Corrosion behavior of API X-80 steel in hydrogen sulfide environment at different temperatures

Abstract

The electrochemical behavior of API X-80 steel materials in 3.5% wt. of NaCI solution containing different concentration of H2S at different temperatures was studied. Potendiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were employed to characterize the corroded API X-80 steel surface. The result showed that the corrosion rate of API X80 steel materials increased with increasing temperature. Pitting was observed at lower temperatures, while cracks and sulfide layers were observed on the corroded steel surface as the temperature was increased. Displacement of Fe-oxide film with a non-protective iron sulphide film was found to be responsible for the pitting and corrosion of the API X-80 steel materials. 2016 by NACE International.