Multi-coating composite material taking magnesium/magnesium alloy as matrix and preparation method of multi-coating composite material

Abstract

The invention discloses a multi-coating composite material taking a magnesium / magnesium alloy as a matrix. The multi-coating composite material is of a laminar structure, and is composed of the magnesium / magnesium alloy matrix, a micro-arc oxidized film coating, a strong positive electricity precursor coating and a mixed coating in sequence from inside to outside; the mixed coating also comprises five layers and all the layers are stacked in sequence; one lower secondary layer is coated on one upper secondary layer; each layer is of a composite structure of a modified tin dioxide coating and a negative electricity polyelectrolyte coating, wherein the corresponding negative electricity polyelectrolyte coating is coated with the modified tin dioxide coating. The invention further discloses a preparation method of the multi-coating composite material; the preparation method comprises the following steps: a polishing treatment step, a pre-treatment step, a strong positive electricity precursor preparation step, a layer-by-layer assembling step of modified tin dioxide and a self-assembling step of the negative electricity polyelectrolyte and modified tin dioxide mixed coating. According to the multi-coating composite material, nano SnO2 is prepared and a preparation process is simple, easy to control and high in rate of finished products.

Description

technical field [0001] The invention relates to a multi-coat composite material and a preparation method thereof, in particular to a multi-coat composite material with magnesium / magnesium alloy as a matrix and a preparation method thereof. Background technique [0002] Magnesium alloys have good biocompatibility and mechanical compatibility, the degradability and bioactivity characteristics of third-generation medical materials, and properties that other metal-based biomaterials and degradable polymer materials do not have. Therefore, magnesium alloys have broad development prospects as a new generation of medical implant materials. However, since magnesium itself is very active and chemically unstable, it will rapidly undergo corrosion and degradation in the body, causing a series of problems. Therefore, when magnesium or magnesium alloy is used as an implant material in the body, its anti-corrosion treatment is one of the technical problems that need to be solved first. ...

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Problems solved by technology

[0004] 2) The excessively fast corrosion rate of the magnesium alloy also leads to a rapid increase in the pH value of the solution, which is potentially harmful to the growth of human bones and tissues

[0005] 3) Excessive corrosion will also cause the implant to lose its mechanical integrity before the human tissue is fully healed, thereby causing rapid deterioration of mechanical properties (such as tensile strength, compressive yield strength and fatigue strength)

However, the surface-modified magnesium alloy products produced by the prior art have many deficiencies, mainly in the comprehensive performance indicators such as corrosion resistance, biocompatibility, binding force, and durability. , its practical effect is not particularly ideal

[0008] In the prior art, other surface anticorrosion treatment methods for magnesium alloys, such as electroless plating, electroplating, chemical conversion coating, micro-arc oxidation, ion implantation, vapor deposition, etc., generally have little improvement in corrosion resistance and porosity. Disadvantages or problems such as poor biocompatibility

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