Zinc Plated GI Galvanised Iron Washer, Round

Zinc-plated washers are flat, circular steel plates with a zinc coating that prevents the steel from corroding. Zinc plating is often used to protect iron and steel from water and other elements in the air that cause corrosion. Zinc is more reactive than iron, so it oxidizes in preference to the iron object. However, the zinc coating will eventually break down and oxidize into rust. Zinc coating is most useful in environments where the metal is only occasionally in conditions where it can corrode.