What does "thermal aging" refer to in the context of corrosion resistance?

Thermal aging refers to the changes in the properties of materials caused by exposure to elevated temperatures over time. As materials are subjected to high temperatures, their microstructure can evolve, leading to alterations in mechanical and corrosion-resistant properties. These changes can occur due to mechanisms such as precipitation of secondary phases, grain growth, or phase transformations.

Understanding thermal aging is crucial, especially in industries where materials are routinely exposed to high temperatures, as it can significantly influence the longevity and performance of metals and alloys in corrosive environments. The implications of thermal aging can include increased susceptibility to stress corrosion cracking or reduced resistance to oxidation, making it a vital consideration in materials selection and durability assessments.