The γ-glycidoxy-propyl tri-methoxy silane-based composite film with cerium and chromium ions was prepared on the surface of cold rolled steel(CRS) using the immersion technique in this paper.The corrosion resistance of the composite silane film was studied in 3.50% NaCl solution by electrochemistry method.The change in the shape of the composite silane film before and after corrosion testing was researched by employing the scanning electron microscope.The result indicates that the silane solution with cerium and chromium ions

which reacts at 50℃ with the pH value 4 for 8h

has the best hydrolyzation effect.Furthermore

the corrosion current density of the CRS with composite silane films decreases to 1.584×10-7 A·cm-2 in 3.50% NaCl solution，and a positive shift for the corrosion potential can be observed.Test result indicates that the shape of the composite silane film with cerium and chromium ions on the CRS remains nearly unchanged after corrosion

and the corrosion resistance is apparently superior to the CRS with pure silane film.