Process Galvanized coating treatment where the workpiece through the conversion coating reacts with the added solution and so that a layer of iron is formed on the workpiece surface.
Process Polishing process where a roller is pressed against the workpiece surface for pressing down unevenness and thus create a smoother surface which is additionally work-hardened.
Process Polishing process in which the workpieces are placed in a liquid containing detergent and small ferromagnetic needles which is rotated by externally applied magnetic fields.