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Surface modification method of magnesium alloy

A surface modification, magnesium alloy technology, applied in metal material coating process, superimposed layer plating, coating, etc., can solve the problems of uncontrollable, fast corrosion speed, insufficient surface modification, etc., to promote adhesion and growth, improve biological activity, and expand the effect of application range

Inactive Publication Date: 2018-04-03
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, magnesium alloy materials have the problem that the corrosion rate is too fast and even uncontrollable. A magnesium alloy cardiovascular stent is placed in a simulated body fluid in vitro for one to two weeks, and the corrosion and degradation are basically complete. The service period is required, and if it degrades too fast, it will cause problems such as hemolysis and osteolysis
One of the current effective ways to solve the above problems is surface modification, but surface modification alone is far from enough. As an implanted material in vivo, the cell responsiveness of magnesium alloy materials also needs to be further enhanced to promote tissue repair as soon as possible. , thus further reducing the requirement on material corrosion / degradation time

Method used

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  • Surface modification method of magnesium alloy
  • Surface modification method of magnesium alloy
  • Surface modification method of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing hydroxyapatite on the surface of a magnesium alloy treated by micro-arc oxidation, the specific steps are as follows:

[0030] (1) Substrate surface pretreatment

[0031] Polish the magnesium alloy sheet with 100-mesh, 300-mesh and 2000-mesh sandpaper in turn until the surface is bright, and then ultrasonically clean it with acetone for 5 minutes to obtain a clean metal surface;

[0032] (2) Micro-arc oxidation

[0033] With 15g / L Na 2 SiO 3 and 3g / L KOH solution as the electrolyte, the magnesium alloy sheet processed in step (1) is the anode, and the graphite is the cathode, the magnesium alloy sheet and the graphite rod are immersed in the electrolyte, and the voltage is 350V, the frequency is 100Hz, and the duty cycle A DC pulse power supply with a ratio of 30% and a distance between Yin and Yang of 4 cm is used to perform plasma anodic oxidation treatment on magnesium alloy, and the treatment time is 10 minutes;

[0034] (3) Deposition of ...

Embodiment 2

[0039] A method for preparing hydroxyapatite on the surface of a magnesium alloy treated by micro-arc oxidation, the specific steps are as follows:

[0040] (1) Substrate surface pretreatment

[0041] With embodiment 1;

[0042] (2) Micro-arc oxidation

[0043] With 5g / L Na 2 SiO 3 And 1g / L KOH solution is the electrolyte, the magnesium alloy sheet after step (1) is the anode, and the graphite is the cathode. The magnesium alloy sheet and the graphite rod are immersed in the electrolyte, and the voltage is 200V, the frequency is 300Hz, and the duty cycle A DC pulse power supply with a ratio of 10% and a distance between Yin and Yang of 3 cm is used to perform plasma anodic oxidation treatment on magnesium alloy, and the treatment time is 20 minutes;

[0044] (3) Deposition of polydopamine

[0045] The magnesium alloy after step (2) is soaked in the dopamine hydrochloride solution of 1mg / mL for 0.5 hour, obtains the magnesium alloy of surface deposition polydopamine film l...

Embodiment 3

[0049] (1) Substrate surface pretreatment

[0050] With embodiment 1;

[0051] (2) Micro-arc oxidation

[0052] With 50g / L Na 2 SiO 3 And 5g / L KOH solution is electrolyte, the magnesium alloy sheet after step (1) is anode, and graphite is cathode, magnesium alloy sheet and graphite rod are immersed in electrolyte, adopting voltage is 500V, frequency is 500Hz, duty cycle A DC pulse power supply with a ratio of 50% and a distance between Yin and Yang of 6 cm is used to perform plasma anodic oxidation treatment on magnesium alloy, and the treatment time is 30 minutes;

[0053] (3) Deposition of polydopamine

[0054] Soak the magnesium alloy after step (2) in the dopamine hydrochloride solution of 6mg / mL for 2 hours to obtain the magnesium alloy of the polydopamine film layer deposited on the surface; preparation;

[0055] (4) Deposition of hydroxyapatite

[0056]Soak the magnesium alloy treated in step (3) in 1 mol / L hydroxyapatite solution for 2 hours to obtain the magnes...

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Abstract

The invention discloses a method for modifying the surface of a magnesium alloy. The surface of the magnesium alloy is pretreated and subjected to micro-arc oxidation to form a micro-arc oxidation coating, and then polydopamine is deposited on the micro-arc oxidation coating, and the deposited polydopamine is Magnesium alloys were immersed in hydroxyapatite solution to obtain surface-modified magnesium alloys. Micro-arc oxidation can provide corrosion protection for magnesium alloys. Hydroxyapatite is a bioactive and degradable ceramic. Depositing it on the surface of micro-arc oxidation magnesium alloys can effectively improve biological activity and promote the adhesion of osteoblasts on the surface of the material. Accompanying growth, so as to meet the needs of magnesium alloys as implant materials in vivo. Compared with the preparation of the hydroxyapatite coating by the existing electrodeposition method, the present invention does not need instruments and equipment, has low cost and expands the application range.

Description

technical field [0001] The invention belongs to the field of medical metal materials, and in particular relates to a method for modifying the surface of a magnesium alloy. Background technique [0002] The density of magnesium alloy is about 1.7g / cm 3 , because it is closer to the density of human bone (about 1.75g / cm 3 ), magnesium alloy materials have unique advantages as a new generation of degradable medical metal materials. In addition, magnesium alloy materials are easy to process and shape, and their processing performance is far superior to other types of degradable implant materials such as polylactic acid and calcium phosphate. Magnesium alloy materials have excellent comprehensive mechanical properties and unique biodegradation functions. One of the essential macro metal elements, the elastic modulus of magnesium alloy is about 45GPa, which is close to the elastic modulus of human bones (10-40GPa), which can effectively alleviate or even avoid the "stress shieldi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C22/60C25D11/30
Inventor 刘鹏赵永春
Owner CHONGQING UNIV
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