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| CORROSION BEHAVIOR OF NT80SS STEEL IN ENVIRONMENT OF HIGH CONTENTS OF H2S AND CO2 |
| LI Chunfu1; DENG Hongda1;2;CUI Shihua1 |
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Chengdu 610500
2. School of Metallurgical and Materials Engineering; Chongqing University of Science and Technology; Chongqing 401331 |
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Abstract Corrosion behavior and corrosion influencing factors(total pressure, temperature, corrosion time, Cl-, velocity of flow) of NT80SS casing steels were studied in simulating corrosion environment with high contents of H2S and CO2 in Luojiazhai Gas Field by loss weight corrosion, and corrosion scale was analyzed by potentiodynamically scan, electrochemical impedance spectroscope(EIS) and scanning electron microscope(SEM). The results show that 60 ℃ was the temperature at which corrosion rate of NT80SS steel was the lowest among temperatures tested in this paper. When the total pressure was 9 MPa or above it, corrosion rate at 120 ℃ was lower than that at 90 ℃. However, the total pressure was less than 9 MPa, the result is contrary. Corrosion rate was decreasing with time prolonging; Cl- promoted corrosion of steel. Corrosion rate increased with acce-\linebreak lerated velocity of flow. The electrochemical experiments show that: in the range of 30 ℃-120 ℃, Resistance performance and compact character of the corrosion scale formed at 60 ℃ was the most outstanding among those formed at others temperature, and the anodic polarization rate is high, so corrosion rate of the steel at 60 ℃ is the lowest.
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Received: 25 October 2007
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Corresponding Authors:
LI Chunfu
E-mail: lichunfu10@163.com
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