Environment/atmosphere petrochemical industry

In a restricted sense, corrosion is considered toconsistof the slow chemical and electrochemical reactions between melals and their environments. From a broader point of view corrosion is the slow destruction of any material by chemical agents and electrochemical reactions. This contrasts with erosion, which is the slow destruction of materials by mechanical agents. The character of the atmospheres to which materials arc exposed may he classified as rural, urban, industrial, urban-marine, industrial-marine, marine, tropical, and tropical-marine. In addition to these general kinds of environments, corrosion is of particular concern in the environments of chemical, petrochemical, and otherprocessing and manufacturing environments where extremely corrosive substances may be encountered. 

Sulfur dioxide is the most important gaseous stimulant in atmospheric corrosion. Combustion of sulfur-containing coal and oil and emission from metal, petrochemical, and pulp and paper industries are among the most important man-made sources. Based on the environment, Calvert and Stockwell [12] suggested several ways for SO2 to act as an oxidizer in the gas phase ... 

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