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A kind of preparation method of magnesium alloy surface micro-arc electrophoresis containing ha biocomposite film layer

A bio-composite film and bio-film layer technology is applied in the field of preparing bio-film layers on the surface of magnesium alloys to achieve the effects of reducing defects, uniform and dense appearance, and increasing bonding force

Active Publication Date: 2020-07-14
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to combine micro-arc oxidation and electrophoretic deposition to prepare a biocomposite film on the surface of magnesium alloys, effectively solving the shortcomings of a single method for preparing magnesium alloy biofilms, thereby improving the corrosion resistance and surface biological activity of magnesium alloys

Method used

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  • A kind of preparation method of magnesium alloy surface micro-arc electrophoresis containing ha biocomposite film layer
  • A kind of preparation method of magnesium alloy surface micro-arc electrophoresis containing ha biocomposite film layer
  • A kind of preparation method of magnesium alloy surface micro-arc electrophoresis containing ha biocomposite film layer

Examples

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Embodiment 1

[0027] A kind of preparation method of magnesium alloy surface micro-arc electrophoresis containing HA biocomposite membrane layer is carried out according to the following steps:

[0028] (1) Surface pretreatment of the magnesium alloy sample: the magnesium alloy is processed into a 20mm×20mm×5mm pattern by wire cutting, the surface of the sample is ground with 600#, 1000# and 1500# sandpaper in sequence, and then acetone, alcohol and desiccant are used in sequence. Ultrasonic cleaning of the samples with ionized water, and then drying for later use;

[0029] (2) Micro-arc oxidation treatment: the magnesium alloy sample in step (1) is placed in the bioelectrolyte, the magnesium alloy sample is used as the anode, the stainless steel tank is used as the cathode, the temperature of the electrolyte is 35-40°C, and the current density is 10A / dm 2 1. Under the condition of working frequency of 500Hz and duty cycle of 40%, micro-arc oxidation was performed for 13 minutes to obtain ...

Embodiment 2

[0039] The difference between this embodiment and embodiment 1 is:

[0040] The micro-arc oxidation current density in step (2) is 20A / dm 2 , the frequency is 700Hz, the duty cycle is 20%, and the micro-arc oxidation time is 20min. Other parameters are the same as in Example 1.

[0041] The appearance of the composite film obtained in this example is uniform and dense, with a thickness of about 51 μm, of which the micro-arc oxidation layer is about 41 μm, and the deposited layer is about 10 μm; the porosity of the film layer is 0.21, the roughness is 1.19 μm, and the contact angle is 0° ,like image 3 As shown, compared with the substrate, the corrosion potential increased from -1.57V to -0.21V in 3.5wt% NaCl solution, and the corrosion current density was 3.28×10 -7 A / cm 2 The Ca / P of the surface film layer is about 1.60, such as Figure 4 As shown, the film layer has α-TCP(Ca 9 HPO 4 (PO 4 ) 5 OH) products, later decomposed into HA, such as Figure 5 As shown, the ...

Embodiment 3

[0043] The difference between this embodiment and embodiment 1 is:

[0044] The HA concentration in step (4) is 20g / L, the electrophoresis voltage is 60V, and the electrophoresis time is 5min. Other parameters are the same as in Example 1.

[0045] The appearance of the composite film obtained in this example is uniform and dense, with a thickness of about 52 μm, in which the micro-arc oxidation layer is about 40 μm, the deposited layer is about 12 μm, and the porosity of the film layer is 0.2, such as figure 2 As shown; the roughness is 1.18μm, the contact angle is 1°, compared with the substrate, the corrosion potential increases from -1.57V to -0.20V in 3.5wt% NaCl solution, and the corrosion current density is 3.27×10 -7 A / cm 2 The Ca / P of the surface film layer is about 1.62, and the film layer has α-TCP(Ca 9 HPO 4 (PO 4 ) 5 OH) product, which is decomposed and converted into HA in the later stage, so the corrosion resistance, biological activity and osteoinductivi...

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Abstract

The invention discloses a method for preparing a biocomposite film layer containing HA by micro-arc electrophoresis on the surface of a magnesium alloy. The step is to immerse the pretreated magnesium alloy as the anode of micro-arc oxidation into the bio-electrolyte, and the stainless steel electrolytic cell as the cathode, and use the DC pulse power supply and the optimized bio-electrolyte for micro-arc oxidation to prepare biocompatible The permanent micro-arc oxidation ceramic film layer is ultrasonically cleaned with anhydrous ethanol and air-dried; then the air-dried sample is placed in the electrophoretic solution containing hydroxyapatite nanoparticles as the cathode, and the anode electrode is a stainless steel sheet, which is stabilized by DC Steady current power supply for electrophoretic deposition. The obtained biological composite film combines the advantages of micro-arc oxidation and electrophoretic deposition, and has high corrosion resistance and good biological activity. The preparation process of the invention is simple and convenient for implementation.

Description

technical field [0001] The invention relates to a method for preparing a biofilm layer on the surface of a magnesium alloy, in particular to a method for preparing a composite biofilm layer containing HA on the surface of a magnesium alloy by using a micro-arc oxidation composite electrophoretic deposition method, which effectively improves the corrosion resistance of the magnesium alloy properties, surface bioactivity and osteoinductivity. Background technique [0002] Magnesium and its alloys have good biocompatibility and mechanical properties matching with human bones, and have great application potential in the biological field. However, the standard equilibrium potential of magnesium is -2.37V, which has poor chemical stability, surface corrosion resistance and wear resistance, and cannot protect the substrate well, which seriously inhibits its application and development in the biomedical neighborhood. . Preparation of hydroxyapatite (Hydroxyapatite, HA) coating is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C25D13/02
CPCC25D11/026C25D11/30C25D13/02
Inventor 王泽鑫叶飞陈靓瑜芦笙杨骏
Owner JIANGSU UNIV OF SCI & TECH
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