PHOSPHATE SOLUTION FOR ZINC- OR ZINC-BASED ALLOY-PLATED STEEL SHEET, AND ZINC OR ZINC-BASED ALLOY-PLATED STEEL SHEET USING SAME

摘要

The present invention relates to a phosphate solution for a zinc- or zinc-based alloy-plated steel sheet, and a zinc- or zinc-based alloy-plated steel sheet using the same. One embodiment of the present invention provides a phosphate solution for a zinc- or zinc-based alloy-plated steel sheet which contains a Mo ion, a Ca ion and a phosphate ion. Another embodiment of the present invention provides a zinc- or zinc-based alloy-plated steel sheet comprising: a base steel sheet; a zinc-based or zinc alloy-based plating layer formed on the base steel sheet; and a phosphate film formed on the plating layer, wherein the phosphate film comprises a molybdenum compound, Ca and a phosphate. According to the present invention, it is possible to provide: a phosphate solution capable of preventing pitting generated when a steel sheet is treated with a phosphate and providing excellent corrosion resistance to a phosphate film; and a zinc- or zinc-based alloy-plated steel sheet using the same.