Corrosion behavior of aluminum alloys in Na_2SO_4 solution using the scanning electrochemical microscopy technique  

作　　者：He-rong Zhou Xiao-gang Li Chao-fang Dong Kui Xiao Tai Li 

机构地区：[1]School of Materials Science and Engineering, University of Science and Technology Bei.jing, Beijing 100083, China [2]Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, Beijing 100083, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2009年第1期84-88,共5页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50499331);the National Science and Technology Basic Conditional Platform (No.2005DTA10400)

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.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.

关 键 词：aluminum alloys corrosion behavior intermetallic particles scanning electrochemical microscopy （SECM） 

分 类 号：TG146.21[一般工业技术—材料科学与工程] O613.71[金属学及工艺—金属材料]