| SHI Yun-fen,SUN Shu-sen,ZHANG Shi-long,WEI Jia-xin,WANG Lun,TAN Yu-qing.Application of Combined Protection of Sacrificial Anode and Applied Current in Buried Pipeline[J],48(8):286-295 |
| Application of Combined Protection of Sacrificial Anode and Applied Current in Buried Pipeline |
| Revised:August 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.08.038 |
| KeyWord:sacrificial anode external current quasi-solid electrolytes joint protection buried pipeline corrosion rate |
| Author | Institution |
| SHI Yun-fen |
1.School of Chemical Engineering, Northeast Electric Power University, Jilin , China |
| SUN Shu-sen |
1.School of Chemical Engineering, Northeast Electric Power University, Jilin , China |
| ZHANG Shi-long |
2.Huadian Weifang Power Generation Co., Ltd, Weifang , China |
| WEI Jia-xin |
1.School of Chemical Engineering, Northeast Electric Power University, Jilin , China |
| WANG Lun |
3.Jilin Songhua River Thermal Power Co., Ltd, Jilin , China |
| TAN Yu-qing |
1.School of Chemical Engineering, Northeast Electric Power University, Jilin , China |
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| Abstract: |
| The work aims to develop new devices and methods for sacrificial anodes and impressed current combined cathodic protection buried pipelines in view of the shortcomings of traditional cathodic protection in long-distance pipelines. Through independent optimization experiments of sacrificial anode and applied current, the best sacrificial anode material and dimensions and the voltage of the applied current were found. Meanwhile, excellent quasi-solid electrolytes were prepared in order to provide a stable operating environment for the device and built a joint protection device which was to be applied in buried pipelines to realize effective protection. In the experimental part of the sacrificial anode, the magnesium material with the best condition of 5 cm×5 cm was selected by comparing the protection effect of the pipelines. The corrosion rate of the pipeline was 2.936×10–3 mg/(min∙cm3), and the consumption rate of the anode was 0.135×10–3 mg/(min∙cm3). The current generated could reach 0.113 A at most, and the current tended to 0.07 A when it was stable. In the experimental part of the applied current, through the comparision of the protection effect of the pipeline, the best condition was 1 V power supply voltage, the corrosion rate of the pipeline was 2.150×10–3 mg/(min∙cm3) and the power consumption was the least. In the experimental part of quasi-solid electrolyte, the solvent, solute, gel and metal electrolyte were optimized to prepare a quasi-solid electrolyte with conductivity of 5.83 mS/cm and volatility less than 0.2%. The joint protection device was built under the optimal conditions. Compared with the traditional cathodic protection method, the consumption of the anode material was 1.875 g, and the anode consumption rate was 0.123×10–3 mg/(min∙cm3). The consumption rate decreased by 10% and the corrosion rate of the pipeline was 0.082×10–3 mg/(min∙cm3), reducing by about 300%. Thus, the power consumption during the protection process could be effectively reduced. The sacrificial anode and impressed current combined protection method can effectively protect the buried pipeline, and the protection index of the sacrificial anode and the applied current alone are obviously improved. |
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