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. 56 (2007), No. 2

  • Recent Trend of the Education of Universities

    pp. 41-42

    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.56.41

  • Evaluation of Crevice Corrosion Incubation Time for Stainless Steels Polished Just before Potentiostatic Tests in Chloride Ion Environments

    pp. 56-61

    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.56.56

    Incubation time for crevice corrosion of stainless steels in environments containing chloride ions such as sea water was evaluated by potentiostatic methods. Current density of specimens with and without crevice were measured at a current - time curve just after polish of the sample's surface. And, dependence of QINCU (amount of dissolved metal ions during estimated incubation time) and tINCU ( estimated incubation time for crevice corrosion) on potential were clarified by the experiments above.
    The tINCU was decreased with increasing potentials. On the other hand, QINCU was almost independent of potentials. Decrease of tINCU with increasing potentials was due to increase of iINCU with potential. Amount of dissolved metal ions required for occurrence of crevice corrosion and depassivation pH which is fundamental cause for crevice corrosion are found to be almost independent of potential.
  • Experimental Evaluation of Crevice Corrosion Depth for Stainless Steels in Sea Water Environments

    pp. 62-69

    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.56.62

    Growth rates of crevice corrosion for various stainless steels in sea water environments were evaluated under potentiostatic condition. And perforation time for the stainless steel plate was estimated by time dependence of the maximum crevice corrosion depth.
    Crevice corrosion resistance of stainless steels deteriorated with increase of chloride ion concentration. Crevice corrosion initiated and grew for all the stainless steels tested in this study in the solutions with more than 100 ppm chloride ion. Dmax, maximum crevice corrosion depth, was approximated as power low function as Dmax=A·tm. Term A, Dmax at 1 hour, was increased with chloride ion concentration. On the other hand, term m showed from 0.3 to 0.5 independent with chloride concentration. It seems that values of m should be explained by dissolved morphology at corrosion crevice and assuming rate determining step for metal dissolution. For example, perforation time of crevice corrosion for the 1 mm thick SUS 304 stainless steel in 19 ppm chloride ion solution at 50ºC was estimated about 4 years, 21 years for SUS316L stainless steel and 66 years for SUS329J4L stainless steel. And perforation times for SUS304 stainless steel were almost same under potentiostatic condition between 300 mV (vs. SSE) and 440 mV (vs. SSE).
    x

    Readers Who Read This Article Also Read

    1. How to Enjoy Research Life Zairyo-to-Kankyo Vol.55(2006), No.5
    2. 解説特集「腐食・防食技術コンサルタント」の企画にあたって Zairyo-to-Kankyo Vol.57(2008), No.10
    3. Importance of Corrosion Prevention Technologies to Material Circulation Society Zairyo-to-Kankyo Vol.55(2006), No.4
  • Electrochemical Measurements by the External Pressure Balanced Reference Electrode System and the Evaluation of Thermal Diffusion Potential in High Temperature and High Pressure Aqueous Solutions

    pp. 70-75

    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.56.70

    The External Pressure Balanced Reference Electrode (EPBRE) system was applied to the electrochemical measurements in high temperature and high pressure aqueous solutions. Irreversible potentials arisen in the EPBRE system, such as liquid junction potential and thermal junction potentials were studied with comparison to the internal reference electrode system in 0.1 M KCl solutions at high temperatures. It was demonstrated that the potential measured by EPBRE system can be converted to the potentials referenced to standard hydrogen electrode potential at high temperature and also at 25ºC. The contribution of liquid junction potential and thermal diffusion potentials to the measured values was also evaluated in the EPBRE system.

Article Access Ranking

20 Sep. (Last 30 Days)

  1. Formation and Evolution of Inclusions in High Chromium Steel ISIJ International Vol.61(2021), No.9
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Effect of Heating Rate on Carbothermic Reduction and Melting Behavior of Iron Ore-Coal Composite Pellets ISIJ International Advance Publication
  4. Preface to the Special Issue on “Recent Progress in Inclusion/ Precipitate Engineering” ISIJ International Vol.61(2021), No.9
  5. Evaluation of Interfacial Energy between Molten Fe and Fe-18%Cr-9%Ni Alloy and Non-Metallic Inclusion-Type Oxides ISIJ International Vol.61(2021), No.9
  6. Production and Technology of Iron and Steel in Japan during 2020 ISIJ International Vol.61(2021), No.6
  7. Modeling of Wall Shear Stress Induced Inclusion Transport and Removal in Multi-Strand Tundish ISIJ International Vol.61(2021), No.9
  8. Three-dimensional Quantitative Evaluation of the Lamellar Curvature in Pearlitic Steel Based on an Orientation Analysis of Cementite ISIJ International Advance Publication
  9. Analysis of Air-Mist Cooling Effect for Coil in the Electromagnetic Induction Controlled Automated Steel Teeming System ISIJ International Vol.61(2021), No.9
  10. Simultaneous Analysis of Soluble and Insoluble Oxygen Contents in Steel Specimens Using Inert Gas Fusion Infrared Absorptiometry ISIJ International Vol.61(2021), No.9

Search Phrase Ranking

20 Sep. (Last 30 Days)

  1. blast furnace
  2. inconel 600
  3. blast furnace productivity
  4. miyamoto goro
  5. nozzle clogging
  6. b2o3 mold flux
  7. blue carbon
  8. investigation of arc behavior and temperature distribution corresponding to electrode and phase configurations in a multiphase ac arc
  9. ohno
  10. sei kimura