Electrodeposition of NiP/SiC Composite Coating on A105 Steel and Its Corrosion Resistance in Simulated Concrete Pore Solution

In the paper, Ni coating, NiP coating and NiP/SiC composite coating were prepared on A105 steel by electrodeposition. The chronoamperometry curves, corrosion resistance, thickness, roughness and surface morphology of different electrodeposited coatings are studied. Nano-SiC particles are positively charged in an aqueous solution, which will migrate to the cathode surface and embed into Ni and NiP alloy coating during electrodeposition to form NiP/SiC composite coating. It is found that the nano-SiC embedded in NiP alloy can increase coating thickness, refine the grains, and greatly reduce the roughness. Compared to Ni coating and NiP coating, the NiP/SiC composite coating possesses the best corrosion resistance with the smallest corrosion current density (7.94 mu A/cm2) and the most positive corrosion potential (-0.417 V).