低濃度NaCl水溶液中における高純度18Cr-14Ni鋼のすきま再不動態化電位および脱不動態化pHに及ぼす合金元素の影響

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  • The Effects of Alloying Elements on Repassivation Potential for Crevice Corrosion and Depassivation pH for High Purity 18Cr-14Ni Steel in NaCl Solutions
  • テイ ノウド NaCl スイヨウエキチュウ ニ オケル コウ ジュンド 18C

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Effects of P, Si, Mn and Cu on the repassivation potential (ER) for the metal/metal-crevice were studied with high purity 18Cr-14Ni steels with systematic variations in alloying elements in 3×10-3-3% NaCl solutions at 80°C. The depassivation pH, pHd, for the steels were also measured in a deaerated 3% NaCl solution at 25°C. It is found that P has a strong effect on both ER and pHd values. Decreasing P content makes ER less noble. Increasing P content is beneficial to lower pHd in line with a general tendency that an element which raises ER lowers pHd. Si, Mn and Cu give no significant change in ER and pHd values.

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