Effect of Two-step Electrochemical Composite Deposition on the Coating Structure and Friction Bearing Capacity of Ni-MoS2 Composite Coatings
CHENG Qian1, YAO Zhengjun1,2, ZHANG Fan1, NIU Yongkang1
1 College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 2 Key Laboratory of Materials Preparation and Protection for Harsh Environment, Ministry of Industry and Information Technology, Nanjing 211106, China
Abstract: Due to the high porosity of Ni-MoS2 composite coatings caused by the preferential deposition of MoS2 particles, the two-step electrochemical composite deposition was employed to repair the deposition deficiency of Ni-MoS2 coatings. The results demonstrated that the second nickel plating transforms the dendrite feature of Ni-MoS2 coatings into the nodular characteristics of Ni-MoS2+Ni coatings. Contrary to the loose Ni-MoS2 coatings, the densification of Ni-MoS2+Ni coatings got increased, with fewer deposition defects observed. The microhardness of Ni-MoS2+Ni coatings (282.0HV0.1) was approximately twice as much as that of Ni-MoS2 coatings (130.7HV0.1). Abundant nickel element was introduced to the loose MoS2+Ni coatings after the second nickel deposition, for the repairment of its deposition defects and the reinforcement of its porous structure. Therefore, Ni-MoS2+Ni coatings could preserve excellent antifriction and carry greater wear load for a longer time.
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2020, Vol. 34 
