Electrochemical Impedance Spectroscopy Analysis on Interface State and Corrosion Mechanism of 7050 Al-alloy Subjected to Cavitation Erosion in NaCl Solution

doi:10.11902/1005.4537.2024.359

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (5): 1196-1204 DOI: 10.11902/1005.4537.2024.359

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Electrochemical Impedance Spectroscopy Analysis on Interface State and Corrosion Mechanism of 7050 Al-alloy Subjected to Cavitation Erosion in NaCl Solution

XIA Da-Hai¹(

), PAN Chengcheng¹, GUO Yujie¹, HU Wenbin¹, TRIBOLLET Bernard²

1 School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
2 Laboratoire Interfaces et Systèmes Electrochimiques (LISE), UMR 8235, CNRS-Sorbonne Université, Paris, France

Cite this article:

XIA Da-Hai, PAN Chengcheng, GUO Yujie, HU Wenbin, TRIBOLLET Bernard. Electrochemical Impedance Spectroscopy Analysis on Interface State and Corrosion Mechanism of 7050 Al-alloy Subjected to Cavitation Erosion in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1196-1204.

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Abstract

Cavitation is the main cause of failure of Al-alloy propellers in seawater environment, and understanding the dissolution mechanism of Al-alloy under cavitation is crucial for suppressing cavitation erosion. Therefore, the electrochemical corrosion behavior of 7050 Al-alloy in conditions of cavitation erosion was studied by means of electrochemical impedance spectroscopy (EIS). Results show that capacitance arc in the high-frequency region is related to the surface oxide film impedance and Faraday impedance, the diffusion impedance arc in the mid frequency region is related to the diffusion process of Al³⁺ ions in the Al(OH)₃ film, and the inductance arc in the low-frequency region is related to the intermediate product Al $a d s +$ . Then the expression of Faraday impedance Z_F based on the kinetic model is deduced theoretically. The phase angle in the high-frequency region is not constant, and the impedance response of the oxide film under cavitation conforms to the Young model, indicating that its structure is relatively loose, and the resistivity of the inner layer of the oxide film is about 10¹⁰-10¹¹ Ω·cm. In addition, its thickness is about 0.58-0.96 nm, and gradually decreases with the prolongation of cavitation time.

Key words: cavitation erosion electrochemical impedance spectroscopy Young model kinetic model Al-alloy

Received: 31 October 2024 32134.14.1005.4537.2024.359

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(52031007)

Corresponding Authors: XIA Da-Hai, E-mail: dahaixia@tju.edu.cn

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	XIA Da-Hai
	PAN Chengcheng
	GUO Yujie
	HU Wenbin
	TRIBOLLET Bernard

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.359 OR https://www.jcscp.org/EN/Y2025/V45/I5/1196

Fig.1 Details of the electrochemical cell and the specimen fixture designed to implement a cavitation erosion condition: (a) schematic diagram of cavitation erosion experimental device, (b) photo of the horn tip, (c) photo of the working electrode for electrochemical measurements that was sealed in epoxy resin and fixed in the fixture by screw bolts, and the dimensions of 7050 Al-alloy specimens for electrochemical and nonelectrochemical tests (units: mm)

Fig.2 Cavitation erosion morphologies at center and outer ring of 7050 Al-alloy specimens for gap width of 1 mm, after 5 min cavitation erosion (a1, b1) morphologies of two typical regions, (a2, a3) local magnified images of the region 1and region 2 in Fig2a1, (b2, b3) local magnified images of the region 3 and region 4 marked in Fig.2b1

Fig.3 Polarization curve of 7050 Al-alloy under natural immersion and cavitation erosion corrosion conditions in 3.5%NaCl solution

Fig.4 EIS results of 7050 Al-alloy under natural imm-ersion and cavitation erosion corrosion conditi-ons in 3.5%NaCl solution: (a) Nyquist plots (b) Bode plots

Fig.5 Ohm resistance-corrected bode plot of 7050 Al-alloy under cavitation erosion in 3.5%NaCl solution

Fig.6 Electrochemical equivalent circuit of 7050 Al-alloy under cavitation condition in NaCl solution

Table 1 Fitting results of EIS given by Measurement model

Fig.7 Resistivity profile of the oxide layer on 7050 Al-alloy during cavitation in 3.5%NaCl solution

Fig.8 Concentration profile of Al³⁺ in the Al(OH)₃ diffusion layer

Fig.9 Nyquist diagrams of the 7050 Al-alloy electrode after 1 h (a), 2 h (b) and 4 h (c) cavitation erosion in 3.5%NaCl solution and the result of the fitting procedure with the model (Eqs. (30) and (33)) (Solid line)

Parameters	Unit	t = 1 h	t = 2 h	t = 4 h
ρ₀	Ω·cm^-1	1.02 × 10¹¹	8.74 × 10¹¹	1.41 × 10¹²
p	nm	0.96	0.754	0.58
λ	nm	0.141	0.0783	0.0378
R_e	Ω·cm²	9.61	9.50	9.50
δ	cm	1.31 × 10^-3	9.01 × 10^-4	1.26 × 10^-4
k₁	mol·cm^-2·s^-1	2.36 × 10^-4	1.234 × 10^-4	1.07 × 10^-4
b₁	V^-1	15.83	42.52	69.56
k₂	s^-1	1.08 × 10^-6	2.286 × 10^-6	2.67 × 10^-6
b₂	V^-1	9.06	40.06	124.03
k_-2	cm·s^-1	2.78 × 10^-3	6.466 × 10^-4	2.973 × 10^-4
b_-2	V^-1	76.11	267.29	132.67
β	mol·cm^-2	8.22 × 10^-4	2.917 × 10^-4	2.543 × 10^-4
1-θ	-	2.25 × 10^-6	4.88 × 10^-6	6.30 × 10^-6
$C A l 3 +$	mol·cm^-3	1.29 × 10^-7	1.00 × 10^-7	1.57 × 10^-8

Table 2 Parameters obtained from the regression of the EIS experimental data

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