AA6061-T6铝合金表面纳米Y2O3改性硅烷膜的耐蚀性
Corrosion Resistance of Silane Films Modified with Yttrium Oxide Nanoparticles on AA6061-T6 Al Alloy Surface
摘 要
采用动电位极化曲线，电化学阻抗谱(EIS)和中性盐雾试验(NSS)研究了溶液中加入不同含量纳米Y2O3对铝合金AA6061-T6表面硅烷膜耐蚀性的影响，采用扫描电镜(SEM)对其形貌进行了观察。结果表明，在1,2-双-三乙氧基硅烷(BTSE)溶液中加入少量纳米Y2O3可提高硅烷膜在3.5% NaCl溶液中的耐蚀性。硅烷膜对铝合金的保护只起到物理屏障作用。纳米Y2O3抑制了电化学腐蚀过程中阴极还原反应的发生，但不影响电极反应的动力特征。SEM表明在BTSE硅烷溶液中添加10~20 mg/L的纳米Y2O3后，硅烷膜表面变得平滑致密。
纳米Y2O3
耐蚀性能
铝合金
silane film
yttrium oxide nanoparticle
corrosion resistance
aluminum alloy
Abstract
The present work aims at evaluating the corrosion resistance of AA6061-T6 pre-treated with bis-1,2-[triethoxysiyl]ethane silane(BTSE) solution containing different contents of Y2O3 nanoparticles. The corrosion resistance of the pre-treated AA6061-T6 substrates was investigated with potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and neutral salt spray test (NSS). The morphology of silane film was observed using scanning electron microscopy (SEM). The results indicated that the presence of small amount of Y2O3 nanoparticles in BTSE solutions increased the corrosion resistance of the silane films in 3.5% NaCl solution. The formed silane film acts as a physical barrier for the protection of aluminum alloy. Y2O3 nanoparticles mainly inhibit the cathodic reduction reaction of electrochemical corrosion and do not change the dynamic behaviors of the electrode reaction of electrochemical corrosion. The scanning electron microscopy (SEM) images indicated that the surface morphology of silane films formed was flat and compact, when the contents of Y2O3 nanoparticles in BTSE solutions were between 10 mg/L and 20 mg/L.
中图分类号 TG174.46
所属栏目 试验研究
基金项目 河南省科技攻关计划项目(122102210478)
收稿日期 2013/12/16
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备注张圣麟(1960-),教授,博士,从事金属腐蚀与防护方面的研究,
引用该论文: ZHANG Ming-ming,LI Wen-chao,ZHANG Sheng-lin. Corrosion Resistance of Silane Films Modified with Yttrium Oxide Nanoparticles on AA6061-T6 Al Alloy Surface[J]. Corrosion & Protection, 2014, 35(11): 1122
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【3】唐维学，张小琴，杨改霞. 环境友好型铝合金表面钝化技术进展[J]. 腐蚀与防护，2010，31(4):272-275.
【4】BECCARIA A M,CHIARUTTINI L. The inhibitive action of metacryloxypropylmethoxysilane (MAOS) on aluminium corrosion in NaCl solutions[J]. Corrosion science,1999,41(5):885-899.
【5】ZHU D Q,VAN OOIJ W J. Corrosion protection of AA 2024-T3 by bis-[3-(triethoxysilyl)propyl]tetrasulfide in sodium chloride solution.Part 2:mechanism for corrosion protection[J]. Corrosion Science,2003,45(10):2177-2197.
【6】PALANIVEL V,ZHU D Q,VAN OOIJ W J. Nanoparticle-filled silane films as chromate replacements for aluminum alloys[J]. Progress in Organic Coatings,2003,47(3/4):384-392.
【7】季献武，时士峰，肖嵘，等. 硅烷处理对涂层/金属体系耐蚀性能的影响[J]. 腐蚀与防护，2012,33(12):1081-1085.
【8】ZHU D Q,VAN OOIJ W J. Corrosion protection of metals by water-based silane mixtures of bis-[trimethoxysilylpropyl]amine and vinyltriacetoxysilane[J]. Progress in Organic Coatings,2004,49(1):42-53.
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【10】VAN OOIJ W J,ZHU D,STACY M,et al. Corrosion protection properties of organofunctional silanes-An overview[J]. Tsinghua Science & Technology,2005,10(6):639-664.
【11】PALANIVELV,HUANG Y,VAN OOIJ W J. Effects of addition of corrosion inhibitors to silane films on the performance of AA2024-T3 in a 0.5 M NaCl solution[J]. Progress in Organic Coatings,2005,53(2):153-168.
【12】MONTEMOR M F,PINTOA R,FERREIRA M G S. Chemical composition and corrosion protection of silane films modified with CeO2 nanoparticles[J]. Electrochimica Acta,2009,54(22):5179-5189.
【13】BETHENCOURT M,BOTANA F J,CAUQUI M A,et al. Protection against corrosion in marine environments of AA5083 Al-Mg alloy by lanthanide chlorides[J]. Journal of Alloys and Compounds,1997,250(1/2):455-460.
【14】TRAN M,MOHAMMEDI D,FIAUD C,et al. Corrosion behaviour of steel in the presence of Y(III) salts:Kinetic and mechanistic studies[J]. Corrosion Science,2006,48(12):4257-4273.
【15】XIAO W,MAN R L,MIAO C,et al. Study on corrosion resistance of the BTESPT silane cooperating with rare earth cerium on the surface of aluminum-tube[J]. Journal of Rare Earths,2010,28(1):117-122.
【16】LENDVAY-GYRIK G,MSZROS G,LENGYEL B. A simple testing method for quality control of phosphate coatings based on impedance measurements[J]. Journal of Applied Electrochemistry,2002,32(8):891-896.
【17】曹楚南. 腐蚀电化学原理[M]. 第2版. 北京:化学工业出版社,2004.
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