Zinc-plated steel plate with excellent blackening resistance and corrosion resistance and manufacturing method therefor

摘要

The present invention relates to a zinc-plated steel plate in which corrosion resistance and blackening resistance can coexist, and a manufacturing method therefor. This zinc-plated steel plate comprises a steel plate, a Zn-Al-Mg-Si alloy-plating layer formed on the surface of the steel plate, and an Al-containing coating formed on the plating layer, and is characterized in that: the Al in the Al-containing coating is separated from the plating layer by the presence of an insulating substance; and when observing the Al-containing coating from the direction that is perpendicular to the surface thereof, the Al coverage, which is defined as the ratio of the area of the portion of the plating layer concealed by the Al in said coating to the total area of the observation field, is 75-100%. In one embodiment, this zinc-plated steel plate is obtained by applying a coating, which comprises scale-like Al particles and an insulating substance in a solvent and in which the viscosities at shear rates of 1 s