About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Extensive Corrosion of Economizer Finned Tubes Made of SA 178 Grade A |
| Author(s) |
Pooyan Changizian |
| On-Site Speaker (Planned) |
Pooyan Changizian |
| Abstract Scope |
The investigation results indicated that, while evidence of localized corrosion was observed on the ID of the failed tube, the major wall thinning resulted from corrosion/oxidation on the OD of the tube. The XRD analysis on the sludge sample and EDX analysis on OD deposits revealed the presence of Sulfur-containing compounds. This indicated that the wall-thinning on the boiler tube OD can attributed to the reaction of Sulfur Trioxide (SO₃) present in the flue gas with moisture or water vapor. The reaction led to the formation of Sulfuric Acid, which condensed into liquid form on the tube surfaces when the temperature dropped below its dew point. This acidic condensation resulted in severe corrosion that leading to pitting and thinning of the tube walls over time. Additionally, particles (likely corrosion products) could be carried by the flue gas, causing abrasion damage on the fins/tube surfaces which contributed to additional material loss/thinning. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Characterization, Iron and Steel |