Analysis of Rust Layer Formed on Weathering Steel Exposed in Rural Area for 44Years

Sato, Hina; Nagasawa, Michiyasu; Kaneko, Michio; Iki, Hiroshi

doi:10.3323/jcorr.69.77

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…X:時間(年)，A,B:係数に従うとされ，時間と共に減少する 11,12) 。さびは初期にはγ-FeOOH が成長し，長期間曝露後には外層，(中層)，内層にわかれる 13,14,15,16,17,18,19) 。内層は Cr などを含む非晶質スピネル型酸化物あるいは α オキシ水酸化鉄の安定さび層となる。この内層はカチオン透過性を示し，外層のアニオン透過性とあわせてバイポーラ構造となることでさび全体として高いイオン透過抵抗を示し，Cl -イオンの侵入やカソード反応を抑制することで腐食速度を低下させる 20,21,22,23) 。実環境で長期間使用後の橋梁などの実用材あるいは暴露材の調査が多数行われるようになり，安定さび構造の構造やイオン移動度，添加元素の効果，融雪剤など環境因子の影響などに関して調査されてきた 12,18,19,21,22,23,24,25,26,27)…”

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Year-round Monitoring of Temperature and Humidity using a Sensor Network installed in the Hokkaido Centennial Memorial Tower

Azumi,

Sakairi,

Fushimi

et al. 2024

Tetsu-to-Hagane

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Daily and seasonal changes in temperature (T) and relative humidity (RH) were monitored using a sensor network system installed in the Hokkaido Centennial Memorial Tower, built more than 50 years ago using weathering steel, to investigate its corrosion condition. Five T-RH sensors were set at the south side wall, inside the south tower, in the semi-open central area, inside the north tower, and on the north side wall on the 4th, 14th, and 24th floors. The T changed as a function of altitude, location in the floor, season, weather, solar radiation, diurnal cycle, distance from the wall, etc. The highest T of the south wall at daytime in the winter season could rise more than 30 °C even if the outer temperature was below 0 °C due to solar radiation causing the repetition of ice or snow melting in the daytime and freezing of water at night. The change in RH and T inside the tower followed a Tomashov-type RH-T curve (high RH at low T in the morning and evening). In winter, however, T and RH distribution, i.e., high-RH (> ca.60%) area below the freezing point and low-RH area with the high-T, caused air transportation inside the tower, condensation (and freezing) in the low-T area, and drying in the high-T area. In the visual inspections, severe corrosion, such as blistering and peeling, has been observed at the bottom of the tower, where snow has accumulated, and rainwater has stayed for a long time, especially at welds and joints.

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Year-round Monitoring of Temperature and Humidity using a Sensor Network installed in the Hokkaido Centennial Memorial Tower

Azumi,

Sakairi,

Fushimi

et al. 2024

Tetsu-to-Hagane

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Effect of Layer Thickness and Temperature Difference on Oxygen Diffusion Behavior in Thin Solution Layer Formed on Metal

Sakairi

Taniguchi²

2021

Tetsu-to-Hagane

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One of the controlling factors for atmospheric corrosion is oxygen diffusion behavior in thin solution layer formed on metals. The oxygen diffusion limiting current in thin solution layer formed on Zn electrode was measured electrochemically to clarify the influence of solution layer thickness, temperature difference in the solution layer on the oxygen diffusion behavior. A solution of 10 mM NaCl was used as electrolyte to form solution layers. The solution layer thickness was controlled by masking adhesive tape with through holes. The environmental temperature, T E , was controlled by circulating temperature-controlled water and the sample temperature, T S , was controlled by a Peltier device. At T E = T S , the oxygen limiting current was independent of solution layer thickness. At T E < T S and the solution layer thickness thinner than 0.6 mm, the oxygen diffusion limiting current increased with thinning of the solution layer. The results suggest that T E and T S are also take into account as estimation of steel corrosion rate at snowy and cold region.

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Effect of Solution Temperatures on Electrochemical Behavior of Aluminum Alloys and Carbon Steel in 20 Mass％ NaCl Solutions

Shen

Sakairi

2022

ZAKAEP

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Analysis of Rust Layer Formed on Weathering Steel Exposed in Rural Area for 44Years

Cited by 3 publications

References 4 publications

Year-round Monitoring of Temperature and Humidity using a Sensor Network installed in the Hokkaido Centennial Memorial Tower

Year-round Monitoring of Temperature and Humidity using a Sensor Network installed in the Hokkaido Centennial Memorial Tower

Effect of Layer Thickness and Temperature Difference on Oxygen Diffusion Behavior in Thin Solution Layer Formed on Metal

Effect of Solution Temperatures on Electrochemical Behavior of Aluminum Alloys and Carbon Steel in 20 Mass％ NaCl Solutions

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