采用pH为4.0的含氯腐蚀液及400 kV·m^-1交变电场模拟工业输电环境，研究了SO₃^2-浓度（0.005，0.01，0.02，0.05，0.1 mol·L^-1）对5052铝合金在交变电场中干湿交替环境下腐蚀行为的影响。结果表明：随着SO₃^2-浓度增加，5052铝合金的腐蚀质量增加、自腐蚀电位、溶液电阻、电荷转移电阻先增大后减小，自腐蚀电流密度、腐蚀速率则先减小后增大；当SO₃^2-浓度为0.005~0.01 mol·L^-1时，合金以点蚀为主，点蚀坑内开始出现成分为Al₂O₃、Al₂O₃·3H₂O的龟裂状腐蚀产物；随SO₃^2-浓度继续增加，合金表面腐蚀坑减少，与基体结合紧密的龟裂状腐蚀产物增多；SO₃^2-浓度为0.02 mol·L^-1时，合金腐蚀速率最小，腐蚀程度最低。

The corrosive solution containing chlorine with pH 4.0 and 400 kV·m^-1 alternating electric field were used to simulate the industrial transmission environment. The effect of SO₃^2- concentration (0.005,0.010,0.020,0.050,0.100 mol·L^-1) on corrosion behavior of 5052 aluminum alloy in alternating electric field with cyclic wet-dry condition was studied. The results show that with the increase of SO₃^2- concentration, the corrosion mass increment, free-corrosion potential, solution resistance, and charge transfer resistance of 5052 aluminum alloy increased first and then decreased, while the free-corrosion current density and corrosion rate decreased first and then increased. When the concentration of SO₃^2- was from 0.005 to 0.020 mol·L^-1, the main corrosion was the pitting corrosion, and cracked corrosion products of Al₂O₃ and Al₂O₃·3H₂O began to appear in pitting pits. When the concentration of SO₃^2- continued to increase, the corrosion pits on the surface of the alloy were reduced, and the cracked corrosion products being tightly bound to the substrate with composition of Al₂O₃ · 3H₂O were increased. The corrosion rate and degree of the alloy were both the smallest when the concentration of SO₃^2- was 0.020 mol·L^-1.