A Comparative Study of the Microstructure, Mechanical Properties and Corrosion Resistance of Ni- or Fe- Based Composite Coatings by Laser Cladding

  • M. Q. Wan
  • J. Shi
  • L. Lei
  • Z. Y. Cui
  • H. L. Wang
  • X. Wang


Ni- and Fe-based composite coatings were laser cladded on 40Cr steel to improve the surface mechanical property and corrosion resistance, respectively. The microstructure and phase composition were analyzed by x-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) equipped with an energy-dispersive spectrometer (EDS). The micro-hardness, tribological properties and electrochemical corrosion behavior of the coatings were evaluated. The results show that the thickness of both the coatings is around 0.7 mm, the Ni-based coating is mainly composed of γ-(Ni, Fe), FeNi3, Ni31Si12, Ni3B, CrB and Cr7C3, and the Fe-based coating is mainly composed of austenite and (Fe, Cr)7C3. Micro-hardness of the Ni-based composite coating is about 960 HV0.3, much higher than that of Fe-based coating (357.4 HV0.3) and the 40Cr substrate (251 HV0.3). Meanwhile, the Ni-based composite coating possesses better wear resistance than the Fe-based coating validated by the worn appearance and the wear loss. Electrochemical results suggested that Ni-based coating exhibited better corrosion resistance than the Fe-based coating. The 40Cr substrate could be well protected by the Ni-based coating.


corrosion behavior laser cladding Ni- and Fe-based composite coatings tribological properties 



This work was supported by the National Natural Science Foundation of China (No. 41406092), Qingdao Postdoctoral Science Foundation (No. 82214354), Qingdao Science and Technology Foundation for Youths (No. 14-2-4-113-jch), and Fundamental Research Funds for the Central Universities (No. 201413057).


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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Institute of Materials Science and EngineeringOcean University of ChinaQingdaoChina

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