Abstract
Epoxy resin (EP) serves as a prevalent material for anti-corrosion coatings, yet its corrosion resistance demands further refinement. In this work, monolayer amino-modified graphene oxide with an average height of 0.930 nm and 1.023 nm was synthesized using urea and melamine, named NGO and MGO, respectively. When incorporated into EP coatings, the NGO and MGO exhibit outstanding protective properties. The impact of different concentrations of NGO and MGO on the corrosion resistance of EP coated Q235 samples were meticulously examined. Through electrochemical measurements and salt spray tests, it was determined that the coatings containing 0.1 wt% NGO or 0.3 wt% MGO exhibited remarkable corrosion resistance. Furthermore, we conducted a comparative analysis of the corrosion resistance between the NGO and MGO composite EP coatings. Following immersion in a 3.5 wt% NaCl solution for 240 h, the impedance modulus at low frequencies (|Z|0.01 Hz) of the MGO composite coating was approximately two orders of magnitude greater than that of the NGO composite coating. Even following an extended immersion period of 480 h, the |Z|0.01 Hz for MGO-EP continued to maintain an advantage of one order of magnitude.
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