Oxidation of copper contacts will be severe in areas which contain?

The oxidation of copper contacts is particularly severe in areas that contain chemical fumes. This is because certain chemical fumes, such as those from sulfur compounds or chlorinated solvents, can react with copper to form cupric or cuprous oxides more rapidly than in clean air. These reactions can lead to the formation of a corrosive environment that accelerates the degradation of copper components.

Such chemical reactions not only lead to the oxidation of the copper itself but can also produce a layer of corrosion products that further impede electrical conductivity and can potentially lead to failures in electrical connections. Therefore, environments with chemical fumes pose a significant risk for the oxidation of copper contacts, necessitating the use of protective measures or materials to mitigate these effects.