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| Effect of AC Stray Current on Corrosion Behavior of X80 Pipeline Steel |
| Received:March 08, 2021 Revised:March 19, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.04.003 |
| KeyWord:acidic soil alternating stray current electrochemical impedance spectroscopy pitting |
| Author | Institution |
| WEI Bo-xin |
Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, University of Science and Technology of China, Hefei , China |
| XU Jin |
Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| GAO Li-qun |
Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| TAI Chuang |
Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| YU Chang-kun |
Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| SUN Cheng |
Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| WANG Zhen-yao |
Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
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| Abstract: |
| To study the corrosion mechanism of pipeline steel under the interference of alternating current (AC). Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization scanning (Tafel), and surface analysis techniques were used to study the corrosion behavior of X80 pipeline steel in acid soil environment under different AC current density (0 ~ 80 A/m2). In acid soil environment, the AC corrosion of X80 can be enhanced even with the AC current density of 10 A/m2, and the corrosion rate of steel increased with the increase of AC current density. The results showed that the corrosion current density of steel coupon in acid soil solution was 9.6 μA/cm2 without AC interference, however, it increased to 11.95 μA/cm2 when the 10 A/m2 AC was applied. When the AC current density increased to 80 A/m2, the corrosion current density was 2.25 times of that without AC. The weight loss further verified the electrochemical test results. When the AC current density increased to 80 A/m2, the corrosion rate was 3.5 times that of the non-interfered coupon. Pitting corrosion of X80 steel mainly occured in acid soil environment, and the AC stray current further enhanced the pitting corrosion of X80 steel. The electrochemical corrosion process of X80 steel is affected by the introduction of AC. In the positive half-cycle of AC, oxidation reaction occurs, while reduction reaction occurs in the negative half-cycle of AC. In the whole process of AC, the anodic oxidation of positive half-cycle is much greater than the cathodic reduction of negative half-cycle. |
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