(中船重工七二五所青島分部 海洋腐蝕與防護國防科技重點實驗室，青島266071)
摘 要: 以 Zn 和 Al粉末為原料(Zn質量分數(shù)為85%)，采用冷氣動力噴涂方法制備65%Zn-Al 涂層。采用 SEM 和光學顯微鏡(OM)對涂層的顯微組織進行研究，結合 XRD 和 X 射線能譜(EDS)對涂層的沉積特性進行分析。結果表明：在本實驗條件下可獲得厚度為0.7 mm、孔隙率為1.7%的65%Zn-Al復合涂層；Al 粒子的沉積效率要遠高于Zn 粒子的；Zn 和 Al 粒子主要通過塑性變形機械咬合在一起，粒子間結合緊密；交界面處粒子由于連續(xù)沖擊作用產生破碎細化；涂層顯微硬度高于 Zn 和 Al 塊材的，涂層的本身強度大于其與基體的結合強度，部分結合面涂層與基體存在元素擴散的現(xiàn)象，組織中未檢測到固溶體與化合物相。
關鍵字: 65%Zn-Al 涂層; 沉積特性; 結合機理; 冷噴涂
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
