|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Pitting Corrosion Behavior of Ni38Fe20Crx(MnCo)42-x High Entropy Alloys
||Sarita Sahu, Orion Swanson, Tianshu Li, Angela Gerard, John Scully, Pin Lu, James Saal, Gerald Frankel
|On-Site Speaker (Planned)
Developing a fundamental understanding of corrosion behavior is crucial for designing new high entropy alloys (HEAs) with improved performance and selecting them for specific applications. Single phase Ni38Fe20Crx(MnCo)42-x HEAs were designed by an Integrated Computational Materials Engineering (ICME) approach. The pitting corrosion behavior of these alloys was characterized in 0.6 M NaCl at room temperature. Pitting resistance decreased with a decrease in the chromium content in these alloys. Interestingly, even the HEAs with low chromium content exhibited passivity. Crystallographic pit morphology was observed in Ni38Fe20Cr6Mn18Co18, Ni38Fe20Cr10Mn16Co16 and Ni38Fe20Cr14Mn14Co14, indicating that pit growth was under charge-transfer/ohmic control. Metastable pitting was studied by chronoamperometry experiments at potentials below the pitting potentials of HEAs. Current density was observed to be almost constant with time and was potential dependent as the current density increased with increase in applied potential in Ni38Fe20Cr10Mn16Co16, Ni38Fe20Cr14Mn14Co14, and Ni38Fe20Cr22Mn10Co10, implying that metastable pits grew under charge-transfer/ohmic control.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume