What is the term for lifting or flaking of metal due to corrosion residual product buildup?

Exfoliation refers to the lifting or flaking of metal surfaces, often as a result of corrosion where residual products accumulate. This phenomenon typically occurs in metals that have experienced significant corrosion processes, leading to the formation of layers that do not adhere well to the base material. As these layers develop, they can begin to separate from the underlying metal, creating a flaked or lifted appearance.

In the context of aircraft maintenance and repair, understanding exfoliation is crucial, as it can compromise structural integrity and safety. Addressing this issue often requires thorough inspection, removal of the affected layers, and application of protective coatings to prevent further corrosion development.

The other terms, while related to different types of wear or damage in metals, do not accurately describe the specific process of lifting or flaking due to corrosion. Granulation involves a different process associated with the formation of small particles, fretting is concerned with wear at contact surfaces, and galling involves the tearing of metal surfaces during mating, which does not align with the definition of exfoliation related to corrosion.