Estimation of extremes in corrosion engineering

Summary This paper reviews a number of extreme value models which have been applied to corrosion problems. The techniques considered are used to model and predict the statistical behaviour of corrosion extremes, such as the largest pit, thinnest wall, maximum penetration or similar assessment of corrosion phenomenon. These techniques can be applied to measurements over a regular grid or to measurements of selected extremes, and can be adapted to accommodate all values over a selected threshold, or a selected number of the largest values-or only the single largest value. Data can come from one coupon or several coupons, and can be modelled to allow for dependence on environmental conditions, surface area examined, and duration of exposure or of experimentation. The techniquesare demonstrated on data from laboratory experiments and also on data collected in an industrial context.

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