ステンレス鋼上に成膜された酸化物皮膜の欠陥評価 -電気化学的手法と光学的手法の比較- Evaluation of Pinhole Defects in Oxide Films Coated on Stainless Steel -A Comparison of Electrochemical and Optical Techniques-

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PVD and CVD ceramic coatings have been developed to improve the corrosion resistance of stainless steel. In films coated by processes such as rf sputtering, piercing defects such as pinholes inevitably exists and these defects play a significant role in corrosion. In this study, various oxide films were coated on stainless steel by rf sputtering and pinhole defects in the coating films were evaluted using an electrochemical and an optical technique. The electrochemical technique was to evaluate the total defect area of the film using the value of the critical passivation current density in the course of anodic polarization in an 0.5kmol/m<sup>3</sup>H<sub>2</sub>SO<sub>4</sub>+0.01kmol/m<sup>3</sup> KSCN solution, which restricts the passivation of the substrate steel. The optical technique was to evaluate film defects by observing the dynamic scattering of liquid crystal molecules induced by current flow through the film defects (a liquid crystal was inserted between the oxide film and a tranparent electrode). The defect probabilities of the films obtained through the two techniques showed good agreement. The optical techniques can observe the defects in films non-destructively, though it is limited to use with insulating films on conductive 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 47(2), 178-182, 1996-02 

    The Surface Finishing Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002255761
  • 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
    3926767
  • 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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