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| CORROSION ELECTROCHEMICAL BEHAVIOR OF ANTI--SULPHUR CARBON STEEL IN 3%NaCl SOLUTIONS CONTAINING CO2/H2S |
| ZHANG Zhenfei1;LIU Liewei1;LI Mingzhi2;HUANG Xuesong2;XU Donglin1 |
1.Institate of Functional Material & Environment Chemistry;Department of Chemistry; Huazhong University of Science and Technology;Wuhan 430074；
2. Oil Extraction Technique Academy of\par Zhongyuan Oil Field ;Puyang 457001 |
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Abstract The corrosion electrochemical behavior of anti-sulfur carbon steel in 3% NaCl solution containing CO2/H2S was investigated by mass loss test, potentiodynamic polarization curves, electrochemical impedance spectrum. The results showed that more quickly sulfuration film dissolved, more less was there sediment on the exterior of electrode with pH reduction at 30℃. In addition, reduction of pH makes product film turn into rich--sulfur from rich-iron and contents of Cr(OH)3 and Cr2O3 reduce，all which weaken protection of product film and then corrosion rate at pH=2 was more rapid than that when at pH=4. H2S could not accelerate to anode process of anti--sulfur carbon steel when pH=4 and H2S concentration was bigger than 100 mg/L，moreover electrode reactions still were self--catalyzed reaction of acid with increase of concentration of H2S.
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Received: 28 May 2007
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Corresponding Authors:
ZHANG Zhenfei
E-mail: zzflili@126.com
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