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Essay On Corrosion

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RECENT PROGRESS AND ASSESSMENT IN CORROSION PROTECTION OF STEEL BY POLYANILINE COATING: REVIEW

4. MECHANISM OF WET CORROSION
Corrosion may be defined as a physicochemical interaction between a metal surface and its environment that results in changes in the surface properties of the metal. Hence, the corrosion may lead to significant in disability of the function of the metal surface, the environment, or the technical system of which these elements form a part. Accordingly, corrosion damage is defined as a corrosion effect that causes impairment of the function of the metal, the environment, or the technical system. Corrosion is the result of an electrochemical reaction that requires an electrolyte solution and a metallic conductor between two separate areas with different potentials (anode and cathode). The formation of ferrous oxides (rust) is a well-known consequence of the corrosion process when iron and steel corrode, but many other metals are also subject to corrosion. The green-colored patina on copper and the white rust on zinc are other examples of corrosion products. The …show more content…
Based on OMICS publishing group statement overall 2,28,000 No’s Research Articles has published related to corrosion. Polyaniline is the most attractive conductive polymer because of having reactive –NH– groups in polymer chain. The unique property of polyaniline, unlike all other electroconducting polymers, is existence in different forms depending on degree of oxidation, known as: leuoemeraldine, emeraldine and perningraniline. Leucoemeraldine, e.g. leucoemeraldine base, refers to fully reduced form; emeraldine, eg. Emeralddine base, is half-oxidized, while perningraniline, eg. perningraniline base, is completely oxidized form of polyaniline. The most conducting form of polyaniline is emeraldin salt, obtained by doping or protonation of emeraldine

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