Hot corrosion of nickel aluminide and iron aluminide intermetallic compounds.

摘要

Oxidation, mixed oxidation-sulfidation and hot corrosion of ductile nickel aluminide (Ni;The hot corrosion kinetics shows that Fe;Hot corrosion of all aluminides is significantly more severe than oxidation and mixed oxidation-sulfidation. This can be attributed to possibly the following two factors. Firstly, aluminide sulfide is formed at the interface of metal-salt, as a result of high sulfur potential in molten salt at the oxide-metal interface. Secondly, since the molten salt covers the specimen surface, the supply of oxygen through molten salt is much faster than the diffusion through solid oxide layer. Therefore, an accelerated oxidation-sulfidation occurs under the hot corrosion condition.