Corrosion behavior of a compositionally complex alloy utilizing simultaneous Al, Cr, and Ti passivation
Résumé
The corrosion behavior of the Al$_{0.3}$Cr$_{0.5}$Fe2Mn$_{0.25}$Mo$_{0.15}$Ni$_{1.5}$Ti$_{0.3}$ compositionally complex dual-phase alloy was explored in a variety of electrolytes. Comparable corrosion resistance to 316L stainless steel and Ni-Cr binaries was observed in NaCl despite lower Cr concentrations. Individual elemental fates during corrosion were identified by combinations of in-situ atomic emission spectroelectrochemistry and ex-situ X-ray photoelectron spectroscopy with high-resolution surface analysis and depth profiling. A potentiostatically grown passive film was enriched in Al(III), Cr(III), Ti(IV), and Mo(VI). Al-Ti and Cr-Ti layers were suggested but significant Al, Cr, and Ti mixing was present. Proposed benefits of Al-Cr-Ti coexistence are addressed.
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