Galvanic corrosion poses a real challenge in mixed-metal connections, especially between aluminium and copper, which we often see in electrical setups. This type of corrosion happens when two different metals touch each other and come into contact with an electrolyte, like moisture, forming an electrochemical cell. The less noble metal, like aluminium (the anode), tends to corrode fas... https://www.pioneerpowers.com/bimetallic-lugs-and-connectors.php