| Title |
Corrosion of Fe-Al Alloys at 600 and 700 ℃ in a Gas Mixture of H2O, H2S, N2 |
| Authors |
(Min Jung Kim); (Dong Bok Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.6.406 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
metals; casting; oxidation; scanning electron microscopy; H2S corrosion; H2O corrosion |
| Abstract |
Fe-(4.8, 9.2, and 14.3 wt%)Al alloy were significantly corroded at 600 and 700 ℃ for up to 60 h in a mixed gas consisting of 0.031 atm of H2O, 0.0044 atm of H2S, and balance of N2. The Fe-4.8Al alloy corroded rapidly, forming outer FeS scales and inner (FeS, Fe2AlO4)-mixed scales. These were formed because the sulfidation of Fe to form FeS in the outer scales facilitated the oxidation of Al to Fe2AlO4 in the inner scales. The Fe-(9.2, 14.3)Al alloys formed much thinner scales, which consisted primarily of outer FeS scales and inner Al2O3 scales that effectively provided corrosion resistance.(Received May 9, 2014) |