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. 48 (1999), No. 7

  • International Standardization of Surface Analysis

    Kazuhiro Yoshihara

    pp. 395-399

    Bookmark

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

    Log in / Sign Up

    Abstract

    Versailles Project on Advanced Materials and Standards (VAMAS project) was set up in 1982. Since then, 22 Technical Working Areas have been established, one of which was Surface Chemical Analysis, In the VAMAS project, the accuracy of quantitative analysis by Auger Electron Spectroscopy or X-ray Photoelectron Spectroscopy was examined by Inter-Laboratory Study, and the “standard” procedures for the quantitative analysis have been proposed. These proposed procedures were passed to ISO, and some of these have been ISO standards after the discussions in TC 201. In this paper, the activities of VAMAS and ISO are introduced, and the proposed calibration procedures for the energy and intensity scales of the electron spectroscopy are explained. The software to share spectra with ISO format is also briefly explained.

  • Surface and Grain Boundary Segregation

    Shigeru Suzuki

    pp. 400-404

    Bookmark

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

    Log in / Sign Up

    Abstract

    Alloying and impurity elements are more or less segregated at surface and grain boundaries of metals and alloys. Surface analytical techniques have been applied to characterize the segregation behavior, and provided characteristic features of each element. The present paper reviews some typical results of the segregation or enrichment behavior of the elements in polycrystalline alloys, especially steels, and discusses the effect of the microstructure on the surface and grain boundary segregation.

  • State Analysis of Fine Precipitates in Metallic Materials

    Fumio Kurosawa

    pp. 405-413

    Bookmark

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

    Log in / Sign Up

    Abstract

    Modern techniques of analytical and structural investigation have been providing an increasing amount of detailed information about precipitation, distribution and state of the microalloying element in metallic materials and contribution to the understanding of their various roles and effect. This paper reviews the contribution of chemical and instrumental analysis to the characterization of metallic materials. This methods include advanced techniques of precipitates analysis, local probe analysis, structural analysis, and direct or in situ observation.

  • Atomic Level Analysis of Surfaces by a Scanning Atom Probe (SAP)

    Osamu Nishikawa

    pp. 414-420

    Bookmark

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

    Log in / Sign Up

    Abstract

    The structure and unique feature of a scanning atom probe (SAP) are described. The atomic level mass analysis by the SAP is demonstrated by analyzing the diamonds formed by the chemical vapor deposition (CVD), graphites, vitreous carbon and silicon microtips fabricated by lithographic process. The analysis revealed that the CVD diamonds contain a large amount of hydrogen. Furthermore, a significant difference between the mass spectra of the diamonds, graphite and vitreous carbon is noticed. The study also shed light on the oxygen, carbon and fluorine diffusion into the silicon tips immersed in hydrofluoric acid. Applicability of the SAP for the study of corrosion process is discussed.

  • Initiation Process of Type I Pitting Corrosion on Copper Water-Tubes

    Kazuharu Sobue, Shin'ichi Magaino, Akihiro Kawaguchi, Masayasu Soga, Mikio Furuya, Hiroshi Nakajima, Yutaka Yamada, Hachiro Imai

    pp. 425-431

    Bookmark

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

    Log in / Sign Up

    Abstract

    Copper tubes have been widely used for water supply and heat exchangers. In such systems copper tubes often suffer from type I pitting-corrosion. A mechanism of the type I pitting-corrosion on copper tubing has been presented, but a initiation mechanism of the pitting corrosion is still unknown. In this paper we aimed to clarify the initiation mechanism of the pitting corrosion.
    Copper-tube specimens were immersed in a circulating solution. The solution had been used for heat exchangers at a Japanese factory where the water leakage occurred by the pitting corrosion on copper tubes. The solution contained tiny precipitates resulted from corrosion of galvanized steel pipe. During the immersion test changes in the surface state of a copper tube was analyzed by in situ RAMAN (in situ Raman Spectroscopy), SEM (Scanning Electron Microscope), EPMA (Electron Probe Microanalysis), AES (Auger, Electron Spectroscopy) and XPS (X-ray Photoelectron Spectroscopy).
    The pitting corrosion was observed only in the test solution which had been used for heat exchangers. It was considered that Cu2O film on the copper-tube surface became less stable on which the tiny precipitates deposited, and that Cu2O film could not protect the copper-tube surface. It will be the cause why the type I pitting-corrosion occurred.

