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. 54 (2005), No. 1

  • Current Status and Future of Studies on Corrosion of Carbon Steel in the Presence of Magnetite

    pp. 2-8

    Bookmark

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

    Log in / Sign Up
    It is essentially necessary to understand the effect of corrosion products on the corrosion rate of carbon steel in order to evaluate the lifetime of carbon steel overpack. Especially, effect of magnetite on the long term integrity of overpack is one of the important subjects to be solved, because some experimental results showed that the magnetite layer formed on a carbon steel overpack as a corrosion product would accelerates the corrosion rate of the overpack. Various studies have been conducted on the corrosion mechanism of carbon steel in the presence of magnetite, its effect on the overpack lifetime and the countermeasures against the corrosion acceleration. At present, however, the interpretations on the results of these studies are not always consistent each other. In this report, the current status of the studies on corrosion of carbon steel in the presence of magnetite was reviewed, and the unsolved problems and future research subjects were extracted and discussed.
    x

    Readers Who Read This Article Also Read

    1. Diffusion Behavior of D2O in Fe3O4 Film on Fe Formed in an NaOH Solution containing Oxidants Zairyo-to-Kankyo Vol.67(2018), No.9
  • Scientific Conversation on ‘Microbiologically influenced Corrosion’ at a Research Laboratory in a Stainless Steel Maker

    pp. 9-12

    Bookmark

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

    Log in / Sign Up
  • Pitting Corrosion and Its Prevention of Copper Heat Exchanger Tubes for Water Heater

    pp. 20-24

    Bookmark

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

    Log in / Sign Up
    Copper heat exchanger tubes in water heater have been similarly suffering from type I' pitting corrosion, which have been experienced in the pass-through soft copper plumbing tubes, under well water. Through the case examination, the result showed that type I' pitting corrosion only appears on water inlet pipes and coiled pipes under conditions of maintained cold water as well as residual carbon over 5mg/m2.
    To solve this problem, the performance of 3 type heat exchangers was investigated by field test under well water. The heat exchanger with copper tubes treated by tin coating after manufacturing showed the most excellent resistance against pitting corrosion due to the stable tin oxide formation on the tin coating surface, followed by the heat exchanger made of copper tube with residual free carbon below 4mg/m2 which also showed excellent pitting corrosion resistance. However the heat exchanger with manufactured Cu-0.24 mass%Sn alloy tube corroded in either case: with or without carbon film. Consequently, it can be stated that residual free carbon has certain relevance to copper, as so for Sn concentration to Cu-Sn alloy concerning the occurrence of pitting corrosion.
  • SCC Susceptibility of High Corrosion Resistant Stainless Steels for Spent Fuel Storage Canister Materials Exposed at Hot Wet Air with Dripped Synthetic Sea Salt

    pp. 25-30

    Bookmark

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

    Log in / Sign Up
    A canister for a concrete cask in the spent fuel facilities will be exposed at the wet environment with deposited sea salt particles after long term storage periods. High corrosion resistant stainless steels, dual phase stainless steel (material D) and austenitic super stainless steel (material A), were selected for candidate materials of the canister, for the wide and 20 to 50mm thick hot rolled plates are able to produce from those alloys by the recent hot rolling technology. Then constant load stress corrosion cracking tests for both materials were conducted by Mayuzumi et al. for up to 16000 hours in the hot wet environments to confirm no failure in this period, however several penetrations are observed on the both surfaces of specimens. In order to evaluate the corrosion resistance of those materials, the penetrations of above mentioned specimens which authors were given from them are examined to obtain the base data of stress corrosion crack initiation and propagation. The following conclusions were obtained.
    1) The micro stress corrosion cracks are observed only at the 80°C test specimens, although only penetrations were observed on the specimens tested at 70°C and 80°C. Crack initiates at the stress of larger than 1.1σy after approximately 15000 hours of test for material D, and at the stress 1.5σy and after approximately 1000 hours for material A.
    2) SCC propagation rates of both materials are very slow.
    3) The critical value of SCC initiation (KI SCC) are about 7MPa√m for material D and 5MPa√m for material A, respectively, in this investigation.
  • Efficient Sampling Method for Evaluating Atmospheric Corrosivity Using Sputter-Cleaned Metal Surface

    pp. 31-34

    Bookmark

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

    Log in / Sign Up
    We proposed a new efficient sampling method for evaluating atmospheric corrosivity influenced by airborne sea salt and/or pollutants. X-ray Photoelectron Spectroscopy (XPS) was employed to analyze chlorine and sulfur captured in the top most thin layer of corrosion films. These elements are the main components of airborne sea-salt-particles and/or pollutants, both of which promote corrosion. Copper and silver specimens with super-clean surfaces pretreated by Ar+-ion sputtering were exposed to three different atmospheres for a period of 1 hour, before and after which they were preserved in a vacuum carrying vessel. XPS was sensitive enough to detect minute amounts of the target elements, which well reflect the atmospheric corrosivity, at the early stages of corrosion. This demonstrates that this method is useful for quick evaluation of atmospheric corrosivity.

Article Access Ranking

01 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. Dissolution of Chromium from Steelmaking Slag–Cr-containing Mineral Phases and Synthetic Slags– Tetsu-to-Hagané Vol.108(2022), No.11
  8. Effect of Molten Steel Composition on Inclusion Modification by Calcium Treatment in Al-Killed Tinplate Steel ISIJ International Advance Publication
  9. Characterization and Control of Secondary Phase Precipitation of Nb–V–Ti Microalloyed Steel during Continuous Casting Process ISIJ International Vol.62(2022), No.11
  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

01 Dec. (Last 30 Days)

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