| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in High-Temperature Oxidation and Degradation of Materials for Harsh Environments: A SMD and FMD Symposium Honoring Brian Gleeson
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| Presentation Title |
H-12: Effect of Simulated Ash Components on Breakdown of a Protective Chromia Scale Formed on Heat Resistant Steel |
| Author(s) |
Soichiro Sugiyama, Shigenari Hayashi, Suzue Yoneda, Takashi Furugaki |
| On-Site Speaker (Planned) |
Soichiro Sugiyama |
| Abstract Scope |
The breakdown behavior of a protective Cr2O3 scale that formed on the heat-resistant steels used for superheater tube in waste-to-energy boiler was investigated under a simulated ash deposit in air. The formation and growth of CaCrO4 layer was found to cause breakdown of a Cr2O3 scale and accelerate corrosion under the ash consisting of CaO+NaCl+KCl+CaCl2. Among two possible reactions CaCl2+Ce2O3 or CaO+Cr2O3 for a formation of the CaCrO4, it was confirmed that a CaCrO4 was formed under a CaO deposit without alkali salts, but accelerated corrosion was not occurred after breakdown of a Cr2O3 scale. The results indicated that breakdown of a Cr2O3 scale was caused by a CaCrO4 formation by a reaction with CaO, then accelerated corrosion was initiated due to chlorination by alkali salts. |