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A kind of magnesium-based metal material conversion film and preparation method thereof

A magnesium-based metal, conversion coating technology, applied in the field of medical materials, can solve the problems of low structural stability, poor long-term corrosion resistance, etc., and achieves easy control of raw material dosage, good long-term corrosion resistance, and universality. wide effect

Active Publication Date: 2020-03-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above prior art, the present invention provides a magnesium-based metal material conversion coating and its preparation method to solve the technical problems of low structural stability and poor long-term corrosion resistance

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  • A kind of magnesium-based metal material conversion film and preparation method thereof
  • A kind of magnesium-based metal material conversion film and preparation method thereof

Examples

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Embodiment 1

[0026] A magnesium-based metal material conversion film, the conversion film includes a Mg-Si alloy substrate and a polyphenol-organic conversion layer attached to the surface of the Mg-Si alloy substrate; the polyphenol-organic conversion layer has 3 layers, and is composed of tanshinone (Tanshinone) and Mg 2+ chelated with each other. The magnesium-based metal material conversion coating is prepared through the following steps:

[0027] (1) Carry out polishing, cleaning and drying treatment to Mg-Si alloy substrate successively, obtain magnesium-based material;

[0028] (2) Soak the magnesium-based material in a NaOH solution with a temperature of 70°C and a concentration of 3M, take it out after reacting for 30 minutes, wash it with absolute ethanol, then dry it with nitrogen, and put it in a vacuum drying box for standby;

[0029] (3) Submerge the magnesium-based material treated in step (2) in a tanshinone solution with a pH of 8.0 and a concentration of 0.01 mM, and th...

Embodiment 2

[0032] A magnesium-based metal material conversion coating, the conversion coating comprises a MgZnMg alloy base material and a polyphenol-organic conversion layer attached to the surface of the MgZnMg alloy base material; the polyphenol-organic conversion layer has 3 layers, and consists of catechol ( CA) and Mg 2+ chelated with each other. The magnesium-based metal material conversion coating is prepared through the following steps:

[0033] (1) sequentially polishing, cleaning and drying the MgZnMg alloy substrate to obtain a magnesium-based material;

[0034] (2) Soak the magnesium-based material in a NaOH solution with a temperature of 60°C and a concentration of 3M, take it out after reacting for 35 minutes, wash it with absolute ethanol, then dry it with nitrogen, and put it in a vacuum drying oven for standby;

[0035] (3) Submerge the magnesium-based material treated in step (2) in a CA solution with a pH of 9.0 and a concentration of 1 mM, and then place it in a wa...

Embodiment 3

[0038] A magnesium-based metal material conversion coating, the conversion coating includes an AZ91 magnesium alloy base material and a polyphenol-organic conversion layer attached to the surface of the AZ91 magnesium alloy base material; the polyphenol-organic conversion layer has two layers, and consists of epicatechin Ethyl Gallate (ECG) and Mg 2+ chelated with each other. The magnesium-based metal material conversion coating is prepared through the following steps:

[0039] (1) Carry out polishing, cleaning and drying treatment to AZ91 magnesium alloy substrate successively, obtain magnesium-based material;

[0040] (2) Soak the magnesium-based material in a NaOH solution with a temperature of 65°C and a concentration of 3M, take it out after reacting for 35 minutes, wash it with absolute ethanol, then dry it with nitrogen, and put it in a vacuum drying oven for later use;

[0041](3) Immerse the magnesium-based material treated in step (2) in an ECG solution with a pH o...

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Abstract

The invention discloses a magnesium-based metal material conversion film and a preparation method thereof. The conversion film is mainly composed of a polyphenol organic conversion layer on the surface of a magnesium base material. The preparation method is as follows: (1) pretreatment of the magnesium metal substrate, followed by sandpaper polishing, NaOH activation, dopamine soaking, etc.; (2) cleaning the pretreated sample with deionized water at room temperature, and immersing it in polyphenolic compound and magnesium After reacting in the mixed salt solution for 2-15 minutes, ultrasonically clean with ethanol to complete a reaction cycle; repeat the reaction cycle 3-5 times to obtain a magnesium-based metal material conversion film. The conversion film prepared by the preparation method of the present invention can effectively solve the technical problems of low structural stability and poor long-term corrosion resistance of the conversion film, and the polyphenolic compound helps to capture excess active oxygen in the body and protect the body from attacked by reactive oxygen species. The conversion coating can be applied to the surface modification research of fully degradable magnesium-based metal cardiovascular stents and fully degradable magnesium-based orthopedic filling materials.

Description

technical field [0001] The invention belongs to the technical field of medical materials, and in particular relates to a magnesium-based metal material conversion film and a preparation method thereof. The conversion coating can be applied to the surface modification research of fully degradable magnesium-based metal cardiovascular stents and fully degradable magnesium-based orthopedic filling materials. Background technique [0002] Magnesium-based metal materials are often used as medical functional materials due to their good biocompatibility, biodegradability, low thrombogenicity, and low inflammatory response. However, in the actual use process, it was found that when the magnesium-based metal material is used directly, its degradation rate is too fast, and it has been excessively degraded before the biological tissue is completely repaired, resulting in a decrease in mechanical strength and failing to achieve the purpose of treatment. [0003] In the prior art, the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/68C23C22/60C23C22/73
CPCC23C22/60C23C22/68C23C22/73
Inventor 王云兵罗日方
Owner SICHUAN UNIV
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