ZINC-BASED PLATED STEEL SHEET
[Object] To provide a zinc-based plated steel sheet excellent in coating adhesiveness after hot pressing more conveniently. [Solution] A zinc-based plated steel sheet according to the present invention includes: a zinc-based plated steel sheet that is a base metal; and a surface treatment layer formed on at least one surface of the zinc-based plated steel sheet and containing one or more magnesium compounds. The amount of the one or more magnesium compounds contained is not less than 0.2 g/m 2 and not more than 5.0 g/m 2 per one surface on a magnesium oxide basis.
1 . A zinc-based plated steel sheet comprising:
a zinc-based plated steel sheet that is a base metal; and
a surface treatment layer formed on at least one surface of the zinc-based plated steel sheet and containing one or more magnesium compounds,
wherein the amount of the one or more magnesium compounds contained is not less than 0.2 g/m 2 and not more than 5.0 g/m 2 per one surface on a magnesium oxide basis.
2 . The zinc-based plated steel sheet according to claim 1 ,
wherein the surface treatment layer further contains at least one of one or more phosphorus-containing compounds, one or more vanadium-containing compounds, one or more aluminum-containing compounds, one or more silicon-containing compounds, and one or more chromium-containing compounds in the following range as the contained amount per one surface,
the one or more phosphorus-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a P basis,
the one or more vanadium-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a V basis,
the one or more aluminum-containing compounds: not less than 0.0 g/m 2 and not more than 0.005 g/m 2 on an Al basis,
the one or more silicon-containing compounds: not less than 0.0 g/m 2 and not more than 0.005 g/m 2 on a Si basis, and
the one or more chromium-containing compounds: not less than 0.0 g/m 2 and not more than 0.01 g/m 2 on a Cr basis.
3 . The zinc-based plated steel sheet according to claim 1 ,
wherein the one or more magnesium compounds are magnesium oxide.
4 . The zinc-based plated steel sheet according to claim 3 , wherein the amount of the magnesium oxide contained is not less than 0.4 g/m 2 and not more than 2.5 g/m 2 per one surface on a magnesium oxide basis.
5 . The zinc-based plated steel sheet according to claim 3 , wherein a particle size of the magnesium oxide is not less than 5 nm and not more than 100 nm.
6 . The zinc-based plated steel sheet according to claim 3 , wherein a particle size of the magnesium oxide is not less than 10 nm and not more than 50 nm.
7 . The zinc-based plated steel sheet according to claim 1 , wherein the one or more magnesium compounds are one or two compounds selected from the group consisting of magnesium nitrate and magnesium sulfate.
8 . The zinc-based plated steel sheet according to claim 7 , wherein the amount of the one or two compounds selected from the group consisting of magnesium nitrate and magnesium sulfate contained is not less than 0.4 g/m 2 and not more than 2.5 g/m 2 per one surface.
9 . The zinc-based plated steel sheet according to claim 1 , wherein the zinc-based plated steel sheet is a zinc-based plated steel sheet for hot pressing.