Corrosion resistance of nonequiatomic FeNiCrMnAlx high entropy alloys in hexamine as inhibitor in 3.5% NaCl

Abstract

The corrosion performance of Fe35Ni20Cr12Mn(28−x)Al(5+x) high‐entropy alloys (HEAs) with varying aluminum (Al) content (x = 0, 5, and 10 at.%) was studied in a 3.5% NaCl solution. Additionally, different concentrations of hexamine inhibitors (0.1, 0.2, and 0.3 g) were employed to enhance the corrosion resistance. Polarization measurements were conducted using a three‐electrode electrochemical cell with a calomel reference electrode. Furthermore, polarization‐dynamics experiments were carried out at room temperature with a scan rate of 0.33 mV/s. The findings indicated that hexamine improved the corrosion resistance of the investigated HEAs. However, the effectiveness of hexamine decreased as the Al content increased up to 15 at.%. In the case of Fe35Ni20Cr12Mn18Al15 HEA with 0.3 g hexamine, the surface exhibited the presence of iron oxides. These results were confirmed through scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDX), and elemental mapping, which revealed the distribution of elements under different conditions.

Defects Act in an “Introverted” Manner in FeNiCrCoCu High-Entropy Alloy under Primary Damage

“…The structural properties and performances of high-entropy alloys are unique and interesting issues that have attracted intensive attention [1][2][3][4][5][6][7][8][9][10]. HEAs consisting of four or more elements with equal atomic concentrations are intriguing materials because of their excellent comprehensive properties as structural materials [2] which contribute to sluggish diffusion [3,7,9], critical internal lattice distortion [8,[11][12][13], and corrosion resistance [14][15][16]. More demands for nuclear energy are met using HEAs, which are considered promising materials for fusion and generation IV fission reactors [17][18][19][20].…”