Pvd Coating Machine Precious Metal Coating Substitute Process, Reduce Precious Metal Consumption Using Electroplating Process Instead of Precious Metal. The more mature ones use ternary alloy electroplating instead of silver plating.

  (1) Ternary alloy instead of silver coating
       The copper-tin-zinc ternary alloy coating has a bright silver-white color and has better discoloration resistance than silver-plated. Therefore, connectors for external assembly in the electronic connector industry are generally used instead of silver-plated. At this time, the appearance is mainly used. The color is self-illuminating and not easy to change color, and the inner conductor is still silver-plated to ensure that the electrical conductivity is not greatly affected.
       The technological process of ternary alloy is as follows: self-checking, hanging, chemical degreasing, water washing, water washing, ultrasonic degreasing, hot water washing, water washing, acid etching, water washing, water washing, electrochemical degreasing, water washing, water washing, activation and water washing One water washing, one pre-copper plating, one water wash, one water wash, one activation, one acid copper plating, one water wash, one water wash, one ternary alloy plating, one pure water wash, one water wash, one hot water wash, one drying, one self-inspection, and one submission for inspection.
       (2) Electroplating copper instead of silver plating
       Another trend is to replace silver plating with pure copper plating, which is second only to silver in conductivity. The silver-substituting ternary alloy coating is similar to the silver layer in color, and the conductivity cannot be compared with the silver layer. At the same time, the ternary alloy still uses the cyanide electroplating system and needs to be heated, and the composition of the coating is difficult to control. Therefore, it is not suitable for occasions with high requirements for conduction, especially for components with high third-order intermodulation requirements of waveguide devices, and experiments have proved that pure copper plating can replace silver plating. If copper plating is used instead of silver plating for large-area microwave device products, the value of saving precious metals is very attractive. It can be seen from the table that when the DC resistance value of silver is lQ, copper is the closest to it, only 1.05Ω; the electrical conductivity is also very close, respectively, silver 6.17*10-7 S/m and copper 5.80 *10-7S/m. Therefore, it is completely feasible to use copper instead of silver as the conductive coating in terms of the conductivity index.