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Theories of corrosion: - Corrosion can be explained by the following two theories . 1. Dry or chemical corrosion. 2. Wet or electrochemical corrosion. Q1. hanism of dry corrosion in metal oxides. of the metal oxide layer formed at the interface plays an important role xtent of further corrosion of the metal. The Corrosion may occur either in a dry environment or in an aqueous medium. The former is called dry corrosion and the latter is wet corrosion. Dry Corrosion: Dry DRY CORROSION WET CORROSION RUSTING OF IRON GALVANIC CORROSION When 2 different metals or alloys come in contact with each other, the less noble metal corrodes cathode. 16. Page 17. Differences between dry and wet corrosion.WET & DRY CORROSION. ○ Wet / aqueous corrosion is the major form of corrosion which occurs at or near room temperature and in the presence of water. Dry Corrosion and Wet Corrosion - Free download as PDF File (.pdf), Theories of Corrosion: [1] Direct chemical attack or Chemical or Dry corrosion oxidation ) and electro – chemical corrosion . The preferred classification here is ( 1 ) Wet corrosion . and ( 2 ) Dry corrosion .