  • Study of Galvanic Corrosion Behavior for Aluminized Steel in Seawater

    Hiroki Kimoto

    pp. 432-438

    Bookmark

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

    Log in / Sign Up

    Abstract

    The temperature influences on the corrosion rate of hot-dipped aluminized steel in the seawater were investigated for the galvanic couples of the aluminum/carbon steel, the aluminum/Fe-Al alloy, the aluminum/stainless steel, the Fe-Al alloy/carbon steel, the Fe-Al alloy/stainless steel, and the carbon steel/stainless steel.
    In all the couples, the corrosion rate of aluminum is larger than the corrosion rate of aluminum which is not connected with other metals. The corrosion rates grow in order of aluminum/carbon steel>aluminum/stainless steel>aluminum/Fe-Al alloy. The corrosion rate of aluminum connected with the carbon steel is the largest. The corrosion rate is seven times larger than the corrosion rate of aluminum, which is not connected with other metals.
    The galvanic corrosion rate of the carbon steel, which is connected with Fe-Al alloy or stainless steel, is larger than the corrosion rate of aluminum, which is not connected with other metals. The galvanic corrosion rate of the carbon steel is 1.3-1.8 times larger than the corrosion rate of carbon steel which is not connected with other metals.

  • Corrosion Countermeasures of CFC Decomposition Device

    Yasuo Hira, Shin Tamata

    pp. 439-444

    Bookmark

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

    Log in / Sign Up

    Abstract

    To manufacture a highly reliable CFC (Chlorofluoro Carbon) decomposition device, we desire to reduce various possible potentials in the device. This device has the advantage in operating at lower temperature utilizing catalysis for the decomposition. In this device, three parts have high corrosion potentials. These three are (1) a radiator (2) a dehydrator and (3) a fan. As a result of taking possible effective measures to these parts, it became possible to produce a decomposition device with less corrosion problems.

  • Determination of Pinhole Defects in Diamond-Like Carbon Film by Electrochemical Test with CPCD Method

    Akemi Tsuchiyama, Mamoru Minami, Hiroki Hasuyama, Yasuyuki Takatani

    pp. 445-450

    Bookmark

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

    Log in / Sign Up

    Abstract

    Diamond-like carbon (DLC) films were coated on SUS 304 stainless steel using an ionization deposition method and the area of defects in the films was determined by the critical passivation current density (CPCD) method. The area of pinhole defects in the DLC films (Ri) was evaluated as functions of applied negative bias voltage and the film thickness. The value of Ri for the films thinner than 100nm was not influenced by the bias voltage. On the other hand, the value of Ri for the films thicker than 100nm decreased with increasing bias voltage. For each bias voltage, the density and size of the defects in the DLC films decreased with increasing their thickness. In particular, the Ri-value of the film of 550nm thickness prepared at the bias voltage of -2000V was approximately 0.01%, being lower by a factor of 100 than that of TiN films with similar thickness which was prepared by hollow cathode discharge technique. Therefore, it is concluded from the present work that the protection ability has been improved remarkably by the DLC films (below 600nm) prepared by the ionization deposition method.

  • Mechanism on Ware Soiling with Silica Scale

    Takeshi Nishikawa, Fumiyasu Ishiguro, Ryozo Amano

    pp. 451-453

    Bookmark

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

    Log in / Sign Up
  • © 1999 Japan Society of Corrosion Engineering

Article Access Ranking

26 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. Numerical Simulation of Multiphase Flow and Mixing Behavior in an Industrial Single Snorkel Refining Furnace (SSRF): The Effect of Gas Injection Position and Snorkel Diameter ISIJ International Advance Publication

Search Phrase Ranking

26 Mar. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. galvanizing
  5. tuyere abrasion
  6. tuyere erosion
  7. tuyere failure
  8. lme
  9. wear on tuyere
  10. 鉄と鋼