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. 70 (2021), No. 4

  • Greeting from New President

    pp. 101-102

    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.70.101

    x

    Readers Who Read This Article Also Read

    1. Kinetics on Formation, Growth and Removal of Alumina Inclusions in Molten Steel Tetsu-to-Hagané Vol.107(2021), No.10
  • Research on Test Methods of Promote Local Corrosion (Pitting Corrosion)

    pp. 117-121

    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.70.117

    An accelerated corrosion test method was investigated in order to estimate the service life of coated steel. This test focused on the reduction of the thickness of steel material by reproducing the local corrosion represented by pitting. We investigated the conditions that would quickly cause heavy pitting corrosion by changing the temperature, the concentration of NaCl and the wetting and drying of the steel surface. It was found that pitting corrosion can be reproduced quickly by repeating a wet/dry cycle and locally concentrating an appropriate quantity of NaCl during the test.
  • Corrosion Behavior of Carbon Steel in the Sulfate Solutions with Mg2+

    pp. 122-125

    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.70.122

    The corrosion behavior of carbon steel in the sulfate solutions with Mg2+ was investigated using cyclic corrosion tests and cyclic voltammetry. In the cyclic corrosion tests, the addition of Mg2+ tended to suppress corrosion of carbon steel and formed sulfur-concentrated layers between steel and rust. The results of cyclic voltammetry showed that cathode peak appeared as the number of cycles increased in the sulfate solution with Mg2+. These results suggest that the addition of Mg2+ in the sulfate solution accelerates reduction of rust and formation of sulfur-concentrated layers, and these layers suppress corrosion reactions.
  • Pot-shaped Pitting Corrosion of SUS304 Welded Coupon Immersed in Natural Seawater and Microorganism Analysis

    pp. 126-130

    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.70.126

    Pot-shaped pitting corrosion occurred in SUS304 coupon with intact weld part immersed in natural seawater for 10 months. Removal of scale and roughness on weld part prevented severe corrosion for 10 months. Hypothetical corrosion progress mechanism by cooperative effect of iron oxidizing bacteria, Leptothrix sp., which might oxidize Fe2+ to Fe3+ and iron reducing bacteria, Shewanella sp., which might reduce Fe3+ to Fe2+ using electron directly obtained from metal by extracellular electron transfer (EET) was proposed.
  • Consideration of Repassivation Process Based on the Measurement pH in Crevice and Metal Dissolution Rate of SUS304 Stainless Steel in Artificial Seawater

    pp. 131-139

    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.70.131

    The crevice corrosion test by two-step potentiostatic polarization and the pH in crevice (pHc) with a semiconductor chemical sensor were simultaneously measured, and the repassivation mechanism for SUS304 stainless steel were investigated.The total metal dissolution current density (imetal) of crevice corrosion is shown as the sum of the current density detected externally (iout) and inner crevice corrosion caused by hydrogen generation reaction(iin). When crevice corrosion has progressed sufficiently, there is nice correlation between iout and pHc. If there is a lot of iin, the consumption of H+ will increase and it will be easier to repassivate. The repassivation pH was 2.5 to 3.0 in both ASW and 1/10ASW. Current density threshold (10-5 A・cm-2) and relationship between pHc and potential the immobilization potential (ER) obtained from was was 80 mV(SHE) in ASW and 120 mV(SHE) in 1/10ASW, the lower Cl concentration in the external environment, ER became noble. This is because the ratio of iin in imetal is high, the consumption of H+ increases, and the effect of diffusion and dilution of anolyte makes it easy to repassivation.

Article Access Ranking

06 Dec. (Last 30 Days)

  1. Heat conduction through different slag layers in mold. Thermal conductivity measurement of commercial mold fluxes ISIJ International Advance Publication
  2. Deformation of Non-metallic Inclusions in Steel during Rolling Process: A Review ISIJ International Vol.62(2022), No.11
  3. Activity of Chromium Oxide in Calcium Silicate Bearing Molten Slag for Highly Clean Chromium Steel Refining Process ISIJ International Advance Publication
  4. Effects of basicity and Al2O3 content on the crystal structure of silico-ferrite of calcium and aluminum ISIJ International Advance Publication
  5. Behavior and kinetic mechanism analysis of dissolution of iron ore particles in HIsmelt process based on high-temperature confocal microscopy ISIJ International Advance Publication
  6. Corrections of the figure in the paper “Effect of Cerium and Magnesium Addition on Evolution and Particle Size of Inclusions in Al-killed Molten Steel” [ISIJ International, Vol. 62 (2022), No. 9, pp. 1852-1861] ISIJ International Vol.62(2022), No.11
  7. A shallow neural network for recognition of strip steel surface defects based on attention mechanism ISIJ International Advance Publication
  8. Characterization and Control of Secondary Phase Precipitation of Nb–V–Ti Microalloyed Steel during Continuous Casting Process ISIJ International Vol.62(2022), No.11
  9. Precipitation Behavior of Magnetite Phase during Modified Nickel Slag Treated by Molten Oxidation ISIJ International Advance Publication
  10. Improvement of Sinter Productivity and Qualities by Placing Low Slag Green Pellet at Lower Layer of Sinter Packed Bed ISIJ International Vol.62(2022), No.11

Search Phrase Ranking

06 Dec. (Last 30 Days)

  1. blast furnace
  2. converter slag
  3. si-killed spring steel
  4. 高温変形抵抗
  5. 5%nickel
  6. 钢渣脱磷
  7. coatings hot formed steel
  8. free lime
  9. secondary cooling billet
  10. steel