Experimental and Theoretical Studies of Tailor-made Schiff Bases as Corrosion Inhibitors for Carbon Steel in HCl

Strong acids used in industrial applications as cleaning, descaling, among others, can severely damage metallic structures, requiring corrosion inhibitors to diminish or avoid these issues. Since many conventional compounds for this purpose may result environmental and human health issues, eco-friendly such Schiff bases have been recently investigated. The synthesis of three novel (SBs) was confirmed by infrared spectroscopy (FTIR) hydrogen nuclear magnetic resonance (1H-NMR). Weight loss measurements were carried out 1 M HCl over 303K-333K. Furthermore, the combination with a surfactant improved efficiencies, reaching an efficiency 93%. Optical scanning electron microscopies reduced roughness pit depths carbon steel samples. Density-functional theory calculations neutral forms SBs revealed that geometrical energetical parameters are similar studied SBs. results exhibited more planar structures protonated species, improving chemical physical interactions between aromatic rings atoms.