Steel Science Portal

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. 64 (2015), No. 12

  • Changeable Research, Education and Activity of Society

    Kenichi Takai

    pp. 517-518

    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.64.517

  • Statistical Analysis and Its Application to Actual Maintenance in Chemical Plant

    Tomoyuki Kurihara

    pp. 519-524

    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.64.519

    Abstract

    The collection of the actual damage data and statistical analysis are introduced by some case studies in order to apply them to the practical maintenance in chemical plant. In the case of the radiation tube with oxidation, the inspection data were grouped by the actual damaged condition and the life prediction by the statistical analysis was conducted. From the result, the replace plan was clarified.
    In two case studies on external corrosion, the corrosion data and associated information were collected from the actual plant and statistical analysis was conducted. From the result, the acceleration factors of the external corrosion were quantitatively clarified by the distribution of the corrosion rate. Based on the results, the technical module was developed. And in actual plant, the inspection was planned and carried out.
    From these case studies, it is recognized that understanding the characteristics of the degradation is important for the statistical analysis of damage data.

  • Carbon Steel Corrosion Induced by Microbial Community in Soil Environment and Its Analysis

    Shin-ichi Hirano, Toru Nagaoka, Kotaro Ise, Yuki Amano, Norio Matsumoto

    pp. 535-539

    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.64.535

    Abstract

    To obtain the knowledge about the corrosion ability and its mechanism as a target the soil environment microorganisms, lake mud was cultured with metallic iron. As a result, corrosion of carbon steel was observed with sulfate reduction and methane producing activity in brackish medium with lactate as substrate. The next-generation sequencing technologies revealed microbial community varies greatly between environmental samples (inoculated sample) and cultured sample. Particularly, Desulfovibrio species and Clostridia class, that sulfate reducing ability have been reported, became dominant. Inhibition test of sulfate reducing bacteria and methane producing archaea suggested that sulfate reducing bacteria plays a major role for this corrosion, and methane producing archaea enhanced corrosion activity by the coexistence of sulfate reducing bacteria.

  • Corrosion Test Using Bottom Water from Oil-storage Tank and Microbial Community Analysis by Next Generation Sequencer

    Satoshi Wakai, Sotaro Fujii, Misa Masanari, Kazuhiko Miyanaga, Yasunori Tanji, Yoshihiro Sambongi

    pp. 540-544

    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.64.540

    Abstract

    Involvement of microorganisms to corrosion refers to microbiological influenced corrosion（ MIC）. We have previously succeeded a lab-scale corrosion test using bottom water from oil-storage tanks and shown microbial community change after the corrosion by a denaturing gradient gel electrophoresis analysis. However, those community structures have not yet been correlated to the accelerated corrosion. Therefore, we further conducted analysis of microbial community for by pyrosequencing using a next-generation sequencer. In the corrosion sample, an acetic acid bacterium Acetobacterium sp. and a sulfate-reducing bacterium Desulfovibrio sp. were enriched. In contrast, only Desulfovibrio sp. bacterium was enriched in the non-corroded culture, and Acetobacterium sp. bacterium was not observed. These results indicate that the Acetobacterium sp. bacterium may involve in the accelerated corrosion. This is first report of the corrosion by the Acetobacterium sp. bacterium. The combination of a lab-scale corrosion test and microbial community analysis by pyrosequencing would be useful to correlate between corrosion behavior and microbial community change. In future, such investigation would contribute to the understanding for the microbiologically influenced corrosion.

