Creation of leather black dye film on copper through spin coating and drop casting, and comparative investigation of their corrosion behaviour in sodium chloride solutions

Abstract

To protect Cu from corrosion, one of the efficient approaches is to coat the Cu substrate with passivation materials. This work investigates the ability of leather black dye (LBD) to prevent Cu loss in 0.5 M sodium chloride. The LBD structure is investigated by Fourier transformed infrared spectroscopy (FTIRS) and UV–Vis spectroscopy (UVS). The LBD-coated Cu substrates are examined by contact angle measurements (CM), optical microscopy (OM), field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX), before corrosion. The OM and FESEM images as well as EDX spectra have shown that LBD is effectively transferred over Cu surface. The CM results have shown that LBD-coated Cu substrates are more hydrophobic than pristine Cu. The corrosion of LBD-coated Cu substrates have been monitored by open circuit potential (OCP), Tafel polarization curves (TPC), electrochemical impedance spectroscopy (EIS), OM, FESEM and EDX. According to EIS and TPC, LBD-coated Cu does better performance than pristine Cu in 0.5 M sodium chloride solution. The OM, FESEM and EDX results have declared that the LBD coating has been fashioned successfully on Cu substrate and is shielding in nature. Based on the outcomes, LBD can be proposed for Cu prevention in saline solutions. Graphical abstract: [Figure not available: see fulltext.]. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.