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 CeO
2 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 CeO
2 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 CeO
2 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.