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US 2020/0002800 A1Published application
Black plated steel sheet and manufacturing method therefor
AssigneeResearch Institute of Industrial Science & Technology
InventorsHye Jeong KIM, Gab Sik BYUN, Kyung Hwang LEE, Mi Seon CHOI
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Abstract
Embodiments of the present invention provide a technique for forming a film having a high added value appearance quality and excellent hardness on the surface of a steel sheet in a short time.
Claims20
A black plated steel sheet comprising:
- a steel sheet;
- and a film located on the surface of the steel sheet;
- wherein, the film comprises:
- a Zn matrix;
- and ZnO, Al2O3, and MgO mixed in the Zn matrix,
- wherein, brightness L at the surface of the film is 60 or less (except 0).
3 more elements
A method for producing black plated steel sheet comprising:
- an air removing step of removing some or all of the air inside a sealed container;
- an oxygen input step of injecting oxygen (O2) into the sealed container after the air removing step;
- and
- a humidifying heat treatment step of Zn plated steel sheet or Zn alloy-based plated steel sheet in the sealed container after the oxygen input step;
- wherein, in the humidifying heat treatment step, a brightness L value on the surface of the plated steel sheet is controlled to 60 or less (except 0).
2 more elements
Dependencies are inferred from the claim text.