The electro‐deposition of paint

In an aqueous solution, salts of electrolyte separate into ions. This separation needs no external source of electrical potential, so no electrical energy is expended. When two electrodes are immersed in such a solution and connected to a D.C. potential, a potential gradient exists in the solution between them. Under its influence ions in the vicinity are discharged and there is movement of cations and anions in the bulk of the electrolyte, with the cations moving and getting discharged at the cathode and the anions likewise at the anode. This is now a well‐accepted fact which has been exploited industrially in electrolysis process, electrophoresis, metal electroplating, etc.