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Zairyo-to-Kankyo Vol. 67 (2018), No. 10

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

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Zairyo-to-Kankyo Vol. 67 (2018), No. 10

Ⅳ. Electrochemical Measurements in Various Environments―Chemical Plants―

Masazumi Miyazawa

pp. 392-397

DOI:

10.3323/jcorr.67.392

Abstract

This paper introduces the application of electrochemical measurement system to the maintenance management in chemical plant. In the application of this measurement system, it needs the construction of the maintenance management system and the confirmation of the level of measurement accuracy to apply the system. In the construction of the maintenance management system, it is required to clarify what kind of information is needed. In the confirmation of the level of measurement accuracy, it is necessary the level of measurement accuracy and the correspondence to the required information for maintenance management.

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Ⅳ. Electrochemical Measurements in Various Environments―Chemical Plants―

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Corrosivity Evaluation for Steel Members near the Atmosphere-liquid Interface Using the Ground Corrosion Sensor

Shigenobu Kainuma, Muye Yang, Shuji Ishihara

pp. 404-415

DOI:

10.3323/jcorr.67.404

Abstract

The near-ground boundary of an embedded steel member is especially vulnerable to corrosion, which can be caused by long-term exposure to stagnant rainwater or other environmental factors. Many cases of fracturing due to progressive local corrosion have been reported. This study undertakes a fundamental examination of the output properties and practicality of a corrosion sensor devised by the authors to evaluate the corrosion resistance of steel members near the ground. The output characteristics of this sensor were investigated by simulating NaCl aqueous solution environments, including the atmosphere-liquid interface. In addition, an indoor exposure test was also conducted using uncoated steel plates in the same aqueous solution. The actual corrosion depths obtained from the exposure test were compared with the estimated corrosion depths according to sensor measurements. Moreover, an evaluation method using the corrosion sensor has been proposed for the prediction of the time-dependent corrosion depth of steel members.

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Corrosivity Evaluation for Steel Members near the Atmosphere-liquid Interface Using the Ground Corrosion Sensor

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Evaluation of the Applicability of Dose-response Functions to the Data of Outdoor Exposure Tests for Carbon Steel and Zinc in Japan

Shin Ohara, Akio Kosaki, Yoshiharu Shumuta, Naoto Murao

pp. 416-425

DOI:

10.3323/jcorr.67.416

Abstract

Dose-response functions （DRFs） are examined in terms of applicability to the data of outdoor exposure tests in Japan （JWTC data） in order to improve estimation methods of assessing the domestic atmospheric corrosivity of carbon steel and zinc. From literature survey, the ISO9223DRF is selected as a suitable DRF. Estimated corrosion rate by the ISO9223DRF shows insufficient agreement with the measured one from the JWTC data. The coefficients of the ISO9223DRF are redetermined by a nonlinear least-squares regression model based on the JWTC data （fitted DRF）. Estimated corrosion rate by the fitted DRF shows better agreement with the measured one from the JWTC data in terms of correlation with the measured one and fraction of the estimated one within errors of －50～＋100％.

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Evaluation of the Applicability of Dose-response Functions to the Data of Outdoor Exposure Tests for Carbon Steel and Zinc in Japan

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Effect of Borate Addition to Fresh Water on the Self-passivation Behavior of Carbon Steel

Masayoshi Ozawa, Tomoyasu Imai, Masatsune Akashi

pp. 426-434

DOI:

10.3323/jcorr.67.426

Abstract

This research was conducted with the objective of developing knowledge on the integrity evaluation of carbon steel in the primary containment vessel at the time of taking out fuel debris at the Fukushima Daiichi Nuclear Power Station （1F） of TEPCO Holdings Corporation. The effect of borate administration on the self-passivation behavior of carbon steel was evaluated based on the time course of the natural corrosion potential in the natural immersion test, and the analysis results of water before and after the test. From the results, a method to estimate the self-passivation tendency by the carbon steel self-passivation index（SPI）SPI＝（0.5[SO42－]＋[Cl－]）/（[HCO3－]＋9[B（OH）4－]）was presented. Here, [B（OH）4－]E was obtained as B（OH）4－-equivalent by the following formula.[B（OH）4－]E＝[M-Alk]－[HCO3－]That is, the self-passivation tendency of carbon steel in a reactor containment vessel in a borate-containing solution environment may be estimated by sodium pentaborate dosage concentration, M-alkalinity, sulfate ion concentration, chloride ion concentration and bicarbonate ion concentration. According to this technique, when the SPI is less than 0.282, carbon steel self-passivates.

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Effect of Borate Addition to Fresh Water on the Self-passivation Behavior of Carbon Steel

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