Corrosion Behavior of AlCoCrFeNi2.1 Eutectic High-Entropy Alloy in Sulfuric Acid Solution

doi:10.11900/0412.1961.2022.00237

Acta Metall Sin

2023, Vol. 59

Issue (12): 1644-1654 DOI: 10.11900/0412.1961.2022.00237

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Corrosion Behavior of AlCoCrFeNi_2.1 Eutectic High-Entropy Alloy in Sulfuric Acid Solution

HU Wenbin, ZHANG Xiaowen, SONG Longfei(

), LIAO Bokai, WAN Shan, KANG Lei, GUO Xingpeng(

)

School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China

Cite this article:

HU Wenbin, ZHANG Xiaowen, SONG Longfei, LIAO Bokai, WAN Shan, KANG Lei, GUO Xingpeng. Corrosion Behavior of AlCoCrFeNi_2.1 Eutectic High-Entropy Alloy in Sulfuric Acid Solution. Acta Metall Sin, 2023, 59(12): 1644-1654.

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Abstract

Several high-entropy alloys (HEAs), such as single-phase bcc HEA with high strength and fcc with high ductility have been developed over the past few decades. Eutectic HEA (EHEA), such as AlCoCrFeNi_2.1, consists of both fcc and bcc microstructure, imparting excellent mechanical properties. The recent research on AlCoCrFeNi_2.1 EHEA primarily focuses on its mechanical properties. However, corrosion resistance of AlCoCrFeNi_2.1 EHEA is rarely discussed, which is crucial for the application of new materials. This work investigates the corrosion behavior of AlCoCrFeNi_2.1 EHEA in 0.05 mol/L H₂SO₄ and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solutions using electrochemical evaluation, SEM, EDS, and XPS. The results indicate that Cl^- do not alter the semiconductor type of passive film on AlCoCrFeNi_2.1 EHEA, but they considerably affect the compactness. Cl^- change passive film properties by influencing the Al and Cr oxide contents; however, Ni is not affected by Cl^-. The Ni-Al-rich phase is preferentially dissolved in 0.05 mol/L H₂SO₄ solution, and pitting corrosion and selective dissolution occur in 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution.

Key words: eutectic high-entropy alloy localized corrosion passivation

Received: 12 May 2022

ZTFLH:

TG178

Fund: Guang Dong Basic and Applied Basic Research Foundation(2021A1515110560)

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	HU Wenbin
	ZHANG Xiaowen
	SONG Longfei
	LIAO Bokai
	WAN Shan
	KANG Lei
	GUO Xingpeng

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00237 OR https://www.ams.org.cn/EN/Y2023/V59/I12/1644

Fig.1 Microstructure of AlCoCrFeNi_2.1 eutectic high-entropy alloy (EHEA)

Fig.2 Cyclic polarization curves of AlCoCrFeNi_2.1 EHEA in 0.05 mol/L H₂SO₄ solution and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution (E—potential, i—current density)

Table 1 Electrochemical parameters of AlCoCrFeNi_2.1 EHEA

Fig.3 Nyquist plots (a) and Bode plots (b) of AlCoCrFeNi_2.1 EHEA in 0.05 mol/L H₂SO₄ solut-ion and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution (Inset in Fig.3a shows the electrical equivalent circuit of EIS. R_s—solution resistance, Q_dl—electrochemical response parameter of double electric layers, R_ct—^{the charge transfer resistance, L—inductance of adsorption species, R_L—inductance resistance)}

Table 2 Fitted electrochemical parameters for EIS of AlCoCrFeNi_2.1 EHEA

Fig.4 Potentiostatic polarization curves of AlCoCrFeNi_2.1 EHEA in 0.05 mol/L H₂SO₄ solution and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution at 0.1 V (vs SCE) (a) and 0.2 V (vs SCE) (b) (Insets show the partial enlargement of potentiostatic polarization curves)

Fig.5 Mott-Schottky (M-S) plots for AlCoCrFeNi_2.1 EHEA in 0.05 mol/L H₂SO₄ solution and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution (C^-2—space charge capacitance)

Table 3 Acceptor densities and donor densities for AlCoCrFeNi_2.1 EHEA after potentiostatic polarization for 2 h at different potentials

Fig.6 SEM images of AlCoCrFeNi_2.1 EHEA after immersion in 0.05 mol/L H₂SO₄ solution (a) and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution (b) for 25 d

Fig.7 EDS element mappings of AlCoCrFeNi_2.1 EHEA after immersion in 0.05 mol/L H₂SO₄solution (a) and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution (b) for 25 d

Fig.8 High resolution XPS spectra of AlCoCrFeNi_2.1 EHEA in 0.05 mol/L H₂SO₄ solution (a1-e1) and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution (a2-e2) after potentiostatic polarization at 0.2 V (vs SCE) for 2 h (%—peak area percentage)
(a1, a2) Al2p (b1, b2) Co2p_3/2 (c1, c2) Cr2p_3/2 (d1, d2) Fe2p_3/2 (e1, e2) Ni2p_3/2

Fig.9 Schematics of localized corrosion mechanism of AlCoCrFeNi_2.1EHEA in 0.05 mol/L H₂SO₄ solution (a1-a3) and 0.05 mol/L H₂SO₄ + 0.02 mol/L NaCl solution (b1-b3)
(a1, b1) before corrosion
(a2, b2) the form of metastable pitting
(a3, b3) selective corrosion (a3) and the form of stable pitting (b3)

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