Study on the Preparation and Performance of NiW Nanocrystalline Coatings Incorporated with Carbon Nanoparticles
摘要
In this study, NiW coatings incorporated with carbon nanoparticles were prepared on Q235B carbon steel substrates via electrodeposition. By varying the concentration of carbon nanoparticles in the plating bath from 0 to 15 g/L, the effects on coating thickness, surface roughness, morphology, chemical composition, and corrosion resistance were systematically investigated. Cyclic voltammetry curve revealed that carbon nanoparticles enhanced cathodic current by increasing the electroactive surface area and promoting nucleation. Optimal incorporation of 10 g/L carbon nanoparticles yielded coatings with the greatest thickness (23.7 μm) and lowest surface roughness (0.416 μm), indicating improved microstructural uniformity. The surface of the NiW/C composite coating is densely covered with closely packed finer nodules with nanosize. As the concentration of carbon nanoparticles increases to 5, 10, and 15 g/L, the carbon content in the coating gradually increases from 4.7 to 7.5 wt.% and 12.3 wt.%, respectively. The NiW/C composite coating fabricated from the plating solution with 10 g/L carbon nanoparticles exhibited the most positive corrosion potential (− 0.49 V) and the lowest corrosion current density (9.7 μA/cm2). However, excessive carbon nanoparticles (15 g/L) led to agglomeration, increased surface roughness, and diminished corrosion performance. These findings highlight that controlled incorporation of carbon nanoparticles effectively changes the structural and protective properties of NiW coatings, offering a promising strategy for developing advanced corrosion-resistant coatings for harsh environments.