SURFACE TREATMENT SOLUTION COMPOSITION CONTAINING TRIVALENT CHROMIUM AND INORGANIC COMPOUND, AND METHOD FOR MANUFACTURING HOT DIP GALVANIZED STEEL SHEET SURFACE-TREATED USING SAME

摘要

The present invention provides a surface treatment solution composition comprising: 30 to 51 wt% of a trivalent chromium compound comprising chromium phosphate (A) and chromium nitrate (B) and having a content ratio of A/(A + B) that satisfies 0.3 to 0.6; 5 to 15 wt% of silane coupling agent; 0.2 to 3 wt% of vanadium-based anti-corrosive rust inhibitor; 3 to 12 wt% of colloidal silica; 0.5 to 5 wt% of polysiloxane copolymer; and 14 to 61.3 wt% of water, a hot dip galvanized steel sheet surface-treated using same, and a manufacturing method thereof. The hot dip galvanized steel sheet treated with the surface treatment solution composition containing trivalent chromium has an excellent corrosion resistance, blackening resistance, pipe-forming oil reactivity, and alkali resistance.