What is galvanized steel?

What is galvanized steel?
A: Galvanized steel is a steel sheet coated with a zinc layer on the surface of a base material, such as cold-rolled or hot-rolled steel, through processes such as hot-dip galvanizing or electroplating. Its core function is to improve the corrosion resistance of the base material and extend its service life.
What are the core components of galvanized steel?
A: It consists primarily of two parts: the base material (mostly low-carbon steel, such as Q195 or Q235) and the zinc coating (pure zinc or a zinc alloy, such as a zinc-aluminum-magnesium alloy).
What is the essential difference between galvanized steel and ordinary cold-rolled steel?
A: The core difference lies in the "surface protective layer"-ordinary cold-rolled steel lacks an anti-rust coating and is easily rusted by oxidation of the iron base material. Galvanized steel relies on the "sacrificial anodic protection" and "physical isolation" of the zinc layer to significantly improve rust resistance and is suitable for a wider range of applications (such as outdoor and humid environments).
What are the common colors of galvanized steel?
A: The typical color is "silver-gray" (the natural color of the pure zinc coating). Passivation treatment may produce a "colorful passivation color" (rainbow colors for improved corrosion resistance) or a "black passivation color" (for specific decorative purposes). After long-term exposure, it may appear white (white rust) or dark gray (stable oxide film).
What does the "zinc coating weight" of galvanized sheet mean?
A: It refers to the weight of zinc per unit area of ​​the galvanized sheet surface. It is the core indicator for measuring the thickness of the zinc coating and is measured in g/m² (single or double-sided). For example, "80g/m² double-sided" means 80g of zinc per square meter on each side. The thicker the zinc coating, the greater the rust resistance.