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High-Temperature Hot Corrosion of Hot Isostatic Pressed CrMnFeCoNi HEA in Chloride Salts
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DOI：10.1016/j.mtla.2026.102830.png)
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Abstract
En 中文
This paper studies the high-temperature corrosion behavior of HIP-processed CrMnFeCoNi high-entropy alloys in 650-850°C NaCl-KCl molten salt after hot rolling treatment. The alloy exhibits a single-phase FCC fine-grained structure with an average grain size of 4.85μm and excellent microstructural stability. The hot corrosion results show that the corrosion severity of the alloy is significantly aggravated with increasing temperature and prolonged exposure time. The corrosion products gradually evolve from simple oxides to complex oxides containing spinel, accompanied by spallation, cracks, and pores in the corrosion layer. The mass loss rate reaches 11.85% at 850°C for 12h, and the hot corrosion activation energy is calculated to be 140.7kJ·mol-1. The oxidation/chlorination activity of the alloying elements follows the order Mn > Cr > Fe > Co > Ni, among which Mn and Cr are the main reactive elements. The "chlorine cycle" effect accelerates the corrosion process. The corrosion mechanism presents a staged evolution with temperature: progressive surface corrosion, matrix penetration damage, and synergistic internal oxidation-external corrosion. The Cr2O3 sublayer formed at 850°C provides a certain protective effect on the substrate. Compared with the as-HIPed high-entropy alloy, grain refinement induced by hot rolling increases the nucleation sites of corrosion products, facilitating the formation of a continuous and dense protective oxide scale and thus significantly reducing the corrosion rate. This work provides an experimental basis for the selection of high-temperature chloride molten salt service materials in the field of concentrated solar power.
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