Classification of corrosion process : Depending upon the nature of corrosion, and the factors affecting it, the corrosion may be classified as follows.
(i) Chemical corrosion : This type of corrosion, usually takes place when
(a) The reactive gases come in the contact with metals at high temperatures for instance corrosion in chemical industry.
(b) The Slow dissolution of a metal takes place when kept in contact with the non conducting media containing organic acids.
(ii) Bio-chemical corrosion or Bio-corrosion: This is caused by the action of microorganisms. The soils of the specific composition, stagnant water and definite organic products greatly favour the bio-corrosion.
(iii) Electrochemical corrosion : It occurs in a gaseous atmosphere in the presence of moisture, in soils and in solutions.
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