喷丸强化与固溶强化复合处理对2024铝合金耐蚀性能的影响  

Effects of shot peen strengthening and solution strengthening combined treatment on corrosion resistance of 2024 aluminum alloy

作　　者：乔景振 张笑闻 张环月[2] 付雪松[1] 周文龙[1] 陈国清[1] Qiao Jingzhen;Zhang Xiaowen;Zhang Huanyue;Fu Xuesong;Zhou Wenlong;Chen Guoqing(Liaoning Key Laboratory of Solidification Control and Digital Fabrication Technology,School of Materials Science and Engineering,Dalian University of Technology,Dalian Liaoning 116024,China;Instrumental Analysis Center,Dalian University of Technology,Dalian Liaoning 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院、辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116024 [2]大连理工大学分析测试中心,辽宁大连116024

出　　处：《金属热处理》2024年第6期69-76,共8页Heat Treatment of Metals

基　　金：国家重点研发计划政府间合作专项(2021YFE0115400);航空科学基金(201936025001)。

摘　　要：研究了喷丸强化、固溶强化、喷丸强化+固溶强化3种工艺对初始时效态2024铝合金耐盐雾腐蚀性能的影响。结果表明,原始试样组织内存在大量第二相颗粒,颗粒尺寸最长约为83μm。经固溶处理后,部分第二颗粒溶解于基体,剩余颗粒尺寸减小至17μm。采用喷丸强化和固溶强化复合处理后,材料近表面组织的第二相颗粒几乎全部溶解。当盐雾腐蚀时间为3 h时,原始试样的腐蚀坑直径约为?90μm,喷丸+固溶强化试样的腐蚀坑直径约为?50μm;喷丸试样的腐蚀深度约为38.75μm,而喷丸+固溶强化试样的腐蚀深度降低至12.5μm。这表明喷丸强化和固溶强化复合处理有助于第二相颗粒的溶解,改善材料组织和成分的均匀性,进而提升铝合金的耐蚀性能。Effects of shot peening strengthening,solution strengthening and shot peening strengthening+solution strengthening on the salt spray corrosion resistance of as⁃aged 2024 aluminum alloy were studied.The results show that there are numerous secondary phase particles in the primitive specimen microstructure,with the longest particle size of about 83μm.After solution treatment,some of the secondary phase particles dissolve in the matrix,and the remained particle size is reduced to 17μm.After the combined treatment of shot peening and solution treatment strengthening,almost all of the secondary phase particles near the surface are dissolved.When the salt spray corrosion test time is 3 h,the diameter of the corrosion pit of the primitive specimen is approximatelyϕ90μm,the corrosion pit diameter of the shot peening and solution strengthened specimen is aboutϕ50μm,the corrosion depth of the shot peening specimen is about 38.75μm,while the corrosion depth of the shot peening and solution strengthened specimen decreases to 12.5μm.This indicates that the combined treatment of shot peening and solution treatment strengthening contributes to dissolve the second phase particles,improves the uniformity of material structure and composition,and thereby enhances the corrosion resistance of aluminum alloys.

关 键 词：盐雾腐蚀 第二相颗粒 固溶处理 晶间腐蚀 点蚀坑 

分 类 号：TG156.9[金属学及工艺—热处理]