PTCR陶瓷化学镀镍电极溶液中镍离子型体分布和络合剂的作用

Speciation in electroless nickel solutions for BaTiO_3 based PTCR ceramics and the roles of complexing agents

通过热力学平衡的方法 ,研究 Ba Ti O3系陶瓷 PTCR元件进行化学沉积金属镍电极时常用的醋酸盐 -镍离子、甘氨酸 -镍离子和柠檬酸盐 -镍离子体系化学镀镍溶液中各种型体镍离子的分布。实验表明 ,加入络合剂会影响化学镀镍的速度 ,醋酸盐会使化学沉积速度升高 ,而甘氨酸和柠檬酸盐会使化学镀镍速度明显下降 ,这可能和化学镀镍过程的混合电位、络合剂的空间位阻及镍 -配位原子间的结合力等因素有关。通过本文的研究表明 ,选择合适的络合剂对于化学镀镍的稳定操作 。

In Chinese Based on thermodynamic speciation calculations, the roles of complexing agents in electroless nickel solutions for ohmic electrodes of BaTiO 3 based PTCR ceramics are investigated Electroless nickel solutions with acetate or citrate or glycine would decrease the concentration of free nickel All solutions exhibit a fraction of free nickel, which decreases with the increasing formation constant of the nickel ligand species The plating rate and solution stability are dependent upon the structure of nickel in solution Higher deposition rates are observed in nickel solutions with fewer chelated sites in the nickel complex (8 refs )