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ONLINE ISSN: 1881-9664

PRINT ISSN: 0917-0480

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Japan Society of Corrosion Engineering

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Zairyo-to-Kankyo
Vol. 69 (2020), No. 3

Zairyo-to-Kankyo Vol. 69 (2020), No. 3

Energize

Koji Fushimi

pp. 63-63

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Energize

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DOI:10.3323/jcorr.69.63
Applicability of Electrical Equivalent Circuit Analysis Based on Voigt Model to Electrochemical Degradation Diagnosis of Heavy-duty Coating on Inner Surface of Oil-strage Tank and its Validation Using Depth Profile Analysis by IR and Raman Spectroscopy

Koya Tokutake, Shinji Okazaki, Shohei Sasaki

pp. 66-72

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Applicability of Electrical Equivalent Circuit Analysis Based on Voigt Model to Electrochemical Degradation Diagnosis of Heavy-duty Coating on Inner Surface of Oil-strage Tank and its Validation Using Depth Profile Analysis by IR and Raman Spectroscopy

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DOI:10.3323/jcorr.69.66

Abstract

To investigating the long-term degradation of a heavy-duty coating, Fourier transform infrared spectroscopy （FT-IR） and Raman spectroscopy along the depth direction of a vinyl ester resin organic coating containing glass flakes was conducted. The organic coating sample was applied to the inner surface of the bottom plate of the oil storage tank, and used for approximately seventeen years. In addition, the degradation evaluation using the electrical equivalent circuit （EEC） model considering depth direction distribution of R//C time-constant （Voigt measurement model） was examined in detail.In the FT-IR along the coating depth direction, no clear peak shift and/or disappearance of the spectrum was observed. On the other hand, the baseline of the Raman shift of the coating gradually increased from near the steel substrate interface toward coating surface. These results suggest that the long-term coating degradation appears as a difference in physical change along the depth direction, and supports the result that the impedance characteristics of the coating can be well-analyzed by Voigt measurement model. Furthermore, it is expected that the DC resistance value can be estimated accurately by the EEC analysis using Voigt measurement model.
Synchrotron XAFS Analysis of Corrosion on Steel Surface Using Materials Informatics

Takahiro Ozawa, Shintaro Yamamoto, Takuya Mori, Mitsutoshi Yokomizo, Lei Li, Kazushi Yokoyama, Takumi Haruna

pp. 73-76

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Synchrotron XAFS Analysis of Corrosion on Steel Surface Using Materials Informatics

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DOI:10.3323/jcorr.69.73

Abstract

The rust layer changing behavior of initial corrosion on carbon steel was investigated by XAFS analysis using the large synchrotron radiation. Analysis of XANES spectrum and RDF by machine learning showed that the change in valence state and Fe-O covalent bond distance corresponded well with the initial corrosion rate. The distribution of valence and Fe-O bond distance of corrosion products on the steel surface showed a different tendency. These results suggest that the combination of synchrotron radiation analysis and machine learning is effective for elucidating rust formation mechanisms in initial corrosion.
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3. Analysis of Rust Layer Formed on Weathering Steel Exposed in Rural Area for 44Years Zairyo-to-Kankyo Vol.69(2020), No.3
Analysis of Rust Layer Formed on Weathering Steel Exposed in Rural Area for 44Years

Hina Sato, Makoto Nagasawa, Michio Kaneko, Hiroshi Iki

pp. 77-82

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Analysis of Rust Layer Formed on Weathering Steel Exposed in Rural Area for 44Years

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DOI:10.3323/jcorr.69.77

Abstract

Protective rust formed on Cr-Cu-Ni-P and Cr-Cu weathering steels （WSs） exposed for 44 years were analyzed to compare with previous studies for exposure test results for weathering steels. The formation of a typical protective rust composed of a polarizing layer （crystalline α-FeOOH and γ-FeOOH） and an insulation layer （fine α-FeOOH） was observed on both the weathering steels. Alloy elements were distributed in the protective rust layer. Cr enrichment was observed in the insulation layer. It was similar to previous studies and indicated that Cr contributed to form fine rust. Cu was present in the insulation layer, P was present in the insulation layer and the top of the polarizing layer, and Ni was present in the entire rust layer. Structure of the rust layers and the distribution of Cr and Ni were consistent in the results of previous studies, the exposure tests for less than 32 years, however there was a difference in the distribution of Cu and P.
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1. Introduction to the Use of Synchrotron Radiation for Corrosion Phenomenon Zairyo-to-Kankyo Vol.57(2008), No.2
2. Application of Ultra-bright Synchrotron Radiation for Environmental Degradation Studies of Structural Materials Zairyo-to-Kankyo Vol.53(2004), No.1
3. Investigation on Metal Corrosion Phenomena by Using Synchrotron Radiation and Neutron Beams Zairyo-to-Kankyo Vol.64(2015), No.7
Copper Tube Pitting Corrosion Product and Evaluation of Influence of Chloride Ion Concentration in Hot Water Environment

Takeshi Daikuhara, Yasushiro Gomi, Naoto Nakazato, Masahiro Sakai

pp. 83-89

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Copper Tube Pitting Corrosion Product and Evaluation of Influence of Chloride Ion Concentration in Hot Water Environment

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DOI:10.3323/jcorr.69.83

Abstract

In order to clarify the corrosion resistance of copper tube in which 80℃ hot water flows, pitting production test by constant potential polarization was attempted and pitting potential was measured. In case of pre-coated specimen and under the condition that the test water was flowing, pitting corrosion occurred. And pitting potential was present between 190 mV vs.SSE and 210 mV vs.SSE, when the chloride ion concentration is 10 mg/L to 100 mg/L.

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Zairyo-to-Kankyo Vol. 69 (2020), No. 3

Energize

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Applicability of Electrical Equivalent Circuit Analysis Based on Voigt Model to Electrochemical Degradation Diagnosis of Heavy-duty Coating on Inner Surface of Oil-strage Tank and its Validation Using Depth Profile Analysis by IR and Raman Spectroscopy

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Synchrotron XAFS Analysis of Corrosion on Steel Surface Using Materials Informatics

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Analysis of Rust Layer Formed on Weathering Steel Exposed in Rural Area for 44Years

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Copper Tube Pitting Corrosion Product and Evaluation of Influence of Chloride Ion Concentration in Hot Water Environment

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