高温塩化物水溶液中におけるステンレス鋼の孔食に及ぼす窒素およびモリブデン化学種の影響 Effect of Nitrogen and Moribdenum Species on the Pitting of Stainless Steel in High Temperature Chloride Solutions

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The effects of alloyed nitrogen and molybdenum on the pitting behavior of austenitic stainless steels were examined comparing with that of corresponding oxyacid salts (i.e. nitrate and molybdate) in a solution. The comparison was made through measurements of pitting potential as a function of temperature up to 423 K and that of pitting temperature as a function of applied potential. Both alloyed nitrogen and nitrate ion in a solution showed inhibitive effect at lower temperatures rather than at high temperatures. Pitting temperatures measured in a solution containing nitrate showed a unique dependency on potential: the nobler the potential, the higher the pitting temperature. However, it could not be revealed that alloyed nitrogen inhibited pitting through formation of nitrate ion because stainless steels alloyed with nitrogen did not show the similar dependency of pitting temperature on applied potential. Both alloyed molybdenum and molybdate in a solution enhanced pitting potential more effectively at higher temperatures, possibly because the film formation reaction in which molybdenum species involved proceeded more rapidly at higher temperatures. However molybdate ion could miss its distinctive effect at high temperatures when a specimen was polarized before heating. Excellent inhibition of pitting was realized at every temperature when nitrate and molybdate ions were mixed into a chloride solution: nitrate worked at nobler potentials even at lower temperatures and molybdate worked at higher temperatures even at less noble potentials. The stainless steel which contained both nitrogen and molybdenum also showed good performance against chloride solutions, uniting the individual advantages.

収録刊行物

  • 材料と環境 : zairyo-to-kankyo

    材料と環境 : zairyo-to-kankyo 47(9), 591-598, 1998-09-15

    Japan Society of Corrosion Engineering

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各種コード

  • NII論文ID(NAID)
    10002174992
  • NII書誌ID(NCID)
    AN10235427
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09170480
  • NDL 記事登録ID
    4559395
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-266
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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