Exceptional high-temperature corrosion resistance of multi-component alloys via modulating Al and Nb
Source abstract
Abstract
The chemical compatibility of metallic materials with thermal transfer/storage media, which often involves aggressive working conditions (i.e., high-temperature, corrosive environments), challenges the safe operations of advanced and sustainable energy-related infrastructures. Here, we report the corrosion-oxidation behaviors of three multi-component alloys (MCAs) when exposed to a corrosive heavy-liquid metal condition ( i.e. , molten Pb at 650 ℃ with 10 −6 wt% oxygen dissolved). The two compositions, Al 0.36 Cr 0.67 FeNi 0.98 (HAl11) and Al 0.27 Cr 0.71 FeNi 1.16 Nb 0.17 (HAl8 Nb ), show excellent corrosion-resistance via passivating a protective oxide scale on the alloy surface. Further characterizations of the oxide layers differentiate their corrosion-oxidation mechanisms: a protective Al 2 O 3 oxide layer (with Cr and Fe segregation outmost) formed on HAl11 and a duplex oxide layer (outward growth of FeCr 2 O 4 /Cr 2 O 3 layer plus inward growth of an Al 2 O 3 layer) with internal oxidation on HAl8 Nb . Adding Nb improved the corrosion-oxidation resistance (“Nb-doping effect”) by enhancing the outward diffusion of metallic elements and promoting the rapid establishment of an alumina scale. Besides, the presence of AlNbO 4 , which was predicted by thermodynamics calculation, lying between the spinel and Al 2 O 3 formation, was also confirmed by experimental observations. Our findings advance the mechanistic understanding of MCAs’ performances in extreme conditions and provide novel strategies for designing corrosion-resistant alloys targeting aggressive application environments. • Corrosion behaviors of three multi-component alloys (MCAs) in oxygen-containing molten Pb at 650 °C were investigated. • Two compositions Al 0.36 Cr 0.67 FeNi 0.98 and Al 0.27 Cr 0.71 FeNi 1.16 Nb 0.17 show excellent corrosion-resistance. • The oxide layer formed is a two-layer or a three-layer structure. • Adding Nb (“Nb-doping effect”) improves the corrosion-oxidation resistance.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: High-Temperature Coating Behaviors · Intermetallics and Advanced Alloy Properties · High Entropy Alloys Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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