Microstructures, corrosion resistance and mechanical properties of Ni-Cu-P-PTFE composite coatings.

The effects of Cu addition on the microstructure, corrosion resistance and mechanical properties of Ni-P-PTFE composite coatings were studied in this paper. The microstructure, corrosion resistance and mechanical properties of the coatings were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical workstation, nano-indenter, and friction wear testing machine, respectively. The results show that Cu addition has great influence on the composition, microstructure, corrosion resistance and mechanical properties of Ni-P-PTFE composite coating. With the increase of Cu2+ concentration in the plating solution, Cu content in the coating first increased and then decreased, while the content of Ni, P, and PTFE first decreased and then increased. With the increase of Cu content in the coating, the corrosion resistance and hardness of Ni-Cu-P-PTFE composite coatings improved, while the friction performance decreased. [ABSTRACT FROM AUTHOR]