Study on the microstructure and mechanical properties of cold sprayed Zn-Al alloy coatings
A high-pressure cold sprayed Zn-Al alloy coating was prepared using Q235 steel as the substrate,and the effect of substrate roughness on the microstructure,microhardness,and bonding strength of the cold sprayed Zn-Al alloy coating was studied.Research has shown that the cold sprayed Zn-Al alloy coating has a dense organizational structure,with a porosity of less than 0.5%,and no powder phase transformation or oxida-tion occurs during the spraying process.As the substrate roughness increases,the mechanical bite of the coating substrate interface is significantly improved.The effect of substrate roughness on the microhardness of coatings is mainly concentrated near the coating substrate interface.As the substrate roughness increases,the micro-hardness of coatings near this interface increases,while the microhardness of coatings far away from this inter-face is not significantly affected by substrate roughness.The substrate roughness has a significant impact on the bonding strength of the coating.When the substrate roughness increases from 1.6μm to 10.2μm,the bonding strength of the coating increases from 4.5 MPa to 46.4 MPa,and the tensile fracture failure mode changes from adhesive fracture to a composite failure mode of adhesive fracture and adhesive fracture.
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