Current Affiliation Organization 【 display / non-display 】

Current Affiliation Organization 【 display / non-display 】

University 【 display / non-display 】

University 【 display / non-display 】

Graduate School 【 display / non-display 】

Graduate School 【 display / non-display 】

External Career 【 display / non-display 】

External Career 【 display / non-display 】

Affiliated academic organizations 【 display / non-display 】

Affiliated academic organizations 【 display / non-display 】

Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

Thesis 【 display / non-display 】

Thesis 【 display / non-display 】

• SmFeO₃-Sm₂O₃系触媒のVOC酸化活性とセンサ特性

  2015.03

• 土壌中における炭素鋼の腐食機構に及ぼす水分量の影響

  2023.09

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• Color Tone of Corrosion Products and Estimation of Rust Composition by Image Processing

  Fujihashi Kenta, Oshikawa Wataru

  Tetsu-to-Hagane ( The Iron and Steel Institute of Japan )  110 ( 15 ) 1225 - 1236   2024.11 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Effect of Diffusion Rate of Oxygen on Soil Corrosion and Evaluation of that in Soil

  Fujihashi Kenta, Nakagami Ryosuke, Oshikawa Wataru

  Zairyo-to-Kankyo ( Japan Society of Corrosion Engineering )  73 ( 8 ) 200 - 209   2024.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  <p>Soil corrosion rate for architecture and civil engineering is regarded as 0.02 mm/year regardless of the soil. However, it is considered that corrosion rates of each soil are different because soil properties such as particle size, water content, chemical composition and pH are different. In this study, we measured dissolved oxygen diffusion coefficient of each soil and each water content and evaluated the charge transfer resistance of each dissolved oxygen concentration by AC impedance method, to investigate the effect of dissolved oxygen diffusion on soil corrosion.</p><p>It was suggested that major oxygen diffusion path in soil is air that dispersed into soil. As a result, dissolved oxygen diffusion coefficient was correlated with air-filled porosity. It is suggested that the corrosion rate in soil increase with increase of air-filled porosity (decrease of water content) in case of considering not metal-water interface surface area.</p>

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• Effect of Soil Particle Diameter on Soil Corrosion

  Fujihashi Kenta, Nakagami Ryosuke, Oshikawa Wataru

  Zairyo-to-Kankyo ( Japan Society of Corrosion Engineering )  72 ( 1 ) 22 - 30   2023.01 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  The main foundation structure of photovoltaic power generation facilities is a steel pile foundation. Soil corrosion rate is regarded as 0.02 mm/year regardless of the soil. However, it is considered that corrosion rates of each soil are difference. In this study, we estimated the soil corrosion environment by measuring the physical properties of soil and evaluated the charge transfer resistance of each soil environment by AC impedance method that regarded soil as electrolyte, in order to investigate the effect of soil particle size on soil corrosion.Glass beads of uniform sphere haven't been packed close-packed structure, and porosity of soil with particle size distribution was nearly equal to regardless of particle size. But in case of the soil that included particles less than 50μm in a large quantity, porosity of the soil was increase. Porosity of soil that had similar particle size distribution was nearly equal regardless of water content. Therefore, it is suggested that the change of soil water content was replacement liquid phase and gas phase. The charge transfer resistance of soil corrosion decreased with decrease of gas phase ratio in soil. Therefore, it is suggested that the charge transfer resistance of soil corrosion might be estimated from the soil particle size distribution and water content.

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• Exposure Corrosion Test of Metal Pile for Shallow Soil Layer

  Fujihashi Kenta, Okuji Makoto, Oshikawa Wataru, Tahara Akira, Shinohara Tadashi, Katayama Hideki

  Zairyo-to-Kankyo ( Japan Society of Corrosion Engineering )  67 ( 5 ) 216 - 221   2018.05 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• VOC sensing behavior of semiconducting Sm2O3/SmFeO3 mixtures

  Yoshiteru Itagaki, Kenta Fujihashi, Hiromichi Aono, Masami Mori, Yoshihiko Sadaoka

  Journal of the Ceramic Society of Japan ( 公益社団法人 日本セラミックス協会 )  123 ( 10 ) 961 - 966   2015.06 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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