(中船重工七二五所青岛分部 海洋腐蚀与防护国防科技重点实验室，青岛266071)
摘 要: 以 Zn 和 Al粉末为原料(Zn质量分数为85%)，采用冷气动力喷涂方法制备65%Zn-Al 涂层。采用 SEM 和光学显微镜(OM)对涂层的显微组织进行研究，结合 XRD 和 X 射线能谱(EDS)对涂层的沉积特性进行分析。结果表明：在本实验条件下可获得厚度为0.7 mm、孔隙率为1.7%的65%Zn-Al复合涂层；Al 粒子的沉积效率要远高于Zn 粒子的；Zn 和 Al 粒子主要通过塑性变形机械咬合在一起，粒子间结合紧密；交界面处粒子由于连续冲击作用产生破碎细化；涂层显微硬度高于 Zn 和 Al 块材的，涂层的本身强度大于其与基体的结合强度，部分结合面涂层与基体存在元素扩散的现象，组织中未检测到固溶体与化合物相。
关键字: 65%Zn-Al 涂层; 沉积特性; 结合机理; 冷喷涂
cold gas dynamic spray
（State Key Laboratory for Marine Corrosion and Protection,
China Shipbuilding Industry 725 Research Institute, Qingdao 266071, China）
Abstract:With Zn and Al mixed powders as raw materials, 65%Zn-Al coatings were prepared by cold gas dynamic spray. The microstructures of the cold-sprayed 65%Zn-Al coatings were characterized by SEM and OM. XRD and EDS were used to analyze the co-deposited characteristics of 65%Zn-Al coatings. The results reveal that a densely co-deposited 65%Zn-Al coating with thickness of about 0.7 mm and porosity of 1.7% is obtained. The deposition efficiency of Al particles on the co-deposited coating is obviously higher than that of Zn particles. The bonding among Zn and Al particles mainly attributes to the plastic deformed mechanical embedding effect, and the combination among particles is tight. Those particles at the interface are broken and fined by continuous collision, so they have relative higher micro hardness than Zn or Al bulk metal. The bonding among the particles in the coating is more strength than the bonding of coating to substrate. There is element diffusion phenomenon in the interface between the coating and the substrate, and no solid solution and compound is observed.
Key words: 65%Zn-Al coating; deposition characteristic; bonding mechanism; cold spray
