Abstract
AbstractThe pitting corrosion behaviour of UNS N08904 (type 904L) stainless steel (SS) in 3 × 10-3 M Na2S, in 0·6M NaCl, and in 0·6M NaCl with different concentrations of Na2S at elevated temperature was studied using potentiodynamic anodic polarisation and scanning electron microscopy (8EM). Type 904L S8 did not pit in pure 3 × 10-3M Na2S at 60°C, while pitting corrosion of type 904L SS in chloride-sulphide mixtures occurred at more active potentials than those obtained in pure 0·6M NaCl. The pitting potential (Epit) of type 904L SS in 0·6M NaCl with 3 × 10-3M Na2S decreased with increasing temperature in the range 50–70°C. The value of Epit did not change in acidic chloride-sulphide solutions (pH 3–6), but it became more noble in alkaline chloride-sulphide solutions (pH 8–12). Observations by SEM showed that the large pits formed on type 904L SS in 0·6M NaCl with 3 × 10-3 M Na2S contained some micropits and that there was intergranular attack.
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