Graphene oxide—Polymethyl methacrylate coatings for Corrosion protection of aerospace aluminium alloy 7075—T651 surfaces

Abstract

We report a corrosion study on Al 7075—T651 surface. The purpose of the study is to use Graphene oxide—Polymethyl methacrylate (GO—PMMA) coating as corrosion resistant layer on Al 7075—T651, an alloy of aluminium mainly used in aerospace industries. The study is done with and without GO—PMMA coating on Al 7075—T651 respectively, by varying the exposure time of material (24, 48 and 72 h) with HCl in atmospheric condition. The formation of corrosion is resisted by the GO—PMMA coated samples. The effect is studied by material characterization and non-destructive evaluation (NDE) techniques. The formation of aluminium hydroxide in uncoated samples is confirmed by Raman spectroscopy and x-ray diffraction (XRD). Corrosion formation, GO—PMMA coating on plain and coated samples are clearly visible in Scanning Electron Microscope (SEM) study. Shift in current is observed in I–V Characteristics study, due to pitting in plain samples. Material loss is observed, to be low in GO—PMMA coated samples, using pulsed thermography. The work proves that the GO—PMMA coating is very effective in corrosion resistance.

Polymerization and Applications of Poly(methyl methacrylate)–Graphene Oxide Nanocomposites: A Review

“…Graphene coatings protect substrates by blocking aggressive ions from contacting the surface with the aid of a physical barrier provided by graphene . This is due to the existence of the passivation layer and the dense filler–matrix interface, making the coating of PMMA with GO capable of preventing corrosion . Here, we discuss one of the promising previous studies of PMMA-GO for anticorrosive coating applications, as shown in Table .…”

“… 102 This is due to the existence of the passivation layer and the dense filler–matrix interface, making the coating of PMMA with GO capable of preventing corrosion. 103 Here, we discuss one of the promising previous studies of PMMA-GO for anticorrosive coating applications, as shown in Table 7 .…”

From Protosolar Space to Space Exploration: The Role of Graphene in Space Technology and Economy

“…This effect is especially evident in aluminium alloys, and the coating by anticorrosion layers is therefore a pivotal subject of applied research. In this context, GO-based materials inserted in a polymeric matrix were demonstrated to improve the corrosion resistance of the applied layers ( Figure 4 ), likely due to the more compact coating-substrate interface [ 36 ].…”

“… Schematic representation of corrosion behaviour on Al samples; ( a ) corrosion behaviour on the uncoated sample, ( b ) corrosion behaviour on GO–PMMA coated sample (reproduced with permission from ref. [ 36 ]. Copyright© 2020 IOP).…”