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. 41 (1992), No. 6

  • High Temperature Oxidation of a Series of Nickel-Base Superalloys on a Single Tye-Line and its Extension

    pp. 379-384

    Bookmark

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

    Log in / Sign Up
    An investigation was carried out on variation of oxidation behavior to be seen when the alloy compositions shift along a single tie line. The specimens were prepared from the alloys whose composition lay on the tie line of Rene-95 at 760°C or its extension. Oxidation was performed in oxygen at 1000, 1100 and 1200°C. A parabolic law was held for every alloy at 1200°C. A logarithmic law was held for every alloy but one at 1000°C. At 1100°C the behavior was parabolic for the alloys near to the γ-region and logarithmic for the alloys in or near to the γ'-region. The behavior of the intermediate region was near-parabolic in the first half, while it was near-logarithmic in the second. The reactivity generally decreased monotonously towards the γ'-region at all temperatures. The reactivity was, however, higher than the general trend for the alloys which were composed of two phases at the oxidation temperature as well as for the alloys within the γ'-phase region when the oxidation temperature was 1200°C.
  • Corrosion of TiN Coating in High-Temperature Demineralized Water

    pp. 385-392

    Bookmark

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

    Log in / Sign Up
    Corrosion behavior of TiN film coated by an arc ion plating on type 304 stainless steel in demineralized water at 286°C was studied using the circulating type experimental loop. Exposure tests were carried out under three different dissolved O2 concentratins of less than 10μg/l, 150μg/l and 1, 000μg/l, respectively. Corroded surface was observed by EPMA, XRD and XPS. On the exposed specimen surface, the corrosion film composed of TiO2 was formed, which increased the weight of specimen after exposure. This weight gain varied largely by dissolved O2 concentration and it increased by several times with an increase of dissolved O2 concentration. It was assumed from the relationship between dissolved O2 concentration and the corrosion rate of TiN that TiN could react with both H2O and O2, although the dissolved O2 became a dominant factor for corrosion increase at concentrations over several 10μgs/l.
  • Specific Surface Area and Pore Size Distribution of Rusted Steel after Chemical Conversion in a 0.1M Na2MoO4-H3PO4 Aqueous Solution

    pp. 393-398

    Bookmark

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

    Log in / Sign Up
    All specimens as rusted, phosphated, and chemically treated with a 0.1M Na2MoO4-H3PO4 solution after wire-brush scratching were found to have the same BET type of adsorption isotherm by N2 adsorption. Their pore size distribution peaked at about 100nm radius, and then decreased abruptly until 500nm and thereafter slowly until 1500nm. The chemically treated wire-brush scratched rusted steel was small in specific surface area and in all pore volumes as compared with other specimens probably due to the formation of conversion coatings at exposed bare areas which have existed on the rusted surface or been caused by wire-brush scratching. It seems that sludges were adsorbed at these bare areas and caused pores to be partly clogged.
  • Evaluation of Biomedical Stainless Steels by Fretting Corrosion Test

    pp. 399-405

    Bookmark

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

    Log in / Sign Up
    A fretting corrosion testing apparatus was constructed in order to simulate the corrosion damages of biomedical materials in human body. By means of this testing apparatus and electrochemical approach, the fretting corrosion test of 316L stainless steel was performed to establish the in vitro test condition, and to obtain the useful information for the improvement of biomedical stainless steels. In continuous fretting corrosion test of 316L stainless steel, it was found that fretting enhanced crevice corrosion did not occur even when specimen was potential-controlled above 0mV (SCE) where growth of crevice corrosion is more susceptible. However, during the intermittent fretting corrosion test, growth of crevice corrosion occurred remarkably at the resting stage, and the anodic current corresponding to the release of metal ions, was one order of magnitude higher than that at the fretting stage. Therefore, it was recommended that intermittent fretting corrosion test is more significant for the evaluation of stainless steels. The application of high Mo modified stainless steel is very effective to suppress such crevice corrosion at resting stage.
  • Approach to Surface Analyses (III)

    pp. 406-414

    Bookmark

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

    Log in / Sign Up
  • Micromachines Fabricated by IC-compatible Processes

    pp. 415-422

    Bookmark

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

    Log in / Sign Up
    Micromachines are invisibly small and yet composed of many complicated elements. Among many studies of micromachines, mechanisms and actuators of μm in size are reviewed with their fabrication processes which are compatible with IC technology. The processes, called micromachining, can solve problems which have prohibited conventional mechanical machining from making such small machines. Micromachines will be equipped with sensors, actuators, and electronics. Although sensors and electronics are well developed, the study of microactuators have just been started. Recent topics in microactuators and their applications in surface science are discussed.
  • An Expected Pitting Corrosion of Type 304 Oil Cooler in Fresh Water

    pp. 423-424

    Bookmark

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

    Log in / Sign Up

Article Access Ranking

22 Sep. (Last 30 Days)

  1. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  2. Recent Progress of Instrumentation Technology for Process Automation in Steel Industry Tetsu-to-Hagané Vol.106(2020), No.9
  3. Accuracy Improvement of the XRD-Rietveld Method for the Quantification of Crystalline Phases in Iron Sintered Ores through the Correction of Micro-absorption Effects ISIJ International Advance Publication
  4. Melting Erosion Failure Mechanism of Tuyere in Blast Furnace ISIJ International Advance Publication
  5. An Empirical Comparative Study of Renewable Biochar and Fossil Carbon as Carburizer in Steelmaking ISIJ International Advance Publication
  6. Review on the High-Temperature Thermophysical Properties of Continuous Casting Mold Fluxes for Highly Alloyed Steels Tetsu-to-Hagané Advance Publication
  7. Evaluation and Prediction of Blast Furnace Status Based on Big Data Platform of Ironmaking and Data Mining ISIJ International Advance Publication
  8. Potential Influences of Impurities on Properties of Recycled Carbon Steel ISIJ International Advance Publication
  9. Optimization Analysis of Mechanical Performance of Copper Stave with Special-shaped Tubes in the Blast Furnace Bosh ISIJ International Advance Publication
  10. Influence of Soil Particle Size, Covering Thickness, and pH on Soil Corrosion of Carbon Steel ISIJ International Advance Publication

Search Phrase Ranking

22 Sep. (Last 30 Days)

  1. blast furnace
  2. jeong-sik kim
  3. blast furnace productivity
  4. blast furnace permeability
  5. continuous casting of copper alloys
  6. 柳修介
  7. isij international
  8. tetsu
  9. tetsu-to-hagane
  10. エッジドロップ