Impact of graphene nanosheets on adhesion and corrosion performance of reinforced polyurethane coating for aerospace aluminium alloy 2024-T3

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作者：
Najm Obaid, Ahmed [1 ,2 ]
Al-Bermany, Ehssan [1 ]
机构：
[1] Department of Physics, College of Education for Pure Sciences, University of Babylon, Babylon, Iraq
[2] Iraqi Airways, Baghdad International Airport, Ministry of Transport, Baghdad, Iraq
来源：
International Journal of Adhesion and Adhesives | 1600年 / 132卷
关键词：
This investigation aims to create an integrated multilayer coating system for the surface of aerospace aluminium alloy 2024-T3. A solution-sonication mixing approach was applied to fabricate low-cost and high-efficiency layers. The coating system consisted of three main layers: pretreatment; green epoxy primer (GEP); and polyurethane (PU) top coating layer. To create the pretreatment layer; 50% graphene oxide (GOLMdis) was functionalized using a 50% 3-aminopropyltriethoxy silane coupling agent (SCA). The PU top coating layer was grafted with 1–3% wt. of GOLMdis to improve its resistance to environmental influences. Various analytical techniques such as Fourier-transform infrared spectroscopy (FTIR); X-ray diffraction (XRD); Field emission scanning electron microscopy (FESEM); and Thermogravimetric analysis (TGA) were used to evaluate the properties of the PU-GO layer. The results confirmed the graft of GOLMdis onto the surface of PU; proving the existence of an interaction between the nanosheets and the polymer. The corrosion resistance performance of the multilayer coating systems was evaluated using electrochemical and adhesion tests. The 50%GO-SCA/Epoxy/2%GO-PU coating system outperforms other coating systems. It exhibited a significant improvement in the real impendence (Zre) by up to 9068 % compared to other coating systems. Moreover; only 5% of the coating was removed during the adhesion analysis. The results confirm the successful incorporation of anti-corrosion graphene oxide fillers into the multilayer coating system for corrosion protection of aerospace alloy 2024-T3. © 2024 Elsevier Ltd;
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