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03339 FORMATION OF MULTILAYER IRON SULFIDE FILMS DURING HIGH TEMPERATURE CO2/H2S CORROSION OF CARBON STEEL

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Product Number: 51300-03339-SG
ISBN: 03339 2003 CP
Author: J. Kvarekval, R. Nyborg, Hojin Choi
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An experimental programme has been carried out to assess the corrosivity of carbon steel exposed to high-temperature (120C) chloride-containing brine saturated with CO2 and H2S at H2S/CO2 partial pressure ratios between 0 and 0.6. The experimental work included characterisation of the corrosion product films forming under these conditions. Corrosion experiments were performed in a flow loop at a flow velocity of 10 m/s, corresponding to a wall shear stress of 130 Pa. High general corrosion rates above 30 mm/y without protective film formation were found when H2S was not present under the conditions tested in the experiments. In the H2S/CO2 solutions corrosion product films consisting of several layers of various iron sulfides, and in some cases iron oxide or carbonate layers, were formed. General corrosion rates were 30-40 mm/y at an H2S/CO2 ratio of 0 and about 1 mm/y at H2S/CO2 ratios between 0.2 and 0.6. However, slightly lower steady-state corrosion rates were recorded over time. Pitting corrosion took place at a H2S/CO2 ratio of 0.2. Keywords: Corrosion, carbon steel, CO2, H2S, iron sulfide
An experimental programme has been carried out to assess the corrosivity of carbon steel exposed to high-temperature (120C) chloride-containing brine saturated with CO2 and H2S at H2S/CO2 partial pressure ratios between 0 and 0.6. The experimental work included characterisation of the corrosion product films forming under these conditions. Corrosion experiments were performed in a flow loop at a flow velocity of 10 m/s, corresponding to a wall shear stress of 130 Pa. High general corrosion rates above 30 mm/y without protective film formation were found when H2S was not present under the conditions tested in the experiments. In the H2S/CO2 solutions corrosion product films consisting of several layers of various iron sulfides, and in some cases iron oxide or carbonate layers, were formed. General corrosion rates were 30-40 mm/y at an H2S/CO2 ratio of 0 and about 1 mm/y at H2S/CO2 ratios between 0.2 and 0.6. However, slightly lower steady-state corrosion rates were recorded over time. Pitting corrosion took place at a H2S/CO2 ratio of 0.2. Keywords: Corrosion, carbon steel, CO2, H2S, iron sulfide
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02296 CORROSION PRODUCT FILMS ON CARBON STEEL IN SEMI-SOUR CO2/H2S ENVIRONMENTS

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ISBN: 02296 2002 CP
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ISBN: 7313 2016 CP
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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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51318-10990-Localized Corrosion of Mild Steel under Iron Sulfide Layers in CO2/H2S Environment

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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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