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<p>Co–xTiC coatings with different TiC contents were prepared on S355 steel by laser cladding to improve its immersion corrosion and electrochemical properties. The microstructure, immersion corrosion and electrochemical properties of obtained coatings in 3.5% NaCl solution were investigated, and the corrosion model was also discussed in detail. The results show that the porosity of Co–xTiC coatings is decreased with the TiC content, which enhances the coating quality. The corrosion rates of Co–xTiC coatings are decreased with the increase in TiC content, which is attributed to the formation of CoO film by the addition of TiC. Moreover, the polarization resistance and charge transfer resistance of Co–xTiC coatings are increased with the TiC content, showing that the Co–15%TiC coating has the highest corrosion resistance among the three kinds of coatings.</p>

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Laser-Cladded Co–xTiC Coatings: Microstructure, Immersion Corrosion and Electrochemical Properties in 3.5% NaCl Solution

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Guihua Ni,
  • Rui Shi,
  • Dejun Kong

摘要

Co–xTiC coatings with different TiC contents were prepared on S355 steel by laser cladding to improve its immersion corrosion and electrochemical properties. The microstructure, immersion corrosion and electrochemical properties of obtained coatings in 3.5% NaCl solution were investigated, and the corrosion model was also discussed in detail. The results show that the porosity of Co–xTiC coatings is decreased with the TiC content, which enhances the coating quality. The corrosion rates of Co–xTiC coatings are decreased with the increase in TiC content, which is attributed to the formation of CoO film by the addition of TiC. Moreover, the polarization resistance and charge transfer resistance of Co–xTiC coatings are increased with the TiC content, showing that the Co–15%TiC coating has the highest corrosion resistance among the three kinds of coatings.