Take a look at plating loads on connectors

Also important is the ability to apply a uniform plating to the gold coating with the proper loading. Vibration and shock resistance of wire-to-board connectors is an important performance of electrical connectors, which is particularly important in special application environments, such as aviation and aerospace, railway and highway transportation, and it is an important index to test the robustness of mechanical structure and electrical contact reliability of electrical connectors. There are clear provisions in the relevant test methods. The peak acceleration, duration, and shock pulse waveform, as well as the time of interruption of electrical continuity, shall be specified in the shock test. Other environmental properties of board-to-board connectors Other environmental properties of electrical connectors include sealing (air leakage, liquid pressure), liquid immersion (resistance to deterioration of specific liquids), low air pressure, etc., depending on the requirements of use. Whether the selection is still shivering plating barrel plating method, plating a few when the amount is less than the above limit load, conductive coating is simply a negative impact on the plating process, and coating uniformity will always be significantly affected, participate in some of the accompanying plating to ensure that the plating midway shut together also promotes uniform plating turnover. When the load is large, the replacement position of the plating or vibrating screen drum is not sufficient, and a part of the plating layer is always in a high current density state, while other parts are always kept in a low plating current density state, resulting in uneven coating after plating. Therefore, the general rule of electroplating production plant scale is the loading of each bath during the electroplating process. The following principles are selected through electroplating loading: 1. The plated parts can conduct electricity continuously in the drum or vibrating screen, and will not cause poor conductivity due to too little load; 2. In the drum or vibrating screen, the exchange state of the plated parts between positions is prominent; 3. The bearing capacity of the plated parts is generally 1/3 of the volume of the drum or vibrating screen, not more than 1/2.

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