Question

The chemistry of corrosion of iron is essentially an electrochemical phenomenon. Explain the reactio:rs occurring during the corrosion of iron in the atmosphere.

Answer 1

Water vapours on surface of iron dissolves oxides to form acid which dissociatis to given H+ ions.
`H_2O+CO_2toH_2CO_3hArr2H^+CO_(3^(2-))`
At anode : `Fe(s) toFe^(2+)+2e^(-)` [ in preence of H+ ions]
At cathode : Electrons realeased through metal reached another spot where `H^+` and oxygen takes up `e^-s` and reduction takes place.
`O_2+4H^++4e^-to2H_2OC(1)`