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Biomedical magnesium alloy with dual corrosion resistance and preparation method thereof

A biomedical and magnesium alloy technology, which is applied in pharmaceutical formulations, metal processing equipment, additive manufacturing, etc., can solve the problems of intensified corrosion process, accelerated degradation of magnesium alloys, and limited protection, so as to improve the corrosion resistance of alloys and improve the corrosion resistance of alloys. The effect of corrosion performance

Inactive Publication Date: 2018-12-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the single graphene or tin dioxide coating currently prepared has the problems of low density and limited protective effect; more importantly, the protective effect of the coating only exists in the initial stage of magnesium alloy corrosion, once the surface coating is damaged, the damage The exposed magnesium alloy substrate acts as a small anode, while the residual coating acts as a large cathode, and the corrosion process will be further aggravated, resulting in accelerated degradation and failure of the magnesium alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Dip 20g of AZ61 magnesium alloy powder into 200mL of 3.0mol / L sodium hydroxide (NaOH) solution and etch for 15 minutes to form negatively charged hydroxyl groups (-OH) on the particle surface. The etched powder was ultrasonically cleaned in deionized water for 30 minutes, and dried in a vacuum oven for 5 hours.

[0026] 2) Immerse 20 g of dried powder into 200 mL of 1 vol % polydiallyldimethylammonium chloride (PDDA) solution for 10 minutes, positively charge the surface of the powder particles by adsorption of positively charged PDDA, and use the powder After rinsing with deionized water and drying, immerse in 200mL 1wt% graphene oxide solution for 10 minutes, rinse with deionized water again and dry to obtain AZ61 powder wrapped by PDDA-graphene oxide layer.

[0027] 3) 0.5g tin chloride dihydrate (SnCl 2 2H 2 O) adding 10 mL of absolute ethanol and 30 mL of water into the mixed solution, and adjusting the pH with 3.0 mol / L NaOH solution to obtain a weakly alkali...

Embodiment 2

[0031] 1) Dip 20g of AZ61 magnesium alloy powder into 200mL of 3.0mol / L sodium hydroxide (NaOH) solution and etch for 20 minutes to form negatively charged hydroxyl groups (-OH) on the particle surface. The etched powder was ultrasonically cleaned in deionized water for 30 minutes, and dried in a vacuum oven for 5 hours.

[0032] 2) Immerse 20g of dried powder into 200mL 1vol% polydiallyldimethylammonium chloride (PDDA) solution for 15 minutes, positively charge the surface of powder particles by adsorption of positively charged PDDA, and use the powder After rinsing with deionized water and drying, immerse in 200mL of 1wt% graphene oxide solution for 15 minutes, rinse with deionized water again and dry to obtain AZ61 powder wrapped in PDDA-graphene oxide layer.

[0033] 3) 0.5g tin chloride dihydrate (SnCl 2 2H 2 O) adding 10 mL of absolute ethanol and 30 mL of water into the mixed solution, and adjusting the pH with 3.0 mol / L NaOH solution to obtain a weakly alkaline (pH=1...

Embodiment 3

[0037] 1) Dip 200g of AZ61 magnesium alloy powder into 200mL of 3.0mol / L sodium hydroxide (NaOH) solution and etch for 15 minutes to form negatively charged hydroxyl groups (-OH) on the particle surface. The etched powder was ultrasonically cleaned in deionized water for 30 minutes, and dried in a vacuum oven for 5 hours.

[0038] 2) Immerse the dried 20g powder in 200mL 1vol% polydiallyldimethylammonium chloride (PDDA) solution for 10 minutes, make the surface of the powder particle positively charged by adsorption of positively charged PDDA, and use the powder After rinsing with deionized water and drying, immerse in 200 mL of 1 wt% graphene oxide solution for 10 minutes, rinse with deionized water again and dry to obtain AZ61 powder wrapped in PDDA-graphene oxide layer.

[0039] 3) 0.5g tin chloride dihydrate (SnCl 2 2H 2 O) adding 10 mL of absolute ethanol and 30 mL of water into the mixed solution, and adjusting the pH with 3.0 mol / L NaOH solution to obtain a weakly alk...

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PUM

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Abstract

The invention relates to a biomedical magnesium alloy with dual corrosion resistance and a preparation method thereof. The biomedical magnesium alloy with the dual corrosion resistance is composed ofa biological magnesium alloy matrix, inner layer graphene and outer layer stannic oxide, wherein the inner layer graphene and the outer layer stannic oxide are evenly distributed on a magnesium alloycrystal boundary, dual resistance is provided through the two-layer structure of graphene and stannic oxide, and thus the degradation resistance of the magnesium alloy is improved. The preparation method comprises the steps that firstly, magnesium alloy powder is soaked in an NaOH solution for etching, so that electronegative hydroxyl is formed on the particle surface; then the powder is soaked ina PDDA solution so that the particle surface can be electropositive; then the powder is soaked in a graphene oxide solution to obtain a PDDA-graphene oxide wrapping layer, and then the powder is soaked in an alkalescent stannic chloride aqueous solution, so that magnesium alloy powder wrapped with a graphene-stannic oxide two-layer structure is obtained; and finally, under a protective atmosphere, the biomedical magnesium alloy with excellent corrosion resistance is prepared through selective laser melting. According to the biomedical magnesium alloy with the dual corrosion resistance and thepreparation method thereof, magnesium alloy grains are wrapped with the graphene-stannic oxide two-layer structure so that a two-layer protection shield can be achieved to isolate contact between themagnesium alloy and a corroding medium, and the corrosion resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of biomedical implants, in particular to a biomedical magnesium alloy with double corrosion resistance and a preparation method thereof. Background technique [0002] Density of magnesium alloy (1.74g / cm 3 ) and elastic modulus (~45GPa) are related to the density of human cortical bone (1.75 g / cm 3 ) is close to the elastic modulus (10-40GPa), and can match the bone tissue after implantation in the human body, effectively alleviating or even avoiding the "stress shielding effect". At the same time, the magnesium alloy can gradually degrade in the body, avoiding the pain and injury caused by the second operation to the patient. In addition, the magnesium released during the degradation of magnesium alloys is an essential trace element for the human body, which can participate in bone mineral metabolism, promote the proliferation and differentiation of bone cells, and promote bone growth and healing. Theref...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F3/105C22C1/05C22C23/00A61L27/04A61L27/30A61L27/50B33Y10/00B33Y70/00
CPCA61L27/047A61L27/303A61L27/306A61L27/50C22C1/05C22C23/00B33Y10/00B33Y70/00A61L2400/18A61L2420/02A61L2420/08B22F10/00B22F1/16B22F10/36B22F10/32B22F10/34B22F10/28Y02P10/25
Inventor 高成德帅词俊
Owner CENT SOUTH UNIV
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