微弧氧化膜对7A52铝合金搅拌摩擦焊接头腐蚀不均匀性的影响
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摘要
7A52铝合金搅拌摩擦焊接头焊核区由于发生动态再结晶,晶粒比较细小,组织呈现"洋葱环"分布,热力影响区的组织沿塑性流动方向分布,热影响区晶粒尺寸发生了明显的长大.接头组织不均匀导致不同区域的腐蚀行为不同.结果表明,没有微弧氧化膜时,母材的致钝电流远小于焊核区及热(力)影响区,更容易钝化;当微弧氧化膜的厚度为50μm,母材的致钝电流小于焊核区及热(力)影响区,较薄的微弧氧化膜对接头腐蚀不均匀性的改善作用不明显;当微弧氧化膜的厚度为70μm时,接头不同区域钝化特征接近,微弧氧化膜有助于减小接头组织不均匀对接头不同区域的腐蚀不均匀的影响.
Due to dynamic recrystallization of the7 A52 aluminum alloy friction stir welding joint weld zone.The grain size is relatively small, the organization presents"onion ring " distribution. the thermo mechanically affected zone is distributed along the plastic flow direction, and the grain size of the heat affected zone is obviously grown. The unevenness of the joint structure leads to different corrosion behaviors in different regions. The results show that when there is no micro-arc oxide film, the blunt current of the base material is much smaller than that of the weld nugget area and the heat(thermo mechanically) influence zone, and it is easier to passivate; when the thickness of the micro-arc oxide film is50 μm, the base material is blunt The current is less than the weld nugget zone and the heat(thermo mechanically) influence zone. The thinner micro-arc oxide film has no obvious effect on the improvement of joint corrosion inhomogeneity; when the thickness of the micro-arc oxide film is 70 μm, the passivation characteristics of different regions of the joint are closing, the micro-arc oxide film helps to reduce the influence on the unevenness corrosion of joint structure in different areas of the joint.
Due to dynamic recrystallization of the7 A52 aluminum alloy friction stir welding joint weld zone.The grain size is relatively small, the organization presents"onion ring " distribution. the thermo mechanically affected zone is distributed along the plastic flow direction, and the grain size of the heat affected zone is obviously grown. The unevenness of the joint structure leads to different corrosion behaviors in different regions. The results show that when there is no micro-arc oxide film, the blunt current of the base material is much smaller than that of the weld nugget area and the heat(thermo mechanically) influence zone, and it is easier to passivate; when the thickness of the micro-arc oxide film is50 μm, the base material is blunt The current is less than the weld nugget zone and the heat(thermo mechanically) influence zone. The thinner micro-arc oxide film has no obvious effect on the improvement of joint corrosion inhomogeneity; when the thickness of the micro-arc oxide film is 70 μm, the passivation characteristics of different regions of the joint are closing, the micro-arc oxide film helps to reduce the influence on the unevenness corrosion of joint structure in different areas of the joint.
引文
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[14]李忠盛,吴护林,潘复生,等.氧化时间对7A55铝合金微弧氧化膜的影响[J].航空材料学报,2009,29(3):23-25.Li Zhongsheng,Wu Hulin,Pan Fusheng,et al.Effect of oxidation time on micro-arc oxidation film of 7A55 aluminum alloy[J].Journal of Aeronautical Materials,2009,29(3):23-25.
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[16]白新德.材料腐蚀与控制[M].北京:清华大学出版社,2005.
[2]傅志红,贺地求,周鹏展.7A52铝合金搅拌摩擦焊焊核的组织分析[J].焊接学报,2006,27(5):65-69.Fu Zhihong,He Diqiu,Zhou Pengzhan.Microstructure analysis of7A52 aluminum alloy friction stir welding nugget[J].Transactions of the China Welding Institution,2006,27(5):65-69.
[3]付春坤,白钢,王红宾.7050铝合金搅拌摩擦焊接头组织特征研究[J].航空精密制造技术,2012,48(3):49-51.Fu Chunkun,Bai Gang,Wang Hongbin.Research on microstructure characteristics of 7050 aluminum alloy friction stir welding joint[J].Aviation Precision Manufacturing Technology,2012,48(3):49-51.
