Plating equipment for surface treatment, namely, plating tanks, plating machines for surface treatment comprised of rinse water tanks, electric pumps, and machines for cooling solutions in plating tanks; plating equipment for passivation of surfaces, namely, plating tanks, plating machines for passivation of surfaces comprised of rinse water tanks, electric pumps, and machines for cooling solutions in plating tanks; plating equipment for metallization of surfaces, namely, plating tanks, plati...