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Development of Under-Film Corrosion Simulation Method Based on Cellular Automaton

[+] Author Affiliations
Naoki Osawa, Seiru Takeno, Shino Katayama, Kristov Ivan William

Osaka University, Suita, Japan

Yasuhide Kanou, Yasumi Kawamura

Yokohama National University, Yokohama, Japan

Atsushi Takada

National Maritime Research Institute, Mitaka, Japan

Kazuhiko Shiotani

JFE Steel Corporation, Kurashiki, Japan

Paper No. OMAE2016-54508, pp. V004T03A002; 11 pages
doi:10.1115/OMAE2016-54508
From:
  • ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 4: Materials Technology
  • Busan, South Korea, June 19–24, 2016
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4995-8
  • Copyright © 2016 by ASME

abstract

A simulation method for under-film corrosion has been developed for epoxy coated steel panels within a ship’s Water Ballast Tank (WBT) environment. The incubation and extension of coating failure is simulated by using two-dimensional cellular automaton, and the steel diminution is simulated by modifying IACS CSR-H’s 3-phases probabilistic model. Analysis parameters are determined by using the results of onboard exposure and cyclic corrosion tests performed by Shiotani et al. (2012, 2015). The change in corroded surface shape of epoxy coated scribed steel panels made of conventional steel and corrosion resistant steel (CRS) exposed in an ore carrier’s WBT for 4.8 years is simulated. The simulated coating deterioration (blister) area and the corroded surface profile agree well with those measured. This demonstrates the effectiveness of the developed simulation method and the determined parameters. The differences in analysis parameters between conventional steel and CRS suggest that CRS can reduce the harmful effect of the active corrosion region on the remaining coating life at the blister’s frontline and the corrosion under the blister.

Copyright © 2016 by ASME

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