Which of the following best describes galvanic corrosion?

Galvanic corrosion is characterized by an electrochemical reaction that occurs when two dissimilar metals are in electrical contact while immersed in an electrolyte, such as water. This reaction leads to the more anodic (less noble) metal corroding faster than it would if it were isolated, while the more cathodic (more noble) metal is protected from corrosion.

In practical terms, whenever two different metals are electrically connected and exposed to moisture or some other conductive medium, the electrochemical process initiates. The anodic metal donates electrons and oxidizes, resulting in corrosion, whereas the cathodic metal receives the electrons and remains intact. This phenomenon is particularly relevant in avionics and aerospace applications, where different metal components frequently come into contact in environments that include moisture.

Understanding galvanic corrosion is crucial for the design and maintenance of aircraft and other systems using multiple metals, as it can lead to significant structural damage if not managed properly. Recognizing the conditions that lead to this type of corrosion is essential for implementing effective corrosion prevention strategies.