Characterization of Atmospheric Corrosion of 2A12 Aluminum Alloy in Tropical Marine Environment
Characterization of Atmospheric Corrosion of 2A12 Aluminum Alloy in Tropical Marine Environment
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DOI：
10.1007/s11665-009-9506-7
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发表时间：
2010-06-01
影响因子：
2.3
通讯作者：
Cheng, Y. F.
中科院分区：
文献类型：
--
作者：
Li, T.;Li, X. G.;Cheng, Y. F.
采用扫描电子显微镜、X射线能谱、X射线光电子能谱和X射线衍射等表面分析技术对2A12铝合金在南海大气中自然暴露3个月后形成的腐蚀产物进行了表征。分析了铝合金在海洋环境中的大气腐蚀机理。结果表明，铝合金试样发生了严重的全面腐蚀和点蚀。Al和O在产物膜中富集，Ca和Cl也存在于产物膜和铝合金基体的腐蚀坑中。薄膜中主要成分为Al_2O_3、Al（OH）_3和AlOOH，同时还含有AlCl_3和CaCO_3。铝合金在热带海洋大气中会发生腐蚀。铝合金表面形成的膜虽然具有一定的保护作用，但仍会受到氯离子的侵蚀，导致铝合金发生严重的点蚀。
In this work, corrosion product formed on 2A12 aluminum (Al) alloy after 3 months of natural exposure in South China Sea atmosphere was characterized by various surface analysis techniques, including scanning electron microscopy, energy-dispersive x-ray analysis, x-ray photoelectron spectroscopy, and x-ray diffraction. The atmospheric corrosion mechanism of Al alloy in marine environment was derived. Results demonstrated that Al alloy specimen experiences serious general corrosion and pitting corrosion. Al and O are enriched in the product film, and Ca and Cl are also found in the film and corrosion pits in Al alloy substrate. The main component compounds existing in the film include Al2O3, Al(OH)(3), and AlOOH while AlCl3 and CaCO3 are also identified. Al alloy encounters corrosion under tropical marine atmosphere. Although somewhat protective, the formed surface film on Al alloy specimen is attacked by chloride ions, resulting in significant pitting corrosion of Al alloy.