Electrochemical Corrosion Behavior of Arc Sprayed Zn and Zn15Al Coatings in Simulated Salina Soil and Neutral Meadow Soil Solutions  

作　　者：林碧兰 

机构地区：[1]Graduate School at Shenzhen,Tsinghua University,

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2011年第6期1152-1156,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the General Project of China Postdoctoral Science Foundation (20080440043);the Special Funded Project of China Postdoctoral Science Foundation (200902107);the Action Plan Project of Enterprise Scientific and Technological Envoys by Guangdong Province and Education Ministry,and the Science & Technology Ministry (2009B090600106)

摘　　要：Arc sprayed Zn and Zn15Al coatings were chosen to protect the metal ends of prestressed high-strength concrete （PHC） pipe piles against corrosion of salina soil in northern china and neutral meadow soil in northeast China. The corrosion behavior of the coated Q235 steel samples in two simulated soil solutions were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy （EIS） methods. The experimental results show that the corrosion of the matrix Q235 steel in both simulated solutions is remarkably inhibited by Zn and Zn15Al coatings. The corrosion products on Zn and Zn15Al are thick, compact, firm and protective. The corrosion current density icorr of both Zn and Zn15Al-coated samples is decreased evidently with corrosion time, and the charge transfer resistance Rct is increased greatly. The corrosion resistance indexes of Zn and Zn15Al in simulated neutral meadow soil solution are more outstanding than those in salina soil. The corrosion resistance of Zn15Al in salina soil is slightly superior to that of Zn. When the sprayed coatings are sealed with epoxy resin, the corrosion resistance of the coatings is further enhanced markedly.Arc sprayed Zn and Zn15Al coatings were chosen to protect the metal ends of prestressed high-strength concrete （PHC） pipe piles against corrosion of salina soil in northern china and neutral meadow soil in northeast China. The corrosion behavior of the coated Q235 steel samples in two simulated soil solutions were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy （EIS） methods. The experimental results show that the corrosion of the matrix Q235 steel in both simulated solutions is remarkably inhibited by Zn and Zn15Al coatings. The corrosion products on Zn and Zn15Al are thick, compact, firm and protective. The corrosion current density icorr of both Zn and Zn15Al-coated samples is decreased evidently with corrosion time, and the charge transfer resistance Rct is increased greatly. The corrosion resistance indexes of Zn and Zn15Al in simulated neutral meadow soil solution are more outstanding than those in salina soil. The corrosion resistance of Zn15Al in salina soil is slightly superior to that of Zn. When the sprayed coatings are sealed with epoxy resin, the corrosion resistance of the coatings is further enhanced markedly.

关 键 词：arc spray coating SOIL corrosion electrochemical 

分 类 号：TG174.44[金属学及工艺—金属表面处理]