非シアン銀めっき浴における電析物の表面形態および構造に対する亜鉛イオン添加の影響

抄録

When zinc ions are added in noncyanide silver electroplating, temperature obviously affects the surface appearance, structure, and the amount of zinc electrodeposited, while the effects of pH and additives were less. Adding sodium thiosulfate makes the grain size of electrodeposits fine, causing a low Miller index plane and orientation toward the (111) plane. Under the condition of a high sodium thiosulfate concentration, the orientation is especially strong. Also, in higher-current-density silver-zinc alloying, the orientation is changed toward (111) of the Ag-Zn alloy with an increase in zinc ions. At a limiting current density, zinc content is comparatively enlarged. At higher concentrations of zinc ions in the solution, the zinc content in the deposited film increases.