What is the term for the breaking loose of small pieces of metal from coated surfaces?

Flaking refers to the process where small pieces of metal separate from a coated surface, often as a result of stress, wear, or degradation of the coating itself. This phenomenon can occur in various situations, such as when protective coatings fail due to environmental factors or when they become compromised through mechanical wear. In the context of powerplant inspections, recognizing flaking is crucial because it can indicate underlying issues that may lead to more significant damage or failure if not addressed promptly.

Brinelling relates to a specific type of surface deformation caused by excessive loads on bearings rather than pieces breaking off from a surface. Corrosion involves the gradual degradation of materials due to chemical reactions, typically with moisture or other elements in the environment, rather than distinct pieces detaching. Peeling generally describes a similar surface separation but is often used more in the context of paints or coatings under less severe conditions, rather than the more specific process of metal breaking loose. Hence, flaking is the most accurate term to describe the phenomenon of small metal pieces breaking away from coated surfaces.