What type of corrosion occurs when different metals are in contact in the presence of an electrolyte?

Galvanic corrosion occurs when two different metals are in electrical contact with each other and are exposed to an electrolyte, such as water or moisture. In this scenario, one metal acts as an anode and corrodes faster than it would if it were alone, while the other acts as a cathode and is protected. This process is driven by the electrochemical potential difference between the two metals, creating a corrosion cell that accelerates the deterioration of the anode.

Understanding galvanic corrosion is crucial in applications where different metals are used in close proximity, especially in aviation and maritime environments, where electrolytes from moisture, salt, or other contaminants can exacerbate the issue. Proper material selection and protective measures, such as coatings or isolation techniques, are essential to mitigate this type of corrosion.