Internal oxidation is a process that occurs in certain metals and alloys, particularly those that contain reactive elements such as aluminum or silicon. It involves the oxidation of the metal at or within its grain boundaries or internal structures rather than just on the surface. This can happen when the metal is exposed to an oxidizing environment, usually at elevated temperatures. In internal oxidation, oxygen or other oxidizing agents penetrate into the material, leading to the formation of oxides within the metal rather than a mere surface oxidation layer.
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