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. 53 (2004), No. 10

  • Determination of the Reduction Sequence in Cathodic Reduction of Duplex Copper Oxide Films Formed in Air

    pp. 472-478

    Bookmark

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

    Log in / Sign Up
    Two plateaus are found in the potential vs. time curve when the duplex copper oxide film is cathodically reduced at a constant current density. However, there are contradictory mechanisms to assign these two plateaus. We must solve this problem to use catholic reduction for characterization of the duplex copper oxide film. The sub-committee for catholic reduction of copper oxide films constituted in 2002 and has been discussing the reduction sequence in catholic reduction of the duplex copper oxide film. We performed round robin experiments in three companies to determine the reduction sequence in the potential vs. time curve. In these experiments, the electrolyte was 0.1M KCl and reduction current density was 50μA/cm2. The specimens for catholic reduction were oxidized in a constant temperature humidity chamber at 60°C and 90%RH for 72h. The change in the XPS spectra of specimen surfaces revealed that cupric oxide was reduced in the first plateau, while cuprous oxide was reduced in the second plateau. Furthermore, we found that the cupric oxide was directly reduced to metallic copper by an experiment using the standard CuO/Cu specimen.
  • Electrochemical Noise Analysis on Corrosion Behavior of Carbon Steel Covered with Mill Scale

    pp. 481-488

    Bookmark

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

    Log in / Sign Up
    Corrosion diagnosis and the corrosion mechanism investigations of carbon steel covered with mill scale in distilled water and aqueous solution containing various component (Cl-, SO42-, HCO3-, SiO2) were performed by using ENA. It has been clarified that the corrosion patterns could be discriminated by the measurements of potential time series and that the effects of the water quality factor on the corrosion could be discussed. Bicarbonate ions whose concentration is less than 10ppm accelerate the corrosion of carbon steel covered with mill scale. Besides, the bicarbonate ions whose concentration is 100ppm stabilize the mill scale. In neutral solution, the dissolved silica accelerates the anode reaction of carbon steel. Contrary to this in alkaline solution, the dissolved silica gives the corrosion resistance to the carbon steel with covered with mill scale.
  • Fracture Dynamics of Natural Rust and Location Accuracy of Corrosion on Tank Bottom Plate

    pp. 489-494

    Bookmark

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

    Log in / Sign Up
    Fracture dynamics of atmospheric rusts were studied by Lamb-wave acoustic emission (AE) analysis. Fracture parameters of the rust were estimated by the waveform matching of the S0-mode packet of Lamb AEs monitored during tensile- and compressive-bending of steel plates with atmospheric rust produced by out-door exposure for 500 days. Generation times of rust fractures are estimated to be less than 1μs, however, the crack volumes are several hundred to thousand times larger those of the delayed fractures. Next we monitored water-born longitudinal AEs from rust fracture on the bottom plate of the water-storage cylindrical tanks using the sensors mounted on the side-wall, and estimated their source locations. AEs were monitored by the AE system with 20dB amplification, however, their source location accuracy was poor due to the low S/N ratio.
  • Corrosion Protection of Steel by Calcareous Electrodeposition in Seawater (Part 5)

    pp. 495-501

    Bookmark

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

    Log in / Sign Up
    A new method was proposed of analyzing the double layers structures of calcareous deposit films formed on the surface of steel cathodically polarized in seawater. The method was based on the assumption that pore-water in the deposits should be distributed between the layers according to the difference of their water-affinities. From the assumption, various structural factors concerning the double layers in the deposits were derived. In order to examine the validity of the theoretical model for analyzing the double layers structures, calcareous deposit films with various Ca/Mg compositions was prepared through either varying hydrodynamic state of seawater around the cathode or diluting seawater under a constant cathodic current density and temperature. The application of the above model to these deposits proved the validity of the model to analyze the double layers structures.

Article Access Ranking

04 Dec. (Last 30 Days)

  1. Structural and Mechanical Characterizations of Top Dross in a Molten Zinc Bath ISIJ International Advance Publication
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Determination of Facet Plane and Cleavage Fracture Plane of the Top Dross Formed in a Molten Zinc Bath ISIJ International Advance Publication
  4. Effect of Hydrogen Concentration in Reducing Gas on the Changes in Mineral Phases during Reduction of Iron Ore Sinter ISIJ International Advance Publication
  5. Effect of Microstructure at Coating Layer on Fatigue Strength in Hot-Dip Galvanized Steel ISIJ International Vol.60(2020), No.11
  6. Identification of Cracking Issues and Process Improvements through Plant Monitoring and Numerical Modelling of Secondary Cooling during Continuous Casting of HSLA Steels ISIJ International Advance Publication
  7. Contributions of Grain Size and Crystal Orientation to Fatigue Crack Deflection and Branching Behavior in Low Carbon Steel Plates ISIJ International Advance Publication
  8. Crystal Structure Analysis of Top Dross in Molten Zinc Bath by First Principles Calculation and Synchrotron X-ray Diffraction ISIJ International Advance Publication
  9. Volumetric Strain Dependence of Quantum Diffusion of Hydrogen in bcc Iron ISIJ International Advance Publication
  10. Comprehensive Technologies for Iron Ore Sintering with a Bed Height of 1000 mm to Improve Sinter Quality, Enhance Productivity and Reduce Fuel Consumption ISIJ International Vol.60(2020), No.11

Search Phrase Ranking

04 Dec. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. blast furnace productivity
  4. bearing 52100 100cr6 rolling contact fatigue
  5. steel
  6. toshihiro kitamura
  7. dwtt pressed notch
  8. electromagnetic stirring
  9. fatigue crack path prediction in udimet 720 nickel-based alloy single crystals
  10. induction heating