添加剂的结构对镍电结晶的影响

采用循环伏安法研究了糖精、丁炔二醇和香豆素对镍电结晶过程的影响。无论Wstts 液中含不含上述添加剂,镍的电结晶均同于“不可逆和复杂的”过程,分别由不同的三维成核和晶核生长的动力学所引起。根据 Bosco 和Rangarajan 提出的成核/生长模式进行拟合,发现在不含、只含香豆素和同时含上述三种添加剂的 Watts 液中,电结晶遵循连续成核和生长的机理,而在含糖精,丁炔二醇或两者兼有的镀液中,则按瞬时成核/生长方式进行。还就三种添加剂的结构特征和吸附能力讨论了它们对成核和生长规律的影响。

Effects of the Structure of Additives on the Electrocrystallization of Nickel

The effects of the additives (saccharin,1.4-butynediol and coumarineiectrocrystallization of nickel from Watts electrolyte have been studied using cyclic voltam'metry. The suits show that the electrocrystallization belongs to "irreversible and complex" process, no matter whet the electrolytes contain additives mentioned above. However the process is discriminative in the kinet three-dimensional nucleation and crystal growth. According to the nucleation-growth modci oroposed by Bosco and Rangarajan,it has been found that, in the electrolytes without additives, or in those containing coumarin only or ail the three additives, the electrocrystallization of nickel follows the progressive 3-D nucleation and growth mechanism, whereas the instantaneous 3-D nucleation and growth mechanism in the electrolytes with saccharin and/or butynediol. The effects of the three additives on the nucleation and growth are discussed in terms of their molecular structures and adsorbabihtes