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. 53 (2004), No. 9

  • Electrochemical Corrosion Control Method for Concrete Structure

    Koji Kawamata

    pp. 426-430

    Bookmark

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

    Log in / Sign Up

    Abstract

    This paper explains the electrochemical corrosion control method. This method is an improvement technology for durability of concrete structure, and attracts attention in recent years. The electrochemical corrosion control method is classified into 4 methods, such as cathodic protection method, desalination method, re-alkalization method and electrodeposition method. This paper also shows the principle of these methods, the sphere of applications and construction illustrations.

  • Effects of Bicarbonate Ion and Silica on Anodic Polarization Curve of Carbon Steel

    Masayuki Itagaki, Yoshinobu Yamada, Kunihiro Watanabe, Takahiro Nukaga, Fumio Umemura

    pp. 434-439

    Bookmark

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

    Log in / Sign Up

    Abstract

    The anodic reactions of carbon steel in fresh water containing bicarbonate ions or silica were investigated by the measurements of polarization curves, the surface observation and element analysis of the surface. The polarization curves of the carbon steel in the solution with low conductivity were determined by the iR compensation, where the solution resistance was obtained by using in-situ electrochemical impedance spectroscopy. The stable passive film was formed on the carbon steel surface in the solution containing 100ppm bicarbonate ions. On the other hand, though the passive film was formed on carbon steel surface in the solution containing silica, the pitting occurred during the measurement of polarization curve. The observation by laser microscope indicated that the pits were covered with the mound. The element analyses by Glow Discharge Optical Emission Spectroscopy (GD-OES) gave that the passive film and the rust, which were formed on the carbon steel in the solution containing silica, involved a large amount of Si.

  • Is the Damage to Pure Copper Piping an Erosion-Corrosion in Nature?

    Moritoshi Murakami, Akihiro Yabuki, Masanobu Matsumura

    pp. 440-445

    Bookmark

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

    Log in / Sign Up

    Abstract

    Wall thinning to the inside surfaces of T's, elbows and straight tubes which were located at just downstream of elbows occurred, when a 1% CuCl2 (II) solution was allowed to flow through a pure copper piping with a nominal dimension of 15A at the flow velocity of 1-2m/s. Flow velocity difference corrosion was presumed to be the cause of the damage, since it occurred at the surface of inner curvature of the elbow where the flow velocity was lower than that at the outer curvature. This assumption was proved to be valid, as evidenced by measurement of the macro cell current which was directed from the higher flow velocity area to the lower velocity area, as well by the polarization behavior of these areas. Based on the corrosion mechanism, preventative action was taken, resulting in a reduction in wall thinning of the inner curvature surface of the elbow down to the level of that at outer curvature surface of higher velocity area. Finally, the issue of how closely the 1% CuCl2 accelerating test solution simulated the corrosion of pure copper piping in a system that carries brine or tap water was discussed.

  • Delayed Fracture Susceptibility of Meta-stable Austenitic Stainless Steel ID Blade

    Hideo Cho, Yuichi Haketa, Ryuji Ikeda, Mikio Takemoto

    pp. 446-450

    Bookmark

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

    Log in / Sign Up

    Abstract

    ID blade of meta-stable austenitic stainless steel shows an elastic anisotropy and potential susceptibility to delayed fracture due to the strain-induced martensite. Authors first estimated the five elastic stiffness coefficients of the ID blade from the orientation dependency of the laser-excited Lamb waves. Rayleigh wave velocity decreased with a maximum difference of 400m/s with angles from the rolling direction, while the sheet velocity varied with a maximum increase of 500m/s. Hydrogen pre-charged ID blade showed the wave velocities higher than that of the as-received one. Fracture strength of hydrogen pre-charged ID blade decreased to 43% and 73% of those of the as-received one in the rolling and transverse direction, respectively. The blade suffered brittle fracture after 4.17ks hydrogen charging at the radial fastening stress level. Both the acoustic emission source location and fractographic observation suggested the delayed fracture assisted by the strain-induced martensite.

  • Influence of HCl in the Atmosphere on Hot Corrosion of Ni-Cr-Mo Alloy under a Coating of Molten NaCl-KCl-Na2SO4

    Yasuhiro Oshima, Michihisa Fukumoto, Yoshiyuki Sato, Motoi Hara

    pp. 451-458

    Bookmark

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

    Log in / Sign Up

    Abstract

    Hot corrosion behavior of Ni-10mass%Cr alloys having several Mo content under a molten NaCl-KCl-Na2SO4 mixture in 75vol%O2-N2 atmosphere containing 0.1vol%HCl was examined by thermogravimetry, chemical analyses of scale formed on the alloys and electrochemical technique. Especially, the effect of Mo addition and the influence of HCl in atmosphere on the hot corrosion behavior were considered.
    In the atmosphere with HCl, corrosion resistance of the Ni-Cr-Mo alloy increased with an increase in the amount of Mo in the alloy. In this case, it was found that a protective Cr2O3 layer was formed as an inner scale on the alloy. The analyses of the scale formed in the initial stage showed that for Ni-Cr-Mo alloy exposed at the gas mixture with HCl, in the initial stage less than 6ks, MoO2 was formed at the scale/alloy interface, followed by a growth of Cr2O3 layer. The electrochemical measurement showed that the anodic current with increasing polarization potential measured in the atmosphere containing HCl rose less than that in the atmosphere without HCl. Moreover, the inhibition of the rise in the anodic current was also observed when H2O vapor was introduced into the atmosphere. Consequently, the mechanism, that the protective Cr2O3 layer was formed by the anodic oxidation reaction of the alloy with H2O vapor produced by the reaction of HCl and O2- in the molten salt, was proposed.
  • © 2004 Japan Society of Corrosion Engineering

Article Access Ranking

01 Aug. (Last 30 Days)

  1. Production and Technology of Iron and Steel in Japan during 2020 ISIJ International Vol.61(2021), No.6
  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 Ore Type and Gangue Content on Carburization and Melting Behavior of Carbon-Iron Ore Composite ISIJ International Vol.61(2021), No.6
  4. Viscosity of Na–Si–O–N–F Melts: Mixing Effect of Oxygen, Nitrogen, and Fluorine ISIJ International Vol.60(2020), No.12
  5. Comprehensive Research about Critical Interaction Region Named Cohesive Zone in Series of Dissected Blast Furnaces ISIJ International Vol.61(2021), No.6
  6. Behavior of Jet from Nozzle Set on Side Wall of Lance ISIJ International Vol.61(2021), No.6
  7. Method for Simulating Gas Permeability of a Coke Bed Including Fines Based on 3D Imaging on the Coke Particle Morphology ISIJ International Vol.61(2021), No.6
  8. Carbon Enrichment of Austenite during Ferrite-bainite Transformation in Low-alloy-steel Tetsu-to-Hagané Advance Publication
  9. Formation and Evolution of Inclusions in High Chromium Steel ISIJ International Advance Publication
  10. Effect of Impeller and Gas Stirring on Agglomeration Behavior of Polydisperse Fine Particles in Liquid ISIJ International Vol.61(2021), No.6

Search Phrase Ranking

01 Aug. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. nozzle clogging
  4. 34crmo4 pressure vessel
  5. high hole expansion ratio
  6. 34crmo4
  7. blast furnace permeability
  8. carburization
  9. frp cylinder using cr−mo steel liner for storing high pressure hydrogen gas
  10. gas carburization