Applications of constant current:

Nitrate ions have long been used in the constant current deposition of copper and lead, while in copper is deposited at the cathode and lead is deposited as lead dioxide at the anode.  The Nitrate ions aid within the quantitative deposition of cupric ions at the cathode and avoid the formation of metallic lead at the cathode. Table 5.1 described the classical applications of constant current electrolysis.

Table: Typical applications of constant current electrolysis