Black flat steel is made from cold-rolled steel sheets, resulting in a black surface and a smooth texture. The material is usually ordinary carbon structural steel, which has high strength and hardness, but poor corrosion resistance.
Galvanized flat steel is obtained by coating the surface of black flat steel with a layer of zinc. The surface appears silvery white and has the luster and texture of zinc, which can improve its corrosion resistance and service life.
Since black flat steel has not been treated in any way, its surface is easily corroded by natural factors such as sunlight, wind, rain, or chemicals, so its corrosion resistance is poor.
The surface of galvanized flat steel is coated with a layer of zinc, which can effectively prevent the iron material from contacting the external environment with oxygen, water vapor, and other corrosion problems. Therefore, galvanized flat steel has good corrosion resistance.

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