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. 58 (2009), No. 12

  • Thinking in the Global View Point

    pp. 401-401

    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.58.401

  • Effect of Initial Films of Copper on Moundless Type Pitting Corrosion of Copper Tubes

    pp. 434-440

    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.58.434

    Copper tubes were immersed for one year in fifteen kinds of synthetic freshwater to reproduce a moundless type pitting corrosion. Most or part of the area of some specimen surfaces changed its color into dark brown for about one week immersion. Such a dark brown area formed in freshwater for about one week immersion is called “initial film” of a copper. The formation of the initial film was accelerated in the test water containing a chloride ion. After one-year immersion tests, moundless type pitting corrosion occurred on the specimen immersed in the test water containing 40 mg SiO2/L, 50 mg SO42−/L, 10 mg Cl/L and 10 mg HCO3/L. These pits were located on the boundary of the initial film. The initial film was formed intentionally by one-week immersion in the solution containing silica and chloride ion. Cathodic reductions of the initial film revealed that the thickness of the initial film was about 400 nm of cuprous oxide. The galvanic corrosion test was performed using galvanic couples of a copper tube with the initial film and an as-received copper tube. The galvanic current flew from the copper tube with initial film to the as-received copper tube. This result indicates that the macro-cell formation of the area with an initial film and the area without an initial film causes the moundless type pits on the boundary of the initial film.
  • Development of a New Design for Corrosion Prevention in NH4HS Environments

    pp. 441-447

    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.58.441

    NH4HS corrosion has been a serious problem in oil refining plants. The corrosion rate dramatically increases over a certain concentration of NH4HS. In high pressure plants such as hydrodesulfurization units which are operating in NH4HS environments, leakage caused by corrosion could result in catastrophic disaster. Therefore, in the design phase, corrosion prevention techniques should be considered. In this study, a new design philosophy to prevent NH4HS corrosion in a sour water environment was successfully developed based on simulation techniques.

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