Technical Abstract: Corrosion is one of the most serious and challenging problems faced worldwide by industry. This research investigates the inhibition of corrosive behavior of SAE1010 steel by bacterial exopolysaccharides. Electrochemical Impedance Spectroscopy was used to evaluate the corrosion inhibition of different polysaccharide thin films cast from an aqueous solution onto steel coupons. There were two different behaviors when films were cast onto the steel. Some polysaccharide films reacted immediately with the metal coupon to form an iron (III) oxide layer (“rust”) during the drying process while others did not. The samples which did not form an initial oxide layer had the most corrosion inhibition and formed an iron (II) passivation layer during testing that persisted after the cells were disassembled.