Tin Dipping Immersion plating is the workpiece immersed in a solution containing metal salts, according to the principle of chemical replacement on the surface of the workpiece deposited metal coating. This is different from the general principle of electroless plating, because there is no reducing agent in the plating solution.
Contact plating is not the same, contact plating is the workpiece immersed in the metal salt solution must be closely linked with a lively metal, the active metal into the solution to emit electrons, the high potential of the metal ions in the solution is deposited in the surface of the workpiece. Tinned tin is only carried out on iron, copper, aluminum and their respective alloys.
Electroless Tin Plating No reduction agent for copper or nickel autocatalytic deposition can be used to restore tin. The simplest explanation is that because the surface of the tin is high in hydrogen electrolysis, and the reduction agent is the hydrogen reaction, it is impossible to restore tin ions to tin elemental. In order to electroless tin plating, we must choose another type of strong reducing agent, such as ti3+, v2+, cr2+, etc., only with the report of t3+/ti4+ department.