What is done to prevent oxidation and corrosion of aluminum alloy connectors?
Aluminum alloy connectors and screws are plated with both copper and tin so that direct contact of copper wire and aluminum is prevented. This prevents galvanic activity and prevents surface oxidation of the aluminum. Aluminum connectors are also commonly used with no plating for use with aluminum wire only. This is ideal where moisture is present. The use of air and moisture excluding “grease” fill and external covers or “boots” can provide an excellent all aluminum wire connection under a wide range of weather conditions and environments. Removal of the oxide layer on the unplated aluminum, immediately prior to use is usually recommended in this situation Standard IHI wire lugs are copper + tin plated and dual rated for copper and aluminum wire and intended for dry locations only.
