Method for promoting biological corrosion resistance of magnesium alloy bone fracture plate

Abstract

The invention relates to a method for promoting biological corrosion resistance of a magnesium alloy bone fracture plate. The method comprises the following steps: S1) establishing a magnesium alloy bone fracture plate finite element model and confirming a stress concentration part; S2) using an abrasive paper for grinding the surface of the magnesium alloy bone fracture plate, using acetone for cleaning and then drying; S3) sticking the stress concentration part of the magnesium alloy bone fracture plate to an aluminum foil absorbing layer, clamping on a robot with a laser shot blasting system, setting a laser parameter and a shot blasting route, and performing shot blasting strengthening on the stress concentration part; S4) placing the magnesium alloy bone fracture plate after shot blasting into absolute ethyl alcohol or acetone for ultrasonic cleaning, and then using nitrogen for drying; S5) taking the dried magnesium alloy bone fracture plate as an anode and soaking in an electrolyte, taking micro-arc oxidation stainless steel electrolytic cell as a cathode, adopting a constant voltage mode for reacting the electrolyte for 5min under the condition below 40 DEG C, and then taking out the bone fracture plate, using deionized water for cleaning and then drying. According to the invention, a laser shot blasting method is adopted for effectively promoting the biological corrosion resistance of the magnesium alloy.

Description

technical field [0001] The invention relates to the field of metal surface laser compound modification, in particular to a method for improving the biocorrosion resistance of a magnesium alloy bone plate. Background technique [0002] The mechanical properties of magnesium alloys are very similar to those of human bones and have excellent biocompatibility, which has broad application prospects in the field of biomedicine. Choosing magnesium alloy as the supporting material for postoperative bone recovery can reduce the stress shielding effect and reduce the incidence of chronic inflammation. At the same time, due to the biodegradable properties of the magnesium alloy, secondary operations after bone healing can be avoided. However, the serious corrosion of magnesium alloys in body fluids, and the hydrogen produced by the corrosion of magnesium alloys can cause complications, which limits its clinical application. Many schemes have been proposed to improve the corrosion res...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defect that the existing magnesium alloy bone plate corrodes too fast in the internal environment and cannot provide sufficient strength during the healing period of the bone tissue, the present invention provides a method for improving the biocorrosion resistance of the magnesium alloy bone plate, which can be widely used in The surface treatment of magnesium alloy materials enables magnesium alloy parts to obtain better corrosion resistance

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