Amino-Modified Graphene Oxide from Kish Graphite for Enhancing Corrosion Resistance of Waterborne Epoxy Coatings

Shengle Hao; Siming Wan; Shiyu Hou; Bowen Yuan; Chenhui Luan; Ding Nan; Gen Huang; Deping Xu; Zheng-Hong Huang

doi:10.3390/ma17051220

Amino-Modified Graphene Oxide from Kish Graphite for Enhancing Corrosion Resistance of Waterborne Epoxy Coatings

Materials (Basel). 2024 Mar 6;17(5):1220. doi: 10.3390/ma17051220.

Authors

Shengle Hao^{1

2}, Siming Wan¹, Shiyu Hou², Bowen Yuan³, Chenhui Luan¹, Ding Nan^{3

4}, Gen Huang¹, Deping Xu¹, Zheng-Hong Huang²

Affiliations

¹ School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China.
² Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, 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 College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.

Abstract

Waterborne epoxy (WEP) coatings with enhanced corrosion resistance were prepared using graphene oxide (GO) that was obtained from kish graphite, and amino-functionalized graphene oxide (AGO) was modified by 2-aminomalonamide. The structural characteristics of the GO and AGO were analyzed using X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). And the anti-corrosive performance of waterborne epoxy-cased composite coatings with different addition amounts of AGO was investigated using electrochemical measurements, pull-off adhesion tests, and salt spray tests. The results indicate that AGO15/WEP with 0.15 wt.% of AGO has the best anti-corrosive performance, and the lowest frequency impedance modulus increased from 1.03 × 10⁸ to 1.63 × 10¹⁰ ohm·cm^-2 compared to that of WEP. Furthermore, AGO15/WEP also demonstrates the minimal corrosion products or bubbles in the salt spray test for 200 h, affirming its exceptional long-term corrosion protection capability.

Keywords: 2-aminomalonamide; anti-corrosion; kish graphite; modified graphene oxide; waterborne epoxy coatings.

Grants and funding

The authors acknowledge the financial support of the Inner Mongolia Autonomous Region Major Science and Technology Project (Grant No. 2020SZD0024).