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2006 Fiscal Year Final Research Report Summary

Development of the protecting method for hydrogen(and its isotopes) permeation through metallic pipes by cathodic polarization

Research Project

Project/Area Number 16360373
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionNagoya Institute of Technology

Principal Investigator

FUKATSU Norihiko  Nagoya Institute of Technology, Engg., Materials Sci. and Engg., Prof. (80029355)

Co-Investigator(Kenkyū-buntansha) KURITA Noriaki  Nagoya Institute of Technology, Engg., Materials Sci. and Engg., Asso. Prof. (20292401)
Project Period (FY) 2004 – 2006
Keywordsα-alumina / proton conduction / hydrogen solubility / solid electrolyte / hydrogen sensor / cathodic protection / hydrogen concentration cell / cathodic polarization
Research Abstract

The permeation of hydrogen through the pipe made of Fe-Cr-Al heat-resisting alloy (Cr22%, Al5%, Fe63% usually called "Kanthal Alloy") was measured by coulometric titration method. Even without any pretreatments, the measured permeability coefficient was found about one thousandth of that of usual heat-resisting Fe-Cr alloy. The measured value was nearly equal with that of alumina ceramics of the compatible thickness with the oxide layer formed on the metallic pipe, which suggests that the hydrogen permeation through the Fe-Cr-Al alloy pipe is controlled by the alumina layer formed on the surface of the pipe.
The electromotive force established across the oxide film formed on the surface of the Fe-Cr-Al pipe and its polarization effect were studied in order to examine the possibility of cathodic protection of the hydrogen permeation. By emf measurement the hydrogen potential in the alloy substrate was confirmed to be maintained at high value due to the chemical polarization effect which … More had been already pointed out by us. The effect of cathodic polarization on the hydrogen permeation, however, was not confirmed clearly because the oxide film was made unstable by polarization in the reducing condition and also the permeation rate was naturally at very low value. Therefore, the pipe of polycrystalline alumina ceramics with porous platinum electrodes on inner and outer sides were employed in the place of the oxide film formed on the surface of the metallic pipe and the effect of polarization on this sample was studied in detail.
It was confirmed that hydrogen was incorporated or released from the bulk of alumina on the change of the polarization conditions. This phenomenon was analyzed by calculating the hydrogen chemical potential profile in the polarized specimen. Based on this analysis, the solubility of hydrogen into the commercial polycrystalline alumina was determined. After a period of cathodic polarization by imposing 0.8V at 1573 K, it was observed that the permeation through the alumina pipe was perfectly blocked. Therefore, the possibility of cathodic protection of hydrogen permeation of a metallic pipe was confirmed if the stable alumina film doped with bivalent elements was formed on the surface of the pipe.
The new phenomena such as the extraordinary incorporation of hydrogen at initial stage of oxidation of the metal, the super saturation of hydrogen into alumina, and the new mechanism relating with the hydrogen/proton electrode reaction were observed in the course of this study. The possible explanations of these phenomena were also given in the sub works of this research. Less

  • Research Products

    (17 results)

All 2008 2007 2006 2005

All Journal Article (16 results) Book (1 results)

  • [Journal Article] Electromotive Force of Gas Concentration Cell Using Alumina-Rich Nonstoichiomeiric Magnesium Aluminate Spinel as the Solid Electrolyte2008

    • Author(s)
      Y.Okuyama, N.Kurita and N.Fukatsu
    • Journal Title

      Materials Transactions 49

      Pages: 187-192

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Electromotive Force of Gas Concentration Cell Using Alumina-Rich Nonstoichiometric Magnesium Al-minate Spinel as the Solid Electrolyte2008

    • Author(s)
      Y. Okuyama, N. Kurita and N. Fukatsu
    • Journal Title

      Materials Transactions 49

      Pages: 187-192

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Proton Conduction in α-Alumina and its Application to Hydrogen Sensor for Molten Metals2007

