What is galvanic corrosion?

Galvanic corrosion occurs when two different metals are in electrical contact in the presence of an electrolyte, typically due to moisture. This creates a galvanic cell where one metal (the anode) corrodes faster than it otherwise would, while the other metal (the cathode) experiences reduced corrosion. The corrosion process is driven by the differences in electrode potential between the metals, leading to the anode sacrificing itself to protect the cathode.

In this context, the reaction specifically takes place at the joint faces where the different metals make contact. This scenario highlights the importance of material selection and design in engineering applications to minimize corrosion and ensure durability over time. Understanding galvanic corrosion is crucial in preventing premature failure in structures and components that may face corrosive environments.