Electrochemical analysis of H₂S corrosion on 13% chromium stainless steel

Rahman, Mohammed Abdul (2018) Electrochemical analysis of H₂S corrosion on 13% chromium stainless steel. Masters thesis, Memorial University of Newfoundland.

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Abstract

The chemical reactions between steel and a corrosive environment cause severe corrosion, which has become a significant concern for the oil and gas industry due to the increase in the number of oil field shutdowns and equipment failures as the exploration of sour oil fields has considerably increased in the last decade. This research studies the effect of the hydrogen sulphide (H₂S) environment on 13% chromium stainless steel, one of the most commonly used corrosion resistant alloy in the oil industry for sour oil fields containing hydrogen sulphide. The corrosion behaviour, including corrosion rates, the effect of environmental conditions and the formation of protective films, were examined during the study. A series of experiments was performed using the conventional electrochemical method to study the effects of temperature, pH and immersion time on the corrosion behaviour of 13% chromium stainless steel in the H₂S environment. Corrosion behaviour was monitored using the polarisation resistance technique. A scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) was used to conduct morphological characterization and X-ray diffraction (XRD) was used to study the crystal structure of corrosion products. This study shows that each environmental parameter has a significant impact on corrosion behaviour.

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