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| EFFECT OF Cl- CONTENT ON CO2 CORROSION OF J55 STEEL |
| ZHANG Lei;GUO Dapeng;LU Minxu |
| School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083 |
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Abstract High temperature high pressure corrosion tests, microstructure observation and electrochemical tests were used to analyze the effects of Cl- content on the CO2 corrosion of J55 steel. With Cl- content increased up to 200 g/L in the solution, CO2 corrosion rate of J55 steel decreased, corrosion scale became much compact and localized corrosion not obvious. The primary rules of anodic and cathodic reactions do not change with the increase of Cl- content, although the pH of the solution and the cathode reaction rate decreased. The electrochemical impedance spectroscopy characters have three time-loops in dilute Cl- solutions, but the inductive arc disappeared in high Cl- content solutions.
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Received: 20 April 2007
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Corresponding Authors:
zhanglei
E-mail: zhanglei@mater.ustb.edu.cn
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