| WANG Qiang,WANG Yong-gang,NIU Wen-juan,Ming-xing ZHANG,LIU Xin.Study on the Structure and Properties of Cold Sprayed Al-Zn Composite Coatings on Q345R Plate[J],50(2):287-293 |
| Study on the Structure and Properties of Cold Sprayed Al-Zn Composite Coatings on Q345R Plate |
| Received:August 10, 2020 Revised:January 14, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.02.030 |
| KeyWord:cold spraying Al-Zn composite coatings microstructure bond strength interface bonding mechanism |
| Author | Institution |
| WANG Qiang |
School of Metallurgical Engineering,Xi’an , China ;Shaanxi Research Center of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an , China |
| WANG Yong-gang |
School of Metallurgical Engineering,Xi’an , China |
| NIU Wen-juan |
School of Metallurgical Engineering,Xi’an , China |
| Ming-xing ZHANG |
Materials Engineering, School of Mechanical and Mining Engineering, The University of Queensland, Brisbane QLD 4072, Australia |
| LIU Xin |
Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation, China Special Equipment Inspection and Research Institute CSEI, Beijing , China |
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| Abstract: |
| The effects of Zn content on the microstructure, porosity, hardness and interfacial bonding strength between coating and substrate were studied. Pure Al and Al-Zn composite coatings with excellent properties were prepared on Q345R plate by cold spraying technology, the morphology of the coating was analyzed by scanning electron microscope, the mechanical properties of the coating were characterized by Vickers microhardness tester, and the interface bonding mechanism between the coating and the substrate was revealed.The results show that the bonding between pure Al and Al-Zn composite coatings with Q345R steel substrate is well, without obvious holes and cracks at the interface. With the increase of Zn content, the density and hardness of the composite coating increase gradually, and the interfacial bonding strength of pure Al and Al-20wt.%Zn composite coating is similar, and the failure fracture mode is typical interfacial adhesive fracture. With the increase of the Zn content, the interfacial bonding strength between the coating and the substrate increases gradually, the bonding strength of Al-40wt.% Zn composite coating is 35 MPa, and the fracture mode changes from adhesive fracture to the mixed failure mode of dominant interfacial adhesive fracture and auxiliary cohesive fracture of the coating. In conclusion, cold spraying, characterized by low temperature solid state deposition, can effectively avoid the adverse effects such as oxidation, phase transition, and thermal cracking caused by high temperature. In the deposition process, with the increase of the Zn content, the tamping effect on the coating is constantly strengthened, which improves the compactness and the mechanical properties of the coating. |
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