Zairyo-to-Kankyo

Zairyo-to-Kankyo

Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480

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Predecessor

Volume 66, Issue 9

Displaying 1-3 of 3 articles from this issue

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Commentary

Welcome to OKINAWA

Wataru Oshikawa

2017 Volume 66 Issue 9 Pages 285-286
Published: September 15, 2017
Released on J-STAGE: April 25, 2018

DOIhttps://doi.org/10.3323/jcorr.66.285

JOURNAL FREE ACCESS

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Technical Report

Investigation of Error Reduction Methods for Electrochemical Corrosion Potential Measurement in High Temperature-High Purity Water

Masahiko Tachibana

2017 Volume 66 Issue 9 Pages 289-298
Published: September 15, 2017
Released on J-STAGE: April 25, 2018

DOIhttps://doi.org/10.3323/jcorr.66.289

JOURNAL FREE ACCESS

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The supersensitive measurement method for general electric circuit was applied to the ECP measurement method in high temperature water which simulated BWR temperature condition. Some issues which concerned with the measurement were clarified. Additionally, the countermeasures were divided to reduce measurement errors.

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Research Paper

Research of Corrosion Monitoring of Rebar in Concrete with Electrochemical Impedance Spectroscopy

Hiroyuki Tokieda, Tatsuki Okamoto, Yoshinao Hoshi, Isao Shitanda, Masa ...

2017 Volume 66 Issue 9 Pages 299-304
Published: September 15, 2017
Released on J-STAGE: April 25, 2018

DOIhttps://doi.org/10.3323/jcorr.66.299

JOURNAL FREE ACCESS

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We developed a probe electrode for impedance measurement to investigate of rebar corrosion in concrete. Impedance measurements of the electrode in an aqueous solution simulating the transition zone of concrete and rebar interface were carried out. The charge transfer resistance R_ct obtained from the two point frequency measurement results by the method developed by Haruyama and Tsuru almost agreed with R_ct estimated by spectral measurement. It was also confirmed that R_ct was drastically decreased by de-passivation following the decrease in pH. Furthermore, impedance measurement of the probe electrode in concrete specimen was carried out.It was confirmed that R_ct was small when the depth of setting the probe electrode was shallow. It was concluded that the state of the rebar/concrete interface can be evaluated by R_ct of the probe electrode installed in the concrete.

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