Zairyo-to-Kankyo
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 1881-9664
PRINT ISSN: 0917-0480

Zairyo-to-Kankyo Vol. 67 (2018), No. 9

  • An Article to the 56th Japan Conference on Materials and Environments in Toyama

    pp. 355-355

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.67.355

  • Ⅳ. Electrochemical Measurements in Various Environments―Concrete―

    pp. 356-361

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.67.356

    The corrosion potential measurement and Electrochemical Impedance Spectroscopy (EIS) are explained for the observation of the corrosion of reinforced steels in concrete. In the case of environment factors in concrete, the measurements for the concentration of chloride ions and pH are applied. Besides, by using the actual concrete block, the corrosion of the steel and environmental factors are measured by these methods, and the meaning of the results are explained. Finally, the electrochemical methods are shown in the application for the actual concrete bridge.
  • Ⅳ. Electrochemical Measurements in Various Environments―Soil Environments―

    pp. 362-367

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.67.362

    Electrochemical measurement methods for studying metallic corrosion in a simulated soil are described. First of all, the characteristics of soil corrosion are briefly explained, and then the electrochemical cells for studying the soil corrosion in laboratory is illustrated. Finally, some examples of the electrochemical measurements results are shown.
  • Diffusion Behavior of D2O in Fe3O4 Film on Fe Formed in an NaOH Solution containing Oxidants

    pp. 375-380

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.67.375

    This research aimed to confirm the formation of Fe3O4 film on Fe immersed in aqueous 45 mass% NaOH solution containing some oxidants at the boiling temperature, to recognize the optimum immersion time for the formation of thick and protective film, and to reveal the absorption behavior of D2O in the Fe3O4 film at room temperature. The results were obtained as follows. It was confirmed that Fe3O4 film was formed on Fe immersed in the NaOH solution for a time more than 0.6 ks, and the film thickness increased parabolically with an increase in the immersion time. D2O absorption test was carried out to the films formed in the NaOH solution for immersion times of 1.2 and 3.6 ks. An amount of D2O absorbed into the film increased with an increase in an absorption time up to 1000 ks, and an absorption time more than 1000 ks made an amount of D2O constant. The constant amount of D2O was larger for the film formed on Fe immersed in the NaOH solution for 3.6 ks than that for 1.2 ks. The transient of the amount of D2O absorbed into the film was analyzed on the basis of Fick’s law for diffusion, and diffusion coefficients of D2O were obtained to be 5.1×10-15 and 9.9×10-15 cm2・s-1 for the films formed for 1.2 and 3.6 ks, respectively. Therefore it was estimated that the diffusion coefficient of the Fe3O4 film was in the region from 5.1×10-15 to 9.9×10-15 cm2・s-1.
  • In-situ Measurement of Electrical Conductivity of Solution within Crevice of Stainless Steel in High Temperature and High Purity Water

    pp. 381-385

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3323/jcorr.67.381

    In-situ measurement of electrical conductivity of solution within crevice of SUS316L stainless steel in 288℃ water has been conducted with newly developed electrochemical sensor system. The sensor consists of electrode (φ≈ 250μm stainless steel) and insulator (high purity alumina) directory imbedded into crevice former plate. The sensor measures local electrical conductivity of crevice solution beneath the electrode (κcrev) with electrochemical impedance method. The sensors were installed at different positions within tapered crevice of SUS316L stainless steel. The crevice specimen with the sensors were immerged into 288℃, 8 MPa, pure oxygen saturated high purity water for 100 h. κcrev at a position with crevice gap(g) of ≈ 59.3μm was 8~11μS・cm-1, least deviate from conductivity of 288℃ pure water (3.7μS・cm-1) and no localized corrosion occurred. On the contrary, κcrev at a position with g ≈4.4μm increased with time and showed maximum value of ≈1600μS・cm-1 at 70 h. Localized corrosion occurred in the vicinity of this position. Thermodynamic equilibrium calculation based on oxide in the crevice and the maximum κcrev(1600μS・cm-1) showed that pH of crevice solution can be reached to 3.53. It can be concluded that acidification occurred in tight crevice even under high purity bulk water and resulted in localized corrosion.

Article Access Ranking

24 Jul. (Last 30 Days)

  1. Production and Technology of Iron and Steel in Japan during 2020 ISIJ International Vol.61(2021), No.6
  2. Formation and Evolution of Inclusions in High Chromium Steel ISIJ International Advance Publication
  3. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  4. Effect of Ore Type and Gangue Content on Carburization and Melting Behavior of Carbon-Iron Ore Composite ISIJ International Vol.61(2021), No.6
  5. Method for Simulating Gas Permeability of a Coke Bed Including Fines Based on 3D Imaging on the Coke Particle Morphology ISIJ International Vol.61(2021), No.6
  6. Comprehensive Research about Critical Interaction Region Named Cohesive Zone in Series of Dissected Blast Furnaces ISIJ International Vol.61(2021), No.6
  7. Behavior of Jet from Nozzle Set on Side Wall of Lance ISIJ International Vol.61(2021), No.6
  8. Hydrogen Effects on the Migration of Nanoscale Cavities in Iron ISIJ International Advance Publication
  9. Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid ISIJ International Vol.61(2021), No.6
  10. Thermal Stability of Molten Slag in Blast Furnace Hearth ISIJ International Advance Publication

Search Phrase Ranking

24 Jul. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. 34crmo4 pressure vessel
  4. high hole expansion ratio
  5. 34crmo4
  6. blast furnace permeability
  7. carburization
  8. characteristics of high speed steel/ductile cast iron composite roll manufactured by electroslag remelting cladding
  9. frp cylinder using cr−mo steel liner for storing high pressure hydrogen gas
  10. gas carburization