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

## TL;DR

Amino-modified graphene oxide improves the corrosion resistance of waterborne epoxy coatings, making them more durable for long-term use.

## Contribution

A novel amino-functionalized graphene oxide derived from kish graphite is developed to enhance waterborne epoxy coatings' anti-corrosive properties.

## Key findings

- Amino-functionalized graphene oxide (AGO) significantly improves the corrosion resistance of waterborne epoxy coatings.
- The AGO15/WEP coating with 0.15 wt.% AGO showed the lowest frequency impedance modulus of 1.63 × 10¹⁰ ohm·cm⁻².
- Salt spray tests confirmed minimal corrosion products in AGO15/WEP after 200 hours, indicating long-term protection.

## 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.