First, gold deposition is also called gold melting, that is, the copper and gold on the surface of the base material are chemically reacted, and the other two are integrated. Its advantages are that it can make the welding effect more solid, bright and beautiful. Its disadvantages are that it is difficult to produce. Because of chemical reaction during production, it will produce related gases. Improper treatment will produce toxic gases, which will cause certain damage to the production environment.
The second is gold plating. As the name implies, gold plating is to spray a layer of gold on the surface of the substrate. Since there is no chemical combination of copper, the gold content on the surface is higher than that of gold deposit, and the gold is brighter, but the welding effect is not as good as that of gold deposit.
The third is tin plating. Just like gold plating, tin is used instead of gold. The melting point of tin is not as high as gold, the hardness is not as high as gold, the color is poor, and the welding effect is good.
The fourth is the anti oxidation process. It is also a chemical method, which can avoid or slow down the oxidation of pads under certain circumstances. It is the most widely used process in FPC surface treatment except for gold deposition.