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Corrosion rate of mild steel and character of corrosion products in sour environments at temperatures from 20 to 200°C. H2S-H2O water chemistry model was developed. Then, H2S corrosion tests were done at 80, 120, 160 & 200°C - exposure time of 4 days.
The objective of this work was to determine the corrosion rate of mild steel and characterize the corrosion products in sour environments at temperature ranging from 80°C to 200°C. First a H2S-H2O water chemistry model was developed based on available literature for a closed system at high temperature. Then H2S corrosion tests were conducted at 80°C 120°C 160°C and 200°C with an exposure time of 4 days. Linear polarization resistance (LPR) and weight loss (WL) methods were used to measure the corrosion rates. X-ray diffraction (XRD) and scanning electron microscopy with X-ray microanalysis (SEM/EDS) were employed to characterize the corrosion products and surface morphology. The results show that the initial corrosion rates increased with temperature while the steady-state corrosion rates decreased with temperature. The corrosion product was comprised of two distinct layers. The inner corrosion product was always an iron oxide (probably Fe3O4) layer while mackinawite troilite pyrrhotite and pyrite were identified as the main components of the outer layer at 80°C 120°C 160°C and 200°C respectively. Pourbaix diagrams generated based on the analysis of water chemistry corroborated the experimental characterization of the corrosion products.
Key words: hydrogen sulfide, high temperature corrosion, iron sulfide, iron oxide
This paper addresses the challenges to provide example of engineering solutions through the use of corrosion resistant alloys and non metallic materials to maintain the integrity of flowlines and process equipment in severe sour service.
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The corrosive effects of iron monosulfide deposited on carbon steel surfaces were investigated in autoclave experiments. The H2S and CO2 partial pressures were 1 to 20 bar. Temperatures were 10-120 °C. The test solutions consisted of high-salinity brine and low-salinity condensed water. Typical duration was 14 days. Weight loss and localized corrosion data were obtained.
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