  • Protection of Iron against Corrosion in Various Solutions by Coverage of Passivated Iron with a Two-Dimensional Polymer Coating Prepared by Using Octyltriethoxysilane and Healing Treatment in 0.1 M NaNO3

    Tadashi Shimura, Kunitsugu Aramaki

    pp. 545-551

    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.64.545

    Abstract

    In order to shorten the time required for preparation of an ultrathin polymer coating on a passivated Fe electrode, a self-assembled monolayer of 16-hydroxyhexadecanoate ion HO(CH2)15CO2－ adsorbed on the electrode was modified with 1,2-bi(striethoxysilyl)ethane(C2H5O)3Si(CH2)2Si(OC2H5)3 and octyltriethoxysilane C8H17Si(OC2H5)3. Further, the passivated and polymer-coated electrode was healed by treatment in 0.1 M NaNO3. The time for passive film breakdown, tbd and the protective efficiency, P (%) were determined by monitoring the open-circuit potential and repeated polarization measurements during immersion in 0.1 M KClO4, 0.1 M NaNO3, 0.1 M Na2SO4 and 0.1 M NaCl for many hours. The tbd values were 57.4, >240, 19.2 and 9.0 h, respectively. Breakdown of the passive film was markedly suppressed by coverage with the polymer coating and healing treatment. The P values of the electrode in these solutions were extremely high, more than 99.9% before tbd, indicating that complete protection of substrate Fe against corrosion was accomplished by covering the electrode with the healed passive film and polymer coating unless the passive film was broken down.

  • Microelectrochemistry at Heat-tinted Zone of Stainless Steel Weldment

    Takashi Kawano, Tomohiro Ishii, Hiroshi Kajiyama, Mitsuo Kimura, Koji Fushimi

    pp. 552-557

    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.64.552

    Abstract

    Deterioration mechanism of corrosion resistance at heat-tinted zone of stainless steel weldment was studied. Local electrochemical measurements with micro capillary cell and surface analyses at small regions were conducted to correlate local variation in corrosion behavior and surface structure. Depletion of the Cr content at the substrate surface and formation of an Fe rich oxide layer on the surface were confirmed, although their distances from the welding bead were not identical. It was also revealed that the corrosion behaviors at the area with the Cr depletion and the area with the Fe rich oxide layer were different. The Cr depletion led to lowering of pitting potential due to the activation of substrate steel whereas the Fe rich oxide layer led to preferential rusting in the cyclic corrosion test due to deterioration of the surface protective layer.
  • © 2015 Japan Society of Corrosion Engineering

Article Access Ranking

24 Mar. (Last 30 Days)

  1. Dependence of Carbon Concentration and Alloying Elements on the Stability of Iron Carbides ISIJ International Advance Publication
  2. Comprehensive Optimization Control Technology of Rolling Energy and Oil Consumption in Double Cold Rolling ISIJ International Advance Publication
  3. Experiments on Removal of Hydrophilic Fine Particles in Bubbly Flow ISIJ International Vol.59(2019), No.2
  4. Effects of Impurities and Processing Conditions in Al–1%Mn Alloys on the Formation of Thermally Stabilized Substructures MATERIALS TRANSACTIONS Vol.59(2018), No.11
  5. Temperature Field Distribution of a Dissected Blast Furnace ISIJ International Advance Publication
  6. Coating Film Profiles Generated by Fluctuating Location of the Wiping Pressure and Shear Stress ISIJ International Vol.59(2019), No.2
  7. Effect of EAF Slag Temperature and Composition on its Electrical Conductivity ISIJ International Vol.59(2019), No.2
  8. Fundamentals of Silico-Ferrite of Calcium and Aluminium (SFCA) Iron Ore Sinter Bonding Phase Formation: Effects of Basicity and Magnesium on Crystallisation during Cooling ISIJ International Vol.59(2019), No.2
  9. Evolution of Blast Furnace Process toward Reductant Flexibility and Carbon Dioxide Mitigation in Steel Works ISIJ International Vol.56(2016), No.10
  10. Structure Based Viscosity Model for Aluminosilicate Slag ISIJ International Advance Publication

Search Phrase Ranking

24 Mar. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. blast furnace productivity
  4. galvanizing
  5. tuyere abrasion
  6. tuyere erosion
  7. tuyere failure
  8. lme
  9. wear on tuyere
  10. 鉄と鋼