(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 教育部有色金属材料科学与工程实验室，长沙 410083)
摘 要: 采用硬度测试、晶间腐蚀试验、金相及透射电镜观察研究人工时效对6005A铝合金晶间腐蚀性能的影响。结果表明：6005A铝合金在固溶水淬后进行人工时效，晶间腐蚀敏感性随时效时间的延长而变化；时效初期，合金的晶间腐蚀敏感性很低，随时效时间的延长，晶间腐蚀敏感性增加；时效12 h时，合金硬度达峰值，同时晶间腐蚀敏感性也达最大，随后晶间腐蚀敏感性减弱，出现点蚀。6005A铝合金晶间腐蚀敏感性与晶界有关，点蚀的引入与晶内Q′相的析出长大有关。
关键字: 6005A铝合金；人工时效；晶间腐蚀
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The effect of artificial ageing on the corrosion performance of 6005A Al alloy was investigated by hardness test, intergranular corrosion test, optical microscopy and TEM observation. The results show that the intergranular corrosion susceptibility of 6005A Al alloy is related to the artificial ageing time. The accelerated corrosion test reveals that the intergranular corrosion(IGC) of 6005A Al alloy is low susceptible to in the beginning of the artificial ageing after water quenched. However, IGC susceptibility increases with the increase of aging time, and reaches the peak value after artificial ageing for 12 h, while the hardness is the highest. The overageing reduces the IGC susceptibility, however, the slight pitting is produced. The increased IGC susceptibility is related to the grain boundary. The pitting susceptibility by over ageing is evolved due to coarsening of the Q′-phase particles.
Key words: 6005A Al alloy; artificial ageing; intergranular corrosion
