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. 62 (2013), No. 5

  • To Reconstructing Tohoku against Memory Fading, Rumors and Adverse Winds

    p. 175

    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.62.175

  • Atmospheric Corrosivity Estimation by Multi-channel Quartz Crystal Microbalance Method

    pp. 176-181

    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.62.176

    One of the methods to monitor metal corrosion behavior in the atmosphere as a mass change of the ng/cm2 order continually is the quartz crystal microbalance(QCM)method. The corrosion rates of multiple metals were simultaneously monitored with the multi-channel QCM sensors, and the concentration of corrosive gases were studied by the QCM measurement based on the inverse estimation method. The relationship between the corrosion rates and the environmental factors was formulated by considering the corrosion rates of silver, cobalt, and copper as the function of SO2, NO2, H2S and relative humidity. And the inverse estimation of the concentrations of corrosive gases can be derived from the basis of these approximate equations. Moreover, in order to evaluate the atmospheric corrosivity in an electrical control unit room in a steelmaking plant, the temperature, the relative humidity and corrosion rates of metals on QCM sensors were monitored. The temperature, the relative humidity, and the corrosion rates in a given day were distributed according to the normal probability law. The concentrations of H2S, SO2 and NO2 were estimated from the mean values of the relative humidity and the corrosion rates. The gas concentrations thus obtained by this method were roughly close to those analyzed by conventional measurement methods. The atmospheric corrosivity will be able to estimate based on the monitoring of the corrosion rates with multi-channel QCM sensors.
  • Study on Retrofit Design of Port Steel Structures with Cathodic Protection of Galvanic Anode System

    pp. 192-197

    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.62.192

    We investigated retrofit design in cathodic protection(CP)with galvanic anodes made from an aluminum alloy. In conventional retrofit design, the decrease in CP current reduction(which affects the life of anodes)is estimated based on nominal durability values. The current reduction rate falls to a level far below the design value, leading to an increased number of facilities in which the anode life exceeds the design service life. As this trend is due to exaggerated design, it is necessary to review retrofitting methods in order to enable more effective and economical maintenance. After detailed analysis and discussion, we developed an innovative methodology for an optimized maintenance system in galvanic anode CP. To test the assumptions made, we conducted on-site, shortterm testing with an actual structure and confirmed the validity of the new design methodology. The method, which takes current reduction into consideration, allowed more accurate prediction of anode life and a reduction in the initial costs of CP facilities.
  • Reduction Mechanism of Nitrate on Titanium

    pp. 198-203

    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.62.198

    Reduction mechanism of nitrate ion on titanium electrode was investigated using electrochemical method. Cathodic polarization curve of titanium was measured in nitric acid with different concentrations of ions (H,NO3,HNO2). Reduction mechanism of nitrate ion on titanium was investigated from Tafel slope and reaction order of each ions. It was considered that reduction of titanium oxide was involved in reduction mechanism of nitrate ion on titanium, and reduction mechanism was suggested as follows.
    NO3 ⇄ NO3ad      (QE)
    TiO2 + H+ + e ⇄ TiOOH      (QE)
    NO3ad + TiOOH → (NO3-TiOOH)ad     (RDS)
    (NO3 - TiOOH)ad + H+ + e → NO2ad + TiO2 + H2O

Article Access Ranking

22 May. (Last 30 Days)

  1. Influence of Thermomechanical Treatment on Delayed Fracture Property of Mo-Bearing Medium-Carbon Steel ISIJ International Vol.62(2022), No.2
  2. Comparison of Oxidation Behavior of Various Reactive Elements in Alloys during Electroslag Remelting (ESR) Process: An Overview ISIJ International Advance Publication
  3. Interaction Coefficients of Mo, B, Ni, Ti and Nb with Sn in Molten Fe–18mass%Cr Alloy ISIJ International Vol.62(2022), No.3
  4. Fundamentals of Silico-Ferrite of Calcium and Aluminium (SFCA) and SFCA-I Iron Ore Sinter Bonding Phase Formation: Effects of MgO Source on Phase Formation during Heating ISIJ International Vol.62(2022), No.4
  5. Dissolution Kinetics of Synthetic FeCr2O4 in CaO–MgO–Al2O3–SiO2 Slag ISIJ International Vol.62(2022), No.4
  6. Removal of Inclusions using Swirling Flow in a Single-Strand Tundish ISIJ International Advance Publication
  7. Phenomenological Understanding about Melting Temperature of Multi-Component Oxides Tetsu-to-Hagané Vol.108(2022), No.4
  8. Assessment of Blast Furnace Operational Constraints in the Presence of Hydrogen Injection ISIJ International Advance Publication
  9. Influence of Acicular Ferrite Microstructure on Toughness of Ti-Rare Earth Metal (REM)-Zr Killed Steel Tetsu-to-Hagané Vol.108(2022), No.5
  10. Ironmaking Using Municipal Solid Waste (MSW) as Reducing Agent: A Preliminary Investigation on MSW Decomposition and Ore Reduction Behavior ISIJ International Advance Publication

Search Phrase Ranking

22 May. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. steel
  5. galvannealing
  6. jet impingement
  7. jet impingement + cooling + runout table
  8. nitrogen
  9. refractory
  10. valve spring steel