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Electrochemical Study on Enhanced Corrosion Resistance of Titanium Nitride Films Prepared by Ion Mixing and Vapor Deposition Method

Research Project

Project/Area Number 10650095
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionHimeji Institute of Technology

Principal Investigator

UCHIDA Hitoshi  Himeji Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (30047633)

Co-Investigator(Kenkyū-buntansha) YAMASHITA Masato  Himeji Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (60291960)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsTitanium nitride film / Ion Mixing and Vapor Deposition / Pinhole defect / Anodic polarization curve
Research Abstract

TiN films prepared by dry coating process such as physical vapor deposition exhibit superior wear and good corrosion resistance, and furthermore their appearance is attractive gold-like color. The most important point in coating corrosion-resistant films is to make no micro-defects because the corrosion of film starts form a defective part such as a perforating pinhole. In order to minimize pinhole defect density in a TiN film, the process parameters must be adequately controlled, and a quick and quantitative evaluation method of pinhole defect must be developed. Incidentally, the critical passivation current density (CPCD) method makes use of the fact that the critical passivation current density of metals exhibiting active-passive transition varies in proportion to the metal surface area. When a coating is applied over this sort of metal substrate, the metal part at the bottom of the perforating pinhole is subjected to active dissolution in the range of the active potential region. T … More hus the intensity of the measured critical passivation current density, becomes proportional to the exposed substrate area at the bottom of pinholes. In this study, therefore, the electrochemical CPCD method was used to quantitatively evaluate the pinhole defect area for the TiN-coated stainless steels prepared by ion mixing and vapor deposition method.
The performance of ion mixing and vapor deposition machine used was studied from the aspect of evaculation, ion beam, substrate temperature and film thickness, and the TiN film prepared was evaluated successfully by SEM, XRD, AES and XPS methods. The TiN films were homogeneous and with the characteristic gold-like color. They exhibited the columnar structure with the preferential orientations, and contained more or less pinhole defects. Here, the electrochemical evaluation of pinhole defects is focused on the TiN films deposited onto stainless steels. The critical passivation current density IィイD2critィエD2 in the TiN films prepared at normal temperature of substrate decreased with increasing film thickness. Above1.5μm in thick films, however, there was an increasing tendency in the IィイD2critィエD2 with cracking and/or peeling. On the other hand, the IィイD2critィエD2 in the TiN films prepared at 300℃ decreased considerably with increasing film thickness, and the resulting corrosion resistance was improved by TiN-coating. The area ratio of pinhole defects was evaluated by the ratio of IィイD2critィエD2 of a coated and a non-coated specimens, i.e., by CPCD method. It is demonstrated that such electrochemical measurement is superior as an evaluation method for the pinhole defects of corrosion-resistive coating films. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] H. UCHIDA, M. YAMASHITA: "Electrochemical Defect Evalution of TiN Films Prepared by Dry Coating Process"Proc. 14th Int. Corrosion Congress. Vol. 2. 163/1-163/5 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 内田 仁,山下正人: "イオンミキシング蒸着装置の特性とその応用"プラズマ応用と複合機能材料. Vol. 8. 97-100 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hitoshi UCHIDA: "Electrochemical Defect Evalution of TiN Films Prepared by Dry Coating Process"Proc.14th Int.Corrosion Congress. 2. 163/1-5 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hitoshi UCHIDA: "Performance of Ion Mixing and Vapor Deposition Machine and Its Application"Plasma Application & Hybrid Functionally Materials. 8. 97-100 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.UCHIDA and M.YAMASHITA: "Electrochemical Defect Evalution of TiN Films Prepared by Dry Coating Process"Proc.14th Int.Corrosion Congress. Vol.2. 163/1-163/5 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 内田 仁、山下正人: "イオンミキシング蒸着装置の特性とその応用" プラズマ応用と複合機能材料. Vol.8,Mar.97-100 (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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