カソード分極中におけるアノード酸化皮膜化成ニオブ電極への水素吸収 Hydrogen Absorption into Anodized Niobium Electrodes during Cathodic Polarization

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Cathodic polarization of niobium specimens that have been anodized galvanostatically up to E<sub>a</sub>=100V, and then potentiostatically at E<sub>a</sub>=100V has been investigated in a neutral borate solution. During potetiostatic cathodic polarization below E<sub>c</sub>=−2.36V (vs. RHE) in both aerated and deaerated solutions, the cathodic current increased rapidly initially, and then increased gradually until it reached a steady value. Hydrogen gas evolution was observed during cathodic polarization below E<sub>c</sub>=−2.36V with no formation of blisters and pits, suggesting that H<sup>+</sup> reduction occurs mainly at the film surface. GD-OES spectra revealed that hydrogen species are enriched in the niobium substrate near the interface between anodic oxide films and the substrate at potentials below E<sub>c</sub>=−2.36V, and that the trend is pronounced at lower potentials. Chemical shift was observed on Nb 3d and O 1s peaks in XPS spectra for the specimen at E<sub>c</sub>=−3.36V, suggesting the formation of Nb<sub>2</sub>O<sub>3</sub>(OH)<sub>2</sub>.<br>Mechanism for the reaction during cathodic polarization in a neutral solution is discussed in terms of the proton reduction at the interfaces both between oxide films / solutions and between oxide films / substrates.

収録刊行物

  • 表面技術 = The Journal of the Surface Finishing Society of Japan

    表面技術 = The Journal of the Surface Finishing Society of Japan 59(5), 326-332, 2008-05-01

    The Surface Finishing Society of Japan

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各種コード

  • NII論文ID(NAID)
    10021169924
  • NII書誌ID(NCID)
    AN1005202X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09151869
  • NDL 記事登録ID
    9503239
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-291
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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