Synthesized of Novel Imidazole-derived Schiff Base as a Corrosion Inhibitor of Carbon Steel in Acidic Medium Supported by Electrochemical and DFT Studies

Theeffect of 6-[5-(4-methoxyphenyl) furan-2-yl] nicotinonitrile (MA-1160) as a new corrosion inhibitor for carbon steel (CS) in hydrochloric acid (HCl) solution was investigated using weight loss (WL), atomic absorption spectroscopy (AAS) and electrochemical measurements. The surface morphology of CS was tested using: scanning electron microscopy, atomic force microscope, attenuated total reflection–Fourier transform infra-red and ultraviolet–visible spectroscopy methods. The adsorption of MA-1160 on CS surface obeyed the model of Langmuir isotherm. Polarization data revealed that this inhibitor behave as mixed-type inhibitor. The spectroscopic measurements revealed the formation of a protective adsorbed layer on CS surface. Quantum chemical calculations were calculated and discussed using density functional theory method. The inhibition efficiency (% €) was 84% in WL, 86.4% in AAS, 86.0% in potentiodynamic polarization and 84.8% in EIS 86% at 21 µM. Thus, all the test methods gave good agreement with each other in % €.

Alizarin yellow GG (AYGG) is a natural dye used as a corrosion inhibitor. The inhibitive action of this compound against corrosion of carbon steel in hydrochloric acid solution (1M concentration), has been tested using the weight loss measurements and electrochemical measurements techniques. The results indicates this compound is a good inhibitor for carbon steel in hydrochloric acid solution, and the inhibition efficiency increased as the concentration of this compound increased. Also the results revealed as the temperature increased, efficiency and corrosion activation energies are increased. On the basis of the experimentally determined activation energy values, the addition of this compound can be considered chemisorption adsorbed.

Sunflower-head extract as a sustainable and eco-friendly corrosion inhibitor for carbon steel in hydrochloric acid and sulfuric acid solutions

In this paper, aqueous extracts of mango and orange peels were shown to be good corrosion inhibitors for carbon steel in a 1 mol L - 1 HCl solution. The inhibition efficiency increased as the extract concentration increased over a concentration range of 200-600 mg L - 1, varying from 79 to 96% (mango) and 84 to 91% (orange) using Tafel plots and from 69 to 94% (mango) and 76 to 90% (orange) using electrochemical impedance. In the presence of 400 mg L - 1 of mango and orange peel extracts, the weight loss measurements showed an increase in the inhibition efficiency with immersion time, where the best results after 24 h of immersion were 97% and 95%, respectively. The adsorption of the extract components on the surface of the carbon steel follows the Langmuir adsorption isotherm. With the extraction procedure used in this work, it can be surmised that it is likely that the more polar heterosides in the extracts are responsible for the corrosion inhibition of carbon steel in an acid solution.

Synergistic adsorption mechanism of pulsatilla chinensis root extract as an eco-friendly corrosion inhibitor for carbon steel in acidic solution.

Insight into the anti-corrosion performance of Acanthopanax senticosus leaf extract as eco-friendly corrosion inhibitor for carbon steel in acidic medium

Inhibition of carbon steel corrosion in 0.5 M hydrochloric acid solutions by β-cyclodextrin modified natural chitosan was investigated by weight loss measurement, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results indicated that the inhibition efficiency increased with the inhibitor concentration at 298 K. The experimental results revealed that β-CD–chitosan (β-cyclodextrin modified chitosan) was a mixed inhibitor with a maximum achievable inhibition efficiency of 96.02%. Adsorption of β-CD–chitosan was found to follow the Langmuir adsorption isotherm which involved both physisorption and chemisorption. The results of SEM and EDS studies further confirmed the inhibition action of polymer.

Two new benzodiazepine derivatives namely, 1-ethyl-4-(2-oxopropylidene)-1,2,4,5-tetrahydro-2H-1,5-benzodiazepine-2-one (BZD-1) and 1-octyl-4-(2-oxopropylidene)-1,2,4,5-tetrahydro-2H-1,5-benzodiazepine-2-one (BZD-2) have been synthesized and used as corrosion inhibitors for carbon steel in acidic solution (1 M HCl). Corrosion inhibition evaluation was performed using weight loss, electrochemical techniques [potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS)], quantum chemical calculations, and molecular dynamic (MD) simulations. The results showed that both compounds are good corrosion inhibitors for carbon steel in 1 M HCl medium; their inhibition efficiency increased with inhibitor concentration. In addition, the results obtained from above methods reveal that BDZ-2 is an excellent inhibitor. It gives a maximum inhibition efficiency of 96.63% at 10−3 M and inhibits corrosion by adsorbing at the carbon steel surface. EIS measurements showed that the charge transfer resistance increases, whereas the double-layer capacitance decreases with the inhibitor concentration. Polarization studies showed that BDZ-1 and BDZ-2 are mixed type. The tested inhibitors have been adsorbed on the carbon steel surface according to Langmuir isotherm adsorption model. The experimental results are in reasonably close agreement with quantum chemical parameters calculated at DFT/B3LYB/3-21G and the molecular dynamic simulations results.

