Effects of Boron Carbide Particle Content on Corrosion Resistance and Wear Resistance of Ni-B/B4C Composite Coatings

Abstract

In this study, Ni-B/B4C composite coatings were prepared by adding different concentrations of B4C particles, and the effect of B4C particle addition on the corrosion resistance and wear resistance of composite coatings was study. The results show that the microhardness value of the composite coating does not increase with the addition content of B4C particles. The highest microhardness value of the composite coatings occurred at the addition concentration of B4C particle is 2 g/L, and its microhardness value is 983.7 Hv. This phenomenon can be attributed to the fact that the composite coating has the highest B4C particle coverage (15.2 Vol.%) at this B4C concentration. The results of corrosion resistance and wear resistance test show that the composite coatings prepared with B4C particles at a concentration of 2 g/L has the best corrosion resistance and wear resistance, and its icorr value and wear rate are 8.78×10-7 A/cm2 and 2.7×10-4 mg/N·m, respectively. Therefore, when more B4C particles are co-deposited in the composite coatings, the corrosion resistance and wear resistance of the composite coatings can be effectively improved at the same time.