7A04-T6铝合金中金属间化合物对其阳极氧化膜耐蚀性的影响
Effects of Inter-metallic Particles on Corrosion Resistance of Anodic Films on 7A04-T6 Aluminium Alloy
摘 要
为研究7A04-T6铝合金中金属间化合物对其阳极氧化膜耐蚀性的影响，采用激光共聚焦显微镜对热挤压7A04-T6铝合金棒材不同方向截面的金相组织进行观察，并借助背散射和能谱鉴别组织中尺寸较大的金属间化合物颗粒，然后观察试样上含有金属间化合物区域在阳极氧化前、后和腐蚀不同时间后的形貌，并对腐蚀不同时间后的试样进行电化学阻抗谱(EIS)测试。结果表明，7A04-T6铝合金中尺寸较大的金属间化合物颗粒导致的阳极氧化膜孔洞是阳极氧化膜底部腐蚀、氧化膜破裂和最终完全失效的原因。
金属间化合物相
阳极氧化膜
耐蚀性
电化学阻抗谱
7A04-T6 aluminium alloy
inter-metallic particle
anodic film
corrosion resistance
EIS
Abstract
In order to study the effects of inter-metallic particles on the corrosion resistance of anodic films on 7A04-T6 aluminium alloy, the metallographic microstructure of hot extrusion rod of 7A04-T6 aluminium alloy was observed by scanning laser confocal microscopy. The inter-metallic particles were identified by backscattered electron image. The morphologies of the areas with inter-metallic particles were traced before and after anodization and after immersion in exfoliation corrosion liquid for different times. The electrochemical impedance spectroscopy (EIS) was measured. The results indicated that the cavities caused by larger inter-metallic particles in the anodic films on 7A04 aluminium alloy were responsible for the corrosion beneath anodic films, the cracking and final complete failure of anodic films.
中图分类号 TG174
所属栏目 试验研究
基金项目 国家自然科学基金(51201144); 中国博士后科学基金(2013M542288); 中央高校基本科研业务费专项资金(SWJTU12CX011); 中央高校基本科研业务费科技创新项目(SWJTU11CX051; 2682013CX003); 中国科学院无机特种涂层重点实验室开放基金(KLICM-2012-08)
收稿日期 2014/1/24
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联系人作者戴光泽(g.dai@163.com)
备注戴光泽(1963-)，教授，博导，从事材料服役行为及强度评价研究，
引用该论文: XU Yue-ting,GAO Jie-wei,WANG Chao-qun,ZHANG Kun,ZHAO Jun-wen,DAI Guang-ze. Effects of Inter-metallic Particles on Corrosion Resistance of Anodic Films on 7A04-T6 Aluminium Alloy[J]. Corrosion & Protection, 2014, 35(11): 1078
被引情况:
【1】张光耀,王成磊,高原,韦文竹,陆小会,张焱,吴炜钦, "铝合金表面2%CeO2/Ni60A激光熔覆层的组织及耐腐蚀性能",机械工程材料 39, 69-72(2015)
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【3】杨守杰，戴圣龙. 航空铝合金的发展回顾与展望[J]. 材料导报，2005，2:76-80.
【4】DENG Y,Yin Z. Effects of Sc and Zr microalloying additions and aging time at 120 ℃ on the corrosion behaviour of an Al-Zn-Mg alloy[J]. Corrosion Science,2012,65:288-298.
【5】LUO C,ZHOU X. Observations of intergranular corrosion in AA2024-T351:The influence of grain stored energy[J]. Corrosion Science,2012,61:35-44.
【6】BIRbILIS N,BUCHHEIT R. Electrochemical characteristics of intermetallic phases in aluminum alloys:an experimental survey and discussion[J]. Journal of The Electrochemical Society,2005,152(4):140-151.
【7】BOAG A,HUGHES A. Corrosion of AA2024-T3 Part I:Localised corrosion of isolated IM particles[J]. Corrosion Science,2011,53(1):17-26.
【8】YOON Y,BUCHHEIT R. Dissolution behavior of Al2CuMg (S phase) in chloride and chromate conversion coating solutions[J]. Journal of The Electrochemical Society,2006,153(5):151-155.
【9】GUILLAUMIN V,MANKOWSKI G. Localized corrosion of 2024 T351 aluminium alloy in chloride media[J]. Corrosion Science,1998,41(3):421-438.
【10】HUGHES A,BOAG A. Corrosion of AA2024-T3 Part II:Co-operative corrosion[J]. Corrosion Science,2011,53(1):27-39.
【11】GLENN A,MUSTER T. Corrosion of AA2024-T3 Part III:Propagation[J]. Corrosion Science,2011,53(1):40-50.
【12】WARNER J S,GANGLOFF R P. Molybdate inhibition of corrosion fatigue crack propagation in precipitation hardened Al-Cu-Li[J]. Corrosion Science,2012,62:11-21.
【13】LI X D,WANG X S. Effect of prior corrosion state on the fatigue small cracking behaviour of 6151-T6 aluminum alloy[J]. Corrosion Science,2012,55:26-33.
【14】张有宏. 飞机结构的腐蚀损伤及其对寿命的影响[D]. 西安:西北工业大学硕士学位论文，2007:1-7.
【15】LE B,JOIRET N S. The role of chromate conversion coating in the filiform corrosion of coated aluminum alloys[J]. Journal of The Electrochemical Society,2003,150(12):561-566.
【16】PALIBRODA E,FARCAS T. A new image of porous aluminium oxide[J]. Materials Science and Engineering,1995, B32(1):1-5.
【17】LIU Y,SKELDON P. Chromate conversion coatings on aluminium-copper alloys[J]. Corrosion Science,2005,47(2):341-354.
【18】GrILLI R,BAKER M A. Corrosion behaviour of a 2219 aluminium alloy treated with a chromate conversion coating exposed to a 3.5% NaCl solution[J]. Corrosion Science,2011,53(4):1214-1223.
【19】AKID R,GOBARA M. Corrosion protection performance of novel hybrid polyaniline/sol-gel coatings on an aluminium 2024 alloy in neutral, alkaline and acidic solutions[J]. Electrochimica Acta,2011,56(5):2483-2492.
【20】DIAS S,LAMAKA S. Sol-gel coatings modified with zeolite fillers for active corrosion protection of AA2024[J]. Corrosion Science,2012,62:153-162.
【21】WANG D,BIERWAGEN G P. Sol-gel coatings on metals for corrosion protection[J]. Progress in organic coatings,2009,64(4):327-338.
【22】RIVERA B F,JOHNSON B Y. Deposition and characterization of cerium oxide conversion coatings on aluminum alloy 7075-T6[J]. Surface and Coatings Technology,2004,176(3):349-356.
【23】HAO L,CHENG B R. Sealing processes of anodic coatings-past,present,and future[J]. Metal Finishing,2000,98(12):8-18.
【24】LOPEZ V,OTERO E. Sealing of anodic films obtained in oxalic acid baths[J]. Surface and Coatings Technology,2000,124(1):76-84.
【25】REN J,ZUO Y. The growth mechanism of pits in NaCl solution under anodic films on aluminum[J]. Surface and Coatings Technology,2005,191(2):311-316.
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