Corrosion of Carbon Steel under Epoxy-varnish Coating Studied by Scanning Kelvin Probe  

作　　者：肖葵 李晓刚 

机构地区：[1]Advanced Material & Technology Institute,University of Science & Technology Beijing

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2012年第5期825-829,共5页武汉理工大学学报（材料科学英文版）

基　　金：the National Natural Science Foundation of China (Nos.50871021and50701006)

摘　　要：The corrosion behavior of partly coated carbon steel was investigated by salt spray test and scanning Kelvin probe （SKP） in order to understand the long-term corrosion behavior of coated carbon steel in marine atmosphere environment. The localized corrosion was accurately characterized by SKP in both coated and uncoated regions. The SKP results showed that Volta potential varied with the test time, and the more the corrosion products, the more positive the potential. The borderline between coated and uncoated regions of partly coated steel shifted towards the coated side with the increasing of test time. The coating disbonding rate could be determined according to the shift of potential borderline measured by SKP. The corrosion mechanism of partly coated steel in NaCl salt spray was discussed according to the potential maps and corrosion morphologies.The corrosion behavior of partly coated carbon steel was investigated by salt spray test and scanning Kelvin probe （SKP） in order to understand the long-term corrosion behavior of coated carbon steel in marine atmosphere environment. The localized corrosion was accurately characterized by SKP in both coated and uncoated regions. The SKP results showed that Volta potential varied with the test time, and the more the corrosion products, the more positive the potential. The borderline between coated and uncoated regions of partly coated steel shifted towards the coated side with the increasing of test time. The coating disbonding rate could be determined according to the shift of potential borderline measured by SKP. The corrosion mechanism of partly coated steel in NaCl salt spray was discussed according to the potential maps and corrosion morphologies.

关 键 词：carbon steel coating salt spray test scanning kelvin probe 

分 类 号：TG174.44[金属学及工艺—金属表面处理]