镍-纳米二氧化钛复合镀层的制备及性能

Preparation and properties of nickel-titania nanocomposite coating

以多孔泡沫镍为基体,通过在瓦特镀镍液中复合电沉积,得到Ni-TiO2复合镀层。研究了阴极电流密度、pH、时间、镀液中纳米TiO2质量浓度及分散剂种类对Ni-TiO2复合镀层的TiO2含量、表面形貌及光催化性能的影响。通过正交试验得到最佳工艺条件为:TiO2质量浓度10g/L,pH=4.0,阴极电流密度30mA/cm2,施镀时间30min,以1g/L十二烷基苯磺酸钠作分散剂。最佳工艺条件下获得的Ni-TiO2复合镀层与泡沫镍基体结合紧密,光催化活性良好。纳米TiO2在镀层中均匀分布,TiO2在镀层中的质量分数和原子分数分别为9.97%和14.31%。

A Ni-TiO2 composite coating was obtained by electroplating from a Watts bath on the substrate of foamed nickel. The effects of cathodic current density, pH, time, TiO2 mass concentration in bath and type of dispersant on the TiO2 content, surface morphology, and photocatalytic property of the Ni-TiO2 composite coating were studied. The optimal process parameters were obtained by orthogonal test as follows： TiO2 10 g/L, pH 4.0, current density 30 mA/cm2, time 30 rain, and sodium dodecyl benzene sulfonate 1 g/L as dispersant. Under the given conditions, the Ni-TiO2 composite coating obtained has good adhesion to nickel foam and high photocatalytic activity. TiO2 particles are dispersed uniformly in the composite coating with mass and atomic fractions of 9.97% and 14.31%, respectively.