Preparation and Properties of UMAO/ZrO2/BCP-CA Composite Coating on Magnesium

WANG Jingyan; ZHANG Deqiu; LI Muqin

doi:10.16490/j.cnki.issn.1001-3660.2025.15.014

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Surface Technology ›› 2025, Vol. 54 ›› Issue (15) : 156-164. DOI: 10.16490/j.cnki.issn.1001-3660.2025.15.014

Technology and Application

Preparation and Properties of UMAO/ZrO₂/BCP-CA Composite Coating on Magnesium

WANG Jingyan¹, ZHANG Deqiu^{1, 2, *}, LI Muqin²

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Abstract

Bone defect materials can be used to repair and replace damaged tissues and are urgently needed by people. Due to the scarcity of suitable bone repair materials, there is an urgent need for breakthroughs in the research of bone repair materials used in bone transplantation surgery. Among them, metal materials with excellent mechanical properties play an important role in bone repair materials due to their stable support ability. Degradable medical magnesium alloys have attracted the attention of many researchers, but magnesium alloys degrade too quickly in physiological environments. The surface of magnesium alloys prepared by various surface technologies not only improves the corrosion resistance of magnesium alloys, but also has functional properties such as biological activity and antibacterial properties. Micro arc oxidation method is one of the surface modification methods, which has become a research hotspot in recent years due to its advantages such as high bonding strength with the substrate and adjustable typical porous structure. However, micro arc oxidation coatings may crack in simulated liquid environments, which reduces the corrosion resistance of coatings. When other surface techniques are used for micro arc oxidation post-treatment sealing, the coating after sealing not only maintains the advantages of micro arc oxidation coating, but also further improves the corrosion resistance and biocompatibility. The work aims to use photochemical sol gel technology for the micro arc oxidation sealing, which can improve the corrosion resistance of the coating. BCP has biocompatibility, biological activity, and adjustable biodegradability. CA can promote the proliferation and differentiation of osteoblasts. In order to endow the coating with functionality, for the first time, BCP and CA were loaded onto the UMAO/ZrO₂ intermediate layer with silane coupling method. The UMAO/ZrO₂/BCP-CA functional coating with corrosion resistance, bone induction and anti-inflammatory properties was prepared through the combination of UMAO technology, photochemical sol gel technology and silane coupling method. The surface morphology and organizational structure of various samples were studied by scanning electron microscopy, X-ray diffractometer, Fourier transform infrared spectroscopy, contact angle measuring instrument, friction and wear testing machine and automatic scratch tester. The corrosion resistance and biological activity of different coatings were also studied and evaluated. The main phase composition of the UMAO/ZrO₂/BCP-CA coating was MgO, Mg₂SiO₄, ZrO₂, Ca₁₀(PO₄)₆(OH)₂ and Ca₃(PO₄)₂. The main elemental composition of the UMAO/ZrO₂/BCP-CA coating was O, C, Mg, Si, Ca, and P in simulated body fluid(SBF). The UMAO/ZrO₂/BCP-CA coating was a hydrophobic surface, of which the contact angle was 91.52°, higher than 32.26° of the UMAO coating. The critical load of the UMAO/ZrO₂/BCP-CA coating was 14 N, which was greater than 8.5 N of the UMAO coating. Electrochemical corrosion experiments showed that the corrosion current density (I_corr) of Mg and UMAO/ZrO₂/BCP-CA coating was 17.569×10^-6 A/cm² and 0.274×10^-6 A/cm² in SBF environment, respectively. The Icorr of the UMAO/ZrO₂/BCP-CA coating was much lower than that of Mg, UMAO/ZrO₂/BCP-CA coating has excellent corrosion resistance. The degradation of coating materials and the deposition of substances are in equilibrium with each other. The UMAO/ZrO₂/BCP-CA coating is not easily wetted by SBF, which can reduce the contact between the corrosive solution and the coating surface. At the same time, it has excellent corrosion resistance and biological activity.

Key words

magnesium / ZrO₂ / biphasic calcium phosphate / chlorogenic acid / ultrasonic micro arc oxidation / photochemical / corrosion resistance / biological activity

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WANG Jingyan, ZHANG Deqiu, LI Muqin. Preparation and Properties of UMAO/ZrO₂/BCP-CA Composite Coating on Magnesium[J]. Surface Technology. 2025, 54(15): 156-164 https://doi.org/10.16490/j.cnki.issn.1001-3660.2025.15.014

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