Abstract
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 appearance. 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-methylhydantoin with hydantoin prevented precipitation.
Soluble silver anode can also be applied to this bath.
