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Biological magnesium alloy with surface coated with sodium magnesium fluoride film and preparation method thereof

A sodium magnesium fluoride film and surface coating technology, which is applied to chemical instruments and methods, metal layered products, metal material coating processes, etc., can solve the problem of long process time and insufficient corrosion resistance of thicker magnesium fluoride films and other problems, to achieve the effect of short preparation time, prolonging the corrosion resistance time and convenient operation

Active Publication Date: 2013-12-18
江苏凯晞投资有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]Technical problems to be solved: In view of the insufficient corrosion resistance of magnesium alloys in the biomedical field as an implanted metal material and the preparation of thicker magnesium fluoride films For the problem of too long time, the present invention provides a bio-magnesium alloy whose surface is coated with a magnesium-sodium fluoride film and a preparation method thereof

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  • Biological magnesium alloy with surface coated with sodium magnesium fluoride film and preparation method thereof
  • Biological magnesium alloy with surface coated with sodium magnesium fluoride film and preparation method thereof
  • Biological magnesium alloy with surface coated with sodium magnesium fluoride film and preparation method thereof

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Embodiment 1

[0023] A method for preparing a bio-magnesium alloy whose surface is coated with a magnesium-sodium-fluoride film, firstly immersing a degreasing and water-washed Mg-Nd-Zn-Zr magnesium alloy sample in a solution of 80°C, sodium fluoride and hydrofluoric acid After reacting for 30 minutes in the treatment solutions with molar concentrations of 1.6mol / L and 4.8mol / L, the samples were taken out, washed with water and alcohol, and dried in the air.

[0024] as attached figure 1 As shown, the morphology observation of the sodium magnesium fluoride film on the surface of the biological magnesium alloy sample with a scanning electron microscope shows that the sodium magnesium fluoride film is composed of approximately cubic sodium magnesium fluoride particles, and the sodium magnesium fluoride particles have a two-dimensional shape. There are two growth mechanisms of nuclear step growth and helical growth. The average edge length of sodium magnesium fluoride particles is about 2 μm,...

Embodiment 2

[0029] A method for preparing a bio-magnesium alloy whose surface is coated with a magnesium-sodium-fluoride film, firstly immersing a degreasing and water-washed Mg-Nd-Zn-Zr magnesium alloy sample in a solution of 80°C, sodium fluoride and hydrofluoric acid After reacting for 10 minutes in the treatment solutions with molar concentrations of 1.6mol / L and 4.8mol / L, the samples were taken out, washed with water and alcohol, and then dried in the air.

[0030] as attached image 3 As shown, the immersion test in SBF solution shows that the sodium magnesium fluoride film can significantly reduce the hydrogen evolution rate of the matrix magnesium alloy.

[0031] The observation of the sodium magnesium fluoride film on the surface of the biological magnesium alloy sample with a scanning electron microscope shows that the sodium magnesium fluoride film is composed of sodium magnesium fluoride particles that are approximately cubic, and the average edge length of the sodium magnesiu...

Embodiment 3

[0033] A method for preparing a bio-magnesium alloy whose surface is coated with a magnesium-sodium-fluoride film, firstly immersing a degreasing and water-washed Mg-Nd-Zn-Zr magnesium alloy sample in a solution of 80°C, sodium fluoride and hydrofluoric acid After reacting for 60 minutes in the treatment solutions with molar concentrations of 1.6mol / L and 4.8mol / L, the samples were taken out, washed with water and alcohol, and dried in the air.

[0034] Observation of the morphology of the sodium magnesium fluoride film on the surface of the biological magnesium alloy sample with a scanning electron microscope shows that the sodium magnesium fluoride film is composed of approximately cubic sodium magnesium fluoride particles. Potassium permanganate (0.5 g / L) and Nitric acid (30 ml / L) solution titration shows that its discoloration time is 5.3 times that of the matrix magnesium alloy.

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Abstract

The invention relates to a biological magnesium alloy with a surface coated with a sodium magnesium fluoride film and a preparation method thereof. The surface of the biological magnesium alloy is coated with the sodium magnesium fluoride film. The preparation method of the biological magnesium alloy comprises the following steps: carrying out alkaline oil removal; washing; preparing the sodium magnesium fluoride film; washing; washing by using alcohol; air-drying. The method for preparing the sodium magnesium fluoride film particularly comprises the following steps: immersing the biological magnesium alloy into a treatment solution with the temperature of 75-90 DEG C and the molar concentration of sodium fluoride and hydrofluoric acid respectively equal to 1.6 mol / L and 4.8 mol / L; performing heat preservation for 10-90 minutes, and then taking out the biological magnesium alloy. According to the biological magnesium alloy with the surface coated with the sodium magnesium fluoride film, the sodium magnesium fluoride film has the characteristics of simple preparation process, convenience for operation, suitability for industrial production, and the like, and can be used for the surface modification coating of a magnesium alloy; the biological magnesium alloy disclosed by the invention can be used for preparing a biological magnesium alloy device.

Description

technical field [0001] The invention relates to the technical field of biomaterials, and is particularly suitable for the field of surface modification of biomagnesium alloy devices, in particular to a biomagnesium alloy whose surface is coated with a magnesium sodium fluoride film and a preparation method thereof. Background technique [0002] Magnesium is an essential constant element for the human body. Magnesium alloys are biodegradable, dense (1.74g.cm -3 ) and human bone (1.75g.cm -3 ), Young's modulus (45GPa) close to that of human bone (20GPa), high specific strength and specific stiffness, etc., it is a metal material with broad application prospects in biological implant devices such as bone plates, bone nails, and vascular stents. However, due to the high chemical activity of magnesium, the corrosion resistance of magnesium alloys is poor. On the one hand, the service life of magnesium alloy biological implants does not match its expected service life. Alkalizat...

Claims

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Application Information

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IPC IPC(8): C23C22/34B32B15/04C22C23/00A61L27/30A61L31/08
Inventor 方信贤章晓波王强王章忠
Owner 江苏凯晞投资有限公司
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