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<p>To address the limited corrosion and wear resistance of LZ91 magnesium–lithium alloy, TiC-reinforced ceramic composite coatings were fabricated using micro-arc oxidation (MAO) in a silicate-aluminate electrolyte containing 0–15&#xa0;g/L TiC particles. Characterization results revealed that TiC was successfully integrated into the coating matrix as an inert phase, coexisting with MgO, Mg<sub>2</sub>SiO<sub>4</sub>, and MgAl<sub>2</sub>O<sub>4</sub>. The addition of TiC acted as an effective pore-filling agent, significantly minimizing micro-cracks and pores, resulting in a denser structure and a thicker coating. Electrochemical tests demonstrated that the corrosion resistance improved progressively with increasing TiC content, with the coating prepared using 15&#xa0;g/L TiC (M15) showing the highest performance, achieving a corrosion current density of 2.63 × 10<sup>−7</sup>·A·cm<sup>−2</sup>. This value represents a reduction of three orders of magnitude compared to the bare substrate and one order of magnitude compared to the particle-free MAO coating. Furthermore, the incorporation of TiC particles increased the microhardness of the coating from 197&#xa0;HV (M0) to 361&#xa0;HV (M15), and the specific wear rate decreased to 1.159 × 10<sup>−3</sup>&#xa0;mm<sup>3</sup>/(N·m). The M15 coating also exhibited the optimal interfacial bonding strength, ultimately resulting in enhanced overall wear resistance for the composite system.</p>

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Enhancing corrosion and wear resistance of LZ91 alloy via TiC-reinforced micro-arc oxidation composite coatings

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Jiaxiang Zhao,
  • Xiaochen Zhang,
  • Xu Jiang,
  • Yongsheng Chen,
  • Ruizhi Wu,
  • Xiaochun Ma,
  • Guixiang Wang,
  • Jie Zhou,
  • Boris Krit,
  • Sergey Betsofen

摘要

To address the limited corrosion and wear resistance of LZ91 magnesium–lithium alloy, TiC-reinforced ceramic composite coatings were fabricated using micro-arc oxidation (MAO) in a silicate-aluminate electrolyte containing 0–15 g/L TiC particles. Characterization results revealed that TiC was successfully integrated into the coating matrix as an inert phase, coexisting with MgO, Mg2SiO4, and MgAl2O4. The addition of TiC acted as an effective pore-filling agent, significantly minimizing micro-cracks and pores, resulting in a denser structure and a thicker coating. Electrochemical tests demonstrated that the corrosion resistance improved progressively with increasing TiC content, with the coating prepared using 15 g/L TiC (M15) showing the highest performance, achieving a corrosion current density of 2.63 × 10−7·A·cm−2. This value represents a reduction of three orders of magnitude compared to the bare substrate and one order of magnitude compared to the particle-free MAO coating. Furthermore, the incorporation of TiC particles increased the microhardness of the coating from 197 HV (M0) to 361 HV (M15), and the specific wear rate decreased to 1.159 × 10−3 mm3/(N·m). The M15 coating also exhibited the optimal interfacial bonding strength, ultimately resulting in enhanced overall wear resistance for the composite system.