The effect of ZnAl-LDHs-CO3 on the corrosion behaviour of Zn-5Al alloys in 3.5wt.% NaCl solution

[Display omitted] •The ZnAl-LDHs−CO3 is prepared on Zn-5Al alloy using the substrate as an internal source of the both metal ions.•The ZnAl-LDHs−CO3 nanosheets on the Zn/Al eutectoid area are denser than that on the Zn/Al eutectic area.•ZnAl-LDHs−CO3 nanosheets will prevent the generation of cracks...

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Bibliographic Details
Published in:Corrosion science 2021-02, Vol.179, p.109165, Article 109165
Main Authors: Huang, Qiuyu, Wang, Youbin, Zhou, Bingtao, Wei, Yuezhou, Gao, Feng, Fujita, Toyohisa
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Corrosion
Corrosion behaviour
Corrosion effects
Corrosion mechanisms
Corrosion prevention
Corrosion products
Electrochemical analysis
Eutectic alloys
Eutectoids
Submerging
Substrates
Zn-5Al
ZnAl-LDHs−CO3
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Summary:[Display omitted] •The ZnAl-LDHs−CO3 is prepared on Zn-5Al alloy using the substrate as an internal source of the both metal ions.•The ZnAl-LDHs−CO3 nanosheets on the Zn/Al eutectoid area are denser than that on the Zn/Al eutectic area.•ZnAl-LDHs−CO3 nanosheets will prevent the generation of cracks in the corrosion product film.•ZnAl-LDHs−CO3 can restrain the corrosion of Zn-5Al alloy substrate. In this work, the ZnAl-LDHs−CO3 film was prepared on Zn-5Al alloy by in-situ growth method. The ZnAl-LDHs−CO3 nanosheets on the Zn/Al eutectoid areas are denser than that on the Zn/Al eutectic areas of Zn-5Al alloy. During the immersion corrosion process, the corrosion products of LDHs/Zn-5Al deposit in the gaps of the ZnAl-LDHs−CO3 film, which will form a dense film on the Zn-5Al alloys. The electrochemical analysis shows that the ZnAl-LDHs−CO3 film can restrain the corrosion of Zn-5Al alloy substrate. At last, the corrosion protection mechanism of ZnAl-LDHs−CO3 film on Zn-5Al alloys are discussed in detail.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2020.109165