Abstract
Potentiostatic and potentiokinetic polarization measurements, mainly at 20 °C, have been made on 18Cr-18Ni-2Mo stainless steel specimens in H 2SO 4 solutions containing H 2S. This steel is subject to pitting corrosion in the potential range between −50 and + 200mV (nhe) which is close to the region of active metal dissolution. The occurrence of pitting is related to the incomplete passivity of the steel surface. Furthermore, the presence of H 2S has been found to be an essential condition in the formation of pits. Experiments relating pitting to pH, sulphate concentration, temperature and alloy composition, are described. Finally, an example of this type of pitting corrosion in the practice of rayon spinning is discussed.
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