Preparation and characterization of Fe/Cr doped SiO2 passive film on SUS304 stainless steels

摘要

A Fe/Cr-doped SiO2 thin film which can improve the anti-corrosion character of materials was prepared on SUS304 stainless steels substrates by modified hydrothermal method. The composite film was characterized by scanning electronic micrographs (SEM), X-ray diffraction (XRD)and Electron probe x-ray micro analyzer (EPMA). Results show that the composite film consisted by two parts: metal oxide generated in corrosion process and reticular formation of silica deposited from solution. The anticorrosion character were measured by weight loss and electrochemical potentiodynamic polarization and suggested that the film can improve effectively the corrosion resistance of stainless steels.