Abstract
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.
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