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Elucidation of the effect of organic acids on corrosion behavior of steam turbine materials

Research Project

Project/Area Number 17K06051
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionShinshu University

Principal Investigator

NIU LIBIN  信州大学, 学術研究院工学系, 准教授 (20262694)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords腐食 / ボイラ水 / 蒸気タービン材料 / 有機酸 / 塩化物イオン / 不働態皮膜 / 孔食
Outline of Final Research Achievements

The effect of organic acids (formic acid and acetic acid) in simulated boiler water containing typical corrosive impurities of chloride ions on the corrosion behavior of low-pressure steam turbine materials was investigated using various corrosion tests and surface analyses. For 13Cr stainless steel of blade materials, the formic acid and acetic acid in chloride-containing boiler water showed suppression behavior of localized corrosion such as pitting corrosion. However, for 3.5NiCrMoV steel of rotor materials, formic acid in chloride-containing boiler water promoted corrosion in long-term corrosion tests, while acetic acid exhibited no obvious influence of accelerating corrosion. Based on the analysis results of the film formed on the material surface, the mechanism of influence of organic acids on the corrosion behavior of steam turbine materials was discussed.

Academic Significance and Societal Importance of the Research Achievements

火力発電プラントボイラ給水・補給水には、ボイラなどの腐食や固形析出物によるスケール生成・堆積を防止するために、経験や実験データに基づき、アンモニアが代表的なpH調整用添加薬剤として使用されてきた。近年では、有機アミン類水処理薬剤を採用する傾向が見られている。しかしながら、国内外を問わず有機アミンの生成物として有機酸がプラント機器に与える影響などに関する基礎知見は不足している。低圧蒸気タービン材料の腐食挙動および不働態皮膜の形成と破壊に及ぼすこれらの有機酸の影響に関して、本研究の成果は火力発電プラントの信頼性確保などに貢献できる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (13 results)

All 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Effect of chloride and sulfate ions on crevice corrosion behavior of low-pressure steam turbine materials2018

    • Author(s)
      Niu Li-Bin、Okano Koji、Izumi Sakae、Shiokawa Kunio、Yamashita Mitsuo、Sakai Yoshihiro
    • Journal Title

      Corrosion Science

      Volume: 132 Pages: 284-292

    • DOI

      10.1016/j.corsci.2017.12.017

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Stress Corrosion Cracking Behavior of Hardening-Treated 13Cr Stainless Steel2018

    • Author(s)
      Niu Li-Bin、Ishitake Hisamitsu、Izumi Sakae、Shiokawa Kunio、Yamashita Mitsuo、Sakai Yoshihiro
    • Journal Title

      IOP Conference Series: Materials Science and Engineering

      Volume: 317 Pages: 012073-012073

    • DOI

      10.1088/1757-899x/317/1/012073

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 塩化物イオン含有ボイラ水中における13Cr鋼の電気化学的腐食挙動に及ぼす酢酸の影響2019

    • Author(s)
      早坂僚太, 牛 立斌
    • Organizer
      日本金属学会北陸信越支部日本鉄鋼協会北陸信越支部令和元年度連合講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Effect of Formic Acid on SCC Susceptibility of LP Steam Turbine Blade Materials in the Water with Added Chloride Ions2019

    • Author(s)
      Li-Bin Niu, Masato Nakayama, Keigo Kita
    • Organizer
      2019 International Conference on Engineering Materials (ICEM 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 火力発電プラント水・蒸気サイクルにおける機器材料の腐食に対する有機アミンの影響2018

    • Author(s)
      牛 立斌
    • Organizer
      日本鉄鋼協会北陸信越支部 平成30年度湯川記念講演会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Corrosion behavior of STBA24 steel and its weldment in the simulated boiler water added chloride ions and formic acid2018

    • Author(s)
      Li-Bin Niu, Shoichi Kosaka
    • Organizer
      17th Inter. Confer. on the Properties of Water and Steam (17th ICPWS)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Corrosion resistance of modified heat-treated 16Cr-4Ni steel for geothermal steam turbine blades2018

    • Author(s)
      Li-Bin Niu, Yang Xiao, Sakae Izumi, Kunio Shiokawa, Mitsuo Yamashita, Yoshihiro Sakai
    • Organizer
      18th Asian Pacific Corrosion Control Conference (APCCC18)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 塩化物イオン含有ボイラ水中における3.5NiCrMoV鋼の腐食挙動に及ぼす酢酸の影響2018

    • Author(s)
      衣 偉東、牛 立斌
    • Organizer
      日本金属学会北陸信越支部日本鉄鋼協会北陸信越支部平成30年度連合講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 塩化物イオンおよびギ酸含有ボイラ水中における13Cr鋼のすきま腐食挙動2018

    • Author(s)
      尾鷲宣和、峯村 希、牛 立斌
    • Organizer
      日本金属学会北陸信越支部日本鉄鋼協会北陸信越支部平成30年度連合講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 発電プラントボイラ機器材料および蒸気タービン材料の腐食に対する有機アミン類水処理薬剤の影響2017

    • Author(s)
      牛 立斌
    • Organizer
      ターボ機械協会 平成29年度第3回蒸気タービン技術向上分科会(基調講演)
    • Related Report
      2017 Research-status Report
  • [Presentation] 塩化物イオンおよびギ酸含有ボイラ水中における3.5NiCrMoV鋼のすきま腐食挙動2017

    • Author(s)
      岡野光司、尾鷲宣和、牛 立斌
    • Organizer
      日本金属学会北陸信越支部・日本鉄鋼協会北陸信越支部 平成29年度連合講演会
    • Related Report
      2017 Research-status Report
  • [Presentation] 塩化物イオン含有ボイラ水中における13Cr鋼の孔食に及ぼすギ酸の影響2017

    • Author(s)
      窪田隼人、鈴木真琳、牛 立斌
    • Organizer
      日本金属学会北陸信越支部・日本鉄鋼協会北陸信越支部 平成29年度連合講演会
    • Related Report
      2017 Research-status Report
  • [Presentation] 塩化物イオン含有ボイラ水中における3.5NiCrMoV鋼の腐食挙動に及ぼすギ酸の影響2017

    • Author(s)
      衣 偉東、窪田隼人、牛 立斌
    • Organizer
      日本機械学会[No.187-1]北陸信越支部第55期総会・講演会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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