Corrosion behavior on aluminum alloy LY12 in simulated atmospheric corrosion process

The corrosion behavior of typical high-strength aluminum alloy LY12 was studied by accelerated corrosion tests of cyclic wet-dry-immersion containing media of NaHSO3 and NaCI to simulate the corrosion process in different atmosphere environment, and the corrosion mechanism was also discussed. The ma...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2007-04, Vol.17 (2), p.326-334
Main Author: 王振尧 马腾 韩薇 于国才
Format: Article
Language:English
Subjects:
accelerated corrosion test
aluminum alloy
atmospheric corrosion
electrochemical measure
LY12
surface analysis
模拟大气腐蚀过程
腐蚀行为
铝合金
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Summary:The corrosion behavior of typical high-strength aluminum alloy LY12 was studied by accelerated corrosion tests of cyclic wet-dry-immersion containing media of NaHSO3 and NaCI to simulate the corrosion process in different atmosphere environment, and the corrosion mechanism was also discussed. The main experimental techniques include mass loss, morphological check, analysis of corrosion products and electrochemical measurement. The result shows that the mass loss of LY12, with or without cladding, has linear relationship with test time in the three kinds of chemical media, 0.02 mol/L NaHSO3, 0.006 mol/L NaCl and 0.02 mol/L NaHSO3＋0.006 mol/L NaCl, respectively. A layer of cladding on high-strength aluminum alloy can raise evidently the resistance of atmospheric corrosion. Cl^- can promote pitting generation on the oxide film of LY12 when HOS3 exists, LY12 can react much intensely with HOS3^- derived from anions.
ISSN:1003-6326
DOI:10.1016/s1003-6326(07)60093-4