|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Effect of Alloying Elements (Cr and Al) in Nickel-based Alloys in Molten Sulfate Environments
||Kuldeep Kumar, Hojong Kim
|On-Site Speaker (Planned)
Extreme thermal and chemical environments in gas turbines cause premature failure of turbine materials due to hot corrosion. Contaminants in the fuel during combustion are converted to molten salt deposits composed of low melting alkali halides and sulfates. This study will report the interfacial degradation reactions at the substrate/molten sulfate interface using electrochemical techniques of linear polarization, impedance spectroscopy, and cyclic voltammetry, to elucidate the impact of alloying elements in controlling the degradation reactions at 700 °C. This study was guided by the hypothesis that the interfacial degradation behavior is dictated by electrochemical reactions due to the dissociation tendency of molten sulfates (Na<SUB>2</SUB>SO<SUB>4</SUB> → 2Na<SUP>+</SUP> + SO<SUB>4</SUB><SUP>2-</SUP>). The electrochemical corrosion properties will be correlated with exposure tests by characterizing corrosion products using SEM/EDS, XRD, and thermal analysis. Both the electrochemical and exposure tests were conducted in eutectic LiCl-KCl with the addition of 10mol% Na<SUB>2</SUB>SO<SUB>4</SUB> under reactive gaseous atmosphere (O<SUB>2</SUB>-0.1%SO<SUB>2</SUB>).
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)