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51318-11193-Corrosion Inhibition of Carbon Steel under Supercritical CO2/H2S Environment

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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.

Product Number: 51318-11193-SG
Author: Yoon-Seok Choi / Shokrollah Hassani / Thanh Nam Vu / Srdjan Nesic
Publication Date: 2018
Industry: Science of Corrosion
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The effect of small amounts of H2S on the corrosion behavior and corrosion protection of carbon steel was investigated in high pressure CO2 environments. The experiments were carried out in a 7.5L autoclave with two combinations of CO2 partial pressure and temperature (12 MPa/80oC and 8 MPa/25oC) with different H2S concentrations (0, 100 and 200 ppm). The corrosion behavior of specimens was evaluated using electrochemical measurements and surface analytical techniques. It was found that the addition of small amounts of H2S reduced the corrosion rate of carbon steel in high pressure CO2 environments. However, the corrosion rate was still higher than the targeted rate (< 0.1 mm/y). Additional protection was required in order to achieve the target. Utilizing 400 ppm of an imidazoline-type corrosion inhibitor reduced the corrosion rate of carbon steel below 0.1 mm/y in a high pressure CO2 condition with H2S. Compared to carbon steel, the corrosion resistance of low Cr steels was lower in the corresponding CO2 conditions with H2S.

Key words: Supercritical/liquid CO2, CO2 corrosion, carbon steel, low Cr alloy steel, corrosion inhibitor

The effect of small amounts of H2S on the corrosion behavior and corrosion protection of carbon steel was investigated in high pressure CO2 environments. The experiments were carried out in a 7.5L autoclave with two combinations of CO2 partial pressure and temperature (12 MPa/80oC and 8 MPa/25oC) with different H2S concentrations (0, 100 and 200 ppm). The corrosion behavior of specimens was evaluated using electrochemical measurements and surface analytical techniques. It was found that the addition of small amounts of H2S reduced the corrosion rate of carbon steel in high pressure CO2 environments. However, the corrosion rate was still higher than the targeted rate (< 0.1 mm/y). Additional protection was required in order to achieve the target. Utilizing 400 ppm of an imidazoline-type corrosion inhibitor reduced the corrosion rate of carbon steel below 0.1 mm/y in a high pressure CO2 condition with H2S. Compared to carbon steel, the corrosion resistance of low Cr steels was lower in the corresponding CO2 conditions with H2S.

Key words: Supercritical/liquid CO2, CO2 corrosion, carbon steel, low Cr alloy steel, corrosion inhibitor

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