Corrosion and conditioning tests

Corrosion, which is the unintended destructive chemical or electrochemical reaction of a material with its environment, frequently leads to service failures of metal parts or renders them susceptible to failure by some other mechanism. All corrosion reactions are electrochemical in nature and depend on the operation of electrochemical cells at the metal surface. This applies even to generalized uniform chemical attack, in which the anodes and cathodes of the cells are numerous, small, and dose together. In addition to a basic understanding of electrochemistry, however, the analysis of corrosion failures and the development of suitable corrective measures requires the application of the principles of chemistry and metallurgy.

The type of corrosion, its rate, and the extent to which it progresses are influenced by the nature, composition, and uniformity (or non uniformity) of the environment and the metal surface in contact with that environment. These factors usually do not remain constant as corrosion progresses, but are affected by externally imposed changes and by changes that occur as a direct consequence of the corrosion process itself.
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