(1. 中国科学院 金属研究所 中国科学院核用材料与安全评价重点实验室，沈阳 110016；
2. 南方海洋科学与工程广东省实验室（珠海），珠海 519000；
3. 中国科学技术大学 材料科学与工程学院，合肥 230026)
摘 要: 采用电化学方法研究了钛合金ZTi60和铝合金2024连接后的电偶腐蚀行为，以及控制电偶腐蚀的措施。采用零电阻电流计(ZRA)测量电偶电流，极化曲线测量偶接金属的极化行为，扫描电镜(SEM)观察样品的腐蚀形貌。结果表明：阳极金属2024初期电偶腐蚀轻微，之后腐蚀率逐渐增加并趋于稳定，这与铝合金表面致密钝化膜逐渐转变为疏松产物膜有关。与未偶接的2024相比，电偶腐蚀使铝合金表面点蚀坑变得更深，但数量更少。对阳极2024进行防护比对阴极ZTi60进行防护抑制电偶腐蚀的效果更好。然而，一旦阳极金属表面的防护涂层受损后，受损面积越小，电偶腐蚀的加速作用越明显。
关键字: 钛-铝连接；电偶腐蚀；表面防护；控制措施；钝化金属；涂层受损
（1. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China;
3. School of Materials and Engineering, University of Science and Technology of China, Hefei 230026, China）
Abstract:The galvanic corrosion of ZTi60-Al2024 coupling and its control measures were investigated by electrochemical methods. The galvanic current was measured by zero resistance ammeter(ZRA), the polarization behavior of the coupled metals was detected by polarization curves, and the corrosion morphology was observed by scanning electron microscopy(SEM). The results indicate that the galvanic corrosion of Al2024 anode is slight in the initial stage, and then the corrosion rate increases gradually, finally tends to a stable value, which is related to the transition of dense passive film to loose product film on Al2024 surface. Compared with the uncoupled Al2024, the corrosion pits on the coupled Al2024 are less but deeper. The protection of Al2024 anode can inhibit the galvanic corrosion better than the protection of ZTi60 cathode. However, once the protective coating on the anodic metal is damaged, the smaller the damaged area is, the severer the galvanic corrosion is.
Key words: Ti-Al coupling; galvanic corrosion; surface treatment; control measures; Passive metals; damaged coating
