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Structural Engineering and Mechanics
  Volume 65, Number 2, January25 2018 , pages 191-201

Evaluation method for time-dependent corrosion depth of uncoated weathering steel using thickness of corrosion product layer
Shigenobu Kainuma, Yuya Yamamoto, Jin-Hee Ahn, Young-Soo Jeong

    The corrosion environments in a steel structure are significantly different depending on the individual parts of the members. To ensure the safety of weathering steel structures, it is important to evaluate the time-dependent corrosion behavior. Thus, the progress and effect of corrosion damage on weathering steel members should be evaluated; however, the predicted corrosion depth, which is affected by the corrosion environment, has not been sufficiently considered until now. In this study, the time-dependent thicknesses of the corrosion product layer were examined to quantifiably investigate and determine the corrosion depth of the corroded surface according to the exposure periods and corrosion environments. Thus, their atmospheric exposure tests were carried out for 4 years under different corrosion environments. The relationship between the thickness of the corrosion product layers and mean corrosion depth was examined based on the corrosion environment. Thus, the micro corrosion environments on the skyward and groundward surfaces of the specimens were monitored using atmospheric corrosion monitor sensors. In addition, the evaluated mean corrosion depth was calculated based on the thickness of the corrosion product layer in an atmospheric corrosion environment, and was verified through a comparison with the measured mean corrosion depth.
Key Words
    corrosion depth; corrosion product layer; weathering steel; atmospheric exposure test; electro-magnetic coating thickness tester
Shigenobu Kainuma: Department of Civil Engineering, Kyushu University, 744, Motooka, Fukuoka 8190395, Japan
Yuya Yamamoto: Planning Department, Japan Expressway Holding and Debt Repayment Agency, 1-1-2, Takashima, Yokohama 2200011, Japan
Jin-Hee Ahn: Department of Civil Engineering, Gyeongnam National University of Science and Technology,
33 Dongjin-ro, Jinju, Gyeongnam 52725, Republic of Korea
Young-Soo Jeong: Seismic Simulation Test Center, Pusan National University, 49 Busandaehak-ro, Yansan, Gyeongnam 50612, Republic of Korea

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