Corrosion behavior on aluminum alloy LY12 in simulated atmospheric corrosion process

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. 2; pp. 326 - 334
• Main Author: 王振尧 马腾 韩薇 于国才
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2007; Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China
• 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; surface analysis; accelerated corrosion test; electrochemical measure; atmospheric corrosion; aluminum alloy
• ISSN: 1003-6326
• DOI: 10.1016/s1003-6326(07)60093-4

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.