Connector is electronic components industry in the important parts, electronic engineering and technical personnel must it is not difficult to find that: most of the connector are plating on a layer of special coating. Most people have a common heart of doubt, connector on the plating coating have any special meaning? Connector contact coating can not only protect connector reduce environment on the corrosion infestation, increase the durability of the connector and wear resistance ability, it can also from electrical performance to help establish and maintain the stable coupling impedance.
Connector use contact plating meaning connector is medical cables industry in the important parts, electronic engineering and technical personnel must it is not difficult to find that: most of the connector are plating on a layer of special coating. Most people have a common heart of doubt, connector on the plating coating have any special meaning? Professional connector production ShangJunAo connector engineer explained, connector contact coating can not only protect connector reduce environment on the corrosion infestation, increase the durability of the connector and wear resistance ability, it can also from electrical performance to help establish and maintain the stable coupling impedance. Specific displays in:
1, connector coating anti corrosion protection function
Connector should first consider is corrosion protection most electric connector contact by shrapnel is made of copper alloy, copper alloy in typical electric connector work environment susceptible to corrosion, such as oxidation and vulcanization. In fact, contact coating is used to close contact with shrapnel and working environment off to prevent corrosion of copper. Of course, coating materials in the work environment must not be damage (at least in harmful range). As an important function of corrosion protection at the same time, optimization of the interface is to choose the appropriate contact coating material factors for consideration.
2, connector coating helps to improve the mechanical properties
And the mechanical properties of the main parameters that affect the durability of the coating or wear, and combining ability factor. These factors to consider, is in the same basic effect of two different view, namely multipoint contact interface in relative motion process of cold welding share. The most important mechanical properties including hardness, ductility and coating materials of the friction coefficient. All of these properties in coating material to the inner nature and the working process of the use and decide.
3, connector coating helps to improve the electrical properties
The optimization of electrical properties from below into consideration, which already exists and the formation of surface in contact coating film control. Electric connector electrical properties of a main demand is to establish and maintain the stable coupling impedance. To achieve this purpose, need a metal contact interface to provide such inherent stability. To establish such a contact interface need surface film can be in contact with the time to avoid or division. The two different choice has been clear about the precious metals and rare metals and the difference between ordinary metal.
4, connector use precious metal coating characteristics
In different extent, precious metal plating (such as gold, palladium and their alloy) its essence on the surface film it is free. For these coating for produce interface metal contact is relatively simple, because it just need to contact surface of the concomitant with in the mobile. It is usually very easy to implement. In order to maintain contact interface impedance stability, connector design requirements should pay attention to keep contact surface metal sex in order to prevent external factors such as pollutant, substrate metal diffusion and contact wear the impact.
5, connector use normal metal coating characteristics
Ordinary metal coating, especially tin or tin alloy, and its performance are natural covered with a layer of oxidation film. Tin contact coating effect, because this layer oxide easily destroyed in cooperation, so that metal contact is easy to be set up. Electric connector design requirements is guaranteed oxide film in the connector when combined fracture, and in electric even persistent device to ensure the effective period of contact interface will no longer be oxidation. Then oxidation corrosion, wear corrosion, is tin contact coating the main performance degradation mechanism. Silver contact coating had better be as common metal coating, because this coating vulnerable to sulfide and chloride corrosion. Due to the formation of the valve things usually put the nickel coating as common metal.