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Zairyo-to-Kankyo Vol. 67 (2018), No. 7

ISIJ International
belloff
ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480
Publisher: Japan Society of Corrosion Engineering

Backnumber

  1. Vol. 73 (2024)

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  30. Vol. 44 (1995)

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  33. Vol. 41 (1992)

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Zairyo-to-Kankyo Vol. 67 (2018), No. 7

Ⅳ. Electrochemical Measurements in Various Environments―ACM Type Corrosion Sensor―

Wataru Oshikawa

pp. 273-279

DOI:

10.3323/jcorr.67.273

Abstract

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. Electrochemical Measurements in Various Environments―ACM Type Corrosion Sensor―

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Ⅳ. Electrochemical Measurements in Various Environments―Atmospheric Corrosion II （Electrochemical Impedance Method）―

Hideki Katayama

pp. 280-286

DOI:

10.3323/jcorr.67.280

Abstract

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. Electrochemical Measurements in Various Environments―Atmospheric Corrosion II （Electrochemical Impedance Method）―

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Electrochemical Measurement of Protective Paint Systems for Steel Road Bridges－Results of the Exposure Test in Marine Environment for 30 Years－

Shota Mizuba, Tomonori Tomiyama, Atsushi Miyata, Makoto Sano, Kiyoto Masuda

pp. 287-291

DOI:

10.3323/jcorr.67.287

Abstract

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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Electrochemical Measurement of Protective Paint Systems for Steel Road Bridges－Results of the Exposure Test in Marine Environment for 30 Years－

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Corrosion Behavior Investigation of Weathering Steel by Using Electrical Resistance Technique

Masataka Omoda, Daisuke Mizuno, Shinichi Miura, Nobuyuki Ishikawa

pp. 292-297

DOI:

10.3323/jcorr.67.292

Abstract

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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Corrosion Behavior Investigation of Weathering Steel by Using Electrical Resistance Technique

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Corrosion Progress Evaluation of a Rebar in Concrete by the Corrosion Monitoring Using the Tafel Extrapolation

Toshinori Kanemitsu, Satoshi Takaya, Satoru Yamamoto, Kenshiro Takeko, Takashi Yamamoto

pp. 298-303

DOI:

10.3323/jcorr.67.298

Abstract

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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Corrosion Progress Evaluation of a Rebar in Concrete by the Corrosion Monitoring Using the Tafel Extrapolation

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