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Abstract The relativity between image feature and pit distribution characteristic of corroded surface is studied.According to measure data of carbon steel samples corroded in soil，it can be sure that the distributions of corrosion pit diameter and depth obey exponential function equation in certain region.In other words，there exists a good linear section between corrosion pit diameter or depth and corresponding appearance probability in a double logarithmic coordinate system,which linear slope is fractal dimension (FD) for pit diameter or depth distribution denoting the roughness of corroded surface.Simultaneously a new approach is proposed based on box-counting method to estimate the fractal dimensions,D2d and D3d of corrosion images.Use a great number test data to prove a good linear relation between image D2d and D3d respectively with FD for pit diameter distribution and pit depth distribution.They are approximating equality in value.This result provides a simple and rapid method to research the rule of pit distribution on real corroded surface according to corrosion image feature.
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Received: 14 September 2005
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