Study on the Comparison of Corrosion Resistance Between CrFeCoNiMo High - Entropy Alloy and 304SS

 In order to study the corrosion resistance of CrFeCoNiMo high-entropy alloy, the high-entropy alloy Cr19Fe22Co21Ni25Mo13 was prepared by melting and casting technology. The cast microstructure, phase composition of the high-entropy alloy were studied, and the corrosion resistance between the high-entropy alloy and 304SS was compared. Results showed that the microstructure of the CrFeCoNiMo high-entropy alloy possessed a typical dendrite morphology, in which the dendrite was a typical single-phase FCC solid solution, while the interdendritic was a mixed solid solution containing a FCC phase and a FCC1 phase. Compared with 304SS under the same corrosion condition, CrFeCoNiMo high-entropy alloy had better corrosion resistance and lower corrosion rate in sulfuric acid, hydrochloric acid, nitric acid and sodium chloride solution. Besides, there was no obvious corrosion in the dendrite region of the high entropy alloy, but the corrosion in the interdendrite region was serious, which might be mainly caused by the crystal structure difference between the dendrite region and the interdendrite region.