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A biomedical magnesium alloy with double corrosion resistance and preparation method thereof

A biomedical and magnesium alloy technology, used in pharmaceutical formulations, metal processing equipment, additive manufacturing, etc., can solve the problems of accelerated degradation of magnesium alloys, intensified corrosion process, and limited protection, so as to improve corrosion resistance and improve alloy resistance. Effects of Corrosive Properties

Inactive Publication Date: 2020-03-31
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 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.

[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 alka...

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, which is composed of a biomagnesium alloy substrate, an inner layer of graphene and an outer layer of tin dioxide uniformly distributed on the grain boundaries of the magnesium alloy, and uses graphene and The double-layer structure of tin dioxide provides double resistance, thereby improving the degradation resistance of magnesium alloys. First, the magnesium alloy powder is immersed in NaOH solution for etching to form negatively charged hydroxyl groups on the surface of the particles; then immersed in PDDA solution to positively charge the surface of the particles; Then immerse in the graphene oxide solution to obtain the PDDA-graphene oxide coating layer, and then immerse in the weakly alkaline tin chloride aqueous solution to obtain the magnesium alloy powder wrapped by the graphene-tin dioxide double-layer structure; finally, under the protective atmosphere, pass Preparation of biomedical magnesium alloy with excellent corrosion resistance by selective laser melting. The present invention utilizes the graphene-tin dioxide double-layer structure to wrap the magnesium alloy crystal grains, and serves as a double-layer protective shield to isolate the contact between the magnesium alloy and the corrosive medium, thereby improving the corrosion resistance.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F3/105C22C1/05C22C23/00A61L27/04A61L27/30A61L27/50B33Y10/00B33Y70/10
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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