PHOSPHATE SOLUTION FOR STEEL SHEET HAVING ZINC AND ZINC-BASED ALLOY COATING LAYER AND STEEL SHEET HAVING ZINC OR ZINC-BASED ALLOY COATING LAYER BY PRODUCED THE 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 sheet produced using the same. According to one embodiment of the present invention, a phosphate solution for a zinc or zinc-based alloy plated steel sheet includes Mo ions, Ca ions, and phosphoric acid ions. According to another embodiment of the present invention, the zinc or zinc-based alloy plated sheet includes a base steel sheet; a zinc or zinc-based alloy plating layer formed on the base steel sheet; and a phosphate film formed on the plated layer, wherein the phosphate film contains molybdenum compounds, Ca and phosphate. According to the present invention, pitting phenomenon generated upon phosphate treatment on the steel sheet can be prevented, and further, excellent corrosion resistance can be applied to the phosphate film.;COPYRIGHT KIPO 2014