What must be applied to prevent galvanic corrosion between aluminum and copper conductors?

To prevent galvanic corrosion between aluminum and copper conductors, the application of aluminum joint compound is key. Galvanic corrosion occurs when two different metals, like aluminum and copper, are in contact with each other in the presence of an electrolyte, leading to the deterioration of the less noble metal—in this case, aluminum.

Aluminum joint compound provides a protective barrier that minimizes direct contact between the two dissimilar metals. It aids in creating a more stable and corrosion-resistant connection, allowing the aluminum to avoid significant degradation over time. This compound forms a layer that helps to equalize the electrochemical potential between the two metals, thus reducing the likelihood of corrosion.

Other choices, such as stainless steel connectors, silicone sealant, and rubber insulation, do not specifically address the chemical interactions between aluminum and copper that can lead to galvanic corrosion. Stainless steel may still cause similar corrosion issues if not properly treated, while silicone sealants and rubber insulation primarily offer physical protection rather than addressing the galvanic concerns.