for ultrasonic cleaning, and then the sample is taken out, washed with deionized water, naturally dried, and finally packaged in a sealed mode; and (3) micro-arc oxidation, specifically, the sample with the surface strengthened by laser shock in the step (2) is submerged into an electrolyte as a positive pole, a micro-arc oxidation stainless steel electrolytic bath serves as a negative pole, a constant-pressure mode is adopted, the electrolyte is subjected to reaction for 10-20 min at the temperature of 20-30 DEG C, and after the experiment is completed, the sample is taken out, washed with plasma water and dried.

Description

technical field [0001] The invention relates to a method for preparing a biological coating on the surface of a magnesium alloy by combining laser shock and micro-arc oxidation, and belongs to the technical field of magnesium alloy surface modification. Background technique [0002] Magnesium alloys have excellent mechanical properties, and their physical properties are close to those of human bones. Magnesium and its alloys have the following advantages: (1) Density of magnesium alloys (1.74~2.0g / cm 3 ) and body density (1.8~2.1g / cm 3 )(2) Young's modulus of magnesium alloy is closer to human bone than titanium alloy and stainless steel. (3) Magnesium is degradable under physiological environment. Magnesium is a constant element in the human body, and its content is second only to calcium, sodium and potassium. It has anticoagulant and tissue compatibility. Magnesium participates in human metabolism. It can be seen that magnesium and its alloys have obvious advantages as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F3/00C25D11/30
CPCC22F3/00C25D11/30
Inventor 熊缨胡强宋仁国
Owner ZHEJIANG UNIV OF TECH
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