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| AC Stray Current Corrosion Law of Buried Steel Pipeline |
| WANG Xinhua1, YANG Guoyong1, HUANG Hai1, CHEN Zhenhua2, WANG Limei3 |
1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China;
2. Petrochina Pipeline R&D Center, Langfang 065000, China;
3. Beijing Municipal Administration School, Beijing 102627, China |
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Abstract A lab experimental platform was built to investigate the effect of the AC stray current on the corrosion of buried pipeline. The mathematical model which involved the AC current density, the damage area, soil resistivity, the interference voltage and the coating resistivity was established. The AC current density which would improve efficiency could be obtained indirectly from the model. By using CDEGS software, the distribution law of the parallel length, current rate, distance, soil resistivity and other aspects of AC interference along the pipeline was studied. The results showed that the damaged area, AC interference voltage, soil resistivity and coating resistivity had a significant impact on the AC stray current density. That is, the AC corrosion was small when the current density was lower than 3 mA/cm2; it showed a stronger effect when the current density was between 3 and 10 mA/cm2, and it corroded very heavily when the current density was higher than 10 mA/cm2.
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