Preparation and Anticorrosive Performance of Waterborne Epoxy Resin Composite Coating with Amino-Modified Graphene Oxide

Author:

Nan Ding123ORCID,Li Xin2ORCID,Li Dongsheng3,Liu Qiong1,Wang Biao1,Gao Xin2,Ma Ting2,He Na4,Xu Yu1,Dong Junhui3

Affiliation:

1. Inner Mongolia Enterprise Key Laboratory of High Voltage and Insulation Technology, Inner Mongolia Power Research Institute Branch, Inner Mongolia Power (Group) Co., Ltd., Hohhot 010020, China

2. College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China

3. Inner Mongolia Key Laboratory of Graphite and Graphene for Energy Storage and Coating, School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

4. Inner Mongolia Institute of Metrology and Testing, Hohhot 010050, China

Abstract

A waterborne epoxy coating with superior corrosion resistance was developed by using a novel amino-functionalized graphene oxide (GO) that was modified by 2,5-diaminobenzenesulfonic acid. A battery of characterization methods, such as Fourier transform infrared spectroscopy (FT-IR), Raman spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), was used to prove that DGO was successfully prepared by grafting the amino of 2,5-diaminobenzenesulfonic on GO. The results indicated that the surface of DGO became rougher than GO, but a complete sheet structure was still maintained after modification; the optimal modified GO could be achieved when the mass ratio of 2,5-diaminobenzenesulfonic acid and GO was 5:1. The electrochemical impedance spectroscopy (EIS) tests indicated that the impedance at 0.01 Hz of a coating with 0.2 wt.% DGO still remained at a relatively high value after immersion for 48 h in 3.5 wt.% NaCl, which was about one order higher than a pure waterborne epoxy resin coating, and the corrosion current density decreased from 3.76 × 10−11 A/cm2 to 3.62 × 10−12 A/cm2. The dry adhesion and wet adhesion increased to 1.90 and 1.22 MPa, respectively, and the adhesion loss decreased from 53% to 36%. These interesting features could make waterborne epoxy coatings a promising anticorrosion coating for metal in long-term protection.

Funder

Inner Mongolia Scientific and Technological Achievements Transformation Project

Inner Mongolia Major Science and Technology Project

the Alashan League’s Project of Applied Technology Research and Development Fund

Basic Scientific Research Expenses Program of Universities directly under the Inner Mongolia Autonomous Region

the Postdoctoral Science Foundation of Inner Mongolia Electric Power (Group) Co., Ltd., the Local Science and Technology Development Project of the Central Government

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

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