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PITTING ELECTROCHEMICAL BEHAVIORS OF DIFFERENT MICROSTRUCTURE X80 STEEL IN HIGH pH SOIL SIMULATIVE SOLUTION |
HUANG Feng1;2; QU Yanmiao1; DENG Zhaojun1;3; LIU Jing1;ZHENG Chaochao1; LI Xiaogang2 |
1. College of Materials Science and Metallurgical Engineering; Wuhan University of Science and Technology; Wuhan 430081
2. Corrosion and Protection Center; University of Science and Technology Beijing;Beijing 100083
3. Wu Gang Corp. Iron and Steel Research Institute;Wuhan 430080 |
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Abstract The different microstructure of X80 steel was obtained by heat treatment, water quenching and air cooling. The pitting electrochemical behavior of X80 pipeline steel with three different microstructure in 0.5 mol/L Na2CO3+1 mol/L NaHCO3 high pH soil simulative solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The results indicated that the corrosion inhibition of X80 steel after heat treatment became worse compared with original microstructure, but passivated easily;the law of Rp and n of three microstructures steel varying with potential is same, and n is bigger or lower in different potential ranges; the difference of microstructure caused by heat treament and the uniformity of passive films should be responsible to the different electrochemical behavior. The conclusion from potentiodynamic polarization curve is the same to the conclusion reached by electrochemical impedance spectroscopy.
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Received: 29 July 2009
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Corresponding Authors:
LIU Jing
E-mail: wkdliu@126.com
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