The correct answer is Oxidation reaction. CorrosionCorrosion is a natural phenomenon that occurs due to the chemical reaction of metal in presence of Liquid or air.In which pure metal is converted into disintegrated metal.Corrosion occurs due to the loss of electrons.Additional InformationCorrosion is a Redox reaction.A redox reaction is expressed as a transfer of electrons between two reactants which participate in it.It is a combination of Reduction and Oxidation reactions.Oxidation:- ??An increase in oxidation state or loss of electrons is known as Oxidation.Reduction:-A decrease in oxidation state or gain of electrons is known as Reduction.?Redox Process through diagram