With the rapid development of electronic technology, the electromagnetic shielding requirements of various electronic equipment are becoming increasingly strict, especially in high-speed rail connectors, aircraft parts, etc., and the requirements in this regard are particularly prominent. In the traditional penta-acid passivation process, due to the good density of the passivation film, the film layer can self-repair, and the corrosion resistance is very good. It is widely used in the surface protection of high-speed rail connectors and aircraft parts, but its resistivity is high. Poor electrical conductivity limits its use as an electromagnetic shielding coating.
    High-speed railways are high-tech products independently developed and developed by China. In order to ensure the smooth flow of communication signals, the quality of electronic connectors is of paramount importance. The housing of high-speed rail connectors is usually made of aluminum alloy. This precision connector should be used stably under high temperature and high humidity conditions, and can provide a certain electromagnetic shielding function. It can meet these demanding requirements through the electroplating army green zinc process.
    Galvanized layer can be obtained through passivation in various colors, such as black, colored, and green. Among them, military green passivation has been valued for its unique decorative effect and excellent corrosion resistance. After that, an army green passivation film with good adhesion and excellent corrosion resistance can be obtained on the surface.
    The electromagnetic shielding performance of the connector shell is not only related to the connection method, shell material and thickness, but also closely related to the coating performance, especially the conductive performance. In general, the better the conductive performance of the coating, the better the shielding . The passivation process of the galvanized layer also directly affects the shielding performance of the connector and solves the aluminum alloy plating problem of the high-speed iron connector. The special processing technology enables the connector to have the following properties.
  1. Appearance: bright, dense, dark green, grass green, olive green
   2. Comprehensive force: under the condition of 200 ℃ ± 10 ℃, no foaming or peeling after 30 minutes baking
   3. Corrosion resistance: Through 200 hours of neutral salt spray test, the surface has no white corrosion products to generate high-speed iron connectors, aircraft parts, which are closely related to human life and safety. Potential safety hazards, therefore, it is necessary to select manufacturers with experience and technology for galvanizing.