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Pitting of AISI 304 stainless steel in bicarbonate and chloride solutions

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Abstract

Metastable and stable pitting on 304 stainless steel (SS304) in 0.1–0.5 m NaCl aqueous solution (pH ~8) has been investigated using a potentiodynamic, a potentiostatic and a weak anodic current galvanostatic techniques. The addition of bicarbonate (0.025–0.5 m) to the solution had an inhibiting effect, manifested by a shift of the pitting potentials to more positive values, a longer induction time for pitting and reduced pit nucleation. The pit nucleation frequency and growth, in the metastable and stable states, decrease as the NaHCO3/NaCl molar concentration increases and pitting is no longer observed for NaHCO3/NaCl molar ratios higher than 3 (four times larger % wt of NaHCO3). Pitting events never occurred at a potential below −0.1 V, fewer metastable events were observed at higher temperature (50°C) and none were observed in chloride free bicarbonate solutions. The inhibiting behaviour of oxyanions is discussed.

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Authors and Affiliations

  1. De´partement de Chimie, Universite´ de Sherbrooke, Sherbrooke, Que´bec, Canada, J1K 2R1

    M. DROGOWSKA  & H. ME´NARD

  2. Institut de recherche d'Hydro-Que´bec (IREQ), Varennes, Que´bec, Canada, J3X 1S1

    L. BROSSARD

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  1. M. DROGOWSKA
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  2. H. ME´NARD
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  3. L. BROSSARD
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DROGOWSKA , M., ME´NARD , H. & BROSSARD , L. Pitting of AISI 304 stainless steel in bicarbonate and chloride solutions. Journal of Applied Electrochemistry 27, 169–177 (1997). https://doi.org/10.1023/A:1018499823288

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