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<p>In order to enhance the service life of the oil tubes, FeCoNiCrMox coatings were fabricated on the inner walls of 316 tubes by laser cladding. The effects of Mo content on the phase structure, microstructure, tribological properties and electrochemical corrosion behavior of the samples were systematically investigated. It was shown that the phase of the coating was transformed from FCC (x = 0, 0.2) to FCC + <i>σ</i> (x = 0.5, 1). With the increase of Mo content, the coating was strengthened by solid solution strengthening, grain refinement and second-phase strengthening, resulting in improved hardness (Mo<sub>max1.0</sub> = 415.5 HV<sub>0.3</sub>) and wear resistance. In the electrolyte, increasing Mo content caused the corrosion potential of the coating to shift positively and the corrosion current density Icorr to decrease, with the minimum value of Icorr<sub>Mo0.2</sub> = 1.265 × 10<sup>−6</sup>A·cm<sup>−2</sup>, thus enhancing the corrosion resistance. However, when the Mo content was excessively high, the <i>σ</i> phase precipitated, which induced electrochemical reactions in the coating and thereby degraded its corrosion resistance.</p>

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Microstructure and Properties of FeCoNiCrMox High-Entropy Alloy Coatings Prepared by Internal Laser Cladding on 316 Steel Tubes

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Liwei Du,
  • Xuedao Shu,
  • Wen Liu,
  • Xiang Yan

摘要

In order to enhance the service life of the oil tubes, FeCoNiCrMox coatings were fabricated on the inner walls of 316 tubes by laser cladding. The effects of Mo content on the phase structure, microstructure, tribological properties and electrochemical corrosion behavior of the samples were systematically investigated. It was shown that the phase of the coating was transformed from FCC (x = 0, 0.2) to FCC + σ (x = 0.5, 1). With the increase of Mo content, the coating was strengthened by solid solution strengthening, grain refinement and second-phase strengthening, resulting in improved hardness (Momax1.0 = 415.5 HV0.3) and wear resistance. In the electrolyte, increasing Mo content caused the corrosion potential of the coating to shift positively and the corrosion current density Icorr to decrease, with the minimum value of IcorrMo0.2 = 1.265 × 10−6A·cm−2, thus enhancing the corrosion resistance. However, when the Mo content was excessively high, the σ phase precipitated, which induced electrochemical reactions in the coating and thereby degraded its corrosion resistance.