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Influence of Alloying Elements on the Electrochemical Behavior of Cantor High Entropy Alloys in Chloride Solutions

Picture for Influence of Alloying Elements on the Electrochemical Behavior of Cantor High Entropy Alloys in Chloride Solutions
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Multi-principle element alloys (MPEAs) represent a new alloy development philosophy, where the base alloy has significant atom fractions of several elements. Among MPEAs, high entropy alloys (HEAs) are defined as alloys containing 5 or more principle elements. In 2004 Cantor et al. introduced Fe20Co20Cr-20Ni20Mn20 (H4Mn20), a 5-element equimolar HEA. It was found that this alloy formed a single FCC solid solution and solidified dendritically.

Product Number: 51323-18924-SG
Author: Emily Seto, Jing Liu, Haoxiang Wang
Publication Date: 2023
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FeCoCrNi-based high entropy alloys (HEAs) are often used as prototype model alloys and have been developed broadly through modifying or replacing constituents with other elements to serve in extremely harsh environments such as in nuclear and marine engineering. Most previous studies were focused on the microstructure, mechanical properties, and oxidation behavior of FeCoCrNi-based HEAs. To date, very little work has been published on the corrosion behavior of HEAs in aqueous environments. In this study, the corrosion behavior of Cantor HEAs, including Fe20Co20Cr20Ni20Cu20 (H4Cu20), Fe20Co20Cr20Ni-20Cu15Al5 (H4Cu15Al5), and Fe20Co20Cr20Ni20Cu10Al10 (H4Cu10Al10), also known as H4C alloys, are investigated in aerated 3.5 wt% NaCl solutions at room temperature via electrochemical measurements. A common stainless steel (UNS S30403), and the original Cantor HEA (Fe20Co20Cr20Ni20Mn20, H4Mn20) are also evaluated as comparisons. Results confirmed that the addition of Al into the FeCoCrNi-based HEA improves the general corrosion resistance of Cantor HEAs. Among all five alloys, H4Cu10Al10 has the best general corrosion resistance with the slowest cathodic kinetics. The main types of corrosion on these HEAs were interdendritic and pitting corrosion after anodic polarization. Polarization experiments and post-characterization revealed that although the H4C alloys exhibit low pitting potential and low resistance to pitting initiation, the formed localized corrosion was interdendritic corrosion rather than big pits. Overall, results indicate that there is no significant advantage of using Cantor HEAs over common stainless steel in terms of corrosion consideration in aqueous chloride environments.

FeCoCrNi-based high entropy alloys (HEAs) are often used as prototype model alloys and have been developed broadly through modifying or replacing constituents with other elements to serve in extremely harsh environments such as in nuclear and marine engineering. Most previous studies were focused on the microstructure, mechanical properties, and oxidation behavior of FeCoCrNi-based HEAs. To date, very little work has been published on the corrosion behavior of HEAs in aqueous environments. In this study, the corrosion behavior of Cantor HEAs, including Fe20Co20Cr20Ni20Cu20 (H4Cu20), Fe20Co20Cr20Ni-20Cu15Al5 (H4Cu15Al5), and Fe20Co20Cr20Ni20Cu10Al10 (H4Cu10Al10), also known as H4C alloys, are investigated in aerated 3.5 wt% NaCl solutions at room temperature via electrochemical measurements. A common stainless steel (UNS S30403), and the original Cantor HEA (Fe20Co20Cr20Ni20Mn20, H4Mn20) are also evaluated as comparisons. Results confirmed that the addition of Al into the FeCoCrNi-based HEA improves the general corrosion resistance of Cantor HEAs. Among all five alloys, H4Cu10Al10 has the best general corrosion resistance with the slowest cathodic kinetics. The main types of corrosion on these HEAs were interdendritic and pitting corrosion after anodic polarization. Polarization experiments and post-characterization revealed that although the H4C alloys exhibit low pitting potential and low resistance to pitting initiation, the formed localized corrosion was interdendritic corrosion rather than big pits. Overall, results indicate that there is no significant advantage of using Cantor HEAs over common stainless steel in terms of corrosion consideration in aqueous chloride environments.

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