Influence of the bath pH value on the microstructure and properties of a novel electrodeposited Ni-W-Ti3C2TX composite coating

According to the previous research, the hardness of Ni-W-Ti3C2TX composite coating is 24.3% higher than that of Ni-W alloy coating without adding Ti3C2TX. Meanwhile, the wear resistance and corrosion resistance of the composite coating are significantly better than that of Ni-W coating. It is known that the electrodeposition process parameters have a great influence on the performance. The Ni-W-Ti3C2TX composite coating was prepared by the direct current deposition method. The influence of bath pH on the morphology, composition, mechanical properties, corrosion resistance and friction resistance of the coating was systematically studied. The results show that the surface morphology of the coating is improved with the increase of pH value. The content of W in the coating decreases from 44.95 wt.% to 12.66 wt.%, and the grain size decreases from 77.1 nm to 8.9 nm. The hardness of the coating increases first and then decreases with the increase of pH under the joint action of fine grain strengthening and solution strengthening. When pH is 9, the corrosion resistance and tribological properties are the best, and the corrosion current density and wear rate are 1.782 x 10(-3) mA center dot cm(-2) and 0.865 x 10(-6) mm(3)center dot n(-1)center dot m(-1), respectively. A suitable pH value provides excellent surface quality, appropriate grain size and good hardness for the composite coating to show excellent corrosion resistance and friction resistance.

Automated summary

Based on previous research, the addition of Ti3C2TX in Ni-W-Ti3C2TX composite coating improves its hardness by 24.3% compared to Ni-W alloy coating without Ti3C2TX. Additionally, the wear resistance and corrosion resistance of the composite coating are significantly enhanced. The study investigates the influence of bath pH on the coating's morphology, composition, mechanical properties, corrosion resistance, and friction resistance. It is found that the surface morphology of the coating improves as the pH value increases. The suitable pH value of 9 provides the best corrosion resistance and tribological properties for the composite coating.