7A04-T6铝合金在氯化钠溶液中的腐蚀行为及其对拉伸性能的影响
Corrosion Behavior of AA7A04-T6 in NaCl Solution and Its Influence on Tensile Strength
摘 要
采用激光共聚焦显微镜研究了7A04-T6铝合金在3.5% NaCl溶液中腐蚀形貌随时间的演变; 对浸泡试样进行了失重计算和拉伸性能测试, 并观察了拉伸断口形貌。结果表明, 在初始两周, 金属化合物周围的沟逐渐加深并向四周扩展, 这是失重的主要原因, 此时腐蚀对拉伸性能影响较小; 随后, 腐蚀产物在金属表面的沉积, 腐蚀面积的增加以及暴露出来的金属化合物粒子数量的增多导致腐蚀失重速度加快; 金属间化合物周围的沟连在一起并向基体深入, 造成拉伸试样颈缩现象弱化, 延伸率下降。
腐蚀形貌
失重
拉伸性能
7A04-T6
corrosion morphology
weight loss
tensile strength
Abstract
The corrosion behavior of AA7A04-T6 in 3.5% NaCl solution was studied. Weight loss was measured, the corrosion morphology was observed using scanning laser confocal microscopy. Tensile tests were used to study the influence of corrosion on the tensile strength of the specimens. The results show that the weight loss rate was low in the first two weeks, then enhanced by synergism of the deposition of corrosion product on the surface and the increase in both reaction area and newly exposed intermetallic particles. Corrosion led to the disappearance of necking phase in tensile tests gradually.
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);中国科学院无机特种涂层重点实验室开放基金(KLICM-2012-08);四川省科技成果转化项目(2012CC0012)
收稿日期 2013/5/31
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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: GAO Jie-wei,ZHANG Kun,XU Lei,DAI Guang-ze. Corrosion Behavior of AA7A04-T6 in NaCl Solution and Its Influence on Tensile Strength[J]. Corrosion & Protection, 2014, 35(3): 239
被引情况:
【1】刘元伟, "纳米SiO2-稀土元素复合改性环氧树脂防腐蚀涂料的耐蚀性",腐蚀与防护 36, 738-741(2015)
【2】朱成丽,李晓红,吴洪亮,叶建锋, "输电线路压接金具错位型缺陷引发的失效及其仿真研究",腐蚀与防护 36, 373-377(2015)
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【2】KADDEM M,TARDELLI J. Atomic emission spectroelectrochemical investigation of the anodization of AA7050T74 aluminum alloy[J]. Electrochemistry Communications,2011,13(1):42-45.
【3】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):B140-B151.
【4】BOAG A,HUGHES A. Corrosion of AA2024-T3 Part I: Localised corrosion of isolated IM particles[J]. Corrosion Science,2011,53(1):17-26.
【5】HUGHES A,BOAG A. Corrosion of AA2024-T3 Part II: Co-operative corrosion[J]. Corrosion Science,2011,53(1):27-39.
【6】GLENN A,MUSTER T. Corrosion of AA2024-T3 Part III: Propagation[J]. Corrosion Science,2011,53(1):40-50.
【7】LACROIX L,RESSIER L. Statistical study of the corrosion behavior of Al2CuMg intermetallics in AA2024-T351 by SKPFM[J]. Journal of the Electrochemical Society,2008,155(1):C8-C15.
【8】ZHOU X,LUO C. Study of localized corrosion in AA2024 aluminium alloy using electron tomography[J]. Corrosion Science,2012,58:299-306.
【9】JAIN S,LIM M. Spreading of intergranular corrosion on the surface of sensitized Al-4.4 Mg alloys: A general finding[J]. Corrosion Science,2012,59:136-147.
【10】BLANC C,FREULON A. Modelling the corrosion behaviour of Al2CuMg coarse particles in copper-rich aluminium alloys[J]. Corrosion Science,2006,48(11):3838-3851.
【11】WLOKA J,BVRKLIN G. Influence of second phase particles on initial electrochemical properties of AA7010-T76[J]. Electrochimica Acta,2007,53(4):2055-2059.
【12】BOAG A,TAYLOR R. Stable pit formation on AA2024-T3 in a NaCl environment[J]. Corrosion Science,2010,52(1):90-103.
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