In order to improve the cathodic protection and wear resistance of cold spraying Zn-based coatings, Zn–Ni/Cu–Al₂O₃ composite coating was prepared by co-depositing Zn powders, nickel-coated Cu powders, and Al₂O₃ powders on the steel substrate using the low-pressure cold spraying method. The structure and composition of Zn–Ni/Cu–Al₂O₃ coatings were analyzed by scanning electron microscopy, energy dispersive spectrum analysis, and X-ray diffraction, respectively. And their wear and corrosion resistance were tested. The results show that the structure of the Zn–Ni/Cu–Al₂O₃ composite coating is compact and the nickel powder is evenly distributed in the coating. Compared with the Zn–Al₂O₃ coating and Zn–Cu–Al₂O₃ coating, the Zn–Ni/Cu–Al₂O₃ composite coating has better wear resistance in air and stronger corrosion resistance in the 3.5 wt.% NaCl solutions. The Zn–Ni/Cu–Al₂O₃ coating has the lowest corrosion rate and maximum impedance after the immersion and scratch tests. Due to the promoting effect of Ni, the Zn–Ni/Cu–Al₂O₃ coating can quickly form a dense protective layer of corrosion products, which makes the Zn–Ni/Cu–Al₂O₃ composite coating has better cathodic protection and defect self-repair performance.

为提高冷喷涂锌基涂层的阴极保护和耐磨性，采用共沉积锌粉、镀镍铜粉和Al ₂ O _{3制备了Zn-Ni/Cu-Al 2} O ₃复合涂层。采用低压冷喷涂法在钢基体上喷粉。_{Zn-Ni/Cu-Al 2} O ₃涂层的结构和组成分别通过扫描电子显微镜、能量色散光谱分析和X射线衍射分析。并测试了它们的耐磨性和耐腐蚀性。结果表明，Zn-Ni/Cu-Al ₂ O _3的结构复合镀层致密，镀层中镍粉分布均匀。与Zn–Al ₂ O ₃涂层和Zn–Cu–Al ₂ O ₃涂层相比，Zn–Ni/Cu–Al ₂ O ₃复合涂层在空气中具有更好的耐磨性和更强的耐腐蚀性，在3.5 wt.%氯化钠溶液。Zn–Ni/Cu–Al ₂ O ₃涂层在浸泡和划痕测试后具有最低的腐蚀速率和最大的阻抗。由于Ni的促进作用，Zn-Ni/Cu-Al ₂ O ₃镀层能迅速形成致密的腐蚀产物保护层，使Zn-Ni/Cu-Al ₂ O₃复合镀层具有更好的阴极保护和缺陷自修复性能。