This work aims the search of environmentally friendly pre-treatment technologies to develop chromate replacements for metal finishing industries due to its toxicological properties. Since the corrosion resistance of steel was strongly related to water permeation, galvanized steel sheets were treated with various hydrophobic silane compounds and water-suspended polymer solution. The corrosion property after was investigated in a slat spray tester with 3.5 wt% NaCl at 35 ℃. The results showed that both Zirconium/silane double coatings on the galvanized steel exhibited significant retardation of corrosion.