Abstract
The corrosion resistance of a single-layer graphene film synthetized via chemical vapor deposition (CVD) on a polycrystalline copper substrate is studied. The anticorrosive properties were identified by means of electrochemical tests of potentiodynamic polarization and electrochemical impedance spectroscopy in the following environments: (a) 0.5 M H2SO4, (b) 0.5 M HCl, (c) 3.5wt% NaCl + 0.5 M H2SO4, and (d) Na2S2O3 (10−4 mol / l) + 5% NaCl + (CH3COOH) 0.50%). For the characterization of the graphene and corrosion products, the following techniques were used: Raman spectroscopy, AUGER electron spectroscopy, X-ray energy dispersion probe (EDS), scanning electron microscopy (SEM), and confocal laser scanning microscopy (CLSM). The corrosion mechanism and the degree of degradation of the graphene are discussed as a function of the corrosive electrolyte.
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