PRECIOUS METAL-PLATED SWITCH CONTACT ELEMENT AND PREPARATION METHOD THEREFOR

摘要

A precious metal switch contact element prepared by plating resist, plating and etching processes. The plating resist process is implemented by printing a plating resist ink for which an exposure machine is not required. The plating process is implemented by electroplating or chemical plating of a precious metal. The etching process is implemented by using an etching solution containing a weak organic acid, a weak inorganic acid or an acidic buffering agent, the brightness of the etching is increased and measuring etching is avoided by means of a sulphur-containing compound, and the dust resistance performance and the oil resistance performance of a contact are increased by increasing the etching depth. A switch contact prepared by the present processes has advantages such as good electrical conduction reliability, excellent dust resistance and oil resistance, short contact bounce time, a long service life and low raw material costs.