Corrosion behavior of aluminum alloys in Na₂SO₄ solution using the scanning electrochemical microscopy technique

He-rong Zhou1,2) ,Xiao-gang Li1,2) ,Chao-fang Dong1) ,Kui Xiao1) ,and Tai Li1) 1) School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) Beijing Key Laboratory for Corrosion,Erosion and Surface Technology,Beijing 100083,China

摘 要：The corrosion behavior of aluminum alloys 1060 and 2A12 in a 10 mM Na2SO4+5 mM KI solution was investigated by scanning electrochemical microscopy（SECM） and scanning electron microscopy（SEM） . The potential topography and corrosion morphology results show that the potential of the sample surface over the same area changes with the increase of immersion time. The corrosion area becomes large,and the potential becomes more negative. The corrosion potential of the 2A12 alloy surface is lower than that of 1060 aluminum,and 2A12 alloy becomes easily corrosive. This is the reason that preferential dissolution in the boundary region of some intermetallic particles（IMPs） occurs and different dissolution behaviors are associated with different types of IMPs because of different potentials.

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