    • Author(s)
      N.Fukatsu and N.Kurita
    • Journal Title

      Ionics 13

      Pages: 183-194

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrogen Sensor for Molten Copper2007

    • Author(s)
      N.Fukatsu and N.Kurita
    • Journal Title

      Cu2007-VolumeVII, Process Control, Optimization, and Six Sigma, Edited by R.L.Stgphens and G.A.Elthngham, Toronto, Camada VII

      Pages: 177-187

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Proton Conduction in x-Alumina and its Application to Hydrogen Sensor for Molten Metals.2007

    • Author(s)
      N. Fukatsu and N. Kurita
    • Journal Title

      Ionics 13

      Pages: 183-194

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Hydrogen Sensor for Molten Copper2007

    • Author(s)
      N. Fukatsu, N. Kurita
    • Journal Title

      Cu2007 Process Control, Optimization, and Six Sigma, VolumeVil

      Pages: 177-187

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Hydrogen and Oxygen Chemical Potential Dependence of Electrical Conductivity of SrCe_<0.35>Yb_<0.05>O_<3-x>2006

    • Author(s)
      N.Fukatsu, KMasuoka, H.Kato and N.Kurita
    • Journal Title

      Advanced Materials Research 11-12

      Pages: 125-128

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Electrical Conductivity of Barium-Doped a-Alumina2006

    • Author(s)
      Y.Okuyama, N.Kurita and N.Fukatsu
    • Journal Title

      Advanced Materials Research 11-12

      Pages: 145-148

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Technological Aspect of the Nature of Proton Conducting Oxide in Designing High-Temperature Electrochemical Cell2006

    • Author(s)
      N.Fukatsu and N.Kurita
    • Journal Title

      Proceedings of Masuko Symposium, The 16th Iketani Conference 16

      Pages: 361-394

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrogen and Oxygen Chemical Potential Dependence of Electrical Conductivity of SrCe_<0.95>Yb_<0.95>O_<3-x>.2006

    • Author(s)
      N. Fukatsu, H. Masuoka, H. Kato, N. Kurita
    • Journal Title

      Advanced Materials Research 11-12

      Pages: 125-128

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Electrical Conductivity of Barium-Doped a-Alumina.2006

    • Author(s)
      Y. Okuyama, N.Kurita and N. Fukatsu
    • Journal Title

      Advanced Materials Research 11-12

      Pages: 145-148

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Technological Aspect of the Nature of Proton Conducting Oxide in Designing High-Temperature E1ectrochemical Cell.2006

    • Author(s)
      N. Fukatsu, N. Kurita
    • Journal Title

      Proceedings of Masuko Symposium The 16th Iketani Conference 16

      Pages: 361-394

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Hydrogen Sensor Based on Oxide Proton Conductors and Its Application on Metallurgical Enging2005

    • Author(s)
      N.Fukatsu and N.Kurita
    • Journal Title

      Ionics 11

      Pages: 1-12

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Defect Structure of Alumina-Rich Nonstoichiometric Magnesium Spinel2005

    • Author(s)
      Y.Okuyama, N.Kurita and N.Fukatsu
    • Journal Title

      Solid State Ionics 177

      Pages: 59-64

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrogen Sensor Based on Oxide Proton Conductors and Its Application on Metallurgical Engineering.2005

    • Author(s)
      N. Fukatsu, N. Kurita
    • Journal Title

      lonics 11

      Pages: 1-12

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Defect Structure of Alumina-Rich Nonstoichiometric Magnesium Aluminate Spinel.2005

    • Author(s)
      Y. Okuyama, N. Kurita, N. Fukatsu
    • Journal Title

      Solid State lonics 177

      Pages: 59-64

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] ナノイオニクス-最新技術とその展望アルミナ薄膜を固体電解質とした水素センシングデバイス2007

    • Author(s)
      栗田 典明
    • Total Pages
      308
    • Publisher
      山口周監修シーエムシー出版
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2010-02-04  

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