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Method for preparing strontium-doped calcium phosphate coating on surface of magnesium alloy through one-step hydrothermal method

A calcium-phosphorus coating and magnesium alloy technology, which is applied in metal material coating technology, coating, medical science, etc., can solve the problems of limited substrate protection, low coating density, and low production efficiency, and achieve large Commercial promotion value, short time required, effect of improving corrosion resistance

Inactive Publication Date: 2017-05-17
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

The above-mentioned methods for preparing strontium-doped hydroxyapatite can improve the properties of magnesium alloys to varying degrees, but there are still some shortcomings: the coating prepared by micro-arc oxidation is not high in density, and has limited protective effect on the substrate; The hydrothermal method takes a long time to prepare the coating, and the production efficiency is low
In the above-mentioned patents, most of the strontium-doped hydroxyapatite powders are prepared, and the strontium-doped calcium-phosphorus coating is not directly prepared. Compared with other methods for preparing strontium-doped calcium-phosphorus coatings, one-step water There are few reports on the preparation of strontium-doped calcium-phosphorus coatings by thermal method

Method used

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  • Method for preparing strontium-doped calcium phosphate coating on surface of magnesium alloy through one-step hydrothermal method
  • Method for preparing strontium-doped calcium phosphate coating on surface of magnesium alloy through one-step hydrothermal method
  • Method for preparing strontium-doped calcium phosphate coating on surface of magnesium alloy through one-step hydrothermal method

Examples

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Embodiment 1

[0028] Process the AZ31 magnesium alloy into a block of 10mm×10mm×2mm, and use 600 # , 1200 # , 2000 # Polished with SiC sandpaper, then ultrasonically cleaned in acetone, deionized water, and absolute ethanol for 10 minutes, and dried with hot air. Prepare 150 mL of 3 mol / L NaOH deionized aqueous solution. Soak the polished magnesium alloy in NaOH solution at 60°C for 3 hours, then rinse the magnesium alloy sample with deionized water and dry it. With Ca(NO 3 ) 2 Prepare Ca for Ca source 2+ Aqueous solution, as Na 2 HPO 4 Preparation of PO for P source 4 3- Aqueous solution, with Sr(NO 3 ) 2 Preparation of Sr for Sr source 2+ aqueous solution. Then Sr 2+ and PO 4 3- The aqueous solution was added dropwise with Ca 2+ In the aqueous solution, finally the pH value of the mixed solution was adjusted to 6 with 20 M dilute hydrochloric acid, and stirred by magnetic force for 2 h. Among them, Ca in the mixed solution 2+ The concentration is 6mmol / L, Sr 2+ The con...

Embodiment 2

[0030] Process the AZ91 magnesium alloy into a block of 10mm×10mm×2mm, and use 600 # , 2000 # Polished with SiC sandpaper, then ultrasonically cleaned in acetone, deionized water, and ethanol for 6 minutes, and dried with hot air. Prepare 150 mL of 2 mol / L NaOH deionized aqueous solution. Soak the polished magnesium alloy in NaOH solution at 70°C for 2 hours, then rinse the magnesium alloy sample with deionized water and dry it. with CaCl 2 Prepare Ca for Ca source 2+ Aqueous solution, as NaH 2 PO 4 Preparation of PO for P source 4 3- Aqueous solution, with Sr(NO 3 ) 2 Preparation of Sr for Sr source 2+ aqueous solution. Then Sr 2+ and PO 4 3- Aqueous solution was added dropwise to Ca 2+ In the aqueous solution, the pH value of the mixed solution was finally adjusted to 5.5 with 15M dilute nitric acid, and magnetically stirred for 1.5 h. Among them, Ca in the mixed solution 2+ The concentration is 5.5mmol / L, Sr 2+ The concentration is 0.4mmol / L, PO 4 3- The...

Embodiment 3

[0032] AZ61 is used as the magnesium alloy matrix, followed by 600 # , 1200 # , 1500 # Polished with SiC sandpaper, then ultrasonically cleaned in acetone, deionized water, and ethanol for 8 minutes, and dried with hot air. Prepare 150 mL of 2 mol / L NaOH deionized aqueous solution. Soak the polished magnesium alloy in NaOH solution at 80°C for 1 hour, then rinse the magnesium alloy sample with deionized water and dry it. With Ca(CH 3 COO) 2 Prepare Ca for Ca source 2+ Aqueous solution, as NaH 2 PO 4 Preparation of PO for P source 4 3- Aqueous solution, with Sr(NO 3 ) 2 Preparation of Sr for Sr source 2+ aqueous solution. Then PO 4 3- The aqueous solution was added dropwise with Ca 2+ In the aqueous solution, the pH value of the mixed solution was finally adjusted to 6 with 5M acetic acid, and magnetically stirred for 1.5 h. Among them, Ca in the mixed solution 2+ The concentration is 5mmol / L, Sr 2+ The concentration is 0.2mmol / L, PO 4 3- The concentration ...

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Abstract

The invention relates to a method for preparing a strontium-doped calcium phosphate coating on the surface of magnesium alloy through a one-step hydrothermal method. The method includes the steps that a coating solution is placed in a reaction still, and a magnesium alloy sample treated through alkali is soaked into the coating solution; the reaction still is placed in a drying oven, and heat preservation lasts for 1-3 h at the temperature of 90-110 DEG C; and finally, the reaction still is cooled to an indoor temperature along with the drying oven, and the magnesium alloy sample is taken out, rinsed with deionized water and then dried. The prepared coating on the surface of the magnesium alloy is structurally divided into an upper layer and a lower layer. The upper layer of the coating is of a flower-shaped cluster structure, the lower layer of the coating is of a compact sheet structure, and the coating thickness is 1-2 microns. In an in-vitro immersion experiment, deposited hydroxyapatite appears on the first day to the third day, and good biological activity is achieved; and moreover the alternating-current impedance is 7500-14000 ohm.cm<2>. The biological activity of the magnesium alloy is improved, and meanwhile corrosion resistance of the magnesium alloy in simulated body fluid is improved. The preparation technology is simple, the method is environmentally friendly, and great commercial popularizing value can be achieved.

Description

technical field [0001] The invention relates to a one-step hydrothermal preparation method for a strontium-doped calcium-phosphorus coating on the surface of a magnesium alloy, and belongs to the technical field of surface modification of degradable magnesium alloy implants. Background technique [0002] Magnesium and its alloys are a new class of medical implant materials. The elastic modulus (41-45GPa) of magnesium alloys is more compatible with bone tissue (10-30GPa), which is beneficial to reduce the "stress shielding" of the interface between the implant and human bone tissue. "Effect, promote bone tissue growth. It has good biological activity and biocompatibility. When it is implanted into the human body, it will gradually degrade and will not cause secondary damage to the human body. Magnesium is one of the essential elements in the human body and has no harm to the human body. However, in practical applications, magnesium alloys will react with body fluids in the h...

Claims

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Application Information

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IPC IPC(8): C23C22/57A61L27/04A61L27/32
Inventor 蔡舒李玥江洋洋凌瑞花少帅
Owner TIANJIN UNIV
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