What type of corrosion forms between the contacting points of dissimilar metals?

Galvanic corrosion occurs when two dissimilar metals are in electrical contact in the presence of an electrolyte, creating a galvanic cell. This type of corrosion is driven by the electrochemical potential difference between the two metals. One metal acts as the anode and corrodes while the other acts as the cathode and is protected.

The process involves the transfer of electrons from the anode (which corrodes) to the cathode (which remains relatively intact), leading to accelerated corrosion of the anode. This is particularly relevant in aviation and other industries where different metals frequently come into contact, and understanding galvanic corrosion is crucial for proper material selection and protection strategies.