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51316-7313-Effect of Iron Sulfide Deposits on Sour Corrosion of Carbon Steel

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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.

Product Number: 51316-7313-SG
ISBN: 7313 2016 CP
Author: Jon Kvarekval
Publication Date: 2016
Industry: Science of Corrosion
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The corrosive effects of iron monosulfide particles deposited on carbon steel surfaces were investigated in a series of autoclave experiments. The H2S and CO2 partial pressures were varied in the range of 1-20 bar. Experiments were run at temperatures in the range of 10-120 oC. The test solutions consisted of high-salinity brine (100 g/L NaCl, 0.0025 m bicarbonate) and low-salinity condensed water (0.1 g/L NaCl). The duration of the tests was typically 14 days. Both weight loss corrosion and localized corrosion data were obtained. The entire surfaces of the exposed coupons were scanned with a 3D profilometer, obtaining detailed data on localized corrosion morphology, pit frequency and pit depths. The presence of FeS deposits was found to significantly increase both weight loss and local penetration rates in experiments with high H2S/CO2 partial pressures (20-25 bar total). The results are discussed on the background of available literature.

Keywords: Sour corrosion, carbon steel, pitting, localized corrosion

 

The corrosive effects of iron monosulfide particles deposited on carbon steel surfaces were investigated in a series of autoclave experiments. The H2S and CO2 partial pressures were varied in the range of 1-20 bar. Experiments were run at temperatures in the range of 10-120 oC. The test solutions consisted of high-salinity brine (100 g/L NaCl, 0.0025 m bicarbonate) and low-salinity condensed water (0.1 g/L NaCl). The duration of the tests was typically 14 days. Both weight loss corrosion and localized corrosion data were obtained. The entire surfaces of the exposed coupons were scanned with a 3D profilometer, obtaining detailed data on localized corrosion morphology, pit frequency and pit depths. The presence of FeS deposits was found to significantly increase both weight loss and local penetration rates in experiments with high H2S/CO2 partial pressures (20-25 bar total). The results are discussed on the background of available literature.

Keywords: Sour corrosion, carbon steel, pitting, localized corrosion

 

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