A comprehensive study of ondansetron hydrochloride drug as a green corrosion inhibitor for mild steel in 1M HCl medium

AbstractThe inhibiting action against the corrosion of mild steel by ondansetron hydrochloride (ODSH) drug was studied, using various studies such as weight loss, electrochemical impedance spectroscopy, potentiodynamic polarization measurement, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM), FT-IR spectroscopy and reactivity of molecule is studied using quantum chemical calculation. The result shows that ondansetron hydrochloride (ODSH) gives better inhibition on mild steel. The value of activation energy (Ea) and various thermodynamic parameters such as adsorption equilibrium constant (Kads), free energy of adsorption (ΔG0ads), adsorption enthalpy (ΔHads) and adsorption entropy (ΔSads) was calculated and discussed. The adsorption of ODSH on mild steel surface obeys the Langmuir adsorption isotherm. Potentiodynamic polarization measurement reveals that ODSH acts as a mixed-type inhibitor. Electrochemical impedance spectroscopy (EIS) spectra exhibit one capacitive loop indicating that, the corrosion reaction is controlled by charge transfer process. SEM, EDX, AFM, FT-IR conforms to the protective film formation. Quantum chemical calculation was calculated and discussed, and it supports the results

Design of Barrage Style Tidal Water Power Plant Structure to Reduce Sediment Accretions in Approach Channel, Entrance, Harbour and Backwaters of Cannanore Port, Kerala

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Hysterosalpingographic findings in infertile women diagnosed with genital tuberculosis

Background: Objectives of the study were to describe the hysterosalpingographic (HSG) findings among infertile women with genital tuberculosis (GTB).Methods: This is a retrospective analytical study conducted at Sri Muthu Kumaran Medical College Hospital and Research Institute, Chennai, from January 2016 to January 2020. Study population included 51 infertile women with genital tuberculosis. GTB was diagnosed by either culture/histopathological examination (HPE) or polymerase chain reaction (PCR) studies. In these proved cases of tuberculosis, HSG findings were analysed. Permission from the institutional review board was obtained for the retrospective analysis of the hospital data.Results: Among 113 women who underwent hysterosalpingography, 51 were diagnosed with GTB. In these 51 women, the HSG finding were normal in 23.5% and were abnormal in 76.5% of cases. The abnormal HSG findings noted in association with GTB were calcification (3.9%) , distorted uterine cavity (3.9%), beaded tubes, intravasation with blocked tubes (5.9%), fimbrial block with hydrosalpinx (15.6%), cornual block (35.3%) and mid tubal block.Conclusions: Though imaging findings may be highly suggestive of tuberculosis, some of the features such as tubal block and hydrosalpinx are not specific for tuberculosis and may be seen in other infective causes of tubal damage also. Therefore, specific investigations for tuberculosis are still required to make a de­finite diagnosis. The presence of HSG features indicate that considerable tubal damage has occurred

Studies on the inhibition of mild steel corrosion in hydrochloric acid solution by atenolol drug

The inhibition performance of atenolol on mild steel in 1 M hydrochloric acid solution was studied by weight loss and electrochemical methods. The results show the inhibition efficiency was found to increase with increasing the concentration of the inhibitor from 50 to 300 ppm. The maximum inhibition efficiency 93.8% was observed in the presence of 300 ppm inhibitor (in case of potentiodynamic polarization). The inhibition action of atenolol was explained in terms of adsorption on the mild steel surface. The adsorption process follows Langmuir isotherm via physical adsorption. Electrochemical Impedance spectroscopic technique (EIS) exhibits one capacitive loop indicating that, the corrosion reaction is controlled by charge transfer process. Polarization measurements showed that the inhibitor is of a mixed type. The results obtained from the different methods are in good agreement. The surface morphologies of mild steel were examined by Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscope (SEM). Further, the computational calculations are performed to find a relation between their electronic and structural properties

Surface protection of mild steel in acidic chloride solution by 5-Nitro-8-Hydroxy Quinoline

The effect of commercially available quinoline nucleus based pharmaceutically active compound 5-Nitro-8-Hydroxy Quinoline (NHQ) against the corrosion of mild steel (MS) in 1 M acidic chloride (HCl) solution was investigated by chemical (weight loss – WL) and electrochemical (Tafel polarization, Linear polarization and Electrochemical impedance spectroscopy) techniques. From all the four methods, it is inferred that the percentage of inhibition efficiency increases with increasing the inhibitor concentration from 50 to 300 ppm. The adsorption behavior of inhibitor obeyed through Langmuir isotherm model. Thermodynamic parameters were also calculated and predict that the process of inhibition is a spontaneous reaction. EIS technique exhibits one capacitive loop indicating that, the corrosion reaction is controlled by charge transfer process. Tafel polarization studies revealed that the investigated inhibitor is mixed type and the mode of adsorption is physical in nature. The surface morphologies were examined by FT-IR, SEM and EDX techniques. Theoretical quantum chemical calculations were performed to confirm the ability of NHQ to adsorb onto mild steel surface. Keywords: Acidic chloride solution, MS, NHQ, WL, SEM, FT-I

Investigations of the inhibition of copper corrosion in nitric acid solutions

The influence of levetiracetam (LV) on the inhibition of copper corrosion in 0.5 M HNO3 solutions was studied using electrochemical techniques (potentiodynamic polarization and electrochemical impedance spectroscopy), weight loss as well as thermodynamic calculations to explore the adsorption mechanism of LV. The inhibition efficiency (IE%) was found to increase with increasing the concentration of the inhibitor and with decreasing the temperature. The maximum inhibition efficiency of 94.99% was observed in the presence of 300 ppm LV. The inhibition action of the compound LV was explained in terms of adsorption on the copper surface. The adsorption process follows Langmuir isotherm. Kinetic as well as thermodynamic parameters (activation energy, enthalpy of activation, entropy of activation and free energy of adsorption) were calculated and discussed. Electrochemical impedance spectroscopic technique (EIS) exhibit one capacitive loop indicating that, the corrosion reaction is controlled by the charge transfer process. Polarization measurements showed that the inhibitor is of mixed type. DFT calculations of LV were also studied to determine interactions with the copper surface. Further, the surface analysis via scanning electron microscope (SEM) and atomic force microscope (AFM) shows a significant improvement on the surface morphology of the copper plate. Results obtained from the different methods are in good agreement. The investigation revealed the possible application of LV drug as an environmentally friendly inhibitor for corrosion prevention under specific conditions

Thallium(III) salts in heterocyclic synthesis: Synthesis of 3-aryl-9-methyl-1, 2, 4-triazolo[4, 3-<i>a</i>]quinolines

262-265Oxidation of arenecarbaldehyde 4-methylquinolin-2-yl hydrazones 2a-h with thallium(III) acetate in ace tic acid, thallium(III) acetate and thallium(III) nitrate in acetonitrile or methanol in the presence of perchloric acid, p-toluene sulphonic acid etc. afford 3-aryl-9-me thyl-1, 2,4-triazolo[4,3-a]quinolines 3a-h by intramolecular oxidative cyclization in high yield. The probable mechanism for this transformation is also proposed