Galvanic corrosion is typically identified by corrosion concentrated at what location?

• A. Corrosion concentrated at joints between dissimilar metals
• B. Dissimilar metals in contact with electrolyte
• C. Uniform thinning across material
• D. Pitting near fasteners

Answer: (A)

Galvanic corrosion occurs when two different metals are in electrical contact in the presence of an electrolyte, forming a tiny galvanic cell. In aircraft structures, this shows up as corrosion concentrated at the interfaces where dissimilar metals meet—especially at joints or fastener points where different metals contact each other. That localized attack at metal-to-metal interfaces is the hallmark, unlike uniform thinning you’d see with general corrosion or pits caused by other mechanisms near fasteners.