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| CORROSION BEHAVIOR OF CARBON STEEL IN HIGH PRESSURE CARBON DIOXIDE SATURATED NaCl SOLUTIONS CONTAINING HYDROGEN SULFIDE |
| Guomin Li;Liewei Liu; |
| 华中理工大学 化学系 |
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Abstract Using a self-made autoclave for corrosion testing and electrochemical measurements under high pressure conditions, the effects of temperature and hydrogen sulfide concentration on the corosion of varbon steel in high pressure CO2 saturated 3% NaCl solutions were studied by weight-loss method, electrochemical polarization technique, electron probe microscopy analysis (EPMA). Experimental results showed that temperature and hydrogen sulfide concentration had obvious effects on the corrosion rate, configuration and character of corrosion scales. The adhesivity and protectivity of corrosion scale formed at lower temperature (80℃) were poor. The rising of temperature accelerated cathodic and anodic process of corrosion reaction and at the same time increased corrosion rate. Dense iron carbonate filn was formed on steel surface at 120℃, which exhibited good adhesivity and protectivity. The corrosion rate of steel at 120℃ was only one fourth of that at 80℃. Electrochemical polarization indicated that at 120℃ cathodic process of corrosion reaction was accelerated, while the anodic process was restrained.At the lower temperature (80℃),both cathodic and anodic process of corrosion reaction were accelerated and the corrosion rate increased with increasing the concentration of hydrogen sulfide. The cathodic process of corrosion reaction is restrained at the higher concentration of hydrogen sulfide.At the higher temperature (120℃),with increasing the concentration of hydrogen sulfide the corosion scale gradually changed from iron carbonate film to corrosion scale mainly made up of sulfur/iron compound.Electrochemical polarization indicated that cathodic process of corrosion reaction was acelerated but the anodic process was restrained.
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Received: 05 July 1999
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Corresponding Authors:
Guomin Li
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