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Corrosion performance of 3%Cr steel in CO2 and CO2-H2S environments was investigated using high temperature and high pressure autoclave. Corrosion scales were characterized by x-ray powder diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy.
Corrosion performance of 3%Cr steel in CO2 and CO2-H2S environments was investigated using high temperature and high pressure autoclave. Corrosion scales were characterized by XRD, SEM and EDS. The existence of Cr element and H2S both reduced general corrosion rates of 3Cr steel compared with API X60 steel. Under CO2 and CO2-low H2S partial pressure environments, the Cr-rich layer on 3Cr steel played a decisive role in inhibiting corrosion due to the hydrolytic action of Cr3+ and the formation of chromium compound. Under CO2-H2S environment, 3Cr steel still exhibited higher corrosion resistance than carbon steel and would be a promising material option.
Key words: downloadable, 3Cr Steel, CO2-H2S corrosion, Corrosion scale, Mechanism
Mild steel specimens (API 5L X65) were pretreated to form a pyrrhotite layer on the surface using high temperature sulfidation in oil, then exposed to a range of aqueous CO2 and H2S corrosion environments, leading to initiation of localized corrosion.
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H2S corrosion mechanisms, specifically at high partial pressures of H2S (pH2S), have not been extensively studied because of experimental difficulties and associated safety issues. The current study was conducted under well-controlled conditions at pH2S of 0.05 and 0.096 MPa.
Experiments were carried out in a 7.5L autoclave with two combinations of CO2 partial pressure and temperature and different H2S concentrations. Corrosion behavior of specimens was evaluated using electrochemical measurements and surface analytical techniques.