晶间腐蚀性能的影响
(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 海军装备技术研究所，北京102442)
摘 要: 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。
关键字: 5×××铝合金；结合强度；表面机械处理；晶间腐蚀
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Naval Institute of Technology and Equipment, Beijing 102442, China）
Abstract:Metallographic microscope, electrochemical impedance spectroscope and scan electron microscope were used to study the effects of surface mechanical treatment (shot blasting and polishing) on the coherent strength and intergranular corrosion (IGC) of the coated 5××× aluminium alloy. The results show that the surface mechanical treatments (shot blasting and polishing) can markedly improve the adhesive strength by increasing the cleanliness and roughness of the substrate. The adhesive strengths after shot blasting and polishing are elevated by 198.7% and 167.4%, respectively. The IGC resistance of the substrate after surface mechanical treatment obviously decreases, while the IGC resistance of the coated alloy significantly increases. Moreover, the corrosive resistances of the coated alloy and the substrate after shot blasting are both better than those after polishing.
Key words: 5××× aluminum alloy; adhesive strength; surface mechanical treatment; intergranular corrosion
