Corrosion

Topics: Corrosion, Oxygen, Metal Pages: 3 (848 words) Published: August 26, 2013
Corrosion is a natural process. Materials corrode due to the deterioration caused by its interaction with its environment. It is the process in which metallic atoms form compound in the presence of water and gases. (Machinery's Handbook 29th edition, 2013) “Corrosion is an irreversible interfacial reaction of a material (metal, ceramic, polymer) with its environment which results in its consumption or dissolution into the material of a component of the environment. Often, but not necessarily, corrosion results in effects detrimental to the usage of the material considered. Exclusively physical or mechanical processes such as melting and evaporation, abrasion or mechanical fracture are not included in the term corrosion."( Advances in Corrosion Engineering Lecture 1, 2013) Corrosion and erosion is two different things. Corrosion can't be caused by physical causes unlike erosion, galling or wear. Chemical attack accompanies physical deterioration as described by the terms: corrosion erosion, corrosive wear, fretting corrosion. Plastics may swell or crack , wood may split or decay, granite may erode, portland cement may leach away. But the term corrosion is presently restricted to chemical attack of metals. Rusting is only applied to the corrosion of iron or iron base alloys with formation of corrosion products consisting largely of hydrous ferric oxides. Nonferrous metals, therefore, corrode but do not rust. (Corrosion and Corrosion Control, 2013) There are three significant reasons of studying corrosion. The first area of significance is economic which includes the objective of reducing material losses resulting from the corrosion of piping, tanks, metal components of machines, ships, bridges, marine structures and so on. The second area is improved safety of operating equipment which may be hindered by corrosion and will lead to catastrophic consequences. The last significance is conservation, applied primarily to metal resources...
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