System and method for preparing hydroxyapatite through ion exchange membrane assisted electrochemical deposition

By using ion exchange membrane-assisted electrochemical deposition technology and employing electric field focusing and stepwise ion doping strategies, a fluorine-zinc co-doped hydroxyapatite coating with integrated corrosion resistance and antibacterial functions was prepared on the surface of magnesium alloy. This solved the problems of insufficient initial protection and unstable interfacial bonding of hydroxyapatite coatings in existing methods, and enabled full life cycle regulation of the magnesium alloy surface.

CN122235797APending Publication Date: 2026-06-19LANXI MAGNESIUM MATERIALS RESEARCH INSTITUTE
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Patent Information

Application Number
CN202610547594.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-23
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing methods for preparing hydroxyapatite have limitations in the initial protection, unstable interfacial bonding, and difficulty in functional regulation when modifying magnesium alloy surfaces, making it difficult to meet the precise control requirements throughout the entire life cycle of implant materials.

Method used

An ion-exchange membrane-assisted electrochemical deposition technique was employed to create a weakly alkaline environment through the ion-exchange membrane. An electric field was used to focus and drive the directional migration of ions, and F- and Zn²+ were doped stepwise to grow a fluorine-zinc co-doped hydroxyapatite coating with consistent orientation on a magnesium alloy micro-arc oxide layer.

Benefits of technology

This technology integrates the corrosion resistance and antibacterial function of hydroxyapatite coating, improves the mechanical properties and biocompatibility of magnesium alloys, and meets the protection requirements throughout the entire life cycle.

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Abstract

The invention provides a system and a method for preparing hydroxyapatite through ion exchange membrane assisted electrochemical deposition, a magnesium alloy matrix with a micro-arc oxidation coating is placed in a buffer area for at least one round of electrochemical deposition, and each round of electrochemical deposition comprises the following steps: opening a channel between an anion area and the buffer area; meanwhile, the magnesium alloy matrix is connected with the positive electrode of a pulse power supply arranged in the buffer area, the platinum electrode in the anion area is connected with the negative electrode of the pulse power supply for primary electro-deposition, then a channel between the cation area and the buffer area is closed, the channel between the cation area and the buffer area is opened, and the magnesium alloy matrix is connected with the negative electrode of the pulse power supply; a platinum electrode in the cation area is connected with a positive electrode of a pulse power supply for secondary electrodeposition, and preferential nucleation and C-axis preferential growth of hydroxyapatite at the bottom of the MAO micropore are realized through a step-by-step ion migration control and electric field focusing technology.
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