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通过分析Al-7Zn-0.1Sn-0.015Ga(质量分数,%)合金在3.5% NaCl溶液中的点蚀形貌及电化学阻抗谱(EIS)研究该合金的点蚀行为及扩展机理.结果表明:该合金析出相界面处由于Cl-吸附和微电池的共同作用优先溶解引发点蚀.蚀孔内金属离子浓度增加,Cl-向孔内迁移导致孔内Cl-浓度升高,同时孔内金属离子水解使孔内H+浓度升高,蚀孔迅速纵深发展.随着析出相溶解及孔深增加,腐蚀产物在蚀孔处堆积造成金属离子传质阻力增大,产生浓差极化导致蚀孔底部电位正移,纵向腐蚀速率减慢;回沉积在蚀孔处的Ga和Al形成Ga-Al汞齐,分离氧化膜使铝基体不断溶解,也使腐蚀产物不断脱落,使点蚀坑横向扩展.

参考文献

[1] 齐公台,邱于兵,蔡启舟,冉伟.固溶处理对Al-Zn-In阳极元素分布和电化学性能的影响[J].材料热处理学报,2009(01):75-79.
[2] W. Xiong;G. T. Qi;X. P. Guo .The Effect of Tellurium on the Al-Zn-In Anode[J].Journal of the Electrochemical Society,2011(3):C48-C54.
[3] 王璇.铟职业病案凸显政策疏漏[J].劳动保护,2008(09):34-37.
[4] S. M. A. Shibli;K. K. Binoj .Development of MnO_2-incorporated high performance aluminum alloy matrix sacrificial anodes[J].Journal of Applied Electrochemistry,2009(2):159-166.
[5] Alvarez O;Gonzalez C;Aramburo G;Herrera R;Juarez-Islas JA .Characterization and prediction of microstructure in Al-Zn-Mg alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):320-324.
[6] 文九巴,郝庆国,贺俊光,马景灵.Mg和RE合金化对Al-Zn-Bi合金阳极组织和电化学性能的影响[J].材料热处理学报,2011(11):99-104.
[7] 侯德龙,宋月清,李德富,杨玉卫.镧对Al-Sn-Bi牺牲阳极电化学性能的影响[J].中国稀土学报,2010(03):339-342.
[8] 贺俊光,文九巴,李旭东,王国伟,徐春花.Ga和Bi对Al-Zn-Sn牺牲阳极电化学性能的影响[J].中国有色金属学报(英文版),2011(07):1580-1586.
[9] 贺俊光,文九巴,李旭东,郝庆国.Al-Zn-Sn-Ga阳极腐蚀过程的电化学阻抗谱[J].中国有色金属学报,2012(01):187-193.
[10] 文九巴,王国伟,马景灵,贺俊光,史志红.Ga对Al-Zn-Sn系阳极合金电化学性能的影响[J].材料热处理学报,2010(08):30-33,39.
[11] 文九巴;马景灵;王国伟 等.一种铝锌锡系牺牲阳极材料[P].中国:ZL 2009 1 0308983.4,2011.
[12] 周玉.材料分析方法[M].北京:机械工业出版社,2011:195-198.
[13] Venugopal A;Raja V S .AC impedance study on the activation mechanism of aluminum by indium and zinc in 3.5% NaCl medium[J].Corrosion Science,1997,39(12):2053-2065.
[14] T. J. Luo;Y. S. Yang;Y. J. Li;X. G. Dong .Influence of rare earth Y on the corrosion behavior of as-cast AZ91 alloy[J].Electrochimica Acta,2009(26):6433-6437.
[15] G. S. Frankel .Pitting corrosion of metals --A review of the critical factors[J].Journal of the Electrochemical Society,1998(6):2186-2198.
[16] 曹楚南.腐蚀电化学原理[M].北京:化学工业出版社,2004:291-293.
[17] Maria Nestoridi;Derek Pletcher;Robert J.K. Wood;Shuncai Wang;Richard L. Jones;Keith R. Stokes;Ian Wilcock .The study of aluminium anodes for high power density Al/air batteries with brine electrolytes[J].Journal of Power Sources,2008(1):445-455.
[18] Tuck C D S;Hunter J A;Scamans G M .Electrochemical behavior of Al-Ga alloys in alkaline and neutral electrolytes[J].Journal of the Electrochemical Society,1987,134(12):2970-2981.
[19] Breslin C B;Carroll W M .Electrochemical behaviour of aluminium activated by gallium in aqueous electrolytes[J].Corrosion Science,1992,33(11):1735-1739.
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