A CONSIDERATION ON EROSION-CORROSION OF STEEL STRUCTURE CAUSED BY FRICTION OF SEA ICE BASED ON SIMPLE EXPERIMENT AND THEORY

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  • 簡易的な実験と解析に基づく海氷の摩擦を考慮した鋼構造物の腐食摩耗に関する一考察

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<p> We performed simple experiments on repeated removal of rust layers on a metal material surface by friction with sea ice were conducted, and developed a simple calculation model for corrosion progression based on diffusion-controlled process of oxygen under the formation of corrosion film. We found that structural steel further corroded with an increase of the removal frequency of corrosion film, and that corrosion progression did not depend on hysteresis and previous removal frequencies of corrosion film, provided each exposure time under the formation of corrosion film is the same. The calculation model showed that corrosion progresses linealy with a square root of time, and also agreed with scuh experimental trends. Tangent line of the progress curve of corrosion at the time of zero by the model also agreed well with the experimental results with high removal frequencies, which indicates the validity of the model. We demonstrated conceptually corrosion processes depending on contact frequencies of sea ice with steel strrcture, and added considerations for practical applications.</p>

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