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A kind of surface coating that can improve the corrosion resistance of medical magnesium alloy and its preparation method

A technology of corrosion resistance and surface coating, applied in the field of surface coating and its preparation that can improve the corrosion resistance of medical magnesium alloys, can solve the problem of unsatisfactory corrosion resistance, unsatisfactory coating performance stability, and complicated preparation process etc. to achieve good controllable degradation, ideal corrosion resistance, and low preparation cost

Active Publication Date: 2021-06-25
苏州市美新迪斯医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of preparing coatings, these existing methods are prone to produce heavy metal ions, phosphate ions and other substances that pollute the environment, and the preparation process is complicated, the performance stability of the prepared coatings is not ideal, and the corrosion resistance effect is not ideal.

Method used

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  • A kind of surface coating that can improve the corrosion resistance of medical magnesium alloy and its preparation method
  • A kind of surface coating that can improve the corrosion resistance of medical magnesium alloy and its preparation method
  • A kind of surface coating that can improve the corrosion resistance of medical magnesium alloy and its preparation method

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Embodiment 1

[0032] A method for preparing a surface coating capable of improving the corrosion resistance of medical magnesium alloys, comprising the following steps:

[0033] (1) Using Mg-Zn alloy as the base material, wire-cut the Mg-Zn as-cast sample into a Φ35×100mm cylinder, polish it with sandpaper, and place it in a mixture of ethanol and acetone (the volume ratio of ethanol and acetone is 1:1) for ultrasonic cleaning for 10 minutes, then placed in deionized water for ultrasonic cleaning for 5 minutes, after cleaning, set aside;

[0034] (2) Under pressurized conditions, the high-purity CO 2 The gas is passed into deionized water at room temperature, with a flow rate of 1L / min, for 8 minutes continuously, to make a carbonated aqueous solution with a pH of 4.2;

[0035] (3) Place the Mg-Zn alloy matrix treated in step (1) in the aqueous carbonate solution prepared in step (2) for ultrasonic treatment, wherein the temperature is controlled at 35°C, the ultrasonic frequency is 45kHz,...

Embodiment 2

[0039] A method for preparing a surface coating capable of improving the corrosion resistance of medical magnesium alloys, comprising the following steps:

[0040] (1) Using Mg-Ca alloy as the base material, the Mg-Ca as-cast sample was wire-cut into a Φ35×100mm cylinder, polished with sandpaper, and placed in a mixture of ethanol and acetone (the volume ratio of ethanol and acetone is 1:1) for ultrasonic cleaning for 10 minutes, then placed in deionized water for ultrasonic cleaning for 5 minutes, after cleaning, set aside;

[0041] (2) Under pressurized conditions, the high-purity CO 2 The gas is passed into deionized water at room temperature, with a flow rate of 1.5 L / min, and continuously passed through for 5 minutes to make a carbonated aqueous solution with a pH of 4.5;

[0042](3) Place the Mg-Ca alloy matrix treated in step (1) in the aqueous carbonate solution prepared in step (2) for ultrasonic treatment, wherein the temperature is controlled at 40°C, the ultrasoni...

Embodiment 3

[0046] A method for preparing a surface coating capable of improving the corrosion resistance of medical magnesium alloys, comprising the following steps:

[0047] (1) Using Mg-Sr alloy as the base material, wire-cut the Mg-Sr as-cast sample into a Φ35×100mm cylinder, polish it with sandpaper, and place it in a mixture of ethanol and acetone (the volume ratio of ethanol and acetone is 1:1) for ultrasonic cleaning for 10 minutes, then placed in deionized water for ultrasonic cleaning for 5 minutes, after cleaning, set aside;

[0048] (2) Under pressurized conditions, the high-purity CO 2 The gas is passed into deionized water at room temperature, with a flow rate of 2L / min, for 10 minutes continuously, to make a carbonated aqueous solution with a pH of 4.0;

[0049] (3) Place the Mg-Sr alloy matrix treated in step (1) in the aqueous carbonate solution prepared in step (2) for ultrasonic treatment, wherein the temperature is controlled at 45°C, the ultrasonic frequency is 50kHz...

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Abstract

The invention discloses a preparation method of a surface coating capable of improving the corrosion resistance of medical magnesium alloy, comprising the following steps: (1) taking magnesium alloy as a base material, grinding with sandpaper, and carrying out ultrasonic cleaning; (2) preparing carbonic acid (3) placing the magnesium alloy substrate in an aqueous carbonate solution for ultrasonic treatment to form a basic magnesium carbonate film on the surface of the magnesium alloy substrate; (4) placing the magnesium alloy substrate treated in step (3) in a water bath In the process, heat treatment is performed to form a dense magnesium oxide layer on the surface of the magnesium alloy substrate; (5) the magnesium alloy substrate processed in step (4) is placed in a sodium silicate solution for sealing treatment. The preparation method is simple and easy to operate, has low preparation cost, does not produce substances that easily pollute the environment, and the prepared coating is uniform and dense, with ideal corrosion resistance, good performance stability and good biocompatibility.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, in particular to a surface coating capable of improving the corrosion resistance of medical magnesium alloys and a preparation method thereof. Background technique [0002] Magnesium and magnesium alloys have many properties superior to existing biomedical metal materials. Its specific advantages are: [0003] First, good biocompatibility, a property especially indispensable in bone metabolism. The normal content of magnesium in the human body is 25g, half of which exists in the bones, and the normal serum magnesium concentration is 1.5-2.5mm / mol. It participates in almost all metabolic activities of the human body, including the formation of bone cells, accelerating bone healing, and activating the body. Various enzymes are involved in protein synthesis, muscle contraction and temperature regulation. [0004] Second, excellent mechanical properties can alleviate the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/57C23C22/83C23C22/73A61L27/04A61L27/30A61L27/50A61L27/58
CPCA61L27/047A61L27/306A61L27/50A61L27/58A61L2430/02C23C22/57C23C22/73C23C22/83
Inventor 杨健
Owner 苏州市美新迪斯医疗科技有限公司
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