Corrosive Behavior Study of Q235 Steel Coated with Epoxy Composites in Substation Environment
Yong Li, Jin Fu, Wei Chen, Wenjing Yang, Xueming Li, Yanjun Yin, Qihui Wang
Available Online March 2017.
- https://doi.org/10.2991/ifmca-16.2017.86How to use a DOI?
- Electrochemical impedance spectroscopy; Epoxy coating; Anti-corrosion.
- In this work, the epoxy composite coating composited by zinc rich epoxy primer and silver epoxy enamel, was sprayed on the surface of Q235 steel. The anticorrosion of as-prepared samples in substation environment with atmospheric exposure for 18 months, and in 5% NaCl aqueous solution for 250 days were evaluated and compared, respectively. Electrochemical impedance spectroscopy (EIS) was employed to analyze the corrosive behavior of epoxy composite coating in 5% NaCl aqueous solution, the weather resistance and salt resistance were also evaluated. Additionally, the structure changes of epoxy composite coating induced by salt immersion and atmospheric exposure were characterized by fourier transform infrared (FT-IR). The results are demonstrated that the epoxy composite coating is corroded to be invalid after immersed into 5% NaCl aqueous solution for 250 days, which the impedance decreases from 3.967×109 •cm2 to 9.780×102 •cm2. The mechanism of corrosion is proposed that the corrosive medium gradually penetrate into the composite coating to form micro electric circuit through micro pores, resulting in the increase of porosity and corrosive rate for the composite coating. However, the impedance of epoxy composite coating in substation environment for 18 months is still 2.708×106 •cm2, indicating the good corrosion resistance.
- Open Access
- This is an open access article distributed under the CC BY-NC license.
Cite this article
TY - CONF AU - Yong Li AU - Jin Fu AU - Wei Chen AU - Wenjing Yang AU - Xueming Li AU - Yanjun Yin AU - Qihui Wang PY - 2017/03 DA - 2017/03 TI - Corrosive Behavior Study of Q235 Steel Coated with Epoxy Composites in Substation Environment BT - Proceedings of the 2016 International Forum on Mechanical, Control and Automation (IFMCA 2016) PB - Atlantis Press SP - 561 EP - 566 SN - 2352-5401 UR - https://doi.org/10.2991/ifmca-16.2017.86 DO - https://doi.org/10.2991/ifmca-16.2017.86 ID - Li2017/03 ER -