Preparation method of magnesium alloy surface coating and magnesium alloy

A technology of surface coating and magnesium alloy, applied in the field of magnesium alloy, can solve the problems of ceramic coating corrosion resistance and hardness to be improved, and achieve the effect of great research significance and good application prospect

Inactive Publication Date: 2019-02-26
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, as an artificial plastic material in medicine, the corrosion resistance and hardness of the ceramic coating made by the above-mentioned micro-arc oxidation coating method still need to be improved.

Method used

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  • Preparation method of magnesium alloy surface coating and magnesium alloy
  • Preparation method of magnesium alloy surface coating and magnesium alloy
  • Preparation method of magnesium alloy surface coating and magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The preparation method of the magnesium alloy surface coating of the present embodiment comprises the following processes:

[0056] A. The surface of the magnesium alloy substrate is ground and polished.

[0057] The material of the test piece selected in this embodiment is AZ31 magnesium alloy, wherein the content of magnesium is as high as 95%. The composition of the main elements of the specimen is shown in Table 1.

[0058] Table 1 Nominal composition (mass fraction)% of main elements of AZ31 magnesium alloy

[0059] Al

[0060] In this embodiment, the AZ31 magnesium alloy of 25mm × 25mm × 6.5mm is selected, and it is polished with 240, 400, 600, 800, 1200 mesh sandpaper respectively, and after polishing, the surface of the magnesium alloy is polished with a PG2A metallographic sample polishing machine Treatment, polishing until the surface of the magnesium alloy is mirror-like and free of scratches.

[0061] B. Perform micro-arc oxidation treatment on the...

Embodiment 2

[0094] The main difference between this embodiment and embodiment one is the sol-gel process of step C, and the process of step C of this embodiment is as follows:

[0095] ①Weigh 9.8-9.9g of calcium nitrate and 1.75-1.8g of phosphorus pentoxide, and dissolve them in 25ml of absolute ethanol;

[0096] ② Slowly add the alcoholic solution of calcium nitrate to the alcoholic solution of phosphorus pentoxide, adjust the pH value to 7.1-7.3 with ammonia water, and magnetically stir for 20-40min, and finally stand at room temperature to obtain a sol solution.

[0097] ③Immerse the magnesium alloy with micro-arc oxidation coating in the sol solution for 20-40s, rotate or pull, bake at 70°C-80°C for 7-15min, and cool to room temperature;

[0098] ④Repeat step ③ multiple times according to different needs to form a semi-solidified gel film on the surface of the magnesium alloy;

[0099] ⑤ Carry out heat treatment on the magnesium alloy, place the magnesium alloy in the furnace, raise ...

Embodiment 3

[0102] This example introduces a magnesium alloy prepared according to the method of the above example, its surface has a micro-arc oxidation coating made by a micro-arc oxidation process, and the surface of the micro-arc oxidation is covered with a coating made by a sol-gel process. sol-gel coating. The magnesium alloy is AZ31 magnesium alloy, the magnesium content of which is more than 95%.

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Abstract

The invention relates to surface modification of biological materials of magnesium alloys, in particular to a preparation technology of a surface coating of a magnesium alloy and the magnesium alloy prepared with the technology. A preparation method of the surface coating of the magnesium alloy comprises steps as follows: A, the surface of a magnesium alloy matrix is subjected to grinding and polishing treatment; B, the magnesium alloy matrix is subjected to micro-arc oxidation treatment, and a micro-arc oxidation coating is formed on the surface of the magnesium alloy matrix; C, the micro-arc oxidation coating surface in the step B is subjected to sol-gel pore sealing treatment, a sol-gel coating is formed, the porosity of surface micro-pores is reduced, and the micro-pores are reduced. According to the micro-arc oxidation-sol-gel composite coating technology, micro-arc oxidation treatment is performed on the surface of the magnesium alloy firstly, the coating containing Ca / P elements is prepared, and then sol-gel pore sealing treatment is performed on the coating. The corrosion resistance characteristic of the composite coating is obviously superior to that of the micro-arc oxidation coating, so that the composite coating has the great research significance and the bright application prospect.

Description

technical field [0001] The invention relates to surface modification of magnesium alloy biomaterials, in particular to a preparation method of a magnesium alloy surface coating and a magnesium alloy prepared by the method. Background technique [0002] Magnesium and its alloys have good biocompatibility, their density and Young's modulus are the closest to those of human bones, and their degraded products are non-toxic to the human body and can be excreted through body fluids, etc., which have been recognized by the medical community It is a revolutionary artificial plastic material. However, its rapid degradation rate in body fluids does not match the surrounding new tissue and healing rate, which limits its application in biomedicine. Therefore, reducing the corrosion rate of magnesium and its alloys has become the key to research, and it is also a hot topic of research by scholars at home and abroad. [0003] The methods to reduce the corrosion rate of magnesium and its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30
CPCC25D11/026C25D11/30
Inventor 顾艳红杨晓宇马慧娟杨远航吴纯坤钮艳
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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