Electrochemical corrosion in electric energy meters

In view of the current situation that the number of failures of electric energy meter is high due to electrochemical corrosion, the corrosion of electric energy meter is studied by visual inspection, metallographic profile analysis, surface SEM and EDS analysis and ion chromatography analysis in this paper, based on the principle of electrochemical corrosion and combined with the application enviroment. It is found that there is cracking in the three anti-paint at the solder joint where the electric energy meter is corroded. The DC power supply current flows through the copper pad to the solder joint, and other metals such as tin are easily accelerated to corrode as the anode; In the case of power-on, whether the anode end of the device is covered with three anti-paint is directly related to whether corrosion occurs. The research results in this paper have positive significance for reducing the electrochemical corrosion phenomenon of electric energy meter and optimizing the manufacturing process of electric energy meter.