Abstract
Pitting corrosion is a threat to structural durability, causing stress concentration and severe effects on bearing capacity. In this study, two types of corrosion pits were observed in an existing beam exposed to a marine environment for forty years: a wide-shallow pit and narrow-deep pit. Considering the pitting corrosion depth and width as key parameters, an ellipse model was proposed to describe the pit shape. The ratio between the maximum and the average corrosion penetration, called pitting factor, was found to fluctuate between 2 and 4 for the wide-shallow pit and between 4 and 8 for the narrow-deep pit.
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