| 引用本文: | 胡启达,张华,胡柏尭,徐磊欣,邓呈敏.2195铝锂合金搅拌摩擦焊接头盐雾腐蚀行为研究[J].材料科学与工艺,2021,29(4):33-38.DOI:10.11951/j.issn.1005-0299.20200267. |
| HU Qida,ZHANG Hua,HU Boyao,XU Leixin,DENG Chengmin.Study on salt spray corrosion behavior of friction stir welding 2195 Al-Li alloy friction[J].Materials Science and Technology,2021,29(4):33-38.DOI:10.11951/j.issn.1005-0299.20200267. |
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| 摘要: |
| 本文研究了厚度为8 mm的2195铝锂合金母材及搅拌摩擦焊接头在3.5wt.%NaCl介质中的盐雾腐蚀行为,计算了不同腐蚀周期下的腐蚀速率,并通过OM、SEM、TEM观察分析母材与焊核区的腐蚀微观形貌。结果表明:2195铝锂合金母材及搅拌摩擦焊接头在3.5%NaCl腐蚀介质中的主要腐蚀形式为点蚀,随时间的延长发展为晶间腐蚀并剥落。2195铝锂合金搅拌摩擦焊接头耐蚀性优于母材,是因为大量高电化学活性的T1相的存在降低了母材区的耐蚀性能,在焊核区T1相完全溶解,焊核区的耐腐蚀性能强于母材区。在腐蚀初期腐蚀速率最大,随腐蚀时间的延长腐蚀速率逐渐降低,并最终趋于平稳。这是由于腐蚀产物在2195铝锂合金基体表面不断积累,对基体产生了一定保护。 |
| 关键词: 2195铝锂合金 搅拌摩擦焊 盐雾腐蚀 腐蚀行为 腐蚀速率 |
| DOI：10.11951/j.issn.1005-0299.20200267 |
| 分类号:TG42 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(51774047)；北京市长城学者培养计划项目(CIT&TCD20170309). |
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| Study on salt spray corrosion behavior of friction stir welding 2195 Al-Li alloy friction |
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HU Qida,ZHANG Hua,HU Boyao,XU Leixin,DENG Chengmin
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(School of Mechanical Engineering, Beijing Institute of Petroleum and Chemical Engineering, Beijing 102600, China)
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| Abstract: |
| The salt spray corrosion behavior of 8 mm thick 2195 aluminum lithium alloy base material and stir friction welding head in 3.5wt.%NaCl medium was investigated.The corrosion rates under different corrosion cycles were studied.The corrosion microscopic morphology of the base material and welding core area were observed and analyzed through OM,SEM,and TEM.Results show that the main form of corrosion of 2195 aluminum lithium alloy base material and stir friction welded head in 3.5%NaCl corrosive medium was pitting.With the extension of time,intergranular corrosion and spalling was developed.The corrosion resistance of 2195 aluminum lithium alloy stir friction welded head was better than that of the base material, because the presence of a large number of highly electrochemically active T1 phase reduced the corrosion resistance of the base material area, while in the weld core area T1 phase completely dissolved, making the weld core area of corrosion resistance stronger.Corrosion rate in the base materials at the beginning of corrosion was the fastest, which gradually decreased with corrosion time, and eventually stabilized,This is because the corrosion products accumulated on the 2195 aluminum lithium alloy substrate surface, which protected the substrate to a certain extent. |
| Key words: 2195 Al Li alloy friction stir welding salt spray corrosion corrosion behavior corrosion rate |
