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In-situ high-resolution observation and analysis of passive film of stainless steel in aqueous solution by atomic force microscopy

Research Project

Project/Area Number 17K18997
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Materials engineering and related fields
Research InstitutionHiroshima Institute of Technology

Principal Investigator

Wang Rongguang  広島工業大学, 工学部, 教授 (30363021)

Co-Investigator(Kenkyū-buntansha) 土取 功  広島工業大学, 工学部, 教授 (20771801)
福島 千晴  広島工業大学, 工学部, 教授 (30262752)
Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsステンレス鋼 / 不動態皮膜 / その場観察 / 原子間力顕微鏡 / 不働態皮膜 / 平面断面形態
Outline of Final Research Achievements

The compact passive film protects stainless steel from corrosion and its in-situ thickness should be different in various surroundings. In this study, the in-situ observation by AFM in various aqueous solutions was conducted on SUS304 steel, by removing the present film and then reproducing a new film in designated aqueous solution. The height variation of the steel surface was calculated as the thickness of the reproduced passive film. As a result, the passive film on the steel appeared in solutions with pH equal to or larger than 2.8 and became thicker in solution with larger pH, while the chloride ions caused thinner film. The in-situ thickness measured in water was confirmed to be a little larger than that in vacuum. In addition, the thickness of passive film on sensitized SUS329J4L steel was also measured and compared. The thickness on sigma phase with more Cr content is thinner than that on gamma primer phase with less Cr.

Academic Significance and Societal Importance of the Research Achievements

本研究では、種々水溶液中でのステンレス鋼の不動態皮膜の厚さを新しい考えをもってin-situに測定・検証してきた。これは、不動態皮膜に依存するあらゆる機能性金属(例えば、Al合金やTi合金等)にも適用できる。こうしたin-situ測定は、これからの高速FM-AFMやSTMの進化によって不動態皮膜の形成途中での原子像や原子配列の直接観察に活用できる。また、複相、結晶粒、結晶粒界上での不動態皮膜の形成・消失・破壊挙動が解明でき、今後の不動態皮膜の強化方法の開発に繋がる。なお、不動態皮膜の構造解明は、耐食性、耐摩耗性、潤滑性、導電性等の向上に良い影響を与え、コストの削減や生産効率の向上に貢献できる。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (6 results)

All 2019 2018 Other

All Int'l Joint Research (2 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] 清華大学/材料学院(中国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] 広西大学/化学化工学院(中国)

    • Related Report
      2018 Annual Research Report
  • [Presentation] SUS304ステンレス鋼不動態皮膜の液中AFMによるその場測定2019

    • Author(s)
      李運輝,肖天, 王栄光, 福島千晴, 土取功
    • Organizer
      2019年腐食防食協会中国・四国支部「材料と環境研究発表会」
    • Related Report
      2018 Annual Research Report
  • [Presentation] SUS304 ステンレス鋼の再生不動態皮膜厚さの液中原子間力顕微鏡によるその場測定2019

    • Author(s)
      王栄光、李運輝、肖天、福島千晴、土取功
    • Organizer
      日本金属学会2019年春期(第164回)大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] XPS, TEMおよび EC-AFMを用いたステンレ鋼不動態皮膜の測定2018

    • Author(s)
      李運輝,肖天,王栄光,凌雲漢,福島千晴,土取功
    • Organizer
      日本鉄鋼協会・日本金属学会中国四国支部 鉄鋼第61回・金属第58回合同講演大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Passive Film on Stainless Steel Analyzed by XPS, TEM and EC-AFM2018

    • Author(s)
      Yunhui Li, Tian Xiao, Rongguang Wang, Yunhan Ling, Zhaoxia Lu, Chiharu Fukushima, Isao Tsuchitori
    • Organizer
      18th Asian Pacific Corrosion Control Conference (18th APCCC)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research

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Published: 2017-07-21   Modified: 2020-03-30  

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