PHOSPHATE-TREATED ZINC-BASED PLATED STEEL SHEET HAVING EXCELLENT DISCOLORATION RESISTANCE AND FILM ADHESIVENESS

摘要

A phosphate-treated zinc plated steel sheet comprising a zinc plated steel sheet and a phosphate coating formed on at least one side of the zinc plated steel sheet, wherein the phosphate coating has a ratio of a three-dimensional surface area to a two-dimensional surface area by a laser microscope of 1.7 to 8.8 .