| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Computation Assisted Materials Development for Improved Corrosion Resistance
|
| Presentation Title |
First Steps Towards a Coupled Thermodynamic-kinetic Model to Predict Sulfate Deposit Induced Hot Corrosion of Aluminized Ni-based Superalloys |
| Author(s) |
Yaping Wang, Rishi Pillai, Elena Yazhenskikh, Michael Müller, Dmitry Naumenko |
| On-Site Speaker (Planned) |
Yaping Wang |
| Abstract Scope |
Engine components, e.g. turbine blades and vanes undergo acute hot corrosion attack during service, which limits their lifespan. The hot corrosion kinetics of Ni-based superalloys and coatings exposed to multicomponent sulphate systems are difficult to model due to the complexity of the problem.
In the present work, various alkali and alkaline earth sulphate mixtures were applied to the surface of an aluminized Ni-based superalloy. The hot corrosion tests were carried out at 600-1000 °C in air + 300 ppm SO2. A thermodynamic database of Na2SO4-K2SO4-MgSO4-CaSO4-NiSO4 system was developed using CALPHAD method and important transitions were validated by thermal analysis. The phase equilibria of the sub-systems of interest were assessed using the optimized database. Based on that, the metal loss rate was predicted by a simplified kinetic model. The modelling results were compared with the experimental results. |