| GAO Yan,LIU Cheng-bao,REN Si-ming,YE Yu-wei.Corrosion Resistance of Modified Waterborne Epoxy Coating by Tryptophan Functionalized Graphene[J],47(12):263-269 |
| Corrosion Resistance of Modified Waterborne Epoxy Coating by Tryptophan Functionalized Graphene |
| Received:July 10, 2018 Revised:December 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.12.035 |
| KeyWord:tryptophan graphene dispersibility corrosion resistance epoxy coating |
| Author | Institution |
| GAO Yan |
1.Ningbo Key Laboratory for Concrete Structure Durability, School of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo , China |
| LIU Cheng-bao |
2.Key Laboratory of Marine Materials and Related Technology, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo , China |
| REN Si-ming |
2.Key Laboratory of Marine Materials and Related Technology, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo , China |
| YE Yu-wei |
2.Key Laboratory of Marine Materials and Related Technology, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo , China |
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| Abstract: |
| The work aims to improve the dispersibility of graphene in the organic coating and give it a certain functionality to prepare a water-based epoxy composite coating with simple method, environmental friendliness and low cost. Graphene oxide was selected as raw material and EDC was chosen as condensing agent. At ambient temperature, a natural corrosion inhibitor was grafted on the surface of graphene oxide through amidation reaction. Tryptophan functionalized graphene was prepared by hydrazine reduction and then successfully dispersed into waterborne epoxy resin to obtain the tryptophan functionalized gra-phene/epoxy coating. FTIR, Raman, SEM and TEM were employed to analyze the laminate structure and morphology of func-tionalized graphene. The corrosion resistance of as-prepared coating in 3.5%NaCl solution was evaluated by electrochemical workstation. Tryptophan was successfully grafted onto the surface of graphene oxide, and the functionalized graphene exhibited excellent dispersibility in absolute ethanol and waterborne epoxy resin. In terms of protective performance, the functionalized graphene-based composite coating displayed the highest impedance modulus (107 Ω?cm2) and charge transfer resistance after 40 days of immersion compared to the blank and unmodified graphene-based composite coating. Meanwhile, the surface of metal substrate exhibited the slightest corrosion among all coatings after being covered by the functionalized graphene composite coating. Thus, the addition of functional graphene can significantly improve the corrosion resistance of waterborne epoxy coating. |
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