论文部分内容阅读
本文用电势法研究了水玻璃锌酸盐镀液中硅酸粒子的存在形式、锌与硅的成络反应以及混合配体络离子的组成,并估算了成络反应的平衡常数和混合配体络离子的稳定常数。实验结果表明:锌与硅的成络反应是复杂的,在研究的镀液中硅主要以单核络离子SiO_2(OH)_2~(2-)的形式存在,它与Zn(Ⅱ)形成混合配体络合物,例如有[Zn(SiO_2(OH)_2)_2(OH)_2]~(4-)的形式。该成络反应的平衡常数K_c(30℃时)等于4.7×10~2,混合配体络离子的稳定常数K稳等于1.5×10~(18)。
In this paper, the existence of silicate particles, the formation of silica particles and the complexation of zinc and silicon, and the complexation of the complex ligands were studied by potentiometric method. The equilibrium constants and mixed ligands Stability constant of complex ions. The experimental results show that the complex reaction between zinc and silicon is complex. In the studied bath, the silicon exists mainly in the form of mononuclear ion SiO_2 (OH) _2 ~ (2-), which is mixed with Zn (Ⅱ) Ligand complexes are, for example, in the form of [Zn (SiO 2 (OH) _2) _2 (OH) _2] ~ (4-) The equilibrium constant of the complex reaction K_c (at 30 ℃) is equal to 4.7 × 10 ~ 2, and the stability constant of mixed ligand complex ions is equal to 1.5 × 10 ~ (18).