The hot-dip coated steel sheets are frequently associated with problems such as scratching and corrosion. To improve performance of hot-dip coated steel sheets, a thin organic coating method has been introduced. In this study, plasma gas discharge was applied to modify the surface of a polymer coated-steel sheet to be hydrophobic. Since the corrosion resistance of steel is strongly related to water permeation, the surface hydrophobicity of materials was introduced by CF₃H plasma exposure. The corrosion property before and after the plasma treatment was investigated in a slat spray tester of 3.5 % NaCl fog at 35 ℃. The results showed that the CF₃F plasma-induced polymer exhibited significant retardation of corrosion.