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| EXPERIMENTAL STUDY OF CO2 CORROSION OF 3Cr PIPE LINE STEEL |
| GUO Shaoqiang 1, XU Lining 1, CHANG Wei 2, MI Yarong 3, LU Minxu 1 |
1. Institute for Advance Materials and Techonolgy, University of Science and Technology Beijing, Beijing 100083
2. CNOOC Research Institute, Beijing 100027
3. Northwest A&F University, Yangling 712100 |
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Cite this article:
GUO Shaoqiang XU Lining CHANG Wei MI Yarong LU Minxu. EXPERIMENTAL STUDY OF CO2 CORROSION OF 3Cr PIPE LINE STEEL. Acta Metall Sin, 2011, 47(8): 1067-1074.
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Abstract Linear polarisation resistance (LPR) was used to trace the corrosion rate of 3Cr pipe line steel during corrosion process. EIS and SEM were used to detect the structure of protective CO2 corrosion product films. The appearance and evolvement of the loose internal–layer with lower Cr/Fe ration which was observed by SEM, was analyzed by EIS. Amorphous corrosion product film grew from outside to inside with time. The increase of the Cr/Fe ratio and the thickness of the film cause the decrease of momentary corrosion rate. The chromic compound produced by a certainty Cr3+ concentration. When the pitting corrosion suppressed, high corrosion rate in the pit resulted in high Cr3+ concentration which would produce much chromic compound, and in this way, the development of the pit would be prevented.
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Received: 19 January 2011
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| Fund: Supported by National Science and Technology Major Project (No.2008ZX05056–02) |
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