Localized Corrosion Mechanism of 5083-H111 Al Alloy in Simulated Dynamic Seawater Zone

doi:10.11902/1005.4537.2023.140

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (4): 683-692 DOI: 10.11902/1005.4537.2023.140

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Localized Corrosion Mechanism of 5083-H111 Al Alloy in Simulated Dynamic Seawater Zone

DENG Chengman¹^,², LIU Zhe¹^,², XIA Da-Hai¹^,²(

), HU Wenbin¹^,²

^1.Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300350, China
^2.School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China

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Abstract

The localized corrosion of 5083-H111 Al alloy in a simulated dynamic seawater zone was investigated by open circuit potential (OCP) measurement, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results revealed that, in the simulated dynamic seawater, 5083-H111 Al alloy generated visible pitting corrosion caused by the intermetallic particles (IMPs). These IMPs were composed of Al-Fe phase and Mg-Si phase, Al-Fe phase acted as a cathode during the corrosion, forming a micro-corrosion cell with the surrounding Al matrix, accelerating the corrosion of the Al matrix. Mg-Si phase was firstly acted as anode, the selective dissolution of Mg in the Mg-Si particles results in a de-alloyed outer layer on the exposed surfaces and forms Si-containing phase, then the Si-containing phase acted as cathode, prompting pitting corrosion of Al matrix. The corrosion products generated on the surface of 5083-H111 Al alloy were Al(OH)₃, Al₂O₃·6H₂O and AlCl₃. These corrosion products provided a good protection to the Al matrix in the early stage of corrosion (1-36 d), resulting in a positive shift in OCP and an increase in the polarization resistance R_p. However, in the later stage of corrosion (36-56 d), the initial corrosion products were partially detached, leading to localized corrosion again at the detachment position, resulting in a negative shift of OCP and a sharp decrease in R_p. Finally, with the prolongation of exposed time, some IMPs detached from the corrosion pits, forming corrosion cavities.

Key words: 5083-H111 Al alloy dynamic seawater zone localized corrosion intermetallic particles electrochemical impedance spectroscopy

Received: 06 May 2023 32134.14.1005.4537.2023.140

ZTFLH:

O646

Fund: National Natural Science Foundation of China(52171077)

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

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DENG Chengman, LIU Zhe, XIA Da-Hai, HU Wenbin. Localized Corrosion Mechanism of 5083-H111 Al Alloy in Simulated Dynamic Seawater Zone. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 683-692.

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.140 OR https://www.jcscp.org/EN/Y2023/V43/I4/683

Fig.1 Microscopic corrosion morphologies for 5083-H111 Al alloy exposed to a simulated dynamic seawater zone for 36 d (a) and 56 d (b, c)

Fig.2 Pitting corrosion of 5083-H111 Al alloy exposed to a simulated dynamic seawater zone for 56 d caused by intermetallic particles (IMPs): (a) pitting corrosion and corrosion product film, (b) enlarged image of the part marked by black dashed frame in Fig.2a

Fig.3 Microscopic morphologies and elements distribution of IMPs in 5083-H111 Al alloy exposed to a simulated dynamic seawater zone for 56 d: (a) large-size of Al-Fe phase, (b) small-size of Al-Fe phase

Fig.4 Microscopic morphologies (a, b) of 5083-H111 Al alloy exposed to a simulated dynamic seawater zone for 56 d after removed the corrosion products and the EDS (c) corresponding to Fig.4b

Fig.5 Detachment of intermetallic compounds after 5083-H111 Al alloy exposed to a simulated dynamic seawater zone for 56 d: (a) complete detachment, (b) partial detachment

Fig.6 Morphologies of corrosion product film of 5083-H111 Al alloy after exposed to a simulated dynamic seawater zone for 56 d: (a) corrosion product film and oxide film, (b) detachment of corrosion product film

Fig.7 Microstructures of corrosion products of 5083-H111 Al alloy after exposed to a simulated dynamic seawater zone for 56 d: (a, b) lamellar and lath corrosion products, (c) enlarged of lamellar corrosion products, (d) enlarged of lath corrosion products

Fig.8 XPS results of corrosion products generated on the surface of 5083-H111 Al alloy after exposed to a simulated dynamic seawater zone for 56 d: (a) Al 2p, (b) O 1s

Fig.9 OCP of 5083-H111 Al alloy in a simulated dynamic seawater zone

Fig.10 Nyquist plots of 5083-H111 Al alloy tested in a simulated dynamic seawater zone

Fig.11 Equivalent circuit used for fitting EIS data

Time d	CPE_f		R_f10³ Ω⸱cm²	CPE_dl		R_ct10⁴ Ω⸱cm²	R_p10⁴ Ω⸱cm²	∑χ²
Time d	Q_f / 10^-6Ω^-1⸱cm^-2⸱s $n f$	n_f	R_f10³ Ω⸱cm²	Q_dl / 10^-6Ω^-1⸱cm^-2⸱s $n d l$	n_dl	R_ct10⁴ Ω⸱cm²	R_p10⁴ Ω⸱cm²	∑χ²
1	2.061	0.865	1.283	4.436	0.897	7.346	7.474	2.705×10^-2
16	11.42	0.894	0.721	10.731	0.919	9.398	9.471	2.029×10^-3
36	2.436	0.933	1.116	10.672	0.855	9.605	9.717	2.866×10^-2
56	1.981	0.987	0.413	9.570	0.840	6.216	6.257	4.264×10^-2

Table 1 EIS fitting parameters based on the electrochemical equivalent circuit

Fig.12 Schematic diagram of localized corrosion mechanism of 5083-H111 Al alloy in a simulated dynamic seawater zone

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