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A method for improving the corrosion resistance of magnesium-based biomedical materials

A technology of biomedical materials and corrosion resistance, which is applied in the field of corrosion protection of magnesium -based biomedical metal materials. It can solve problems such as fast degradation rate and corrosion. Effect

Inactive Publication Date: 2016-03-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a degradable bone implant material, the degradation rate of magnesium is too fast. It has been reported in the literature that the ZX50 magnesium alloy was significantly corroded 1 week after being implanted in the femur of SD rats, and it almost disappeared after 4 weeks.

Method used

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  • A method for improving the corrosion resistance of magnesium-based biomedical materials
  • A method for improving the corrosion resistance of magnesium-based biomedical materials
  • A method for improving the corrosion resistance of magnesium-based biomedical materials

Examples

Experimental program
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Effect test

Embodiment 1

[0028]1) A magnesium material with a diameter of 10 mm and a thickness of 2.5 mm is used as a sample, which is successively ground with 600-2500 water sandpaper step by step and polished until the surface roughness Ra is not greater than 1 μm, followed by ultrasonic cleaning with absolute ethanol and deionized water for 5 minutes To remove impurities and oil on the surface of the material, and then dry it in the air environment for later use.

[0029] 2) Configure the electroplating solution according to the following components and contents: ZnSO 4 ·7H 2 O30g / L, K 4 P 2 o 7 ·3H 2 O150.0g / L, NaF7.5g / L, C 6 h 17 o 7 N 3 20.0g / L, C 6 h 18 o 24 P 6 1ml / L, C 8 h 8 o 3 0.1g / L,H 2 NSNH 2 2.0g / L. Electroplating was performed on the sample, and the electroplating was magnetically stirred for 30 minutes. Platinum sheet was used as the anode and magnesium was used as the cathode, and the electroplating was performed at 40°C for 5 minutes.

[0030] 3) Place the electro...

Embodiment 2

[0037] 1) The AZ91D magnesium alloy material with a diameter of 10 mm and a thickness of 2.5 mm was used as the sample, and then polished with 600-2500 water sandpaper step by step, and then polished to a surface roughness Ra of not more than 1 μm, followed by ultrasonic cleaning with absolute ethanol and deionized water 10 minutes to remove impurities and oil on the surface of the material, and then dry it in the air environment for later use.

[0038] 2) Prepare an electroplating solution according to the adjusted components, stir it magnetically for 30 minutes, use a platinum sheet as the anode, and AZ91D as the cathode, and electroplate at 40° C. for 8 minutes.

[0039] The electroplating solution composition is: ZnSO 4 ·7H 2 O30g / L, K 4 P 2 o 7 ·3H 2 O200g / L, NaF7.5g / L, C 6 h 17 o 7 N 3 30.0g / L, C 6 h 18 o 24 P 6 1ml / L, C 8 h 8 o 3 0.15g / L,H 2 NSNH 2 3.0g / L.

[0040] 3) After the electroplated sample is air-dried at room temperature, put it into the ark...

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Abstract

The invention discloses a method for improving the corrosion resistance of a magnesium-based biomedical material. The method comprises the following steps: polishing magnesium or magnesium alloy till the surface roughness Ra is not more than 1mu m, cleaning and drying; plating a zinc layer on the surface of the magnesium or magnesium alloy by adopting a pyrophosphate zinc plating process, wherein the thickness of the plated zinc layer is 10 to 100mu m; performing primary diffusion annealing on the plated material in an inert protective atmosphere, repeating step I for the treated material, and plating a zinc layer on the surface of the material again by adopting the pyrophosphate zinc plating process, wherein the thickness of the plated zinc layer is 5 to 10mu m; and performing secondary diffusion annealing on the plated material in the inert protective atmosphere, and finally obtaining a gradient diffused zinc layer on the surface of the test sample through the diffusion annealing treatment. By adopting the method, a fussy pretreatment process before the plating process is avoided, the diffused layer obtained by plating diffusion is uniform, the element is well combined with the matrix, and the preparation process is simple and has huge research significance and application value.

Description

technical field [0001] The invention relates to the field of corrosion protection of magnesium-based biomedical metal materials, in particular to a method for obtaining a gradient diffusion infiltration layer on the surface of a material by means of diffusion annealing after electroplating. Background technique [0002] The preparation of diffusion coating is to heat the material to an appropriate temperature, so that one or more metal elements diffuse into the surface layer to form a surface metallurgical layer. It needs physical and chemical reactions on the interface and metallurgical diffusion from the surface to the inside. Finish. In this method, the coating is metallurgically bonded to the substrate, resulting in excellent adhesion. This method is widely used in engineering applications, especially in the surface anticorrosion method of steel workpieces. [0003] Electroplating on the surface of magnesium alloy is more difficult, because the electrode potential of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/50
Inventor 魏强李小月张善勇马剑雄
Owner TIANJIN UNIV