Article Dans Une Revue Corrosion Science Année : 2025

A mechanistic study on stress corrosion cracking of sensitized AA5083 in a simulated water level fluctuation zone: combined impedance analysis and tensile tests

Résumé

The stress corrosion cracking (SCC) susceptibility of sensitized 5083 aluminum alloy (AA) in the water level fluctuation zone is greatly affected by the immersed-exposed alternating time. Here, a novel device was established to simulate the SCC in the water level fluctuation zone with varying immersed-exposed alternating time. The SCC mechanism of sensitized AA5083 was investigated using slow strain rate tensile (SSRT) tests and electrochemical impedance spectroscopy (EIS) analysis combined with constant load tests. With the prolongation of the immersed-exposed alternating time from 1-1 to 120-120 min, the corrosion extent gradually increased and became stable due to the water evaporation, salt concentration, and abundant oxygen supplement in the thin electrolyte layer (TEL) on the alloy surface during the exposed process, which promoted the anodic dissolution of Mg-rich phase at the grain boundaries (GBs). Thus, the tendency of intergranular fracture increased under the stress, resulting in high SCC susceptibility. Combined effect of corrosion and stress led to the formation of more defective surface oxide film with double-layer structure in the water level fluctuation zone than that in the full immersion environment.
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dimanche 13 juillet 2025
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Dates et versions

hal-04882176 , version 1 (13-01-2025)

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Zhe Liu, Jiarui Wang, Zhenbo Qin, Da-Hai Xia, Yashar Behnamian, et al.. A mechanistic study on stress corrosion cracking of sensitized AA5083 in a simulated water level fluctuation zone: combined impedance analysis and tensile tests. Corrosion Science, 2025, 245, pp.112701. ⟨10.1016/j.corsci.2025.112701⟩. ⟨hal-04882176⟩
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