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Exfoliation Corrosion Behavior of 2A02 Al-alloy in a Simulated Marine Atmospheric Environment |
Min CAO1,2, Li LIU1(), Zhongfen YU3, Ying LI1, Fuhui WANG1,3 |
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 University of Chinese Academy of Sciences, Beijing 100049, China 3 Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China |
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Abstract The exfoliation corrosion behavior of 2A02 Al-alloy plates in a simulated marine atmospheric environment was studied by means of weight loss measurement. Namely, the plates were covered with a deposit of 4 mg/cm2 solid NaCl and then tested at 60 ℃ in air with 72% humidity. The microstructure and corrosion products of the alloy were characterized by SEM, XPS, LSCM,TEM and EPMA etc. Results show that in the simulated marine atmospheric environment, the corrosion process of 2A02 Al-alloy experienced the following three successive stages, i.e. pitting corrosion, intergranular corrosion and exfoliation corrosion. It seems that the second phase particles, which situated at grain boundaries, may play a key role for the initiation of pitting corrosion, while the rapid diffusion of Cl- along grain boundaries may act as a promoting factor for intergranular corrosion.
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Received: 02 November 2017
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Fund: Supported by National Natural Science Foundation of China (51622106) |
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