Abstract: A method of treating the surface of each of a plurality of objects comprising washing the objects; positioning the objects on each of a plurality of structural members; depositing a thin coating on each object; drying the thin coatings; placing the objects and the structural members on a tray in a heating chamber wherein an electric heating unit is disposed in the heating chamber for forming a first metal coat on the thin coating of each object and a second metal coat on each structural member by evaporation; placing the objects and the structural members in a tank filled with electro-coating solution such that after conducting the electro-coating solution positive or negative ions of the electro-coating solution are dissociated and move to the surfaces of the objects for depositing an outer layer thereon; and removing the objects from each structural member.