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Pitting is a destructive form of localized corrosion that requires careful analysis and evaluation. Metal surfaces are examined first to identify and determine the extent of pitting, which may be described in terms of standard charts. Nondestructive tests may be used, but they have limitations. Pit depths provide more meaningful information and can be determined by microscopic measurement, depth gages, and other techniques. Statistical methods can be used to show the probability of pitting to estimate maximum pit depths or to show the relationship with time. The change in mechanical properties may also provide useful information.
pits, pitting, corrosion, pitting evaluation, pit depth measurement, microscopic pit-depth measurement, nondestructive tests, pitting probability, statistics
Rowe, L. C.
Supervisory research chemist, General Motors Research Laboratories, Warren, Mich.