CORROSION RESISTANCE AND ANTI-CORROSION CHARACTERISTICS OF INTERFACE BETWEEN Al-5Mg THERMAL SPRAYED COATING AND HEAVY DUTY PAINT COATING IN AIRBORNE SEA SALT ENVIRONMENT

DOI Web Site 1 Citations 10 References
  • KAINUMA Shigenobu
    九州大学大学院 工学研究院社会基盤部門
  • YANG Haoxuan
    九州大学大学院 工学府都市環境システム工学専攻
  • YANG Muye
    九州大学大学院 工学研究院社会基盤部門
  • MUTO Kazuyoshi
    株式会社富士技建 研究開発室
  • MIYATA Hirokazu
    西日本高速道路株式会社 四国支社 高知高速道路事務所 改築第二課

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Other Title
  • 飛来海塩環境におけるAl-5Mg合金溶射と重防食塗装の取合部の耐食・防食特性

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<p> The objective of this study is to clarify corrosion resistance and anti-corrosion characteristics of the interface between Al-5Mg thermal sprayed coating and heavy duty paint coating in airborne sea salt environment. Atmospheric exposure tests were carried out in highly corrosive atmospheric environments with and without the effect of rainfall washing-off on adhered airborne sea salt. A strip-shaped coating defect was introduced into each specimen, and at the defect area the steel substrate was exposed to the atmosphere. After the exposure tests, the coating blister scans and AC impedance measurements were performed on specimens, while the elemental analyses using SEM-EDX, EPMA, etc. were also conducted. The results indicate that the deterioration occurred from the steel base-exposed portion with the corrosion resistance reduction in the overlapping layer, which deteriorated earlier than that in the single sprayed coating regardless of the atmospheric environment of the exposure sites. Besides, comparing to an airborne salt deposit environment with rain-washing effect, it was clear that this tendency would be more evident in an environment without rain-washing effect.</p>

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