Perforation of steel plate is of considerable interest for the longer-term safety and integrity of ships hulls and tanks and for nuclear containment systems. This paper reports on the preliminary random field characterization of the surface of two sample corroded steel plates as a trial towards generating numerically the surface topology of larger areas of steel plate. Of particular interest is the maximum depth of penetration and its dependence structure across the plate area. The potential applications and the background to the modelling of corrosion loss and pitting are reviewed briefly to set the scene for appropriate surface characterization. Contrary to the assumptions often made for the statistical characterization of maximum pit penetrations, they are highly dependent. This makes representation using extreme value probability distributions questionable. An alternative probability-based form of representation is proposed.
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