Galvanized steel is technically a coated material, but it is worth mentioning here. ... This means that the zinc layer will combine with the oxygen more readily than the iron in the steel will. This creates a zinc oxide layer that prevents the formation of iron oxide, thus eliminating the possibility of rust forming.

Does galvanized steel eventually rust?

Galvanized steel takes a long time to rust, but it will eventually rust. This type is carbon steel that has been galvanized, or coated, with a thin layer of zinc. ... Like aluminum, zinc is highly reactive to oxygen in the presence of moisture, and the coating prevents the iron in the steel from further oxidation.

Why does scratched galvanized iron not rust?

Galvanising forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate metal. the zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still b protected by the remaining zinc.