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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2300157


Corrosion behavior and protection mechanism of carbon steel coated with ECTFE


Author(s):  Peihu SHEN, Jun WEN, Biqin DONG, Hedong LI, Minjia WANG

Affiliation(s):  School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China; more

Corresponding email(s):   coolwangmin@zstu.edu.cn

Key Words:  Coating, Fluorine resin, Edge corrosion, Corrosive behavior, Electrochemical performance


Peihu SHEN, Jun WEN, Biqin DONG, Hedong LI, Minjia WANG. Corrosion behavior and protection mechanism of carbon steel coated with ECTFE[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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Abstract: 
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 3.5wt.%NaCl solution for 90 days 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 days, the impedance modulus measures approximately 104 Ω·cm2, 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.

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