After the Spring probe (pogo pin) connector is processed by a precision CNC machine tool, in order to improve the Spring probe (pogo pin)'s electrical conductivity, wear resistance, welding strength, oxidation resistance, corrosion prevention, etc., it is necessary to wear it. Piece protective cover-"Plating"; today I will introduce the characteristics of different plating materials and the properties of the plating materials used in Spring probe (pogo pin) connectors.
Spring probe (pogo pin)
Three types of tin plating: pre-tin plating; pre-cladding layer; electroplating.
The characteristics of tin: tin is relatively soft, protective to prevent corrosion, relatively cheap, easy to solder, the thickness of the plating layer is 2-12μ
Color: silvery white, dark or shiny.
The temperature resistance of tin-plated brass or bronze is 110 degrees, and tin-plated steel can reach 190 degrees.
Gold electroplating is the best quality coating method for electrical contacts. It is soft, very corrosion-resistant, insoluble in pure acid, has good conductivity, and is more expensive. Therefore, the selective gold plating process is more reasonable, that is, only in the meshing range. Gilded.
Gold plating usually chooses nickel plating first to achieve better anti-corrosion effect.
Gold plating thickness is generally
The precious metal palladium is used for electroplating instead of gold in some limited areas, AMP only uses palladium in the metal solder layer (hard gold method)
The conductivity of palladium is worse than that of gold.
Relatively precious, silver-white metal, poor conductivity, hard, smooth surface, often used for the bottom plating of gold plating, poor weldability, steel contacts are mostly nickel-plated (must be copper-plated), copper nickel-plated can withstand temperature of 340 degrees , Brass and bronze can reach 250 degrees.
Glossy white, precious metal, soft, good conductivity, easy to inert oxidation, so easy to lose luster, brass or bronze tinned can withstand temperature of 110 degrees, copper can withstand temperature of 250 degrees.
Copper is often used for basic plating;
Tinned contacts improve solderability;
For better adhesion, steel chooses more copper plating.
Comparison of electrical properties, specific gravity and melting temperature of electroplating materials for Spring probe (pogo pin)