Silver plating method for electric contact

Abstract

The invention discloses a silver plating method for an electric contact. The silver plating method for the electric contact includes the following steps that firstly, surface oil removing and rust removing treatment is performed on the electric contact, and cleaning and drying are performed; secondly, the electric contact is placed in a plating chamber, then the plating chamber is vacuumized to 10<-5>Pa to 10<-4>Pa, then argon gas is introduced, and the vacuum degree is kept smaller than 2Pa; thirdly, a pulse Ag target power source and a pulse negative bias power source are started to performion bombardment cleaning on the electric contact; fourthly, the gas discharging current density of a cathode is adjusted to be in micro arc discharging, silver plating is performed through a micro arcion plating method with the current density larger than 0.1 A / cm<2> and smaller than 1 A / cm<2>, and the silver plating time is 1-2 h, and the silver plated electric contact is obtained; and fifthly,temperature lowering and cooling are performed, and after temperature lowering along a furnace is performed till room temperature is achieved, the silver plated electric contact is taken out. Silver plating treatment is performed on the electric contact through the micro arc ion plating method, and the beneficial effects of environment friendliness, better clad layer binding force, high efficiencyand the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of electric contact manufacturing, and in particular relates to a silver-plating method for electric contacts. Background technique [0002] High-voltage circuit breakers and isolating switches are the most important components in power systems. Electrical contacts are indispensable electrical contact devices for high-voltage switches such as circuit breakers and isolating switches. It is extremely important to have high reliability. In order to reduce the contact resistance, the contact part of the conductive contact is plated with a layer of silver by electroplating to prevent oxidation of the contact and improve conductivity. Since the contacts of the switchgear have a "self-cleaning" function during operation, that is, the surface needs to be self-cleaned by friction when the contacts are closed. strength is especially important. [0003] Silver coating is a kind of precious metal coating. As a functio...

AI Technical Summary

Problems solved by technology

[0004] At present, the most common silver plating process for electrical contacts is silver electroplating, which adopts the method of rack plating with cyanide plating solution, and has the following problems: (1) rack plating is suitable for single-piece and small-batch production, and the production efficiency is low; (2) it is limited by the process and The pre-plating treatment is limited, the bonding force of the coating is unreliable, and the coating will fall off during the friction process; (3) The process of electroplating silver is carried out in the electroplating solution of cyanide. environmental pollution