To improve the corrosion protection of a nickel-based coating to the underlying magnesium alloy, a superhydrophobic nickel‑phosphorus/nickel/fluorinated polysiloxane (PFDTMS) triple-layer composite coating was successfully designed and fabricated on AZ31 magnesium alloy. The composite coating consists of an electroless-deposited nickel‑phosphorus (ELNi) bottom layer, an electrochemically deposited nickel (ECNi) nano-cone array middle layer, and a PFDTMS top layer via a dehydration-condensation reaction of silane. The surface morphology, structure, and chemical composition of the coating are identified by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The static water contact angle (WCA) of the composite coating is 153.0^° ± 4.6^°, attributed to the synergistic effect between nano-cone-shaped nickel and PFDTMS layer. Compared to the untreated magnesium alloy, the corrosion current density of the coating decreases by four orders of magnitude based on the Tafel curve, and the corresponding impedance modulus at low frequency (|Z|_{ƒ=0.01 Hz}) increases by almost four orders of magnitude based on the electrochemical impedance spectra (EIS), demonstrating the superior corrosion protection to magnesium alloy. Lastly, the wetting states of the water droplets on the nickel‑phosphorus layer with and without electrodeposition of nickel nano-cone array and silane modification are also discussed in detail.

为了提高镍基涂层对底层镁合金的腐蚀防护能力，在AZ31镁合金上成功设计并制备了超疏水镍-磷/镍/氟化聚硅氧烷（PFDTMS）三层复合涂层。该复合涂层由化学沉积镍磷 (ELNi) 底层、电化学沉积镍 (ECNi) 纳米锥阵列中间层和通过硅烷脱水缩合反应形成的 PFDTMS 顶层组成。通过扫描电子显微镜 (SEM)、傅里叶变换红外 (FT-IR) 光谱和 X 射线光电子能谱 (XPS) 确定涂层的表面形态、结构和化学成分。复合涂层的静水接触角（WCA）为153.0 ^°  ±4.6^°，归因于纳米锥形镍和PFDTMS层之间的协同作用。与未经处理的镁合金相比，涂层的腐蚀电流密度根据塔菲尔曲线降低了四个数量级，相应的低频阻抗模量（| Z | _{ƒ=0.01 Hz}）增加了近四个数量级基于电化学阻抗谱（EIS），证明了镁合金具有优越的腐蚀保护。最后，还详细讨论了电沉积镍纳米锥阵列和不采用硅烷改性的镍磷层上水滴的润湿状态。