温度对铜铝过渡板电偶腐蚀行为影响研究

Influence of Temperature on Galvanic Corrosion Behavior of Copper-aluminum Transition Plate

铜铝作为输电线路中重要的金属材料,在输电线路实际运行过程中,由于双金属发生电偶腐蚀而引发的设备损坏、电网大面积停电等事故,因此研究铜铝金属的电偶腐蚀机理是十分有必要的。本文模拟海洋工业大气环境从温度层面对铜铝过渡板电偶腐蚀的机理进行研究。在弱酸性的腐蚀溶液中,利用CHI650d电化学工作站测量铜铝过渡板在不同温度下的tafel极化曲线和交流阻抗谱图,以此来探究不同温度梯度(15,25,35℃)条件下铜铝过渡板电化学腐蚀机理以及腐蚀规律。实验结果证明:铜铝过渡板阴阳面积比为1∶1时在25℃的条件下耐腐蚀性最好,温度升高和降低都会不同程度地影响其腐蚀速率,降低其耐腐蚀性能。

Copper and aluminum are important metal materials in transmission lines.During the actual operation of transmission lines,equipment damage and large-scale power outages in the power grid caused by bimetallic galvanic corrosion occur.The corrosion mechanism is very necessary.In this paper,the mechanism of the copper-aluminum transition plate galvanic couple is studied from the temperature level by simulating the marine industrial atmospheric environment.In a weakly acidic corrosive solution,the CHI650d electrochemical workstation was used to measure the tafel polarization curve and AC impedance spectrum of the copper-aluminum transition plate at different temperatures,so as to explore different temperature gradients(15,25,35℃)electrochemical corrosion mechanism and corrosion law of galvanic couples composed of copper-aluminum transition plates under the conditions.The experimental results show that the copper-aluminum transition plate has the best corrosion resistance under the condition of 25℃when the ratio of yin and yang area is 1∶1.The increase and decrease of temperature will affect its corrosion rate and reduce its corrosion resistance to varying degrees.