Cold spraying aluminum-based coatings are widely used for corrosion protection of metals such as steel and magnesium alloy. However, poor pitting resistance and short protection life are the shackles of aluminum-based coating. In order to solve this problem, this paper innovatively utilized the synergistic effect of reduced graphene oxide (rGO) and layered double hydroxide (LDH) to modify the coating efficiently. Al-GLG coatings were prepared by cold spraying rGO and LDH-modified aluminum powders. The structure, composition and corrosion resistance of the Al-GLG coating were analyzed and compared with that of unmodified Al-based coating and graphene-modified Al-based (Al-G) coating. As a result, the Al-GLG coating presents a continuous network GLG surrounding the deformed aluminum powder, and this special coating exhibits pitting resistance and long life. The corrosion current density of the Al-GLG coating is only 0.01287 μA·cm⁻², which is three orders of magnitude lower than that of the Al-based coating, and its pitting potential is about −0.24 V_SCE, which is over 540 mV higher than that of the Al-based coating. During the full immersion text, the Al-GLG coating keeps the largest Rc (7.21×10⁴ Ω·cm²) and low-frequency impedance modulus|Z|_0.01Hz (3.66×10⁴ Ω·cm²). The corrosion resistance mechanism of the Al-GLG coating was investigated via field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS), respectively. The excellent pitting corrosion resistance of the Al-GLG coating is attributed to the synergistic effect of the shielding effect of reduced graphene oxide and the ion exchange inhibition effect of LDH.

冷喷涂铝基涂料广泛用于钢和镁合金等金属的腐蚀防护。但耐点蚀性差、保护寿命短是铝基涂层的桎梏。为了解决这个问题，本文创新性地利用了还原氧化石墨烯（rGO）和层状双氢氧化物的协同效应。(LDH) 有效地改性涂层。通过冷喷涂 rGO 和 LDH 改性铝粉制备 Al-GLG 涂层。分析了Al-GLG涂层的结构、成分和耐腐蚀性，并与未改性的铝基涂层和石墨烯改性的铝基（Al-G）涂层进行了比较。因此，Al-GLG 涂层在变形的铝粉周围呈现出连续的网络 GLG，这种特殊涂层具有抗点蚀性和长寿命。Al-GLG涂层的腐蚀电流密度仅为0.01287 μA·cm ^-2，比Al基涂层低三个数量级，点蚀电位约为-0.24 V_SCE, 比铝基涂层高 540 mV 以上。在全浸文本过程中，Al-GLG涂层保持最大的Rc（7.21×10 ⁴  Ω·cm ²）和低频阻抗模量|Z| _0.01Hz（3.66×10 ⁴  Ω·cm ² ）。分别通过场发射扫描电子显微镜（FE-SEM）、X射线衍射（XRD）、拉曼光谱和X射线光电子能谱（XPS）研究了Al-GLG涂层的耐蚀机理。Al-GLG涂层优异的耐点蚀性能归因于还原氧化石墨烯的屏蔽作用和LDH的离子交换抑制作用的协同作用。