A kind of multi-coating composite material with magnesium/magnesium alloy as matrix and preparation method thereof

Abstract

The invention discloses a multi-coating composite material with a magnesium / magnesium alloy as a matrix. The multi-coating composite material is a layered structure, and is composed of a magnesium / magnesium alloy matrix and a micro-arc oxidation film coating from the inside to the outside. , a strong positive charge precursor coating and a mixed coating, the mixed coating further includes five layers, each layer is layered in turn, the next layer is coated on the upper layer, and each layer is layered. Both are composite structures of modified tin dioxide coating and significantly negatively charged polyelectrolyte coating, wherein the modified tin dioxide coating is coated on the corresponding significantly negatively charged polyelectrolyte coating. The invention also discloses a preparation method of the multi-coating composite material, which comprises the following steps: a polishing treatment step, a pretreatment step, a preparation step of a strong positive electric precursor, a layer-by-layer assembly step of the modified nano-tin dioxide and Self-assembly steps of a significantly negatively charged polyelectrolyte and modified tin dioxide hybrid coating. Using the invention to prepare nano SnO2 has the advantages of simple preparation process, easy control and high yield.

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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