Surface treatment technology of low cost, uniform coating, providing the most flat welding pad surface, the surface of the lower ion pollution Only formed on the surface of the copper film, good heat resistance, after many times back to welding treatment still has excellent solder resistance, compatible with resonant (Lead - free) SMT process compatible with disposable type (No - Clean) SMT process, low temperature operation, increase the structure stability of the circuit board, chemical mild nature, do not attack against the welding green paint Heavy industry easy.