A Novel Hydrazinecarbothioamide as a Potential Corrosion Inhibitor for Mild Steel in HCl

Abstract

2-(1-methyl-4-((E)-(2-methylbenzylidene)amino)-2-phenyl-1H-pyrazol-3(2H)-ylidene)-hydrazineecarbothioamide (HCB) was synthesized as a corrosion inhibitor from the reaction of 4-aminoantipyrine, thiosemicarbazide and 2-methylbenzaldehyde. The corrosion inhibitory effects of HCB on mild steel in 1.0 M HCl were investigated using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The results showed that HCB inhibited mild steel corrosion in acidic solution and inhibition efficiency increased with an increase in the concentration of the inhibitor. The inhibition efficiency was up to 96.5% at 5.0 mM. Changes in the impedance parameters suggested that HCB adsorbed on the surface of mild steel, leading to the formation of a protective film. The novel corrosion inhibitor synthesized in the present study was characterized using Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectral data.

New Corrosion Inhibitor Derived from Coumarin

“…Structure modification of coumarin moiety exhibit inhibition of unit enzyme both in vitro and in vivo [16][17][18][19][20]. Corrosion inhibitors increase the impedance of mild steel toward corrosive solutions and inhibit or retard the corrosion through adsorbing the molecules of inhibitor on the surface of mild steel [21][22][23][24][25][26][27] in order to generate a barrier on the surface that block dynamic sites for mild steel [28][29][30]. Natural or synthesized organic corrosion inhibitors may have adsorbed on metal surface.…”

Photostabilizing Efficiency of PVC in the Presence of Schiff Bases as Photostabilizers

“…However, the working principles of this approach are not yet fully understood [15]. In the continuation of previous studies [16][17][18][19][20][21][22][23], we focused on the photostabilization of PVC using 1,3,4-thiadiazole compounds. To our knowledge, there has been no attempt to investigate the photostabilization of PVC films by Schiff bases containing four 1,3,4-thiadiazole rings; therefore, in this study, we report the design of the Schiff bases and the study of their use as a photostabilizing reagents.…”

Synthesis, Characterization, and Study the Inhibitory Effect of Thiazole and Thiadiazole Derivatives Toward the Corrosion of Copper in Acidic Media

“…The planarity and pairs of free electrons in heteroatoms are an important reason that makes the adsorption of these derivatives on the metal surface good, also these heterocyclic derivatives are considered as noncytotoxic substances. [15] This environmentally friendly property makes them used as inhibitors to replacing some toxic organic inhibitors that are used in the same fields. [16] This work was designed to study (a) corrosion inhibition of copper in nitric acid solution by some thiazole and thiadiazole derivatives using weight loss method, (b) the effect of the substituent groups in thiazole derivatives on the inhibition efficiency, (c) the difference in inhibition ability between thiazole and thiadiazole derivatives, and also (d) the effect of temperature on the corrosion rate.…”