Preparation method of calcium carbonate film layer on surface of biomedical degradable metal material
A metal material and biomedical technology, which is applied in the preparation of calcium carbonate film on the surface of biomedical degradable metal materials, and in the field of modified coatings, can solve the problems of insufficient corrosion resistance and protection performance, and achieve excellent biocompatibility and preparation The method is simple and gentle, and the effect of controllable shape
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Embodiment 1
[0030] Embodiment 1: a kind of preparation method of biomedical degradable metal material surface calcium carbonate film layer, comprises the following steps:
[0031] S1. Pretreatment of the surface of medical metal materials: Use water-grinding paper to polish the surface of the magnesium alloy step by step, then ultrasonically clean it with absolute ethanol for 5-10 minutes, and dry it with air;
[0032] S2, the preparation of mixed solution: prepare calcium chloride, the mixed solution of sodium carbonate concentration of 50mM with water, adjust the pH value of mixed solution to 7.3 with dilute NaOH solution;
[0033] S3. Preparation of the film layer: immerse the magnesium alloy pretreated in step S1 into the mixed solution prepared in step S2, heat it at a constant temperature to 80°C, keep it for 2 hours, take out the magnesium alloy and rinse it with deionized water, and dry it naturally , that is, a calcium carbonate film is prepared on the surface of the magnesium al...
Embodiment 2
[0036] Embodiment 2: a kind of preparation method of biomedical degradable metal material surface calcium carbonate film layer, comprises the following steps:
[0037] S1. Pretreatment of the surface of medical metal materials: Use water-grinding paper to polish the surface of the magnesium alloy step by step, then ultrasonically clean it with absolute ethanol for 5-10 minutes, and dry it with air;
[0038] S2, the preparation of mixed solution: prepare the mixed solution of calcium chloride, sodium carbonate, magnesium sulfate concentration all is 50mM with water, adjust the pH value of mixed solution to 7.3 with dilute NaOH solution;
[0039] S3. Preparation of the film layer: immerse the metal material pretreated in step S1 into the mixed solution prepared in step S2, heat it at a constant temperature to 80°C, keep it for 2 hours, take out the magnesium alloy and rinse it with deionized water, and dry it naturally , that is, a calcium carbonate film is prepared on the surfa...
Embodiment 3
[0043] The difference between the steps in the preparation method and Example 2 is: the calcium chloride with a concentration of 50 mM in the mixed solution in step S2 is replaced with calcium acetate with a concentration of 50 mM to obtain a calcium carbonate film layer with better corrosion resistance.
[0044] The prepared calcium carbonate film has an effective thickness of 3-5 μm, and the calcium carbonate film can increase the electrochemical corrosion resistance of the magnesium alloy by 8 times after being tested in artificial simulated body fluid for 3 days.
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