Oxygen vacancy modified α-Fe2O3 nanorods provide an environment-friendly and efficient anti-corrosion passive film into polymer coating
Weihao Fan, Huaiyuan Wang, Chijia Wang, Zhanjian Liu, Zihua Wang, Shupei Liu, Yanji Zhu
Abstract
Oxygen vacancy modified Fe 2 O 3 (OV-Fe 2 O 3 ) nanorods were fabricated and then used as epoxy coating fillers. The OV-Fe 2 O 3 fillers passivates the steel substrate, because oxygen atoms can be stored in the vacancies to form a metastable state. Electrochemical impedance spectroscopy showed the impedance modulus of OV-Fe 2 O 3 coatings was about 10 5 times higher than general α-Fe 2 O 3 coatings after O 2 -high pressure and high-temperature corrosion. X-ray photoelectron spectroscopy and scanning vibrating electrode technique confirm OV-Fe 2 O 3 can continuously transport oxygen from the oxygen-rich environment to the substrate surface (oxygen-deficient environment) before the permeation of the corrosive medium, eventually achieving efficient passivation.