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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 2    April 2007

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Corrosion behavior on aluminum alloy LY12
in simulated atmospheric corrosion process
WANG Zhen-yao(王振尧), MA Teng(马 腾),
HAN Wei(韩 薇), YU Guo-cai(于国才)

Environmental Corrosion Center, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China

Abstract: 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 NaCl 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 HOS−3 exists, LY12 can react much intensely with HOS−3 derived from anions.

 

Key words: aluminum alloy; atmospheric corrosion; accelerated corrosion test; surface analysis; electrochemical measure

ISSN 1672-7029
CN 43-1423/U

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