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Meeting Materials Science & Technology 2020
Symposium High Temperature Corrosion and Degradation of Structural Materials
Presentation Title Metal Dusting of Ni-based Alloys at Elevated Pressure in Different Gas Compositions
Author(s) Clara Schlereth, Mathias Galetz
On-Site Speaker (Planned) Clara Schlereth
Abstract Scope Metal dusting is a high temperature corrosion mechanism characterized by carbon deposition and disruptive graphite formation. It is observed in gas mixtures of CO, CO2, CH4, H2 and H2O with carbon activities ≥ 1 and low oxygen partial pressures. In this study, different gas mixtures with the same carbon activity, but varying H2/H2O and H2/CO ratios were tested in order to evaluate the influence of each gas component on the mechanism. Exposures were performed at an elevated pressure of 18 bar to simulate industrial applications and shorten the time until pit initiation. Several commercial Ni-based alloys were exposed and characterized with SEM, EPMA and Raman spectroscopy. Formation of different oxide scales and carbon ingress into the material were studied.


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