The stability of the passive state of a Fe-23% Cr alloy in 1 N H 2 SO 4 solution at room temperature was studied as a function of the impurity-elements content and the heat treatment conditions, in particular, the quenching and ageing at 475°C (200 h) and 650°C (10 and 100 h). The alloys hyperfine structure was studied using Mössbauer spectroscopy. The observed cases of the passive state disturbance are explained by the solid solution separation (after the ageing at 475°C) and the chromium-based second precipitation during the quench cooling and ageing.
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Каспарова et al. (2008) studied this question.
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