Preparation of Ni-Cu composite coatings with excellent tribological property and corrosion resistance by doping OH-BN(h)-PA-Zn-DCD hybrid

In this study, a novel Ni-Cu/OH-BN(h)-PA-Zn-DCD composite coatings with excellent wear resistance and corrosion resistance was developed, which may be used in the field of seawater corrosion. By the self-assembling of phytic acid, Zn2+ and dicyandiamide to grow PA-Zn-DCD structure onto the surface of hydroxylated BN(h) nanosheets, obtained a hybrid denoted as OH-BN(h)-PA-Zn-DCD, which was doped into Ni-Cu coating by pulse electrodeposition. The results show that OH-BN(h) and OH-BN(h)-PA-Zn-DCD hybrids affect the surface morphology, roughness, microcrystals size and thickness of the composite coatings. Simultaneously, compared with NC coating and NC/HB-1.5 coating, NC/BP-1.5 coating has the highest microhardness (559.26 Hv), the lowest friction coefficient (0.172), and the best corrosion resistance (icorr is 3.551 × 10−8 A·cm−2, Rct is 1.098 × 106 Ω·cm2). In addition, the EIS results of the immersed specimens showed that the NC/BP-1.5 composite coating still has good protective ability after soaking for 15 days in simulated seawater medium (Rct is 7.434 × 106 Ω·cm2).