Basecoat-free chromatic coating structure on surface of steel work-pieces

The utility model relates to a color coating structure on the steel workpiece surface without applying middle coating, which is characterized in that at least three layers of film are arranged on the steel workpiece surface; wherein, a first layer is a phosphate conversion film; a second layer is an electrophoretic paint film; a fourth layer is a transparent finishing paint layer. The utility model is characterized in that a third layer is a metallic flashing fundamental color paint or true and fundamental color paint layer. The utility model has the advantages of reducing color coating application cost on the steel workpiece, saving energy and meeting the higher requirements of environmental protection regulations with excellent performance.