期刊
CARBON
卷 176, 期 -, 页码 39-51出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.01.135
关键词
Fluorinated reduced graphene oxide; Cerium oxide; Dispersibility; Corrosion resistance; Epoxy coating
资金
- Zhejiang Provincial Natural Science Foundation of China [LR21E050001]
- National Natural Science Foundation of China [51775540]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA13040601]
- Youth Innovation Promotion Association, CAS [2017338]
A facile strategy was developed to effectively eliminate the undesired feature of fluorinated graphene, enhancing the anti-corrosion properties of epoxy coating on mild steel surfaces. The developed nanofillers significantly reinforced the protection properties of the epoxy coatings through a physical barrier effect and insulating nature, combating galvanic corrosion. The proposed corrosion protection mechanism of the nanofillers could provide broader platforms for designing new corrosion protection materials.
Although fluorinated graphene (FG) inherits the physical barrier characteristic from graphene, its limited dispersibility seriously impedes its application in corrosion resistance. Here, this study aims to present a facile strategy to effectively eliminate this undesired feature of FG. We developed a well-dispersed cerium oxide grafting fluorinated reduced graphene oxide (FrGO@CeO2) nanofiller to enhance the anti-corrosion properties of epoxy coating on Q235 mild steel surfaces. The in situ F-doping and hydrothermal techniques were employed to synthesize FrGO@CeO2 nanofillers and functionalize them with waterborne epoxy coating. Combining the electrochemical results and the corrosion morphologies, the resultant nanofillers were found to significantly reinforce the protection properties of epoxy coatings due to the physical barrier effect derived from FrGO. In addition to impermeability, FrGO presented the insulating nature and endowed composite coatings to combat galvanic corrosion. Local electrochemical impedance spectroscopy (LEIS) indicated that cerium oxide adsorbed on mild steel surface could form a passive layer and thus further resisted the metal corrosion process. The related corrosion protection mechanism of FrGO@CeO2/EP coating was proposed in detail, which could provide broader platforms for designing new corrosion protection materials. (C) 2021 Elsevier Ltd. All rights reserved.
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