LOW TEMPERATURE CURABLE CR-FREE PRETREATMENT SOLUTION CONTAINING CONDUCTIVE POLYMER FOR ORGANIC COATED STEELS, METHOD FOR PERPARING PRETREATMENT LAYER USING THE PRETREATMENT SOLUTION, PRETREATMENT LAYER PREPARED BY THE METHOD AND STEEL SHEET COMPRISING THE PRETREATMENT LAYER

摘要

A chromium-free solution composition for treating the surface of a steel sheet, a method for preparing the resin coated steel sheet pretreatment layer by using the composition, and a resin coated steel sheet are provided to improve corrosion resistance, resin adhesion and solution stability. A solution composition for treating the surface of a steel sheet comprises 1.0-20.0 wt% of a resin mixture comprising a urethane-based resin and an acrylic resin in a ratio of 1:3 to 3:1 by weight; 0.5-20.0 parts by weight of a water-soluble conductive polymer based on 100 parts by weight of the resin mixture; 0.1-5.0 wt% of a curing agent; 5-10.0 wt% of at least one kind of organometallic oxide selected from an organic titanate and an organic zirconate; 1.0-25.0 wt% of at least one kind of silicate mixture selected from colloidal silica having a pH of 7.0-10.0 and a metal silicate compound; and a solvent.