论文部分内容阅读
应用循环伏安法和电位阶跃法研究了Ｎｉ－Ｗ合金电沉积特点．结果表明，在以柠檬酸铵为络合剂的镀液中，沉积层的Ｗ含量随电流密度的增大而增加但电流效率变化不大，当电流密度超过１５Ａ／ｄｍ２后，镀层的Ｗ含量不再发生明显的变化而电流效率却明显降低．循环伏安实验结果表明，当镀液中有Ｎｉ２＋存在时，ＷＯ２－４才能被还原到以Ｎｉ－Ｗ合金形式存在的Ｗ金属态，且其沉积电位比ＷＯ２－４（沉积为钨蓝氧化物）和Ｎｉ２＋单独沉积时的电位更正．根据电位阶跃的ｉ～ｔ曲线分析得知，在玻碳电极上Ｎｉ－Ｗ合金电结晶过程遵从扩散控制瞬时成核三维成长模式进行，且随着过电位的增加，电极表面上晶核数增多．
The characteristics of electrodeposition of Ni-W alloy were studied by cyclic voltammetry and potential step method. The results showed that the W content of the deposited layer increased with the increase of the current density, but the current efficiency did not change much. When the current density exceeded 15 A / dm2, the W content of the coating No significant changes occur and the current efficiency is significantly reduced. Cyclic voltammetry results show that when Ni2 + is present in the bath, WO2-4 can be reduced to the W metal state in the form of Ni-W alloy and its deposition potential is lower than that of WO2-4 (deposited as tungsten blue oxide ) And potential correction when Ni2 + was deposited alone. According to the i ~ t curve analysis of potential step, it is found that the electrocrystallization of Ni-W alloy on glassy carbon electrode follows diffusion-controlled three-dimensional growth mode of instantaneous nucleation. With the increase of overpotential, the number of nuclei increase.