盐雾环境中2A12铝合金与钛合金搭接件的缝隙腐蚀行为
Crevice Corrosion Behavior of 2A12 Aluminum Alloy and Ti Alloy Lap Joint in Salt Spray Environment
摘 要
通过腐蚀形貌观察、腐蚀产物分析、极化曲线和电化学阻抗谱测试，研究了2A12铝合金与钛合金搭接件在中性盐雾环境中的缝隙腐蚀行为。结果表明：与2A12铝合金搭接件暴露区相比，缝隙区的腐蚀更严重，缝隙区与暴露区之间出现明显的分界线；对于2A12铝合金搭接件暴露区，腐蚀前期未出现明显的腐蚀现象，腐蚀12 h后发生点蚀；对于2A12铝合金搭接件缝隙区，随着腐蚀时间的延长，其表面由亚稳态点蚀逐渐发展为稳态点蚀，腐蚀加剧，形成点蚀坑群。
钛合金
盐雾环境
缝隙腐蚀
2A12 aluminum alloy
titanium alloy
salt spray environment
crevice corrosion
Abstract
The crevice corrosion behavior of 2A12 aluminum alloy lap joint in neutral salt spray was studied by means of corrosion morphology observation, corrosion product analysis, polarization curve and electrochemical impedance spectroscopy testing. The results showed that compared with exposed zone of 2A12 aluminum alloy and Ti alloy lap joint, the corrosion in crevice zone was more serious, and there was an obvious dividing line between crevice zone and exposed zone; For exposed zone of 2A12 aluminum alloy lap joint, there was no obvious corrosion phenomenon in the early stage of corrosion, and pitting corrosion occurred after 12 hours of corrosion; For crevice zone of 2A12 aluminum alloy lap joint, with the extension of corrosion time, the metastable pitting corrosion gradually developed into steady pitting corrosion, corrosion intensified and pitting pits were formed.
中图分类号 TG174 DOI 10.11973/fsyfh-202109001
所属栏目 试验研究
基金项目 航空科学基金（20185425009）；中央高校基本科研业务费专项资金（DUT19LAB16）
收稿日期 2020/1/9
修改稿日期
网络出版日期
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引用该论文: LIN Qihao,ZOU Shiwen,ZHANG Zhenhua,QU Yichao,WANG Xiao,YUAN Guoqing,DAI Junyi,FU Xuesong. Crevice Corrosion Behavior of 2A12 Aluminum Alloy and Ti Alloy Lap Joint in Salt Spray Environment[J]. Corrosion & Protection, 2021, 42(9): 1
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参考文献
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【4】蔡剑,刘道新,叶作彦,等. 腐蚀与交变载荷循环作用对2A12-T4铝合金疲劳寿命的影响[J]. 中国腐蚀与防护学报,2015,35(1):61-68.
【5】卢海斌,邓怀波,钟文彬,等. 钛铝异质材料插销增强搅拌摩擦点焊接头组织与力学性能[J]. 精密成形工程,2019,11(5):86-90.
【6】杜娟,张艺莹,陈翘楚,等. 航空用铝合金在酸性盐雾环境中腐蚀电化学[J]. 航空材料学报,2017,37(4):33-38.
【7】TAO L,SONG S Z,ZHANG X Y,et al. Image analysis of atmospheric corrosion of field exposure high strength aluminium alloys[J]. Applied Surface Science,2008,254(21):6870-6874.
【8】DAN Z H,TAKIGAWA S,MUTO I,et al. Applicability of constant dew point corrosion tests for evaluating atmospheric corrosion of aluminium alloys[J]. Corrosion Science,2011,53(5):2006-2014.
【9】SHI Y Y,ZHANG Z,SU J X,et al. Electrochemical noise study on 2024-T3 Aluminum alloy corrosion in simulated acid rain under cyclic wet-dry condition[J]. Electrochimica Acta,2006,51(23):4977-4986.
【10】DHANAPAL A,BOOPATHY S R,BALASUBRAMANIAN V. Developing an empirical relationship to predict the corrosion rate of friction stir welded AZ61A magnesium alloy under salt fog environment[J]. Materials & Design,2011,32(10):5066-5072.
【11】PANDA B,BALASUBRAMANIAM R,DWIVEDI G. On the corrosion behaviour of novel high carbon rail steels in simulated cyclic wet-dry salt fog conditions[J]. Corrosion Science,2008,50(6):1684-1692.
【12】上官晓峰,杜志杰. 7475铝合金与TC18钛合金接触腐蚀研究[J]. 西安工业大学学报,2010,30(5):470-473.
【13】苏艳,朱玉琴,康凤. Ti8LC钛合金与主要结构材料的电偶腐蚀及防护研究[J]. 表面技术,2010,39(5):39-41,50.
【14】UMEDA J,NAKANISHI N,KONDOH K,et al. Surface potential analysis on initial galvanic corrosion of Ti/Mg-Al dissimilar material[J]. Materials Chemistry and Physics,2016,179:5-9.
【15】ZOU S W,QU Y C,ZHOU W L,et al. Anode characteristics of Al/Ti galvanic couple in a salt spray environment[J]. Materials and Corrosion,2019,70(12):2311-2319.
【16】张卫文,许峰,费劲,等. 梯度复合铝合金的缝隙腐蚀研究[J]. 材料保护,2006,39(5):1-4.
【17】BLANC C,LAVELLE B,MANKOWSKI G. The role of precipitates enriched with copper on the susceptibility to pitting corrosion of the 2024 aluminium alloy[J]. Corrosion Science,1997,39(3):495-510.
【18】VOEVODIN N,JEFFCOATE C,SIMON L,et al. Characterization of pitting corrosion in bare and Sol-gel coated aluminum 2024-T3 alloy[J]. Surface and Coatings Technology,2001,140(1):29-34.
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