Environmental Technique and Property of Coloring Stainless Steel

Through improving the traditional coloring technology,a new environmental coloring technology at low temperature and without chrome for stainless steel was developed.The technology used a coloring solution containing ferrous ammonium sulfate as the main salt and a proper amount of additive.Interferential films with blue,gold,red,green and brown colors were successfully produced on stainless steel by appropriate control of the electrolytic time.The composition and morphology of colored films were exammed by scan probe microscopy (SPM) and X-ray photoelectron spectroscopy (XPS),and their corrosion resistance was also studied by potentiodynamic polarization.The main elements of colored films are Fe,O and so on.The films are colorful.The corrosion resistance is good,and the technology temperature is low.