4(N,N-dimethylamino) benzaldehyde nicotinic hydrazone as corrosion inhibitor for mild steel in 1 M HCl solution: An experimental and theoretical study (original) (raw)
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The title compounds N-benzyl piperidine -4- one phenyl hydrazone (BPPH) and N-benzyl piperidine -4-one hydrazone (BPH) were used to control mild steel corrosion in 2M HCl solutions at different temperatures (303K-333K). The corrosion inhibitory effect of the compounds has been investigated by weight loss study, electrochemical methods, SEM and quantum chemical studies. The weight loss studies were conducted at four different temperatures such as 303K, 313K, 323K and 333K for various concentrations of (0, 25,50, 100, 200 and 300 ppm) for 1h and 2h duration. The study showed that inhibition efficiency increases with increase of BPPH and BPH concentration and decreases with increase of temperature. It was found that inhibition was due to adsorption of BPPH and BPH on the MS surface obeying Temkin’s adsorption isotherm. Electrochemical data for corrosion processes such as corrosion potential(Ecorr), corrosion current(icorr) and Tafel slopes (ba and bc) were determined using Tafel plot, which showed that increase in concentration of BPPH and BPH decreases corrosion current and behaves as mixed mode inhibitor. AC impedance measurement as determined by Nyquist plot revealed that charge transfer resistance increases with increase of concentration, whereas double layer capacitance decreases with increase of concentration complimenting each other. SEM studies revealed the surface protecting ability of BPPH and BPH in acid medium. Quantum chemical studies illustrated that the corrosion inhibition efficiency of BPPH and BPH is due to lone pair of electrons of two nitrogen in the hydrazone moiety ? electron of phenyl ring and ring nitrogen.
Research on Chemical Intermediates, 2019
Mild steel corrosion in HCl solution is an example of corrosion in acidic mediums. The ongoing research efforts to develop novel environmentally friendly corrosion inhibitors raise questions regarding their ability to effectively protect steel from corrosion. Herein, a series of experimental studies were conducted to explain the scientific mechanism of adsorption of four hydrazone derivatives (HDZs) namely, 2-((2,3-dimethylphenyl)amino)-N′-((1E,2E)-3-phenylallylidene)benzohydrazide (HDZ 1) (E)-2-((2,3-dimethylphenyl)amino)-N′-(4-hydroxybenzylidene)benzohydrazide (HDZ 2) (E)-2-((2,3-dimethylphenyl)amino)-N′-(1-phenylethylidene)benzohydrazide (HDZ 3) and N′-cyclohexylidene-2-((2,3-dimethylphenyl)amino)benzohydrazide (HDZ 4) on mild steel (MS) in 1.0 M HCl using chemical, electrochemical and surface characterization techniques. All results show that the inhibitor molecules form a stable layer on steel surface through chemical and physical interactions. HDZs adsorption onto the steel surface was found to follow Langmuir model. Furthermore, electrochemical results demonstrated that our developed inhibitors act as mixed-type inhibitors, with HDZ 1 showing the highest polarization resistance and lowest corrosion current density. X-ray diffraction and scanning electron microscope were used to study corrosion products phases and surface morphology of MS samples. Our findings provide deeper insights into understanding the interaction mechanisms of HDZs with a steel surface and can be helpful to explore novel approaches to mitigate the steel dissolution.
2014
Corrosion behaviour of mild steel in 1 M hydrochloric acid solution containing various concentrations of (2E)-2-(3-hydroxy- 2-methoxybenzylidene) hydrazinecarbothiamide (HMBHC) was studied by Tafel polarization technique and electrochemical impedance spectroscopy technique at different temperatures. The inhibition efficiency of HMBHC increased with the increase in its concentration and in temperature. Polarization study showed that the HMBHC acted as a mixed type inhibitor and its adsorption on mild steel surface was found to follow Langmuir’s adsorption isotherm. The formation of protective film was confirmed by scanning electron microscopy study.
A Novel Hydrazinecarbothioamide as a Potential Corrosion Inhibitor for Mild Steel in HCl
Materials, 2013
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.
Indian Journal of Chemical Technology, 2016
Inhibition effect of (2 E )-2-(3-hydroxy-2-methoxybenzylidene) hydrazinecarbothioamide (HMBHC) on the corrosion of mild steel in 0.5 M HCl solution has been investigated using potentiostatic polarization and electrochemical impedance spectroscopic techniques. The inhibition efficiency increases with increase in inhibitor concentration and with increase in temperature. The polarization study show that the HMBHC acted as mixed type of inhibitor. The kinetic and thermodynamic parameters have been calculated and discussed in detail. The adsorption of inhibitor on the metal surface is found to be through chemisorption and followed Langmuir’s adsorption isotherm. The surface morphology of the specimen has been studied by scanning electron microscopy study.
The corrosion inhibition of C-steel in 1 M HCl was assessed using three newly synthesized hydrazide derivatives (H1, H2 and H3) using weight loss (WL), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques. Also, the adsorption of these compounds was confirmed using several techniques such as atomic force microscopy (AFM), Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). High inhibition efficiencies were obtained resulting from the constitution of the protective layer on the C-steel surface, which increased with increasing concentration and temperature and reached 91.7 to 96.5% as obtained from the chemical method at 20 Â 10 À6 M at 45 C. The polarization curves refer to these derivatives belonging to mixed-type inhibitors. The adsorption of (H1, H2 and H3)on the CS surface follows the Temkin adsorption isotherm. Inhibition influence of hydrazide derivatives at the molecular level was greatly proven using quantum chemical calculations and Monte Carlo simulation methods. Furthermore, the molecular simulation results evidenced the adsorption of these derivatives on the carbon steel surface.
Hydrazide derivatives as corrosion inhibitors for mild steel in 1M HCl
Progress in Organic Coatings, 2005
N-Phenyl oxalic dihydrazide (PODH) and oxalic N-phenylhydrazide N -phenylthiosemicarbazide (OPHPT), synthesized in our laboratory, were tested as inhibitors for the corrosion of mild steel in molar HCl by electrochemical measurements. Inhibition efficiencies up to 92% for OPHPT and 79% for PODH can be obtained. Polarization curves reveal that PODH and OPHPT act as mixed type inhibitors. Adsorption of these inhibitors on the mild steel surface was found to obey the Langmuir adsorption isotherm. Results show that the rate of corrosion of mild steel increased with increasing temperature over the range 25-55 • C both in the presence of inhibitors and in their absence. Activation energies in the presence and absence of PODH and OPHPT were obtained by measuring the temperature dependence of the corrosion current. The reactivity of these compounds was analyzed through theoretical calculations based on density functional theory to explain the different efficiency of these compounds as corrosion inhibitors.
The inhibition effect of the Hydralazine hydrochloride for mild steel corrosion in 1M HCl has been investigated. Polarization measurement indicates that the Hydralazine hydrochloride act as mixed-type inhibitor, which gives a maximum inhibition efficiency around 72 %. Electrochemical impedance spectroscopy was used to investigate the mechanism of corrosion inhibition gives around 76 % due to the formation of electrical double layer. Thermodynamic parameter such as ΔG0 ads value was obtained as -30.22 KJ/mol indications that inhibitor shows its inhibition effect due to the chemisorptions process. Scanning electron microscopic images gives a visual idea about the formation of the protective film on the mild steel surface to reduce the corrosion rate. So that the Hydralazine hydrochloride acts as an efficient mixed type corrosion inhibitor for mild steel corrosion in acid media.