|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Surface Engineering IV
||Fluorine from Bad to Good in the Oxidation Behavior of Metallic Materials
||Alexander G. Donchev, Mathias Galetz
|On-Site Speaker (Planned)
Fluorine usually deteriorates the oxidation behavior of metallic materials leading to accelerated attack. This is caused by the formation of gaseous compounds which evaporate leading to metal loss. Under distinct conditions i.e., defined fluorine partial pressure at the surface of the component, fluorine can protect metallic components. For example, intermetallic TiAl alloys which usually form a fast-growing non-protective mixed oxide scale reveal protective alumina formation after optimized fluorine treatment. This so-called fluorine effect is based on the exclusive intermediate formation of aluminum fluorides which finally are oxidized to alumina during their outward diffusion through the natural grown oxide scale. In this paper results of high temperature exposure tests of different materials, Ti- and Ni-based, without and with fluorine treatment will be presented and discussed. Several fluorination methods can be applied. This will be explained in the view of the fluorine effect mechanism.
||High-Temperature Materials, Environmental Effects, Surface Modification and Coatings