| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Coatings for Wear and Corrosion Protection
|
| Presentation Title |
Cr Diffusion Coatings for Improved Metal Dusting Resistance of Ni-Cu Alloys |
| Author(s) |
Emma M. White, Clara Schlereth, Beyza Oeztuerk, Till Koenig, Jan-Phillip Roth, Katrin Jahns, Mathias Galetz |
| On-Site Speaker (Planned) |
Emma M. White |
| Abstract Scope |
For the energy (hydrogen) and petrochemical industries, carbonaceous atmospheres and temperatures between 400 and 800°C are common, which are prime conditions for metal dusting attack. Carbon deposition, ingress, supersaturation and nucleation as graphite eventually causes pit formation and catastrophic failure of components. Highly alloyed materials with coatings and surface treatments can significantly delay attack initiation. Alloying with Al, Cr, and Si can form protective oxide scales, while alloying with Sn or Cu catalytically inhibits attack. Here a combined approach is evaluated using a Cr diffusion coating on advanced Ni-30wt.%Cu alloys. A ~10µm thick Cr diffusion coating was demonstrated on both wrought and additively manufactured (AM) materials which were exposed at 550°C and 19 bar for up to 500h in an aggressive metal dusting atmosphere. Microstructural changes and attack mechanisms are compared for both coated and uncoated materials. The Cr coatings demonstrated drastically improved resistance against metal dusting attack. |