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Pitting susceptibility of UNS NO. 8904 stainless steel in bromide-sulphide solution

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Abstract

The effect of sulphide ion on the pitting corrosion behaviour of UNS* no. 8904 (904L) stainless steel (SS) in 0.6 M NaBr at 25 °C has been investigated by using potentiodynamic anodic polarization and electrochemical impedance spectroscopy techniques. The pitting potential, E pit, in 0.6 M NaBr + 10−2 M Na2S was more negative than that obtained in 0.6 M NaBr, and decreased with increasing temperature in the range 25–60 °C. Scanning electron microscopy observation showed that elemental sulphur formed on the steel surface before E pit was reached in 0.6 M NaBr + 10−2 M Na2S at 60°C. E pit of 904L SS pH independent in the pH range from 3–10 of 0.6 M NaBr + 10−2 M Na2S at 25 °C, while at high pH values the pitting was suppressed. The impedance measurements showed that the charge transfer resistance, R t, decreased with time, when the controlled potential became higher than E pit.

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  1. Department of Electrochemistry and Corrosion National Research Centre, Dokki, Cairo, Egypt

    E. A. Abd El Meguid

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Abd El Meguid, E.A. Pitting susceptibility of UNS NO. 8904 stainless steel in bromide-sulphide solution. Journal of Materials Science 33, 3465–3470 (1998). https://doi.org/10.1023/A:1013218320934

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