Magnesium-based metal material conversion film and preparation method thereof

A magnesium-based metal and conversion coating technology, applied in the field of medical materials, can solve the problems of poor long-term corrosion resistance and low structural stability, and achieve the effects of good long-term corrosion resistance, easy adjustment of the amount of raw materials added, and simple operation.

Active Publication Date: 2018-12-21
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 an

Method used

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  • Magnesium-based metal material conversion film and preparation method thereof
  • Magnesium-based metal material conversion film and preparation method thereof

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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 the magnesium base material; the preparation method comprises the following steps that (1) the magnesium metal base material is pretreated, and abrasive paper polishing, NaOH activation, dopaminesoaking and the like are carried out sequentially; (2) the pretreated sample is cleaned by using deionized water at room temperature, and is immersed in a mixed solution of a polyphenol compound anda magnesium salt for reacting for 2-15 minutes, ultrasonically cleaning with ethanol is carried out to complete a reaction cycle; a reaction period is repeated for 3-5 times to obtain the magnesium-base metal material conversion film. The conversion film prepared by the preparation method can effectively solve the problems that the structural stability of the conversion film is not high, and the poor long-term corrosion resistance can be solved; and the polyphenol compound can be used for capturing excessive active oxygen in a body and protecting the body from being attacked by active oxygen;the conversion film can be applied to surface modification research of a fully-degradable magnesium-based metal cardiovascular stent and a fully-degradable magnesium-based orthopedic filling material.

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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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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