Effect of V₂O₇⁴⁻ anion intercalation on the microstructure and corrosion resistance of MgAl Layered Double Hydroxides films on LA43M Mg-Li alloy

ABSTRACT

To improve the corrosion resistance of LA43M alloy, MgAl-NO₃⁻-Layered Double Hydroxides (LDH) was prepared on the surface of the alloy by an in situ hydrothermal method, and uniform and dense MgAl-V₂O₇⁴⁻-LDH films were successfully obtained by ion-exchange over different times. SEM, XRD, EDS, electrochemical polarisation, EIS and hydrogen evolution experiments were conducted to analyse microstructure and corrosion resistance of these films. The results verified that with increase of the ion-exchange reaction time, the nanosheets of the MgAl-V₂O₇⁴⁻-LDH film are larger in size, uniformly distributed, and slightly increased in thickness. The surface of the modified MgAl-V₂O₇⁴⁻-LDH film grown for 4 h on the surface had a staggered and tilted manner, and the gaps between the nanosheets were small, making it more effective in blocking the corrosive medium. The MgAl-NO₃⁻-LDH film modified by V₂O₇⁴⁻ anion intercalation can further improve the corrosion resistance of the LA43M alloy.

KEYWORDS:

• V₂O₇⁴⁻ anion intercalation
• Mg-Lialloy
• microstructure
• corrosion resistance
• layered double hydroxides

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

All data included in this study are available from the corresponding author upon request.

Additional information

Funding

Thanks are given to the Natural Science Basic Research Program of Shaanxi Province [Program No. 2023-JC-YB-479] and College Students’ Innovation and Entrepreneurship Training Program of Shaanxi Province [grant number S202210704072].