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Numerical Simulation of Under-film Corrosion of Coated Steel Panels with Multiple Coating Defects in Marine Environments

Corrosion in the water ballast tank (WBT) is caused by under-film corrosion originating from point or linear coating film defects. Osawa et al.(Proc. OMAE2016-54508) developed a two-dimensional cellular automaton (CellA) for under-film corrosion analysis and succeeded in consistent analysis of coating film deterioration and corrosion depletion. In CellA analyses the cellular automaton parameters governing coating performance and metallic corrosion are given by random number fields without spatial structure. This is over-simplified for large panel simulation and it is necessary to improve CellA in consideration of non-uniformity of the parameters. In this report corrosion tests of coated steel panels with multiple scribes are performed showing non-uniformity in coating blistering and corroded surface profile. Next a generation technique for non-normal random field with a spatial covariance structure is developed. This technique is adopted in the cell automaton parameter determination process. With this improved CellA program the under-film corrosion simulations of multiple-scribed coated panels are carried out. The calculated probability of occurrence of the cross-sectional asymmetry is compared with that measured. Based on this result the effectiveness of the developed analysis method is verified.

Product Number: 51319-12969-SG
Author: Naoki Osawa
Publication Date: 2019
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