Fundamental Study on Corrosion Characteristics between Steel Substrate of Adjacent Paint Coating Defects in Immersion and Wet-dry Cyclic Environments

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  • Kainuma Shigenobu
    Department of Civil Engineering, Faculty of Engineering, Kyushu University
  • Higuchi Ryo
    Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University
  • Yang Muye
    Department of Civil Engineering, Faculty of Engineering, Kyushu University

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Other Title
  • 滞水と乾湿繰り返しの環境における近接塗膜傷部の鋼素地間の腐食特性に関する基礎的研究
  • タイスイ ト カンシツ クリカエシ ノ カンキョウ ニ オケル キンセツ トマクショウブ ノ コウ キジ カン ノ フショク トクセイ ニ カンスル キソテキ ケンキュウ

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Description

<p>In the paint-coated steel structures under the air-borne sea salt deposition, corrosion damages were progressed severely where rainwater prone to be stagnated, or exposed to a wet-dry cyclic environment due to the dew condensation. The corrosion of the adjacent coating defects would progress with mutual interference because of the electrical short-circuiting under water film. In this research, a model specimen was fabricated to simulate two adjacent coating defects, and the split electrodes group constituted the relatively larger defect. The exposed steel substrate of the split electrodes corresponding to coating defects and the corrosion currents between each electrode were monitored. Besides, the macrocell current between the split electrodes group and its adjacent coating defect was also measured. Test results clarified the corrosion characteristics between the steel substrate of adjacent coating defects in immersion and wet-dry cyclic environments.</p>

Journal

  • Zairyo-to-Kankyo

    Zairyo-to-Kankyo 70 (8), 271-276, 2021-08-10

    Japan Society of Corrosion Engineering

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