Ni-TiO_2纳米复合电镀层的制备与性能研究

Preparation and Performance Research on Ni-TiO_2 nm Composite Electroplate Coating

用电镀的方法制备出了Ni-TiO2纳米复合电镀层,讨论了表面活性剂、阴极电流密度、搅拌速率等对复合镀层硬度的影响,并分析了纳米TiO2的加入对复合镀层硬度、耐蚀性的影响情况.结果表明,与纯镍镀层相比,Ni-纳米TiO2复合电镀层的硬度可提高90~190HV;添加阳离子表面活性剂分散纳米TiO2所得复合镀层硬度最高,说明阳离子表面活性剂有利于纳米TiO2-Ni复合电沉积.浸泡试验表明,在硝酸溶液中复合镀层的腐蚀速率高于纯镍镀层的腐蚀速率,但远低于未镀覆钢板的腐蚀速率;极化曲线表明,与纯镍镀层相比,复合镀层的自腐蚀电位没有显著提高.说明在复合镀层中添加纳米TiO2不能改善其耐蚀性.

Ni-TiO2 nanometer composite electroplate coating is prepared by the means of electroplating. The effect of surface active agent, current density of negative electrode and stirring rate to the hardness of composite electroplate coating is discussed. And the effect of adding nm TiO2 to the hardness and erosion resistance of composite electroplate coating is analyzed. The results show that, compared with pure nickel coating,the hardness of Ni-TiO2 nm composite electroplate coating can be improved by 90-190Hv; the hardness of composite electroplate coating resolved by adding cation surface active agent to separate nm TiO2 is the most hard,which indicates cation surface active agent is of benefit to TiO2-Ni nm composite electroplate position. The soaking experiments show that the corrosion rate of composite electroplate coating in nitric acid solution is higher than that of pure nickel coating, but much lower than the corrosion rate of nplating steel sheet. The polarization curve shows that, compared with pure nickel coating, the self-corrosion potential of composite electroplate coating has not been improved obviously,which indicates that adding nm TiO2 composite electroplate coating can not improve its erosion resistance.