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材料と環境 Vol. 67 (2018), No. 7

ISIJ International
belloff
オンライン版ISSN: 1881-9664
冊子版ISSN: 0917-0480
発行機関: Japan Society of Corrosion Engineering

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材料と環境 Vol. 67 (2018), No. 7

Ⅳ.各種環境での電気化学測定―ACMセンサ―

押川 渡

pp. 273-279

抄録

The measurement method of the ACM sensor under the atmospheric corrosion environment was described with actual samples. By analyzing the sensor output and humidity data obtained every 10 minutes, it is possible to estimate the wetting time and sea salt attachment amount, and by correcting the sensor output during rainfall, corrosion rate in the outdoor can be estimated.

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Ⅳ.各種環境での電気化学測定―ACMセンサ―

Ⅳ.各種環境での電気化学測定―大気腐食Ⅱ(電気化学インピーダンス法)―

片山 英樹

pp. 280-286

抄録

Atmospheric corrosion is a complex phenomenon that goes on under thin water film while being affected by various environmental factors. In this paper, the atmospheric corrosion researches using the electrochemical impedance method were described. The impedance characteristics under thin water film, the corrosion monitoring method using electrochemical impedance and the application example, and the corrosion monitoring research in actual outdoor environment were introduced.

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Ⅳ.各種環境での電気化学測定―大気腐食Ⅱ(電気化学インピーダンス法)―

鋼道路橋用防食塗膜の電気化学的測定―30年海洋暴露試験結果―

水場 翔大, 冨山 禎仁, 宮田 敦士, 佐野 真, 増田 清人

pp. 287-291

抄録

Various protective paint systems for steel road bridges have been exposed for 30 years with steel actual-size specimens located off the Suruga coast. From the obtained results, it became clear that the response of electrochemical measurement is correlated roughly with degraded level of the paint systems.

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鋼道路橋用防食塗膜の電気化学的測定―30年海洋暴露試験結果―

電気抵抗法を用いた耐候性鋼の腐食挙動の評価

面田 真孝, 水野 大輔, 三浦 進一, 石川 信行

pp. 292-297

抄録

It is important to understand the relation between changeable environmental condition and corrosion behavior of each weathering steel for maintenance management of weathering steel structures. For this subject, it is thought that corrosion monitoring by using the electrical resistance technique is the most suitable. In this study, corrosion behavior in ISO16539 Method B that simulates atmospheric corrosion environment and actual use environment was measured. The difference of corrosion behavior among weathering steels could be clearly measured by the unit μm both in laboratory test and exposure test. However, in only high salinity environment, the output corrosion loss of sensor was larger than actual corrosion loss by increasing the partial electrical resistance caused by large roughness due to locally corrosion on the sensor. And applicable salinity environment for this sensor was decided up to 1 mdd of airborne sea salt. Thus, by using the electrical resistance technique, the difference of corrosion behavior of each weathering steel can be measured, furthermore, it has possibility that environmental condition in which weathering steels show significant corrosion resistance might be clarified by comparing with environmental factors.

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電気抵抗法を用いた耐候性鋼の腐食挙動の評価

Tafel外挿法を用いた腐食モニタリングによるコンクリート中の鉄筋腐食進行評価

金光 俊徳, 高谷 哲, 山本 悟, 竹子 賢士郎, 山本 貴士

pp. 298-303

抄録

To evaluate progress of the rebar corrosion in the RC structure quantitatively, the change with time of corrosion rate of a rebar in concrete is measured by the corrosion rate monitoring using the Tafel extrapolation method and the small size embedded sensor. As a result, using the prediction model of the corrosion rate from result of the measurement, the measurement from the middle of in-service period can estimate corrosion mass loss with around ±20% of real corrosion mass loss.

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Tafel外挿法を用いた腐食モニタリングによるコンクリート中の鉄筋腐食進行評価

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