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A hydrophobic surface was successfully fabricated on the Mg-Al-layered double hydroxide (Mg-AI LDH)/Mg(OH)2-coated AZ31 magnesium alloy via an in-situ steam coating (SC) process and a subsequent surface modification with environment-friendly myristic acid (MA).The microstructure,composition and hydrophobicity of SC/MA composite coating were investigated by XRD,SEM,EDS,FTIR,and contact angle (CA) measurement.The corrosion behavior of the hybrid coating was evaluated by potentiodynamic polarization,EIS and hydrogen evolution test in 3.5 wt.% NaCl solution.The results showed that the LDH coating had nano-flake microstructure,which remained unchanged after modification with MA.The CA of the MA-modified coating surface reached up to 129°± 3.5°,and the corrosion current density of SC/MA-2 coating decreased about three orders of the magnitude compared to that of the substrate.It is proven that the modified surface has an effective anti-corrosion effect on AZ31 alloy.The formation mechanism and the corrosion mechanism of the coating were also discussed.