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金属学报  2014, Vol. 50 Issue (1): 49-56    DOI: 10.3724/SP.J.1037.2013.00417
  论文 本期目录 | 过刊浏览 |
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 王振尧 曹公望 刘艳洁 柯 伟
(中国科学院金属研究所金属腐蚀与防护国家重点实验室, 沈阳 110016)
LOCALIZED CORROSION OF ALUMINUM ALLOY 2024 EXPOSED TO SALT LAKE ATMOSPHERIC ENVIRONMENT IN WESTERN CHINA
WANG Binbin, WANG Zhenyao, CAO Gongwang, LIU Yanjie, KE Wei
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
全文: PDF(10179 KB)   HTML
摘要: 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.
关键词 2024铝合金盐湖大气腐蚀点蚀腐蚀产物    
Abstract: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.
Key wordsaluminum alloy 2024    salt lake    atmospheric corrosion    pitting corrosion    corrosion product
收稿日期: 2013-07-16     
ZTFLH:  TG178  
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
Corresponding author: Corrospendent: WANG Zhenyao, professor, Tel: (024)23893544, E-mail: zhywang@imr.ac.cn   
作者简介: 王彬彬, 男, 1985年生, 博士生

引用本文:

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.
WANG Binbin, WANG Zhenyao, CAO Gongwang, LIU Yanjie, KE Wei. LOCALIZED CORROSION OF ALUMINUM ALLOY 2024 EXPOSED TO SALT LAKE ATMOSPHERIC ENVIRONMENT IN WESTERN CHINA. Acta Metall Sin, 2014, 50(1): 49-56.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00417      或      https://www.ams.org.cn/CN/Y2014/V50/I1/49

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