The gaseous test involves exposing contacts to corrosive gases during a thermal cycling or aging. The mechanism is corrosion when the defect site is a pore. Corrosion Migration Corrosion migration refers to the movement of corrosion products into the contact area from sites away from the contact interface. Such sites include contact edges and defects in the contact finish. Corrosion migration is of concern predominantly in environments in which sulfur and chlorine are present.
Humidity affects galvanic corrosion.
Fretting corrosion is the degradation mechanism. Key material properties are wet oxidation of the platings and base materials. Fretting Corrosion Tin is subject to fretting corrosion. Tin is resistant to surface corrosion in that protective oxide film forms on the tin surface that limits further corrosion of the tin. This oxide film does not affect contact resistance since mating of the connector disrupts it.