Hot-dip zinc-based plated steel sheet

1. A hot-dip zinc-based plated steel sheet comprising:

a base steel sheet that is a metal substrate;

a hot-dip zinc-based plating layer provided on the base steel sheet; and

a surface treatment layer formed on at least one surface of the hot-dip zinc-based plating layer, wherein

the surface treatment layer is a mixture of granular oxide and resin, and the surface treatment layer contains more than or equal to 0.1 g/m 2 and less than or equal to 1.2 g/m 2 of granular oxide per one surface on a metal basis in which, in a temperature range of 900 to 1300 K, standard free energy of formation (ΔG 0 ) of oxide is smaller than standard free energy of formation (ΔG 0 Zn ) of zinc oxide and larger than standard free energy of formation (ΔG 0 Al ) of aluminum oxide at an identical temperature, vanadium-containing compounds in a range of more than or equal to 0.0024 g/m 2 and less than or equal to 0.01 g/m 2 on a V basis as a content per one surface, and resin,

the granular oxide has a particle size of more than or equal to 3 nm and less than or equal to 100 nm, and

the resin contains a polyurethane resin, a polyester resin, an epoxy resin, a (meth)acrylic resin, or a phenol resin,

with the proviso that an oxide of silicon is excluded from the granular oxide.

2. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

the surface treatment layer further contains at least one selected from phosphorus-containing compounds, copper-containing compounds, aluminum-containing compounds, and chromium-containing compounds;

in the following range as a content per one surface,

the phosphorus-containing compounds: more than 0.0 g/m 2 and less than or equal to 0.01 g/m 2 on a P basis,

the copper-containing compounds: more than 0.0 g/m 2 and less than or equal to 0.02 g/m 2 on a Cu basis,

the aluminum-containing compounds: more than 0.0 g/m 2 and less than or equal to 0.005 g/m 2 on an Al basis, and

the chromium-containing compounds: more than 0.0 g/m 2 and less than or equal to 0.01 g/m 2 on a Cr basis,

wherein, if any of the phosphorus-containing compounds, copper-containing compounds, aluminum-containing compounds, and chromium-containing compounds are present, these compounds must be in the ranges above.

3. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

the base steel sheet has a chemical composition of, in mass %,

C: 0.05 to 0.4%,

Si: less than or equal to 0.5%,

Mn: 0.5 to 2.5%,

P: less than or equal to 0.03%,

S: less than or equal to 0.01%,

sol. Al: less than or equal to 0.1%,

N: less than or equal to 0.01%,

B: 0 to 0.005%,

Ti: 0 to 0.1%,

Cr: 0 to 0.5%,

Nb: 0 to 0.1%,

Ni: 0 to 1.0%,

Mo: 0 to 0.5%, and

the balance: Fe and impurities.

4. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

the base steel sheet has a chemical composition of, in mass %,

C: 0.05 to 0.4%,

Si: less than or equal to 0.5%,

Mn: 0.5 to 2.5%,

P: less than or equal to 0.03%,

S: less than or equal to 0.01%,

sol. Al: less than or equal to 0.1%,

N: less than or equal to 0.01%,

B: 0 to 0.005%,

Ti: 0 to 0.1%,

Cr: more than 0% and less than or equal to 0.5%,

Nb: 0 to 0.1%,

Ni: 0 to 1.0%,

Mo: 0 to 0.5%, and

the balance: Fe and impurities, and

the base steel sheet satisfies a relationship of

Mn+Cr: 0.5 to 3.0%.

5. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

the granular oxide is metal oxide.

6. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

the granular oxide is an oxide of titanium.

7. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

the granular oxide has a particle size of more than or equal to 5 nm and less than or equal to 30 nm.

8. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

a content of the granular oxide per one surface on a metal basis is more than or equal to 0.2 g/m 2 and less than or equal to 0.8 g/m 2 .

9. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

the surface treatment layer contains more than or equal to 0.05 g/m 2 and less than or equal to 0.35 g/m 2 of an oxide of an alkaline-earth metal per one surface on a metal basis in which, in a temperature range of 900 to 1300 K, standard free energy of formation (ΔG 0 ) of oxide is smaller than standard free energy of formation (ΔG 0 Al ) of aluminum oxide at an identical temperature.

10. The hot-dip zinc-based plated steel sheet according to claim 9 , wherein

the oxide of the alkaline-earth metal is an oxide of calcium or an oxide of magnesium.

11. The hot-dip zinc-based plated steel sheet according to claim 9 , wherein

the content of the oxide of the alkaline-earth metal per one surface on a metal basis is more than or equal to 0.05 g/m 2 and less than or equal to 0.2 g/m 2 .

12. The hot-dip zinc-based plated steel sheet according to claim 1 , wherein

the hot-dip zinc-based plated steel sheet is a hot-dip zinc-based plated steel sheet for hot pressing.

13. A hot-dip zinc-based plated steel sheet comprising:

a base steel sheet that is a metal substrate;

a hot-dip zinc-based plating layer provided on the base steel sheet; and

a surface treatment layer formed on at least one surface of the hot-dip zinc-based plating layer, wherein

the surface treatment layer is a mixture of granular oxide and resin, and the surface treatment layer contains more than or equal to 0.1 g/m 2 and less than or equal to 1.2 g/m 2 of granular oxide per one surface on a metal basis in which, in a temperature range of 900 to 1300 K, standard free energy of formation (ΔG 0 ) of oxide is smaller than standard free energy of formation (ΔG 0 Zn ) of zinc oxide and larger than standard free energy of formation (ΔG 0 Al ) of aluminum oxide at an identical temperature, and further contains more than or equal to 0.05 g/m 2 and less than or equal to 0.35 g/m 2 of an oxide of an alkaline-earth metal per one surface on a metal basis in which, in a temperature range of 900 to 1300 K, standard free energy of formation (ΔG 0 ) of oxide is smaller than standard free energy of formation (ΔG 0 Al ) of aluminum oxide at an identical temperature, vanadium-containing compounds in a range of more than or equal to 0.0024 g/m 2 and less than or equal to 0.01 g/m 2 on a V basis as a content per one surface, and resin,

the granular oxide has a particle size of more than or equal to 3 nm and less than or equal to 100 nm, and

the resin contains a polyurethane resin, a polyester resin, an epoxy resin, a (meth)acrylic resin, or a phenol resin,

with the proviso that magnesium is excluded from the alkaline-earth metal.