Electroplating is a technique of depositing a thin film of another metal on the surface of a metal.
(-) electrode is connected to the object to be plated,
(+) Electrode is connected to plating material such as gold, silver, nickel.
Two metals are soaked in a ion solution that have same metal to be plated.
In this case, in the (-) electrode, the ions are reduced and plated, and in the (+) electrode, the metal is oxidized to become an ions.
(+)electrode (oxidation): Ag(s) → Ag+(aq) + e-
(-)electrode (reduction): Ag+(aq) + e- → Ag(s)