The history of pogo pin electroplating
Electroplating of gold began in 1838, created by the British in cyanide gold plating, mainly used for decoration. Pulse gilding and laser gilding appeared in the 1980s. Electroplating gold is divided into electroplating hard gold and water gold processes, the bath composition is basically the same, and there are some trace metals such as nickel, cobalt, iron, and other elements in the hard gold bath. At present, the circuit board gold plating is mainly a citrate gold bath, which is simple to maintain and easy to operate.
Electroplating gold has a history of more than two hundred years. The gold plating layer has a golden yellow appearance, has outstanding chemical stability, discoloration resistance, electrical conductivity, corrosion resistance, and oxidation resistance. Together with good solderability, low contact resistance, and excellent hot-press bonding function, it makes electroplating gold The coating can be used as a decorative coating, as well as a functional and protective coating. Therefore, electroplating gold is used in jewelry, wall clocks, handicrafts, electronics, instruments, meters, aviation, aerospace, and other industries.
Most of the gold electroplating process used contains cyanide. The traditional cyanide gold plating solution is stable and reliable, has high current efficiency, has outstanding dispersing ability and covering ability, and the plating layer is detailed and shiny and has good adhesion. However, cyanide is harmful to the environment and the human body. With the increase in environmental protection requirements, the plating solution is developing in the direction of cyanide-free and environmental protection. The cyanide-free gold plating process replaces the cyanide-containing process is the general trend.
The electroplated gold coating has strong corrosion resistance, good electrical conductivity, is easy to weld, has high-temperature resistance, and has a certain wear resistance (such as hard gold mixed with a small number of other elements), and has outstanding discoloration resistance. At the same time, there are many gold alloy coatings A variety of shades, gold-plated on the silver can prevent discoloration. Electroplating of parts requiring long-term stability of electrical parameters, such as electronic tube cases and electrical contacts. As a decorative coating, gold plating is also used for electroplating jewelry, wall clock parts, works of art, etc.