Galvanic Corrosion Behavior for Galvanic Couple of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl Solution

doi:10.11902/1005.4537.2021.355

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 1016-1026 DOI: 10.11902/1005.4537.2021.355

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Galvanic Corrosion Behavior for Galvanic Couple of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl Solution

LIU Zeqi, HE Xiaoxiao, QI Kang, HUANG Hualiang(

)

School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China

Cite this article:

LIU Zeqi, HE Xiaoxiao, QI Kang, HUANG Hualiang. Galvanic Corrosion Behavior for Galvanic Couple of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 1016-1026.

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Abstract

The galvanic corrosion behavior for the galvanic pair of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl solution was studied by means of electrochemical methods and surface analysis techniques. For the galvanic pair of AZ91D Mg-alloy/2002 Al-alloy in the NaCl solution, Mg-alloy always acted as anode, thus its corrosion potential positively shifted, while corrosion rate increased. This could be attributed to that the galvanic effect between the two alloys significantly accelerated its cathode process. On the other hand, Al-alloy, always acted as cathode, its corrosion potential also positively shifted, and the corrosion rate increased. This could be ascribed to that the galvanic effect between the two alloys inhibited the formation of the passivation film on its surface. With the extension of immersion time, the coupling potential of the two alloys shifted towards positive first and then gradually negative, and finally reached a relatively stable state. The galvanic current densities increased first and then decreased and increased gradually again, and finally reached a relatively stable state. The research results not only enriched the knowledge of galvanic corrosion, but also provided a theoretical basis for the selection and design of automotive engine materials and the inhibition of the galvanic corrosion of multi-metal pairs.

Key words: AZ91D Mg-alloy 2002 Al-alloy galvanic corrosion SEM XPS

Received: 10 December 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51401151);Natural Science Foundation of Hubei Province(2018CFB525);Graduate Innovative Fund of Wuhan Institute of Technology(CX2021345);President Foundation of Wuhan Institute of Technology(XZJJ2021074)

About author: HUANG Hualiang, E-mail: 51032265@qq.com

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	Zeqi LIU
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https://www.jcscp.org/EN/10.11902/1005.4537.2021.355 OR https://www.jcscp.org/EN/Y2022/V42/I6/1016

Fig.1 Potential and potential difference of AZ91D Mg-alloy and 2002 Al-alloy with different time in 0.5 mg/L NaCl at 30 ℃: (a) potential at the beginning of 24 h, (b) potential of Mg-alloy at different soaking time under uncoupling and coupling conditions, (c) potential of Al-alloy at different soaking time under uncoupling and coupling conditions, (d) potential difference between Mg-alloy and Al-alloy at different soaking time under uncoupling and coupling conditions

Fig.2 Polarization curves of AZ91D Mg-alloy (a) and 2002 Al-alloy (b) immersed in 0.5 mg/L NaCl solution at 30 ℃ for 24 hours under the condi-tions of uncoupling and uncoupling after coupling

Table 1 Fitting parameters of polarization curves of AZ91D Mg-alloy and 2002 Al-alloy immersed in 0.5 mg/L NaCl solution at 30 ℃ for 24 h under the conditions of uncoupling and uncoupling after coupling

Fig.3 Nyquist (a, c) and Bode (b, d) diagrams of AZ91D Mg-alloy (a,b) and 2002 Al-alloy (c, d) immersed in 0.5 mg/L NaCl solution at 30 ℃ for 24 h under the conditions of uncoupling and uncoupling after coupling

Fig.4 Equivalent circuits used for fitting the tested EIS data for AZ91D Mg-alloy (a) and 2002 Al-alloy (b)

Table 2 EIS fitting parameters of AZ91D Mg-alloy and 2002 Al-alloy immersion in 0.5 mg/L NaCl solution at 30 ℃ for 24 h under the conditions of uncoupling and coupling

Fig.5 Nyquist (a, c) and Bode (b,d) diagrams of AZ91D Mg-alloy (a, b) and 2002 Al-alloy (c, d) immersed in 0.5 mg/L NaCl solution at 30 ℃ for different time under the condition of uncoupling after coupling

Table 3 EIS fitting paramaters of AZ91D Mg-alloy and 2002 Al-alloy with different immersion time under coupling condition in 0.5 mg/L NaCl solution at 30 ℃

Fig.6 Time dependence of coupled potentials (a) and galvanic current densities (b) between AZ91D Mg-alloy and 2002 Al-alloy in 0.5 mg/L NaCl solution for immersion 96 h at 30 ℃

Fig.7 SEM surface morphologies of AZ91D Mg-alloy immersed in 0.5 mg/L NaCl solution at 30 ℃ for 24 h under the conditions of uncoupling (a) and uncoupling after coupling (b)

Fig.8 SEM surface morphologies of 2002 Al-alloy under uncoupling (a) and coupling (b) conditions after immersion 24 h in 0.5 mg/L NaCl solution at 30 ℃

Fig.9 XPS of the surface film of AZ91D Mg-alloy under coupling condition after immersion 24 h in 0.5 mg/L NaCl solution at 30 ℃: (a) survey spectra, (b) Mg 1s, (c) O 1s, (d) Cl 2p

Fig.10 XPS of the surface film of 2002 Al-alloy under coupling condition after immersion 24 h in 0.5 mg/L NaCl solution at 30 ℃: (a) survey spectra, (b) Al 2p, (c) O 1s, (d) Cl 2p

Fig.11 Schematic diagram of the galvanic corrosion mechanism between AZ91D Mg-alloy and 2002 Al-alloy in 0.5 mg/L NaCl solution at 30 ℃ at initial stage (a), middle stage (b) and later stage (c)

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