Zairyo-to-Kankyo
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ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480

Zairyo-to-Kankyo Vol. 66 (2017), No. 9

  • Welcome to OKINAWA

    pp. 285-286

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    DOI:10.3323/jcorr.66.285

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

    pp. 289-298

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    DOI:10.3323/jcorr.66.289

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

    pp. 299-304

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    DOI:10.3323/jcorr.66.299

    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 Rct obtained from the two point frequency measurement results by the method developed by Haruyama and Tsuru almost agreed with Rct estimated by spectral measurement. It was also confirmed that Rct 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 Rct 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 Rct of the probe electrode installed in the concrete.

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