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51318-11472-Investigation of the Lower Threshold Value of pH2S for Retardation of CO2 Pitting Attack

A series of experiments was conducted in a large-scale multi-phase flow loop to investigate the threshold level of H2S leading to localized attack on mild steel in CO2 saturated aqueous solution with 1%wt NaCl at 40°C.

Product Number: 51318-11472-SG
Author: Wei Yan / Bruce Brown / Srdjan Nesic
Publication Date: 2018
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A series of experiments was conducted in a large-scale multi-phase flow loop to investigate the threshold level of H2S leading to localized attack on mild steel in CO2 saturated aqueous solution with 1%wt NaCl at 40°C.The CO2 partial pressure was fixed at 8.0 bar in all test conditions and the H2S partial pressure was varied from 0.024mbar (3ppm) to 0.5mbar (60 ppm). The superficial liquid velocity was 0.8 m/s and the experiment duration was between 2 and 21 days. The experimental results revealed that when the H2S partial pressure was low and the saturation value for mackinawite was near unity, localized attack occurred. Using the methodology provided, the corrosion behavior in very low pH2S environments may be predicted according to the super saturation levels of mackinawite.

 

Keywords: low H2S corrosion; localized attack; threshold value; mild steel

A series of experiments was conducted in a large-scale multi-phase flow loop to investigate the threshold level of H2S leading to localized attack on mild steel in CO2 saturated aqueous solution with 1%wt NaCl at 40°C.The CO2 partial pressure was fixed at 8.0 bar in all test conditions and the H2S partial pressure was varied from 0.024mbar (3ppm) to 0.5mbar (60 ppm). The superficial liquid velocity was 0.8 m/s and the experiment duration was between 2 and 21 days. The experimental results revealed that when the H2S partial pressure was low and the saturation value for mackinawite was near unity, localized attack occurred. Using the methodology provided, the corrosion behavior in very low pH2S environments may be predicted according to the super saturation levels of mackinawite.

 

Keywords: low H2S corrosion; localized attack; threshold value; mild steel

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