The MgAl Layered double hydroxides (LDHs)/graphene oxide (GO) composite film was fabricated in situon the micro-arc oxidation (MAO) film (MAO/LG) of AZ31 magnesium alloy in one step by hydrothermalchemical conversion method. The growth behavior and co...
The MgAl Layered double hydroxides (LDHs)/graphene oxide (GO) composite film was fabricated in situon the micro-arc oxidation (MAO) film (MAO/LG) of AZ31 magnesium alloy in one step by hydrothermalchemical conversion method. The growth behavior and corrosion properties of LG films were investigated.
The results show that the chemical structure, composition and morphology of the LG film willgradually change with the extension of the hydrothermal treatment time based on using the selfdissolvedcation (Mg2+ and Al3+) in the MAO film as the source of growing LDHs without introducingany external metal cations. The potentiodynamic polarization showed that the MAO/LG-12 h coating(1.28 109 A/cm2) after in situ growth for 12 h was more corrosion resistant than the MAO coating(8.49 106 A/cm2). The synergistic effect of GO and LDHs can significantly improve the corrosion protectionability of MAO coating. In addition, the transition process of the growth behavior of the LG filmlayer on the MAO coating is explained in detail.