Effect of Nitrogen on the Corrosion Behavior of Stainless Steels in Solutions with Low pH and a High Concentration of Chloride

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Other Title
  • 低pH<sub>-</sub>高Cl<sup>-</sup>濃度溶液中におけるステンレス鋼の腐食挙動に及ぼす窒素の影響
  • 低pH-高Cl-濃度溶液中におけるステンレス鋼の腐食挙動に及ぼす窒素の影響
  • テイpH コウCl- ノウド ヨウエキ チュウ ニ オケル ステンレスコウ ノ

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Abstract

Effect of nitrogen on the corrosion behavior of austenitic stainless steels was investigated in solutions with low pH and a high concentration of chloride simulating the inside solution of corroding crevice. Nitrogen suppressed the anodic dissolution current of the steels over the potential range of 0 to 500mV vs. Ag/AgCl in 5kmol/m3 NaCl-pH 1 solutions. On the extension behavior of the corroding area over the specimen surface, nitrogen decreased considerably the extension rate of corroding area and changed its microscopic morphology. For the 0.02% nitrogen steel, the corroding area extended by pitting in the passive side of the active/passive boundary, whereas for the 0.2% nitrogen steel, no pitting was observed. Nitrogen had almost no effect both on the depassivation pH, and on the anodic dissolution current in severely corrosive solutions where the passivation did not occur. The suppressive effect of nitrogen on the extension rate of the corroding area may have a correlation with the suppression of the growth of pitting type crevice corrosion.

Journal

  • Zairyo-to-Kankyo

    Zairyo-to-Kankyo 47 (9), 577-583, 1998

    Japan Society of Corrosion Engineering

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