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. 60 (2011), No. 7

  • Recycle for Resource Saving and Material Evaluation Technology

    pp. 315-315

    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.60.315

  • Life Cycle Management of Port Structures - VI

    pp. 316-321

    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.60.316

    As a result of corrosion surveys, port steel structures have been damaged by splash zone corrosion at splash zone and by concentrated corrosion both at low tide level and in sea water. Corrosion damages could lead to serious reduction in strength and, in the extreme, to collapse and to unexpectedly expensive maintenance work possibly requiring total closures and consequential loss of revenue. An organic or inorganic covering method has been applied to the steel at splash zone and cathodic protection to the steel below sea water level.
    When the PW method is applied to port structures, there is the strategy of designing to a low first cost followed by more substantial maintenance in accordance with the relationship between discount factors and time for different rates. The strategy would be accompanied by increased risks of unexpected maintenance requirements and lower levels of safety. When maintenance consists of repair and shutdown, shutdown costs can be higher than repair costs and tend to dominate calculation of discounted maintenance costs. Accordingly, there will be scope to design for changes in the balance between construction and maintenance costs from the economical and technical points of view.
    This paper will look at the balance between first and maintenance costs, the application of the PW method to a steel pipe pile model and some problems in the application of the PW method to port structures.
  • Dissolution Behavior of α and γ Phases and Preferential Dissolution Mechanism of a Duplex Stainless Steel in a Simulated Crevice Solution

    pp. 328-332

    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.60.328

    The objectives of this study are to clarify the dissolution behavior of the ferritic phase (α phase) and the austenitic phase (γ phase) of a duplex stainless steel (DSS), and to propose a corrosion mechanism of the DSS through dissolution behavior of either the α phase or the γ phase at corrosion potential, respectively. Just a single phase specimen (α or γ phase specimen) was prepared by using selective dissolution of the DSS. The α phase showed less-noble corrosion potential compared to the γ phase, and passivated at less-noble potential. When the polarization curves of each phase are summed up, the obtained curve showed good agreement with the DSS polarization curve. The α phase of the DSS dissolved preferentially at corrosion potential. Based on these results, a preferential dissolution mechanism model of a DSS is proposed using internal polarization curves of each phase.
  • Numerical Analysis of Galvanic Corrosion under a Thin Electrolyte Film

    pp. 333-341

    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.60.333

    Corrosion rate of steel is controlled by oxygen diffusion through in a 10-100 μm electrolyte film. If the electrolyte thickness decreased to less than 10 μm, oxygen dissolution rate controls the corrosion rate. We developed a numerical analysis model for galvanic corrosion under a thin electrolyte film in consideration of oxygen dissolution rate and diffusion rate. In this model, oxygen salting-out effect, thermal dependence of electric conductivity and oxygen solubility were also considered. NaCl solution salt spray test (SST) and cyclic corrosion test (CCT) were conducted on Fe/Zn galvanic electrode and galvanic current was measured to compare with the numerical results. The galvanic current showed its maximum value during wetting and drying process. The galvanic current calculated by this model agreed with the SST and CCT results. In addition, the electrolyte thickness in the CCT was estimated by numerical analysis model, it is indicated that galvanic current becomes maximum value when the electrolyte thickness is 3-10 μm.

Article Access Ranking

19 Apr. (Last 30 Days)

  1. Three-dimensional Investigations of Non-metallic Inclusions in Stainless Steels before and after Machining 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. Influence of Ore Assimilation and Pore Formation during Sintering on Reduction Behavior of Sintered Ores Tetsu-to-Hagané Vol.107(2021), No.3
  4. Steam Reforming of Methane on Sponge Iron: Influence of Gas Composition on Reaction Rate ISIJ International Vol.61(2020), No.1
  5. Preface to the Special Issue on “Toward Suppression of Hydrogen Absorption and Hydrogen Embrittlement for Steels” ISIJ International Vol.61(2021), No.4
  6. Dissolution Behavior of Mg and Ca from Dolomite Refractory into Al-killed Molten Steel ISIJ International Advance Publication
  7. Effect of Rare Earth Ce on the Morphology and Distribution of Al2O3 Inclusions in High Strength IF Steel Containing Phosphorus during Continuous Casting and Rolling Process ISIJ International Vol.61(2021), No.3
  8. Improvement in Reduction Behavior of Sintered Ores in a Blast Furnace through Injection of Reformed Coke Oven Gas Tetsu-to-Hagané Vol.107(2021), No.4
  9. Rapid Method to Measure Hydrogen Diffusion Coefficient in Metal Using a Multi-sine Wave Signal ISIJ International Vol.61(2021), No.4
  10. Method for Evaluating Hydrogen Embrittlement of High-Strength Steel Sheets Considering Press Formation and Hydrogen Existence State in Steel ISIJ International Vol.61(2021), No.4

Search Phrase Ranking

19 Apr. (Last 30 Days)

  1. blast furnace
  2. coke oven gas injection
  3. blast furnace permeability
  4. blast furnace productivity
  5. slag
  6. ultrasonic inclusion
  7. activity coefficient of ti in liquid iron
  8. continuous casting of electrical steel
  9. deoxygen in liquid iron
  10. electrical steel and continuous casting