What is the definition of galvanic corrosion?

Galvanic corrosion occurs when two dissimilar metals are in contact in the presence of an electrolyte, such as water. This process leads to an electrochemical reaction where the more anodic metal (the one that is more likely to corrode) allows electrons to flow to the more cathodic metal, leading to accelerated corrosion of the anodic metal. This phenomenon is significant in various applications, such as in plumbing, marine environments, and anywhere metals come into contact with conductive fluids. Recognizing the interactions between different metals and their environments is crucial for preventing galvanic corrosion.

The other options do not accurately define galvanic corrosion; they pertain to other forms of corrosion or environmental influences that do not involve the principle of dissimilar metals in an electrolytic medium.