What color generally indicates the presence of galvanic corrosion?

The presence of galvanic corrosion is often indicated by a color change, and white is typically associated with the corrosion products of metals like aluminum and zinc when they corrode.

Galvanic corrosion occurs when two different metals are in electrical contact in the presence of an electrolyte, leading to one metal corroding preferentially over the other. The corrosion products are often white powdery residues or films, which can appear as white markings on the metal surfaces. This visual cue helps in identifying areas affected by galvanic corrosion, allowing for maintenance and preventative measures to be implemented.

While other colors may indicate corrosion or damage on certain materials, white is specifically linked to the types of oxidation associated with galvanic processes, making it the correct choice in this context.