What appearance characterizes Level 3 Rust?

Level 3 Rust is characterized by deep pitting along with dark red spots on the surface. This level of rust indicates a more advanced stage of corrosion that occurs when moisture and oxygen have penetrated the metal, leading to significant deterioration.

The presence of deep pitting suggests that the protective coatings, if any, have been compromised, allowing the underlying material to corrode more aggressively. The dark red spots indicate the rusting process, which is a clear sign of extensive oxidization and material loss. This information is crucial for assessing and making decisions about repair or replacement of affected materials, as deeper rust can compromise the integrity of the structure or object in question.

In contrast, red spots may suggest an earlier stage of rust formation, while white powder is typically associated with aluminum oxidation or a less severe corrosion process. Holes represent an even more advanced stage of material failure which may be a consequence of Level 3 Rust if not addressed promptly, but Level 3 itself is defined by the combination of deep pitting and dark red staining.