About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
High Temperature Oxidation of Metals and Ceramics
|
Presentation Title |
Understanding Mixed Sulfate-oxide Induced Hot Corrosion of Alumina-forming Alloys |
Author(s) |
David Poerschke, Atharva Chikhalikar |
On-Site Speaker (Planned) |
David Poerschke |
Abstract Scope |
There is growing evidence that mixed cation, multi-anion (oxide-sulfate) deposits can accelerate alloy oxidation at temperatures well outside the temperature ranges of classical sulfate-induced hot corrosion. However, there is limited knowledge of the interplay between (i) alloy chemistry and associated minor thermally grown oxide (TGO) constituents, (ii) deposit chemistry, including the effect of changing cation ratio and sulfate content, and (iii) the gas atmosphere on the severity and nature of the hot corrosion process. This work systematically explored these factors to understand the features differentiating degradation caused by calcium sulfate from other deposit-induced degradation modes. Alloy coupons were oxidized in the presence of various deposit chemistries, and the samples were characterized using an automated image analysis approach to generate large datasets enabling quantitative differentiation of degradation modes. The insights emerging from the experiments can inform future alloy design strategies. |