7A04和2A12铝合金在吐鲁番干热大气环境中的腐蚀行为
Corrosion Behavior of 7A04 and 2A12 Aluminum Alloys in Hot and Dry Atmosphere Environment in Turpan
摘 要
采用现场暴晒试验，研究了7A04和2A12两种铝合金在吐鲁番干热大气环境中的腐蚀行为和机理。1 a暴露后的失重分析发现7A04的腐蚀速率大于2A12; 采用SEM和EDS观察分析了两种合金表面的腐蚀产物，结果表明，均主要由铝的氧化物和氢氧化物组成。去除腐蚀产物后， 7A04表面呈现大量密集腐蚀坑，而2A12表面腐蚀坑则较少。EIS结果表明，两种合金的腐蚀产物层电阻电容差别较大，带腐蚀产物2A12的耐蚀性优于7A04。
吐鲁番
干热大气
腐蚀
aluminum
Turpan
hot and dry atmosphere environment
corrosion
Abstract
The corrosion behavior and mechanism of 7A04 and 2A12 aluminum alloys exposed for 1 year in the hot and dry atmosphere environment in Turpan were studied. The results of weight lose tests showed that the corrosion rate of 7A04 aluminum alloy was greater than that of 2A12. The results of scanning electron microscopy(SEM) and energy dispersive spectra showed that the corrosion products on the surface of the aluminum alloys were composed of aluminum oxides and hydroxides. After removal of corrosion products, the number of corrosion pits on 7A04 aluminum alloy was more than that on 2A12. The results of electrochemical impedance spectroscopy showed that the resistance and capacitance of corrosion product layer had large difference between the two kinds of aluminum alloys, 2A12 aluminum alloy with corrosion products had better corrosion resistance than 7A04 aluminum alloy.
中图分类号 TG172.3
所属栏目 试验研究
基金项目 国家材料环境腐蚀平台(2005DKA10400); 吐鲁番干热大气环境材料腐蚀试验研究平台建设(PT1207)
收稿日期 2013/12/18
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备注李慧艳(1987-),博士研究生,从事金属腐蚀与防护工作,
引用该论文: LI Hui-yan,FANG Yue-hua,XIAO Kui,GUO Chun-yun,DONG Chao-fang,LI Xiao-gang. Corrosion Behavior of 7A04 and 2A12 Aluminum Alloys in Hot and Dry Atmosphere Environment in Turpan[J]. Corrosion & Protection, 2014, 35(11): 1098
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【2】李慧艳,方月华,肖葵,等. 干热大气环境中涂层材料失效行为研究进展[J]. 科技导报,2012,30(34):76-79.
【3】NING A L,LIU Z Y,ZENG S M. Effect of large cold deformation after solution treatment on precipitation characteristic and deformation strengthening of 2024 and 7A04 aluminum alloys[J]. Transactions of Nonferrous Metals Society of China,2006,16:1341-1347.
【4】DONG C F,SHENG H,AN Y H,et al. Corrosion of 7A04 aluminum alloy under defected epoxy coating studied by localized electrochemical impedance spectroscopy[J]. Progress in Organic Coatings,2010,67:269-273.
【5】WANG B,ZHANG L W,SU Y,et al. Investigation on the corrosion behavior of aluminum alloys 3A21 and 7A09 in chloride aqueous solution[J]. Materials & Design,2013,50:15-21.
【6】周和荣,李晓刚,董超芳,等. 7A04铝合金在薄液膜下的腐蚀行为[J]. 北京科技大学学报,2008,30(8):880-887.
【7】ZHOU H R,LI X G,DONG C F,et al. Corrosion behavior of aluminum alloys in Na2SO4 solution using the scanning electrochemical microscopy technique[J]. International Journal of Minerals,16(1):84-88.
【8】李涛,吴立凡,李相前,等. Cl-浓度对2A12铝合金电化学行为的影响[J]. 腐蚀与防护,2011,32(4):256-296.
【9】郑弃非,孙霜青,温军国. 铝及铝合金在我国的大气腐蚀及其影响因素分析[J]. 腐蚀与防护,2009,30(6):359-419.
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