A hydrophobic surface was successfully fabricated on the Mg-Al-layered double hydroxide (Mg-Al 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.

通过原位在Mg-Al层状双氢氧化物（Mg-Al LDH）/ Mg（OH）₂涂层的AZ31镁合金上成功制备了疏水表面蒸汽涂覆（SC）工艺以及随后的环保型肉豆蔻酸（MA）表面改性。通过XRD，SEM，EDS，FTIR和接触角（CA）测量研究了SC / MA复合涂层的微观结构，组成和疏水性。通过电位动力学极化，EIS和在3.5 wt％的NaCl溶液中析氢试验评估了杂化涂层的腐蚀行为。结果表明，LDH涂层具有纳米片状微观结构，经MA改性后仍保持不变。MA改性涂层表面的CA达到129°±3.5°，与基体相比，SC / MA-2涂层的腐蚀电流密度降低了大约三个数量级。事实证明，改性后的表面对AZ31合金具有有效的防腐作用。