Magnesium alloy surface modification method

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

Inactive Publication Date: 2015-07-01
CHONGQING UNIV
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  • 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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Experimental program
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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, and 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] The magnesium alloy after step (2) is soaked in the dopamine hydrochloride solution of 6mg / mL for 2 hours, obtains the magnesium alloy of surface deposition polydopamine film layer; Described dopamine hydrochloride solution uses 10mM, the Tris buffer solution that pH value is 8.5 preparation;

[0055] (4) Deposition of hydroxyapatite

[0056]Soak the magnes...

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Abstract

The invention discloses a magnesium alloy surface modification method which comprises the following steps: pretreating the magnesium alloy surface, performing micro-arc oxidation, and forming a micro-arc oxidation coating; depositing poly-dopamine on the micro-arc oxidation coating, immersing the magnesium alloy on which poly-dopamine is deposited in a hydroxyapatite solution, thereby obtaining a surface modified magnesium alloy. The micro-arc oxidation can provide a corrosion prevention effect for the magnesium alloy, the hydroxyapatite belongs to bioactive degradable ceramics and is deposited on the surface of the micro-arc oxidation magnesium alloy, the biological activity can be effectively improved, and adhesion and growth of osteoblasts on the material surface are promoted, so that the requirement on the magnesium alloy serving as an in-vivo implant material is met. Compared with the conventional electrodeposition method for preparing a hydroxyapatite coating, the method disclosed by the invention has the advantages that instruments and equipment are not needed, the cost is low, and the application range is widened.

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 Applications(China)
IPC IPC(8): C23C28/00C23C22/60C25D11/30
Inventor 刘鹏赵永春
Owner CHONGQING UNIV
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