2024铝合金在中国西部盐湖大气环境中的局部腐蚀行为*
王彬彬, 男, 1985年生, 博士生
收稿日期: 2013-07-16
修回日期: 2013-07-16
网络出版日期: 2014-01-11
基金资助
*国家自然科学基金重点项目51131007和国防技术基础项目H102011B002资助
LOCALIZED CORROSION OF ALUMINUM ALLOY 2024 EXPOSED TO SALT LAKE ATMOSPHERIC ENVIRONMENT IN WESTERN CHINA
Received date: 2013-07-16
Revised date: 2013-07-16
Online published: 2014-01-11
Supported by
Supported by National Natural Science Foundation of China No.51131007 and Foundation Project of National Defense Technology No.H102011B002
通过4 a的现场大气暴露实验, 利用SEM/EDS, OM, XRD技术和电化学测试技术, 研究了包/不包铝的2024铝合金在中国西部盐湖大气环境中的局部腐蚀行为. 结果表明, 包/不包铝的2024铝合金在盐湖大气环境中发生了严重的点蚀, 暴露2 a后, 包铝层已被腐蚀穿透; 不包铝的2024铝合金最大点蚀深度已达约320 μm, 个别位置发生穿孔. 包/不包铝的2024铝合金的主要腐蚀产物都是层状双金属氢氧化物—[Mg1-xAlx(OH)2]x+ (Cl-, CO2-)x·mH2O. 电化学测试分析结果表明, 随Cl-浓度的升高, 2024铝合金的开路电位不断降低, 耐蚀性变差.
王彬彬 , 王振尧 , 曹公望 , 刘艳洁 , 柯伟 . 2024铝合金在中国西部盐湖大气环境中的局部腐蚀行为*[J]. 金属学报, 2014 , 50(1) : 49 -56 . DOI: 10.3724/SP.J.1037.2013.00417
Localized corrosion behavior of aluminum alloy 2024 with/without cladding exposed to salt lakes atmospheric environment in western china for 4 a was investigated. The depth of pitting, corrosion products, morphology of surface and cross-section, and corrosion potential were analyzed by SEM/EDS, OM, XRD and electrochemical analysis system. The results showed that 2024 suffered severe pitting corrosion. The cladding layer of aluminum alloy 2024 exposed for 2 a had been penetrated. Depth of pitting of aluminum alloy 2024 without cladding after 2 a exposure had reached 320 μm; meanwhile, few pitting that penetrated the whole substrate of aluminum alloy 2024 without cladding had been observed. A main corrosion product of aluminum alloy 2024 with/without cladding—[Mg1-xAlx(OH)2]x+ (Cl-, CO2-)x·mH2O (layered double hydroxides, LDH) was determined. Also, the results of electrochemistry indicated that the corrosion potential of aluminum alloy 2024 decreased gradually with the concentration of Cl- increasing. The effects of factors of salt lake atmospheric environments, corrosion product and Cl- concentration on the corrosion behavior of 2024 with/without cladding were discussed.
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