The influence of SiO2 and Al2O3 nanoparticles on corrosion resistance enhancement of Ni–P on magnesium

Abstract

In this study, the influence of adding SiO2 and Al2O3 to Ni–P coated on magnesium substrate and the related corrosion resistance behavior were evaluated. The surface morphology of Ni–P–SiO2–Al2O3 composite coating was investigated by field emission scanning electron microscopy (FESEM). The amount of Al2O3 and SiO2 in the coating was measured by energy dispersive analysis of X-ray (EDX) and the corrosion behavior of coating was monitored by electrochemical impedance spectroscopy (EIS) and polarization techniques, showing the corrosion resistance of Ni–P–SiO2–Al2O3 increases compare to Ni–P–SiO2 and Ni–P–Al2O3. Furthermore, the microhardness of the coating was examined and the final hardness of Ni–P–SiO2–Al2O3 reached 461 VH.