电沉积参数对镍-纳米金刚石复合镀层性能的影响

Influence of Electrodeposition Parameters on Properties of Ni-Nanometer Diamond Composite Coating

目前有关纳米复合镀层电沉积的研究还不够深入、系统。以瓦特镀镍液为基础,在Q235A钢基体上制备镍-纳米金刚石复合镀层,研究了纳米金刚石浓度、搅拌速度对镍-纳米金刚石复合镀层性能的影响规律。在测试纳米金刚石复合镀液中镍的还原行为时发现,随着纳米金刚石浓度的升高,镍离子的极化程度呈现先升高后下降的趋势,镀液中纳米金刚石浓度为8.0 g/L时极化程度最大,同等条件下直流电沉积制备的复合镀层硬度、弹性模量分别为4.66 GPa和195.2 GPa,而双脉冲电沉积制备的镀层硬度和弹性模量分别达到5.23 GPa和197.4 GPa。

Nickel-nanometer diamond composite coating was synthesized on the Q235A substrate in the traditional Watt nickel plating bath by direct current electrodeposition and double pulse electrodeposition. The influence law of concentration of nanodiamond and deposition stirring rate on the performance of nickel-nanometer diamond composite coating was studied. Results showed that the degree of polarization in the electrode-position process rose firstly and then decreased with the increase of diamond concentration, and the maximum polarization degree was obtained with 8 g/L of diamond concentration. Under the above optimal condition, the hardness and elastic modulus of the composite coatings prepared by direct current deposition were 4.66 GPa and 195.2 GPa, while those by double pulse electrodeposition were 5.23 GPa and 197.4 GPa.