Galvanic Corrosion Of Copper-Aluminum Transition Fittings In Power Transmission And Transformation Behavioral Research

Copper-aluminum transition fittings are widely used in power transmission and transformation equipment and facilities,and their corrosion seriously threatens the safe operation of power transmission and transformation systems.In this paper,the galvanic corrosion behavior of copper-aluminum transition clips under simulated industrial marine corrosion conditions was studied by weight loss experiments,electrochemical techniques and surface analysis techniques.In the simulated atmospheric corrosion solution,the change trend of corrosion potential and corrosion current of galvanic electrode with time is related to the copper-aluminum area ratio.The corrosion potential of the samples with the copper-aluminum area ratio of 2:1 and 1:1 generally showed a trend of changing in the direction of negative potential with time.The tendency to change in the direction of positive potential over time.The corrosion current of the samples with the copper-aluminum area ratio of 1:1 generally showed a decreasing trend with time;the corrosion current of the samples with the copper-aluminum area ratio of 2:1 and 1:2showed a general trend of prolongation with time.and increasing trend.The weight loss experiment results in simulated atmospheric corrosion solution show that the larger the copper-aluminum area ratio of the copper-aluminum transition plate,the faster the aluminum corrosion rate;when the area ratio is the same,in the range of 15-35 °C,the corrosion of aluminum at 25 °C is higher.lowest speed.This is consistent with the result that the AC impedance of the galvanic electrode is maximum at 25°C.The EDS and SEM analysis results of the surface of the sample after corrosion show that the aluminum side is corroded,and the corrosion products are mainly aluminum oxides,and the corrosion products cover the surface of the copper.The measurement results of the galvanic potential difference and the galvanic current during the galvanic corrosion process show that in the galvanic corrosion process,except for the samples with the area ratio of 1:1 and 2:1 at 35℃,with the prolongation of the corrosion time,The galvanic potential difference and the galvanic current gradually decrease;the larger the copper-aluminum area ratio,the larger the stable galvanic current Value.For the samples with area ratios of 1:1 and 2:1 at 35°C,the galvanic potential difference fluctuated greatly,and there was no tendency to gradually decrease with time.