Corrosion behavior and protection mechanism of carbon steel coated with ethylene chlorotrifluoroethylene(ECTFE)  

作　　者：Peihu SHEN Jun WEN Biqin DONG Hedong LI Minjia WANG 

机构地区：[1]School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou,310018,China [2]College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518061,China [3]Zhejiang Research Institute of Chemical Industry Co.,Ltd.,Hangzhou,310023,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2024年第6期502-515,共14页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the Zhejiang Postdoctoral Merit-Based Funding(No.ZJ2020030);the China Postdoctoral Science Foundation(No.2020M681920);the Zhejiang Sci-Tech University Youth Innovation Program(No.2021Q038),China.

摘　　要：Ethylene chlorotrifluoroethylene(ECTFE)coating was applied to the surface of carbon steel through electrostatic spraying and low-temperature heat treatment.The morphology and structure of the coating were analyzed using various characterization techniques.The electrochemical data of the coated steel soaked in 3.5%(mass fraction)NaCl solution for 90 d at different periods were also examined.The findings indicate that the outer surface of the coating remains structurally stable before and after soaking.F can diffuse into the steel substrate,facilitating the bonding between the coating and the steel substrate,but the free F also induces a weakening effect on the crystalline structure.Due to the thickness of the coating edge and the susceptibility to infiltration of the corrosive medium,under-film micro-zone corrosion occurs at a slow rate.After soaking for 90 d,the impedance modulus measures approximately 10^(4)Ω·cm^(2),and the open circuit potential(OCP)is−0.61 V.The self-corrosion current density is 1.13×10^(−6)A/cm^(2),resulting in a calculated coating protection rate of 99.29%.In summary,despite edge corrosion occurring,the ECTFE coating provides excellent corrosion protection.

关 键 词：Coating Fluorine resin Edge corrosion Corrosive behavior Electrochemical performance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]