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

Zairyo-to-Kankyo Vol. 70 (2021), No. 6

  • Data Driven R&D and Corrosion Science and Engineering

    pp. 181-182

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    DOI:10.3323/jcorr.70.181

  • Reductive Corrosion Behavior of ITO in a Phosphoric Solution

    pp. 183-186

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    DOI:10.3323/jcorr.70.183

    The reductive corrosion behavior of ITO, which can occur when ITO and Al are coupled, has been investigated electrochemically in phosphoric acid solutions. ITO was reduced to metallic In and Sn both when coupled with Al and when polarized to below -0.7 V vs. SCE potentiostatically. The reductive degradation of ITO was successively suppressed by the addition of nitric acid into the phosphoric acid solution because of the preferential reduction of nitrate ions. Although ITO cannot be dissolved anodically in a phosphoric acid solution, the reduced component can be dissolved anodically. Thus, the desired amount of ITO can be removed electrochemically in a phosphoric acid solution.
  • Synchrotron μ-XRD Analysis of Corrosion Products on Exposed Steel Using Measurement Informatics

    pp. 187-191

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    DOI:10.3323/jcorr.70.187

    The crystal structure of the rust layer was visualized in the initial corrosion behavior of carbon steel using synchrotron radiation μ-XRD analysis. Analysis of the μ-XRD spectrum by neural networks showed that the rust layers had a multilayer structure of inner layer (α-FeOOH) and outer layer (α-FeOOH and γ-FeOOH) from 1 week exposure, and α-FeOOH single phases were observed at the corrosion progress point after 4 week exposure.
  • Time Dependence of Corrosion Behavior on Ta in NaOH Solutions

    pp. 192-198

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    DOI:10.3323/jcorr.70.192

    The time dependence of corrosion behavior on tantalum used in nuclear fuel reprocessing equipment in sodium hydroxide solution was investigated by immersion corrosion tests, and the mechanism of aging change was discussed from surface observations and electrochemical measurements. The immersion tests were carried out at room temperature with NaOH concentrations ranging from 1 to 7 mol・L-1 and immersion periods ranging from 24 to 168 h, respectively. The corrosion rate increased with NaOH concentration, but peaked with immersion time and then decreased. The time to peak of corrosion rate was shorter with higher NaOH concentration. The XRD patterns and Raman spectra at the surface of the specimens immersed in 7 mol・L-1 NaOH solution more than 48 h showed Na8Ta6O19 formation. The polarization resistance showed a constant value or an increase after a decrease immediately after immersion. It was suggested that the change in corrosion rate is affected by the formation of film during immersion, since the time dependence of polarization resistance and the sum of film resistance and charge transfer resistance have same tendencies. The film was considered to be mainly Na8Ta6O19 formed by the dissolution of Ta.
  • The Trying Estimatimation for Propagation Quantity of Crevice Corrosion by CCS Test for SUS304 Stainless Steel in Seawater Environment

    pp. 199-208

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    DOI:10.3323/jcorr.70.199

    The propagation current density (i) of crevice corrosion depending on the external potential (Eout) is measured by the Continuous Current Step (CCS) method. The relate equation of Eouti is obtained by CCS method. This current density should reflect the active corrosion rate in the metal chloride solution with low pH so called anolyte in crevice. According to this hypothesis, the propagation quantity of crevice corrosion (Qcrev(CCS)) will be electrochemically calculated by this relate equation of Eouti.The aim of this study is to compare the crevice corrosion quantity (Qcrev(vol.)) obtained by the corrosion volume of the specimen after the exposure test in natural sea water with Qcrev(CCS) calculated by the corrosion potential change during the exposure test.The obtained results of this study were as follows:The correlation between Qcrev(vol.) and Qcrev(CCS) was described as the following equation.Qcrev(vol)=8.8850+0.2847・Qcrev(CCS)It was confirmed that the crevice corrosion quantity during exposure test in natural sea water could be estimated from the time-dependent change of the corrosion potential in the exposure test by the relate equation of Eouti obtained from the CCS method in the laboratory.

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