NONCYANIDE SILVER PLATING SOLUTION USING HYDANTOIN AND HYDANTOIN DERIVATIVES

摘要

We studied silver-hydantoin noncyanide silver plating solution to determine the effect of potassium chloride, potassium sulfite, and potassium thiosulfate on deposit appearance using SEM imaging, brightness, and X-ray diffraction. We also studied the effects of hydantoin ,1-methylhydantoin ,and 5,5-dimethylhydantoin on limiting current density using a potential-current curve. Adding potassium chloride yielded a white, homogenized rock-like appearace. Potassium sulfite and potassium thiosulfate yielded a semibright apearance. Hydantoin gave higher limiting current density than 5,5-dimethylhydantoin when used as a silver complex. If the plating solution used hydantoin alone, the solution precipitated easily. Mixing 1-mthylhydantoin with hydantoin prevented precipitation. Soluble silbver anode can also be applied to this bath.