交流界面インピーダンス法によるワット浴からのニッケルめっきに及ぼすかく拌と添加剤の影響に関する研究

概要

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The effects of agitation and additives on nickel electrodeposition from Watts bath were investigated by interfacial AC impedance technique. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were also used to investigate the crystal orientation and the morphology. Without agitation, there was a single capacitive loop on the high-frequency side, and a single inductive loop and a single capacitive loop on the low-frequency side of the Cole-Cole plot. The low-frequency capacitive loop became larger relative to the other loops at higher current densities, but disappeared with agitation. This is attributed to the adsorption-desorption reaction of molecular hydrogen. When saccharin and 2-butyne-1, 4-diol were added together to the solution, finer crystals were obtained. The crystals had a (111) preferred orientation, which became even higher when the bath was agitated. The nickel deposits had a layered structure due to the adsorption-desorption of hydrogen. The thickness of layer spacings decreased at higher current densities, but increased with agitation.