Steel strips are coated for protection through a process called galvanization. Galvanization involves applying a layer of zinc to the surface of the steel strips. This is done by either hot-dip galvanizing or electroplating.
In hot-dip galvanizing, the steel strips are immersed in a bath of molten zinc at a temperature of around 450°C (842°F). The zinc reacts with the steel, forming a protective layer of zinc-iron alloy on the surface. This layer provides excellent corrosion resistance and protects the steel from rusting.
Electroplating, on the other hand, involves immersing the steel strips in an electrolyte solution containing zinc ions. A direct electric current is then passed through the solution, causing the zinc ions to bond with the steel surface. This creates a thin but durable layer of zinc coating that safeguards the steel from corrosion.
Both hot-dip galvanizing and electroplating provide effective protection for steel strips. The zinc coating acts as a barrier, preventing moisture and corrosive elements from reaching the steel surface. Additionally, even if the coating gets scratched or damaged, the sacrificial properties of zinc ensure that it corrodes first, protecting the underlying steel.
Overall, steel strips are coated for protection using galvanization techniques, which involve the application of a zinc layer. This process significantly enhances the durability and longevity of the steel, making it more resistant to corrosion and extending its lifespan.
