Galvanic Effect and Alternating Current Corrosion of Steel in Acidic Red Soil
Qi-Wei Wang,
Jun-Xi Zhang,
Yan Gao,
Nian-Wei Dai,
Yun-Xiang Chen,
De-Yuan Lin,
Xiao-Jian Xia
Affiliations
Qi-Wei Wang
Shanghai Key Laboratory of Material Protection and Advanced Material in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
Jun-Xi Zhang
Shanghai Key Laboratory of Material Protection and Advanced Material in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
Yan Gao
Shanghai Key Laboratory of Material Protection and Advanced Material in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
Nian-Wei Dai
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China
Yun-Xiang Chen
Electric Power Research Institute of State Grid Fujian Electric Power Company Limited, Fuzhou 350007, China
De-Yuan Lin
Electric Power Research Institute of State Grid Fujian Electric Power Company Limited, Fuzhou 350007, China
Xiao-Jian Xia
Electric Power Research Institute of State Grid Fujian Electric Power Company Limited, Fuzhou 350007, China
Alternating current (AC) corrosion behavior of carbon steel–copper couple in acidic red soil was studied by means of the electrochemical test, mass loss, X-ray diffraction (XRD) and scanning electron microscope (SEM) characterization. Mathematical models were established to expound the impacts of AC and galvanic effect on the corrosion mechanism. The results demonstrate that the corrosion rate of the galvanic couple is positively related to AC intensity. Galvanic effect and AC synergistically aggravate the corrosion of steel. The composition of α-FeOOH declines while γ-FeOOH is increased with AC interference. Based on the statistical model, the galvanic effect has a more significant influence on steel corrosion compared with AC.
