电镀Ni-P-Ti3C2Tx合金镀层的制备以及性能研究

目的提高Ni-P合金镀层的硬度及腐蚀防护性能。方法块体Ti3AlC2颗粒经过氢氟酸的刻蚀作用得到二维层状结构的Ti_3C_2T_x材料,并通过电沉积技术将其掺杂到Ni-P合金镀层中,从而制备出Ni-P-Ti_3C_2T_x复合合金镀层,研究复合合金镀层的成分、表面形貌、表面接触角和硬度,并结合动电位极化曲线以及尼奎斯特阻抗图,分析Ti_3C_2T_x颗粒掺杂对Ni-P合金镀层性能的影响。结果通过深入研究复合合金镀层的性能,发现随着Ti_3C_2T_x颗粒掺杂量的增加,Ni-P-Ti_3C_2T_x合金镀层的表面粗糙程度不断增加,这可能是由于导电的Ti_3C_2T_x颗粒使得合金镀层的树枝状结晶增加,而且合金镀层的表面接触角增大,对于提高合金镀层的腐蚀防护性能有很大的促进作用。由于Ti_3C_2T_x颗粒的掺杂,合金镀层的显微硬度得到了提高,这主要是依靠于弥散增韧的作用以及有限的晶界。Ni-P-Ti_3C_2T_x合金镀层的腐蚀防护性能随着Ti_3C_2T_x颗粒掺杂量的增加,出现了先增加后减小的趋势。结论 Ti_3C_2T_x颗粒的掺杂对提高Ni-P合金镀层的硬度以及腐蚀防护性能有一定的作用。

Preparation and Properties of Ni-P-Ti3C2Tx Electrodeposited Plating

The work aims to improve the microhardness and corrosion protection of Ni-P coatings. The block Ti3AlC2 particles were disposed with 40% hydrofluoric acid to obtain Ti3C2Tx particles with the two-dimensional layered structure and then Ti3C2Tx particles were added into electroplating bath to prepare Ni-P-Ti3C2Tx composite coatings by electrodeposited technology. The composition, surface morphology, surface contact angle and microhardness of Ni-P-Ti3C2Tx composite coatings were studied, and the effect of Ti3C2Tx particles on the properties of Ni-P coatings was analyzed by combining the dynamic potential polarization curves and Nyquist impedance diagrams. Through in-depth analysis of the performance of Ni-P-Ti3C2Tx composite coatings, the surface roughness of Ni-P-Ti3C2Tx composite coatings increased unceasingly with the increasing doped amount of Ti3C2Tx particles. This was because that the conductive Ti3C2Tx particles increased the dendritic crystal and the surface contact angle of Ni-P-Ti3C2Tx composite coatings grew, thus playing a great role in improving the corrosion protection performance of Ni-P-Ti3C2Tx composite coatings. Moreover, the microhardness of Ni-P-Ti3C2Tx composite coatings improved with the doped Ti3C2Tx particles, mainly depending on the effect of dispersion toughening and limited grain boundaries. The corrosion protection performance of Ni-P-Ti3C2Tx composite coatings increased at first and then decreased with the increasing doped amount of Ti3C2Tx particles. Doped Ti3C2Tx particles can improve the microhardness and corrosion protection of Ni-P composite coatings.