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In-Situ Fabrication and Corrosion Resistance Study of Layered Double Hydroxide Coating on Mg-Zn Alloy

SSRN, ISSN: 1556-5068
2023
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Article Description

In this study, a Mg-Zn Layered Double Hydroxide (LDH) coating was in-situ fabricated on Mg-Zn alloy to improve its corrosion resistance properties. The LDH coating was prepared through a chemical method using carbonate solution and that ajusted by sodium hydroxide solution. The morphology, composition, and structure of the LDH coating were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR). The results demonstrated the successful formation of a uniform and compact layered double hydroxide (LDH) coating on the surface of Mg-Zn alloy. This coating was achieved by adjusting the pH of the carbonate solution to 10 using sodium hydroxide solution, with a reaction time of 4 hours. The corrosion resistance performance of the LDH-coated Mg-Zn alloy was evaluated using electrochemical impedance spectroscopy (EIS) and polarization curves in 3.5% (wt.) NaCl solution. The corrosion resistance tests revealed that the LDH-coated Mg-Zn alloy exhibited significantly improved corrosion resistance compared to the uncoated alloy. Such as the electrochemical potential (Ecorr) is 1.3362V, higher than that of ZK61M magnesium (-1.4645V). Meanwhile the corrosion current density is 3.30×10-6A/cm-2, about 0.94% of that of ZK61M magnesium alloy (3.51×10-4A/cm-2). The LDH coating effectively inhibited the corrosion process by acting as a protective barrier, preventing the penetration of corrosive species into the alloy substrate. This research provides valuable insights into the development of corrosion-resistant coatings for Mg-Zn alloys using in-situ fabrication techniques.

Bibliographic Details

Yang Yu; Fei Xiao; Kun Liu; Junge Chen; Le Mi; Aihu Feng; Yun Yu

Elsevier BV

Multidisciplinary; Mg-Zn alloy; layered double hydroxide (LDH); in-situ; Corrosion resistance; divalent metal

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