[4]Pang J J,Liu F C,Liu J,et al.Friction stir processing of aluminium alloy AA7075:microstructure,surface chemistry and corrosion resistance[J].Corrosion Science,2016,106:217-228.
[5]李奇,赵军军,马琳,等.7A52铝合金搅拌摩擦焊焊核的电化学局部腐蚀行为[J].中国表面工程,2010,23(5):79-85.Li Qi,Zhao Junjun,Ma Lin,et al.Electrochemical local corrosion behavior of 7A52 aluminum alloy friction stir welding nugget[J].China Surface Engineering,2010,23(5):79-85.
[6]赵军军,李奇,蔡志海,等.应变速率条件下第二相对7A52铝合金搅拌摩擦焊焊核应力腐蚀性能的影响[J].焊接学报,2013,34(8):63-66.Zhao Junjun,Li Qi,Cai Zhihai,et al.Effect of second relative7A52 aluminum alloy friction stir welding on stress corrosion corrosion characteristics under strain rate conditions[J].Transactions of the China Welding Institution,2013,34(8):63-66.
[7]张平,李奇,赵军军.7A52铝合金搅拌摩擦焊接头第二相分析及微区电位测试[J].中国有色金属学报,2011,21(6):1252-1257.Zhang Ping,Li Qi,Zhao Junjun.Analysis of secondary phases and measurement of volta potential of 7A52 aluminum alloy[J].Chinese Journal of Nonferrous Metals,2011,21(6):1252-1257.
[8]姜玉恒,刘金合,周卫涛.7050铝合金搅拌摩擦焊接头微观组织及力学性能分析[J].电焊机,2012,42(7):86-89.Jiang Yuheng,Liu Jinhe,Zhou Weitao.Microstructure and mechanical properties of 7050 aluminum alloy friction stir welding joint[J].Electric Welding Machine,2012,42(7):86-89.
[9]Paglia C S,Buchheit R G.A look in the corrosion of aluminum alloy friction stir welds[J].Scripta Materialia,2008,58:383-387.
[10]索相波,邱冀,张建辉.7A52铝合金表面微弧氧化陶瓷层摩擦学特性[J].中国表面工程,2009,29(8):61-65.Suo Xiangbo,Qiu Ji,Zhang Jianhui.Tribological properties of microarc oxidation ceramic layer on 7A52 aluminum alloy[J].China Surface Engineering,2009,29(8):61-65.
[11]Xue W B,Wang C,Tian H.Corrosion behaviors and galvanic studies of micro arc oxidation films on Al-Zn-Mg-Cu alloy[J].Surface&Coatings Technology,2007,201:8695-8701.
[12]张平,李奇,赵军军,等.7A52铝合金搅拌摩擦焊接头第二相的形貌及相组成[J].沈阳工业大学学报,2011,33(3):246-264.Zhang Ping,Li Qi,Zhao Junjun,et al.Morphology and phase composition of the second phase of 7A52 aluminum alloy friction stir welded joints[J].Journal of Shenyang University of Technology,2011,33(3):246-264.
[13]苗景国,王泽忠,沈钰.铝合金微弧氧化陶瓷膜层相组成述评及分析[J].轻合金加工技术,2015,43(4):21-24.Miao Jingguo,Wang Zezhong,Shen Yu.Review and analysis of phase composition of micro-arc oxidation ceramic coating on aluminum alloy[J].Light Alloy Processing Technology,2015,43(4):21-24.
[14]李忠盛,吴护林,潘复生,等.氧化时间对7A55铝合金微弧氧化膜的影响[J].航空材料学报,2009,29(3):23-25.Li Zhongsheng,Wu Hulin,Pan Fusheng,et al.Effect of oxidation time on micro-arc oxidation film of 7A55 aluminum alloy[J].Journal of Aeronautical Materials,2009,29(3):23-25.
[15]Walsh F C,Low C T J,Wood R J K.Plasma electrolytic oxidation(PEO)for production of anodised coatings on light weight metal(Al,Mg,Ti)alloys[J].Transactions of the IMF,2013,87(3):122-135.
[16]白新德.材料腐蚀与控制[M].北京:清华大学出版社,2005.