Insight into interfacial adsorption and inhibition mechanism of Aconitum carmichaelii Debx extract as high-efficient corrosion inhibitor for carbon steel in acidic solution

Corrosion inhibition of carbon steel by three kinds of expired cephalosporins in 0.1 M H2SO4

Rollinia occidentalis extract as green corrosion inhibitor for carbon steel in HCl solution

The influence of branched N, N′-bis(p-hydroxybenzoyl) containing propylenediamine (PDA) and triethylenetetramine (TETA) composites for corrosion inhibition of carbon steel in acidic solution (1 M HCl) was investigated using several quantum chemical, electrochemical impedance spectroscopy and potentiodynamic polarization as electrochemical techniques. The investigated molecules were posteriorly characterized by proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared spectroscopy (FTIR) while the surfaces of carbon steel test coupons were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The obtained results revealed that the two amino compounds, N, N′-bis(p-hydroxybenzoyl) propanediamine (N, N′-HBPDA) and N, N′-bis(p-hydroxybenzoyl) triethylenetetramine (N, N′-HBTETA), have significant efficiency toward steel corrosion attack and its inhibition performance was significantly boosted by increasing concentration of di- and tetramine containing inhibitors. The two inhibitors achieved a maximum corrosion inhibition efficiency of 99.1% as indicated from polarization measurements. The isotherm feature of Langmuir adsorption appeared to be proper factor for associating the experimental gains with an applicable mechanism of inhibition process. The free energy ∆Gads was calculated to be − 27.5, 29.1 kJ/mol based on the adsorption isotherm model, indicating physical adsorption on the carbon steel surface. Further, images of the morphological analysis exhibited various features of attack owing to the aggressive medium and the employed concentration of the inhibitor. These synthesized amines supplied many favorable scores in the fabrication of functional mixed-type inhibitors. The computational studies reveal that N, N′-HBPDA and N, N′-HBTETA molecules could absorb via several lone pairs and π clouds, confirming their ability to be good corrosion inhibitors.

Corrosion is an unavoidable fact in everyday life but always receive attention to control due to its technical, economical, and esthetical importance. Carbon steel (CS) is the most commonly used material for equipment and pipes in the oil production processes. However, presence of water/salts and carbon dioxide, among other gases, in the oil is a serious problem due to increased corrosion rate of the material. The most common way of mitigating this problem is by using corrosion inhibitors. However, many common corrosion inhibitors that are in use today are health hazards. Corrosion inhibitors are one of the most widely used and economically viable methods protecting metals and alloys against corrosion. In this work the inhibitory effect of wood ash (olive and palm) on mild carbon steel was studied in a solution of 0.00001 M or pH around 5 of hydrochloric acid.The corrosion rate and inhibitor efficiency were calculated by conducting the inhibition efficiency test for 10% aqueous wood ash solutions for both (olive and palm) using (weight loss method).The effect of temperature on the corrosion behavior of mild carbon steel was studied at 0.00001 M and pH = 5 hydrochloride with the addition of 10% aqueous wood ash solutions (olive and palm) in the temperature range 25-50 degrees Celsius.An inhibition efficiency of up to 54.16 % for Palm Ash Solution and 48.18 % for Olive Ash Solution can be obtained. The interaction between the corrosion rate of mild steel and the inhibitor is affected by temperature and the protection mechanism of wood ash solution is more efficient at higher temperatures. This is due to corrosion of the metal or damage that occurs on its surface due to high temperatures. It occurs at non-adsorbed sites of inhibitory elements. As for the adsorbed sites, the interaction between the active substance of the inhibitor and the surface occurs gradually with increasing temperatures, which leads to an increase in the efficiency of the inhibitor.

Insight into the corrosion inhibition performance of dimethyldiallylammonium chloride acrylamide copolymer for mild steel in acidic solution

PurposeThis paper mainly aims to study the influence of some thiosemicarbazides, namely, 1‐hydroxyphenyl‐4‐phenyl thiosemicarbazide (HPT), 1,4‐diphenyl thiosemicarbazide (DPT), 1‐aminophenyl‐4‐phenyl thiosemicarbazide (APT) and 1‐cinnamyl‐4‐phenyl thiosemicarbazide (CPT) on the corrosion inhibition of carbon steel in hydrochloric and sulphuric acid.Design/methodology/approachAll inhibition experiments were conducted on carbon steel in 1N HCl and 1N H2SO4 solution. Weight loss experiments were carried out according to the ASTM standard procedure. Polarization studies were carried out in a three‐electrode cell assembly connected to an EG&G Princeton applied research potentiostat/galvanostat (model 173).FindingsFor all the compounds a consistent trend of increase in inhibition efficiency was observed as a function of inhibitor concentration. The adsorption of all the compounds on to the carbon steel surface in the acidic solution was found to obey the Tempkin's adsorption isotherm. The values of activation energy and free energy of adsorption for all the compounds were also calculated. Polarization measurement revealed that the studied thiosemicarbazides act predominantly as mixed inhibitors in both the acid solutions, with the exception of DPT, which predominantly behaved as a cathodic inhibitor in 1N HCl.Research limitations/implicationsThese inhibitors could have application in industries, where hydrochloric and sulphuric acid solution are used to remove scale and salts from steel surfaces, such as acid cleaning of tankage and pipeline, and may render dismantling unnecessary.Originality/valueThis paper reveals that thiosemicarbazides can be successfully used for protection of carbon steel corrosion in acid solutions.