论文部分内容阅读
采用金相显微镜、电化学交流阻抗和扫描电镜研究表面机械处理(喷砂和打磨)对5×××铝合金/涂层体系的结合强度及晶间腐蚀性能的影响。结果表明:试样经表面机械处理后,基体表面的清洁度提高,粗糙度增大,涂层与基体的结合强度显著提高;其中表面喷砂后,基体与涂层结合强度提高198.7%;表面打磨后,基体与涂层结合强度提高167.4%;表面机械处理后,基体的耐晶间腐蚀能力明显降低,但合金/涂层体系的耐晶间腐蚀能力显著提高;表面喷砂后,合金/涂层体系与基体的耐蚀性都强于表面打磨后的耐蚀性。
The effects of surface mechanical treatment (sandblasting and grinding) on the bonding strength and intergranular corrosion resistance of 5 ××× aluminum alloy / coating system were investigated by metallographic microscope, electrochemical impedance spectroscopy and scanning electron microscopy. The results show that the surface cleanliness of the substrate increases and the roughness increases and the bonding strength between the substrate and the substrate increases significantly after surface mechanical treatment. The bonding strength between the substrate and the coating increases by 198.7% After grinding, the bonding strength between substrate and coating increased by 167.4%. After mechanical treatment, the intergranular corrosion resistance of the substrate decreased obviously, but the intergranular corrosion resistance of the alloy / coating system increased significantly. After the surface was sandblasted, the alloy / Corrosion resistance of the coating system and the substrate are better than the corrosion resistance after surface grinding.