| LIU Xin,ZHU Yi-chen,PEI Feng,ZHANG Shi-yu,LIU Guang-ming.Galvanic Corrosion Behavior of Q235 Steel-Red Copper in Acid Red Soil of Different Temperatures[J],47(9):157-162 |
| Galvanic Corrosion Behavior of Q235 Steel-Red Copper in Acid Red Soil of Different Temperatures |
| Received:June 11, 2018 Revised:September 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.09.021 |
| KeyWord:Q235 steel red copper galvanic corrosion acid red soil |
| Author | Institution |
| LIU Xin |
1.State Grid Jiangxi Electric Power Research Institute, Nanchang , China |
| ZHU Yi-chen |
2.School of Material Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| PEI Feng |
1.State Grid Jiangxi Electric Power Research Institute, Nanchang , China |
| ZHANG Shi-yu |
2.School of Material Science and Engineering, Nanchang Hangkong University, Nanchang , China |
| LIU Guang-ming |
2.School of Material Science and Engineering, Nanchang Hangkong University, Nanchang , China |
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| Abstract: |
| The work aims to study the acceleration effect and galvanic corrosion mechanism of Q235 steel-red copper in red soil with different temperatures. The environment of acid red soil with different temperatures was simulated by constant temperature and constant humidity box. The galvanic corrosion kinetics curves of the Q235 steel-copper were measured by weight-loss method. The zero resistance galvanometer (ZRA) was used to study the variation curves of the galvanic potential and galvanic current with the corrosion time. Microstructure, composition and phase of the corrosion products were analyzed with XRD, SEM/EDS, respectively. After 20 d of galvanic corrosion, the galvanic corrosion weight loss of Q235 steel at soil temperature of 20, 40 and 60 ℃ was 0.4276, 0.9432 and 1.4622 g/dm2 respectively, and the galvanic corrosion effect was 4.51, 2.90 and 2.56, respectively. Q235 steel exhibited local corrosion in the acid red soil. The corrosion products were mainly composed of FeO and Fe3O4, cemented with soil particles and the structure of the corrosion products was loose when the temperature was 20 ℃ and 40 ℃. The corrosion products were mainly composed of Fe3O4 when the temperature was 60 ℃ and the structure of the corrosion product was dense. As the corrosion time increased, the galvanic potential fluctuated and the galvanic current decreased. The galvanic current of Q235 steel-red copper at 60 ℃(71.1 μA) was lower than that at 20 ℃ (336 μA) for 20 days. The corrosion became worse as the temperatures of soil increased. In conclusion, the corrosion of Q235 steel is worse as the soil temperature is higher. In the later period of corrosion, the oxygen content in the soil with higher temperature is lower and the structure of the corrosion product is more compact, so the galvanic corrosion process is inhibited. |
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