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添加CeO2对激光熔覆Ni基/WC复合涂层的影响

Effect of CeO2 addition on laser cladding Ni-based/WC composite coatings

  • 摘要: 为了提高Q235钢材在海水中的耐腐蚀性能,扩大其应用场合,使其能够服役于富含Cl离子的海洋环境,采用激光熔覆技术,在Q235钢表面制备出添加不同质量分数CeO2改性的Ni基/WC复合熔覆层,并利用扫描电镜、能谱仪和电化学工作站等仪器对熔覆层的组织与性能进行了测试。结果表明,适量CeO2的加入可以促进晶粒细化与组织的均匀分布,提高熔覆层在NaCl溶液(质量分数为3.5%)中的耐腐蚀性能;当添加的CeO2质量分数达到1%时,熔覆层具有最高的平均硬度与最好的耐海水腐蚀性能;过高的CeO2含量则会加剧电偶腐蚀效应,降低其耐腐蚀性能。该研究为后续在Q235钢材表面制备耐腐蚀的激光熔覆合金涂层、改善合金材料表面性能提供了理论参考依据。

     

    Abstract: In order to improve the corrosion resistance of Q235 steel in seawater and to prolong its service life in marine environment, Ni-based/WC composite cladding layer with different mass fraction CeO2 was prepared on Q235 steel by laser cladding technology. The microstructure, microhardness, and electrochemical corrosion properties in NaCl solution (mass fraction of 3.5%) of the coatings were characterized by using scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, microhardness tester, and electrochemical workstation, respectively. The results show that the addition of an appropriate amount of CeO2 promoted grain refinement and a uniform distribution of the microstructure, thereby enhancing the hardness and corrosion resistance of the coatings in NaCl solution. When the mass fraction of CeO2 adds reached 1%, the coating exhibites the highest average hardness and the best resistance to seawater corrosion. This study provides a theoretical reference for subsequent laser cladding preparation of coatings resistant to seawater corrosion.

     

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