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. 55 (2006), No. 11

  • Collaboration between Universities and Industries

    pp. 475-475

    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.55.475

  • High Temperature Oxidation Resistant Coatings

    pp. 476-482

    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.55.476

    Recent requirement for increasing operation temperatures in energy conversion system has let to an increase in the demand for improving materials at higher temperatures. Coating is one method used to meet these demands by retaining substrate mechanical properties and giving improved high temperature oxidation and corrosion resistance.
    This review introduces some recent results we obtained, and concepts for next generation coatings are discussed.
  • The Corrosion Rate and the Hydrogen Absorption Behavior of Titanium under Anaerobic Condition

    pp. 485-494

    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.55.485

    Titanium is one of the candidate materials for overpacks as a high corrosion resistance metal. Hydrogen embrittlement is a main cause of the damage of long term integrity of titanium overpack. It is not well known about the corrosion resistance and hydrogen absorption behavior of titanium under anaerobic condition. In this study, the completely sealed ampoule test and the immersion test of titanium was carried out in aqueous solution and bentonite in order to obtain reliable data about the hydrogen generation rate and the ratio of hydrogen absorption in titanium. As the results of the tests with changing the environmental factors, obvious higher corrosion rates were observed at high carbonate (1 M) and high pH (pH 13) conditions due to the increase in the anodic reaction rate. In other conditions, corrosion rate of titanium were estimated to be in the order of 10-3∼10-2 μm/y. Almost all (<98%) of the hydrogen generated by corrosion was absorbed into titanium. Assuming that the time evolution of the hydrogen content in titanium follows linear law to make conservative assessment, the absorbed hydrogen content was estimated to be of 400∼500 ppm in 1000 years.
  • Crevice Corrosion of 13Cr Component in Humid Atmosphere around Operating Water Jet Loom

    pp. 495-504

    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.55.495

    Crevice corrosion damages of a flat heald, 13Cr stainless steel components used for water jet room (WJL), was investigated in this paper. The healds had been operating in highly humid atmosphere of sprayed tap water, bearing heavy deposits composed of PAAE resin on their surface. Conventional group of heald (heald C) has used to serve for about two years, while a newly group of heald (heald X) suffered significant localized corrosion earlier in one or two months. Determined repassivation potential for crevice corrosion, ER,CREV, was expressed as
    ER,CREV(mV vs. SHE)=-294 log[Cl-](mg/L)+832 (1)
    in the Cl- concentration, [Cl-], from 20 to 1000 mg/L for metal/metal-crevice of the healds X and C at 30°C. ER,CREV for metal/deposit-crevice was confirmed at 16 mg/L Cl- to be close to the equation (1). Residual chlorine (R-Cl) concentration in the tap water increased as high as 0.4 mg/L, when spontaneous electrode potential, ESP, for the heald X might be believed to reach 570 mV vs. SHE (ESP,X). Based on comparison of ER,CREV as equation (1) with ESP,X crevice corrosion can be expected to occur above 8 mg/L Cl-. Conclusively, Cl- concentration of 14 mg/L in the tap water in summer could explain real crevice corrosion for the heald X. More ennoblement in ESP for the heald X than the heald C could be attributed to larger amount of precipitated Cr-carbide. To effectively prevent the crevice corrosion, R-Cl concentration in the tap water to be used for WJL should be kept below 0.04 mg/L.
    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
  • Effects of Debris and Residual Carbon Film in Circulated Water Containing a Corrosion Inhibiter on Pitting Attack of Copper Tubes for Air Conditioning System

    pp. 505-510

    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.55.505

    Electrochemical measurements and surface observations have been made to clarify the effects of debris and residual carbon film in circulated water on corrosion behavior of copper tube for air conditioning system. Proper usage of water treatment agent has kept tube surface corrosion-resistant, regardless of surface with or without residual carbon film. It is electrochemically and morphologically indicated that debris such as corrosion product in circulated water causes damages of the tube surface and then leads to occurrence of localized corrosion such as pitting attacks in some situations.

Article Access Ranking

07 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. Precipitation Behavior of Magnetite Phase during Modified Nickel Slag Treated by Molten Oxidation ISIJ International Advance Publication
  8. A shallow neural network for recognition of strip steel surface defects based on attention mechanism 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

07 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