Fluorine-free self-adaptive bio-friendly magnesium alloy micro-arc oxidation coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of biomedical magnesium alloy surface treatment, and particularly relates to a fluoride-free self-adaptive biological-friendly magnesium alloy micro-arc oxidation coating as well as a preparation method and application thereof. The preparation method comprises the following steps: connecting a magnesium alloy with an anode of a micro-arc oxidation power supply, connecting a conductive substrate with a cathode, and carrying out micro-arc oxidation treatment in a micro-arc oxidation electrolyte consisting of soluble silicate, a phosphate radical-containing solution and sodium hydroxide (or potassium hydroxide), so as to prepare the fluorine-free self-adaptive bio-friendly magnesium alloy micro-arc oxidation coating on the surface of the magnesium alloy. According to the method, the soluble silicate-phosphate electrolyte which does not contain fluorine elements is designed, the self-compacting micro-arc oxidation coating is generated on the surface of the magnesium alloy, the compactness of the coating is improved, the damaged part of the coating is blocked by a degradation product in the degradation period, and the purpose of self-repairing of the coating is achieved; the magnesium alloy can still be effectively protected after the coating is soaked in simulated body fluid for more than 3 months, and the long-term corrosion resistance and biocompatibility of the coating are greatly improved.

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