Fundamental Study on Electrochemical Mechanism between Adjacent Paint Coating Defects of Common Carbon Steel

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  • Kainuma Shigenobu
    Department of Civil Engineering, Faculty of Engineering, Kyushu University
  • Mashimoto Gaku
    Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University
  • Yang Muye
    Department of Civil Engineering, Faculty of Engineering, Kyushu University
  • Sajima Takao
    Department of Mechanical Engineering, Faculty of Engineering, Kyushu University

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Other Title
  • 近接する塗膜傷間における鋼材腐食の電気化学機構に関する基礎的研究
  • キンセツ スル トマクショウ カン ニ オケル コウザイ フショク ノ デンキ カガク キコウ ニ カンスル キソテキ ケンキュウ

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Abstract

<p>The corrosion would often progress with the mutual interaction between adjacent defects, especially at some locations of paint-coated steel structures where the rainwater or dew stagnated in long-term, because of the occurrence of electrical short circuit around the multiple coating defects.</p><p>The objective of this study is to investigate the electrochemical mechanism of mutual interaction between the adjacent coating defects in a stagnant water environment. The model specimens embedded with a plurality of electrodes were fabricated to simulate coating defects, and the corrosion currents were measured between these electrodes. In case of the two electrodes with different diameters, the measurement results show that the anode reaction would be fixed in the electrode with a relative larger diameter, while the cathode reaction would be fixed in the electrode with a small diameter. In addition, when the diameter of the electrode is less than 20 mm, it has been clarified that the linear correlation exists between the area ratio of adjacent electrodes and the macrocell current density, and the relationship was formulated.</p>

Journal

  • Zairyo-to-Kankyo

    Zairyo-to-Kankyo 67 (11), 466-473, 2018-11-15

    Japan Society of Corrosion Engineering

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