PCB board surface treatment

　　PCB board surface treatment: oxidation resistance, tin spraying, lead-free tin spraying, gold sinking, tin sinking, silver sinking, hard gold plating, full board gold plating, gold finger, nickel palladium OSP: low cost, good solderability, strict storage conditions, short time, environmentally friendly process, good welding, and flatness.

　　Tin spraying: Tin spraying boards are generally multi-layer (4-46 layers) high-precision PCB templates, which have been used by many large domestic communication, computer, medical equipment, aerospace enterprises and research units. The connecting finger is a connecting component between the memory module and the memory slot, and all signals are transmitted through the connecting finger.

　　The golden finger is composed of numerous golden conductive contacts, and is called the "golden finger" because its surface is gold-plated and the conductive contacts are arranged like fingers. The golden finger is actually coated with a special layer of gold on the copper clad plate through a special process, because gold has extremely strong antioxidant properties and strong conductivity. However, due to the high price of gold, a large amount of memory is currently replaced by tin plating. Tin materials have been popular since the 1990s. Currently, the "gold fingers" of devices such as motherboards, memory, and graphics cards are almost all made of tin materials. Only some high-performance service devices/workstations will continue to use gold plating at the contact points of accessories, which is naturally expensive.