Effect of Applied Load on Corrosion Behavior of 5383 Al-alloy Welded Joints

doi:10.11902/1005.4537.2024.213

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (2): 515-522 DOI: 10.11902/1005.4537.2024.213

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Effect of Applied Load on Corrosion Behavior of 5383 Al-alloy Welded Joints

ZHAI Xiwei¹^,²(

), LIU Shiyi², WANG Li¹, JIA Ruiling¹^,², ZHANG Huixia³

^1.School of Mechatronics Engineering, Zhongshan Polytechnic, Zhongshan 528400, China
^2.School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
^3.National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China

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ZHAI Xiwei, LIU Shiyi, WANG Li, JIA Ruiling, ZHANG Huixia. Effect of Applied Load on Corrosion Behavior of 5383 Al-alloy Welded Joints. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 515-522.

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Abstract

Corrosion behavior of 5383 Al-alloy and its welded joints was investigated in a nature seawater by applied different loads (50%R_el, 80%R_el, 100%R_el). Its stress corrosion behavior was assessed via a four-point bending device by applied constant load and electrochemical measurement. The results showed that the bare 5383 Al-alloy exhibited obvious passivation phenomenon, while no passivation for the welded joints. When the applied load was lower than the yield strength, the charge transfer resistance (R_ct) of the welded joints decreased by an order of magnitude compared to that without applied load. When the applied load was equal to the yield strength, R_ct decreased by two orders of magnitude. This is because when the load is increased up to the level of yield strength, not only the microstructure and stress state of the alloy are changed, but the surface passivation film is also difficult to form. Therefore, due to losing the protective effect of the passivation film, the corrosion may gradually propagate inward to the interior, resulting in an increase in the corrosion rate of welded joints of 5383 Al-alloy.

Key words: corrosion behavior Al-alloy welded joint passivation film

Received: 17 July 2024 32134.14.1005.4537.2024.213

TG172

Fund: Special Project in Key Fields of Universities in Guangdong Province(2024ZDZX3070);High-level Talent Research Project of Zhongshan Polytechnic(KYG2201)

Corresponding Authors: ZHAI Xiwei, E-mail: xiweizhai@163.com

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.213 OR https://www.jcscp.org/EN/Y2025/V45/I2/515

Table 1 Chemical compositions of 5383 aluminum alloy and 5183 filler metal

Fig.1 Schematic of four point bending loading

Fig.2 Nyquist (a), impedance module (b) and phase angle (c) plots of 5383 aluminum alloy welded joint under different stresses

Fig.3 Equivalent circuit diagram of EIS measurement for 5383 aluminum alloy welded joint under different applied loads

Table 2 Fitting results of EIS of 5383 aluminum alloy welded joint under different applied loads

Fig.4 Polarization curves of the base metal (a) and welded joint (b) of 5383 aluminum alloy under different applied loads

Table 3 Fitting results of polarization curves of the base metal and welded joint for 5383 aluminum alloy under different applied loads

Fig.5 Staged polarization curves of 5383 aluminum alloy samples under 50%R_el applied load: (a) not entering the passivation zone (Sample 1), (b) not entering the passivation zone (Sample 2), (c) before rapid increase in current after reaching the pitting potential (Sample 3), (d) including the whole zone (Sample 4)

Fig.6 Surface morphology of Sample 1 after polarization and EDS line scannings of Al and O

Fig.7 SEM images of two different surface regions (a, b) of Sample 2 after polarization test

Fig.8 Surface morphology of Sample 3 after polarization (a) and EDS line scannings of Al and O (b)

Fig.9 Surface morphology of Sample 4 after polarization (a) and EDS line scannings of Al and O (b)

Fig.10 Surface Mott-Schottky curves of 5383 aluminum alloy under different applied loads

Fig.11 E_fb and N_a values of the passivation films formed on 5383 aluminum alloy under different applied loads

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