Self-healing PEO/MgAlLa LDHs-MXene composite coating loaded with 4-aminophenol for corrosion protection of Mg-Gd-Y-Zn LPSO Mg alloy

This paper provides an effective method to solve the problems that magnesium alloys easily corrode and their coatings are easily damaged. The micro-pores of PEO coating on the Mg alloy were sealed by in-situ growth of MgAlLa LDHs, and then compounded with MXene doped 4-aminophenol corrosion inhibitor to obtain PEO/ MgAlLa LDHs-MXene@4-Aminophenol (P/MgAlLa LDHs-M@A) composite coating. The structure, morphology and composition of the P/MgAlLa LDHs-M@A coating contained the successful combination of MgAlLa LDHs and MXene@4-Aminophenol. The P/MgAlLa LDHs-M@A coating had excellent corrosion resistance and self-healing properties, with an impedance modulus | Z | 0.01 of 8.8 x 10 7 Omega cm 2 . Scratch defects were self-healed within 12 h. In addition, the mechanisms of corrosion resistance and self-healing were explained.