Modification of Nano-α-Al₂O₃ and Its Influence on the Surface Properties of Waterborne Polyurethane Resin Composite Passivation Films  

作　　者：Jiankang Fu Changshuai Ma Yameng Zhu Jing Yuan Qianfeng Zhang Jiankang Fu;Changshuai Ma;Yameng Zhu;Jing Yuan;Qianfeng Zhang(Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, Ma’,anshan, China;Department of Civil Engineering, Tongling University, Tongling, China;Department of Civil Engineering, Manitoba University, Winnipeg, MB, Canada)

机构地区：[1]Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, Ma’,anshan, China [2]Department of Civil Engineering, Tongling University, Tongling, China [3]Department of Civil Engineering, Manitoba University, Winnipeg, MB, Canada

出　　处：《Journal of Materials Science and Chemical Engineering》2024年第5期29-48,共20页材料科学与化学工程（英文）

摘　　要：Silane coupling agent KH560 was used to modify the surface of nano-α-Al₂O₃ in ethanol-aqueous solution with different proportions. The particle size of nano-α-Al₂O₃ was determined by nano-particle size analyzer, and the effects of nano-α-Al₂O₃ content, ethanol-aqueous solution ratio and KH560 dosage on the dispersion and particle size of nano-α-Al₂O₃ were investigated. The material structure before and after modification was determined by Fourier transform infrared spectroscopy (FTIR). Aqueous polyurethane resin and inorganic components are combined with modified nano-α-Al₂O₃ dispersion to form chromium-free passivation solution. The solution is coated on the galvanized sheet, the adhesion and surface hardness are tested, the bonding strength of the coating and the surface hardness of the substrate are discussed. The corrosion resistance and surface morphology of the matrix were investigated by electrochemical test, neutral salt spray test and scanning electron microscope test. The chromium-free passivation film formed after the modification of nano-α-Al₂O₃ increases the surface hardness of galvanized sheet by about 85%. The corrosion resistance of the film is better than that of a single polyurethane film. The results show that the surface hardness and corrosion resistance of polyurethane resin composite passivation film are significantly improved by the introduction of nano-α-Al₂O₃.Silane coupling agent KH560 was used to modify the surface of nano-α-Al₂O₃ in ethanol-aqueous solution with different proportions. The particle size of nano-α-Al₂O₃ was determined by nano-particle size analyzer, and the effects of nano-α-Al₂O₃ content, ethanol-aqueous solution ratio and KH560 dosage on the dispersion and particle size of nano-α-Al₂O₃ were investigated. The material structure before and after modification was determined by Fourier transform infrared spectroscopy (FTIR). Aqueous polyurethane resin and inorganic components are combined with modified nano-α-Al₂O₃ dispersion to form chromium-free passivation solution. The solution is coated on the galvanized sheet, the adhesion and surface hardness are tested, the bonding strength of the coating and the surface hardness of the substrate are discussed. The corrosion resistance and surface morphology of the matrix were investigated by electrochemical test, neutral salt spray test and scanning electron microscope test. The chromium-free passivation film formed after the modification of nano-α-Al₂O₃ increases the surface hardness of galvanized sheet by about 85%. The corrosion resistance of the film is better than that of a single polyurethane film. The results show that the surface hardness and corrosion resistance of polyurethane resin composite passivation film are significantly improved by the introduction of nano-α-Al₂O₃.

关 键 词：Micro-Nano α-Al₂O₃ Waterborne Polyurethane Resin Particle Size Surface Hardness Corrosion Resistance 

分 类 号：TG1[金属学及工艺—金属学]