Plated steel
This plated steel includes: a steel; and a plating layer formed on the steel, in which the plating layer contains, as a chemical composition, by mass %, Zn: 1.0% to 30.0%, Mg: 0% to 10.0%, Si: 0.05% to 10.0%, Fe: 0 to 10.0%, 0% to 5.00% in total of one or two or more selected from Ca: 0% to 3.00%, Sb: 0% to 0.50%, Pb: 0% to 0.50%, Sr: 0% to 0.50%, Sn: 0% to 1.00%, Cu: 0% to 1.00%, Ti: 0% to 1.00%, Ni: 0% to 1.00%, Mn: 0% to 1.00%, Cr: 0% to 1.00%, La: 0% to 1.00%, Ce: 0% to 1.00%, Zr: 0% to 1.00%, and Hf: 0% to 1.00%, and a remainder of Al and impurities, a microstructure of the plating layer contains an α phase which is a solid solution of Al and Zn, and the α phase contains a Zn phase having a grain size of 10 to 200 nm in a number density of 10/100 μm 2 or more.
1. A plated steel comprising:
a steel; and
a plating layer formed on the steel,
wherein the plating layer contains, as a chemical composition, by mass %,
Zn: 1.0% to 30.0%,
Mg: 0% to 10.0%,
Si: 0.05% to 10.0%,
Fe: 0 to 10.0%,
0% to 5.00% in total of one or two or more selected from
Ca: 0% to 3.00%,
Sb: 0% to 0.50%,
Pb: 0% to 0.50%,
Sr: 0% to 0.50%,
Sn: 0% to 1.00%,
Cu: 0% to 1.00%,
Ti: 0% to 1.00%,
Ni: 0% to 1.00%,
Mn: 0% to 1.00%,
Cr: 0% to 1.00%,
La: 0% to 1.00%,
Ce: 0% to 1.00%,
Zr: 0% to 1.00%, and
Hf: 0% to 1.00%, and
a remainder of Al and impurities,
a microstructure of the plating layer contains an α phase which is a solid solution of Al and Zn, and
the α phase contains a Zn phase having a grain size of 10 to 200 nm in a number density of 10/100 μm 2 or more.
2. The plated steel according to claim 1 ,
wherein, in the chemical composition, by mass %,
Mg: 0.5% to 10.0% is satisfied.
3. The plated steel according to claim 1 ,
wherein, in the chemical composition, by mass %,
Mg: 3.0% to 7.0%, and
Zn: 7.0% to 18.0%
are satisfied.
4. The plated steel according to claim 1 ,
wherein an Fe—Al-based alloy layer is formed between the steel and the plating layer, and
an average thickness of the Fe—Al-based alloy layer is 1.0 to 10.0 μm.
5. The plated steel according to claim 1 ,
wherein the Zn phase is contained in the α phase in a number density of 30/100 μm 2 or more.
6. The plated steel according to claim 2 ,
wherein an Fe—Al-based alloy layer is formed between the steel and the plating layer, and
an average thickness of the Fe—Al-based alloy layer is 1.0 to 10.0 μm.
7. The plated steel according to claim 2 ,
wherein the Zn phase is contained in the α phase in a number density of 30/100 μm 2 or more.