Question

Zinc and Aluminium are very high in metal reactivity series yet they resist corrosion to great extent exlain

Answer 1

Actually, aluminium and zinc are highly reactive metals and so even if their first layer is oxidized to form the corresponding oxides but the oxides do not further degrade and so the rest metal do not oxidize and if this layer is broken then also its layer itself undergo corrosion from atmospheric air and moisture but the metal article remains prevented

Answer 2

Corrosion is an oxidation process of metals in the presence of water. For iron this process is known as rusting. The process of oxidation w.r.t aluminium and zinc in corrosion.The rusting of ordinary iron and steel is the most common form of corrosion.The effects of corrosion are often (ok, essentially always) undesirable. Rust is generally formed at the surface of the metal, and doesn't adhere to the surface.When rust flakes off, the underlying metal is exposed to further corrosion (a process called pitting), and eventually the structural integrity of the metal disintegrates