EIS研究7050铝合金在NaCl溶液空蚀作用下的界面状态与腐蚀机制

doi:10.11902/1005.4537.2024.359

中国腐蚀与防护学报

2025, Vol. 45

Issue (5): 1196-1204 CSTR: 32134.14.1005.4537.2024.359 DOI: 10.11902/1005.4537.2024.359

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EIS研究7050铝合金在NaCl溶液空蚀作用下的界面状态与腐蚀机制

夏大海¹(

), 潘成成¹, 郭玉杰¹, 胡文彬¹, TRIBOLLET Bernard²

1 天津大学材料科学与工程学院天津 300350
2 Laboratoire Interfaces et Systèmes Electrochimiques (LISE), UMR 8235, CNRS-Sorbonne Université, Paris, France

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

引用本文:

夏大海, 潘成成, 郭玉杰, 胡文彬, TRIBOLLET Bernard. EIS研究7050铝合金在NaCl溶液空蚀作用下的界面状态与腐蚀机制[J]. 中国腐蚀与防护学报, 2025, 45(5): 1196-1204.
Da-Hai XIA, Chengcheng PAN, Yujie GUO, Wenbin HU, Bernard TRIBOLLET. Electrochemical Impedance Spectroscopy Analysis on Interface State and Corrosion Mechanism of 7050 Al-alloy Subjected to Cavitation Erosion in NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1196-1204.

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摘要:

空蚀是导致铝合金螺旋桨在海水环境失效的主要原因，厘清铝合金在空蚀作用下的溶解机理对于抑制空蚀十分关键。本文采用电化学阻抗谱(EIS)研究了7050铝合金在空蚀作用下的腐蚀电化学行为，高频区容抗弧与表面氧化膜阻抗和Faraday阻抗有关，中频区扩散阻抗弧与Al³⁺在Al(OH)₃膜中的扩散过程有关，低频区感抗弧与中间产物Al $a d s +$ 有关。从理论上推导出基于动力学模型的Faraday阻抗Z_F的表达式。高频区相位角不是常数，空蚀作用下氧化膜的阻抗响应符合Young模型，说明其结构较为疏松，氧化膜内层电阻率约为10¹⁰~10¹¹ Ω·cm。此外，其厚度约为0.58~0.96 nm，并随着空蚀时间延长而逐渐降低。

关键词 ：空蚀, 电化学阻抗谱, Young模型, 电极过程动力学模型, 铝合金

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

收稿日期: 2024-10-31 32134.14.1005.4537.2024.359

ZTFLH:

TG172

基金资助:国家自然科学基金(52031007)

通讯作者: 夏大海，E-mail：dahaixia@tju.edu.cn，研究方向为腐蚀科学中的人工智能方法与应用

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

作者简介: 夏大海，男，1984年生，博士，副教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.359 或 https://www.jcscp.org/CN/Y2025/V45/I5/1196

图1 空蚀测试电解池示意图

图2 7050铝合金在3.5%NaCl溶液中空蚀5 min后的空蚀形貌

图3 7050铝合金在3.5%NaCl溶液中自然浸泡和空蚀条件下的极化曲线测试对比结果

图4 7050铝合金在3.5%NaCl溶液中空蚀条件下的电化学阻抗谱测试结果

图5 图4b经欧姆电阻校正后的Bode图

图6 7050铝合金在NaCl溶液中空蚀条件下的电化学等效电路模型

表1 Measurement model 拟合得到的阻抗参数

图7 7050铝合金在3.5%NaCl溶液中空蚀1，2，4 h后表面氧化膜的电阻率分布

图8 Al3+离子在扩散层内的浓度分布曲线

图9 7050铝合金在空蚀条件下测得电化学阻抗谱与非线性回归结果的对比

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

表2 非线性回归拟合得到的参数

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