6061-7075异种铝合金搅拌摩擦焊接件表面整体陶瓷防护膜的制备
Preparation of Overall Ceramic Coating on 6061-7075 Dissimilar Aluminum Alloy Friction Stir Welded Parts
摘 要
通过微弧氧化处理，使6061与7075铝合金的搅拌摩擦焊接件（连接件）被一层陶瓷膜整体包裹，通过扫描电镜（SEM）、能谱（EDS）、X射线衍射（XRD）和电化学工作站等分析了母材和焊缝区表面膜层的形貌和成分，并基于检测结果推导了整体陶瓷膜的生长机制。结果表明：整体微弧氧化后，连接件表面的膜层是致密的；6061和7075表面膜主要成分为α-Al2O3、γ-Al2O3和少量的Al2SiO5，而焊缝区则主要由α-Al2O3和γ-Al2O3组成；微弧氧化降低了连接件不同区域间的腐蚀电位差，显著提高了连接件整体的耐蚀性。
陶瓷膜
异种金属连接件
搅拌摩擦焊
焊接接头
overall micro-arc oxidation
ceramic coating
dissimilar metals connecting part
friction stir welding
welded joint
Abstract
Through micro-arc oxidation treatment, the friction stir welded parts (connectors) of 6061 and 7075 aluminum alloys were integrally wrapped by a layer of ceramic film. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and electrochemical workstation were used to analyze the morphology and composition of the surface film on the base metal and weld zone, and based on the detection results, the growth mechanism of the monolithic ceramic film was deduced. The results showed that the film layer on the surface of the connector was dense after the overall micro-arc oxidation. The main components of the film on the surface 6061 and 7075 were α-Al2O3, γ-Al2O3 and a small amount of Al2SiO5, while the weld zone was mainly composed of α-Al2O3 and γ-Al2O3. Micro-arc oxidation reduced the corrosion potential difference between different regions of the connector and significantly improved the overall corrosion resistance of the connector.
中图分类号 TG178 DOI 10.11973/fsyfh-202207015
所属栏目 试验研究
基金项目 国家自然科学基金（51861024）
收稿日期 2021/2/26
修改稿日期
网络出版日期
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引用该论文: WU Linfen,ZHU Zhengqiang,CHEN Yanfei,SONG Xiaocun,ZHOU Jixue. Preparation of Overall Ceramic Coating on 6061-7075 Dissimilar Aluminum Alloy Friction Stir Welded Parts[J]. Corrosion & Protection, 2022, 43(7): 92
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【2】PRABHU T R. An overview of high-performance aircraft structural Al alloy-AA7085[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(7):909-921.
【3】RAO H M, GHAFFARI B, YUAN W, et al. Effect of process parameters on microstructure and mechanical behaviors of friction stir linear welded aluminum to magnesium[J]. Materials Science and Engineering:A, 2016, 651:27-36.
【4】GUO W, YOU G Q, YUAN G Y, et al. Microstructure and mechanical properties of dissimilar inertia friction welding of 7A04 aluminum alloy to AZ31 magnesium alloy[J]. Journal of Alloys and Compounds, 2017, 695:3267-3277.
【5】LAKSHMINARAYANAN A K, ANNAMALAI V E. Fabrication and performance evaluation of dissimilar magnesium-aluminium alloy multi-seam friction stir clad joints[J]. Transactions of Nonferrous Metals Society of China, 2017, 27(1):25-35.
【6】WANG S N, GU Y H, GENG Y L, et al. Investigating local corrosion behavior and mechanism of MAO coated 7075 aluminum alloy[J]. Journal of Alloys and Compounds, 2020, 826:153976.
【7】XIAO K, DONG C F, WEI D, et al. Galvanic corrosion of magnesium alloy and aluminum alloy by kelvin probe[J]. Journal of Wuhan University of Technology-Mater.Sci.Ed., 2016, 31(1):204-210.
【8】MIAO Y G, ZHANG B S, WU B T, et al. Joint characteristics and corrosion properties of bypass-current double-sided arc-welded aluminum 6061 alloy with Al-Si filler metal[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(4):360-366.
【9】CHEN Y F, ZHOU J X, LIU H T, et al. Overall micro-arc oxidation treatment for AZ31B-6061 magnesium-aluminium dissimilar metal connecting parts[J]. Corrosion Engineering, Science and Technology, 2017, 52(6):470-475.
【10】TRAN Q P, KUO Y C, SUN J K, et al. High quality oxide-layers on Al-alloy by micro-arc oxidation using hybrid voltages[J]. Surface and Coatings Technology, 2016, 303:61-67.
【11】Magnesium Technology 2016[M].[S.l.]:Springer, 2016.
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【13】鲁亮, 薛文斌, 金小越, 等. 5083铝合金搅拌摩擦焊接头微弧氧化表面防护[J]. 材料热处理学报, 2011, 32(11):140-144.
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【18】欧艳春, 陈明安. 6061铝合金搅拌摩擦焊焊缝微弧氧化涂层的耐蚀性[J]. 电镀与涂饰, 2015, 34(13):719-724, 1.
【19】RAO K P, JANAKI RAM G D, STUCKER B E. Improvement in corrosion resistance of friction stir welded aluminum alloys with micro arc oxidation coatings[J]. Scripta Materialia, 2008, 58(11):998-1001.
【20】JAYARAJ R K, MALARVIZHI S, BALASUBRAMANIAN V. Optimizing the micro-arc oxidation (MAO) parameters to attain coatings with minimum porosity and maximum hardness on the friction stir welded AA6061 aluminium alloy welds[J]. Defence Technology, 2017, 13(2):111-117.
【21】CHEN Y F, SONG X C, ZHOU J X, et al. The study on the overall plasma electrolytic oxidation for 6061-7075 dissimilar aluminum alloy welded parts based on the dielectric breakdown theory[J]. Materials (Basel, Switzerland), 2018, 11(1):63.
【22】YE Z Y, LIU D X, YUAN M, et al. Effects of prior corrosion with and without stress on the mechanical properties of 7475-T761 aluminum alloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(5):608-613.
【23】TANG H, YU D Z, LUO Y, et al. Preparation and characterization of HA microflowers coating on AZ31 magnesium alloy by micro-arc oxidation and a solution treatment[J]. Applied Surface Science, 2013, 264:816-822.
【24】ARRABAL R, MATYKINA E, SKELDON P, et al. Coating formation by plasma electrolytic oxidation on ZC71/SiC/12p-T6 magnesium metal matrix composite[J]. Applied Surface Science, 2009, 255(9):5071-5078.
【25】CAI J S, CAO F H, CHANG L R, et al. The preparation and corrosion behaviors of MAO coating on AZ91D with rare earth conversion precursor film[J]. Applied Surface Science, 2011, 257(8):3804-3811.
【26】DONG K H, SONG Y W, SHAN D Y, et al. Corrosion behavior of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy[J]. Corrosion Science, 2015, 100:275-283.
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