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<p>Although micro arc oxidation (MAO) could improve the corrosion resistance of Mg alloys, the porous structure of the MAO coating is usually harmful to their corrosion resistance. Thus, to further improve the corrosion resistance of MAO coating on the surface of degradable ZK60 alloy, potassium fluorozirconate (K<sub>2</sub>ZrF<sub>6</sub>) treatment as a post-processing method was employed on the MAO coating. The effects of the concentration of K<sub>2</sub>ZrF<sub>6</sub> on the microstructure and corrosion resistance of the MAO/K<sub>2</sub>ZrF<sub>6</sub> composite coating were investigated. The results showed that a triple layered composite coating was formed from the outside to the inside, and of the sequence: K<sub>2</sub>ZrF<sub>6</sub> layer, MAO layer and then MgF<sub>2</sub> layer. The corrosion resistance of the MAO coating was significantly improved obviously after the K<sub>2</sub>ZrF<sub>6</sub> treatment, as opposed to the lowest corrosion rate exhibited by the composite coating when the concentration of K<sub>2</sub>ZrF<sub>6</sub> was 30&#xa0;g/L. Meanwhile, as the concentration of K<sub>2</sub>ZrF<sub>6</sub> was further increased, the deposition of K<sub>2</sub>ZrF<sub>6</sub> coating was not uniform due to the formation of large crystalline particles. In addition, the cell relative growth rate (RGR) of the MAO/K<sub>2</sub>ZrF<sub>6</sub> coated samples exceeded 90%, showing good cytocompatibility.</p>

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Microstructure, In Vitro Degradation and Cytocompatibility of Micro-Arc Oxidation (MAO)/K2ZrF6 Composite Coating on ZK60 Alloy with K2ZrF6 as Post Treatment

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Ronglin Gan,
  • Ruyan Wang,
  • Sharafadeen Kunle Kolawole,
  • Muhammad Ali Siddiqui,
  • Honghui Cheng,
  • Yang Yang,
  • Junxiu Chen,
  • Mingyue Huo

摘要

Although micro arc oxidation (MAO) could improve the corrosion resistance of Mg alloys, the porous structure of the MAO coating is usually harmful to their corrosion resistance. Thus, to further improve the corrosion resistance of MAO coating on the surface of degradable ZK60 alloy, potassium fluorozirconate (K2ZrF6) treatment as a post-processing method was employed on the MAO coating. The effects of the concentration of K2ZrF6 on the microstructure and corrosion resistance of the MAO/K2ZrF6 composite coating were investigated. The results showed that a triple layered composite coating was formed from the outside to the inside, and of the sequence: K2ZrF6 layer, MAO layer and then MgF2 layer. The corrosion resistance of the MAO coating was significantly improved obviously after the K2ZrF6 treatment, as opposed to the lowest corrosion rate exhibited by the composite coating when the concentration of K2ZrF6 was 30 g/L. Meanwhile, as the concentration of K2ZrF6 was further increased, the deposition of K2ZrF6 coating was not uniform due to the formation of large crystalline particles. In addition, the cell relative growth rate (RGR) of the MAO/K2ZrF6 coated samples exceeded 90%, showing good cytocompatibility.