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| LONG-TERM ATMOSPHERIC CORROSION BEHAVIOR OF LY12 ALUMINIUM ALLOY |
| SUN Shuangqing; ZHENG Qifei; LI Defu; CHEN Jie; WEN Junguo |
| General Research Institute for Nonferrous Metals; Beijing 100088; China |
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Abstract Atmospheric corrosion behavior of LY12 was investigated in five typical atmospheres in China over 20 years. Mass loss and loss in mechanical properties were measured; Appearance, cross-section photomicrograph and corrosion products were observed and analyzed by optical microscope and XRD. The results show that in hot and humid atmosphere of Wanning and Qionghai exfoliation corrosion occurred on LY12 after 6 and 10 years, respectively, and almost lost its mechanical properties after 20 years exposure. While in Beijing atmosphere, LY12 still performed excellent mechanical properties after 20 years exposure. The mass loss data were higher in Jiangjin and Qingdao due to higher average RH and SO2 or Cl- contamination of the atmosphere, and lowest in Beijing atmosphere because of lower average RH. Before exfoliation corrosion occurred, the mass loss data with exposure time obeyed well with power function C=KTn. The main exfoliation corrosion products are γ-Al(OH)3 and α-Al2O3．3H2O.
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Received: 08 September 2008
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Corresponding Authors:
ZHENG Qifei
E-mail: zhengqf@grinm.com
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