Copper In Nitric Acid Solution Research Articles

Recycling Unused Midazolam Drug as Efficient Corrosion Inhibitor for Copper in Nitric Acid Solution.

The current work explores the potential for recycling unused or expired Midazolam (MID) drug, a benzodiazepine derivative, as an efficient corrosion inhibitor for copper in nitric acid solution. The technical advantage of recycling expired MID drug relates to the avoidance of organic inhibitor production costs and the reduction of disposal costs of the expired medication. A combination of electrochemical methods (potentiodynamic polarization and electrochemical impedance spectroscopy), weight loss, and quantum chemical calculation were used to assess the inhibition mechanism and efficiency of MID. It was found that inhibition efficiency increases with inhibitor concentration, reaching a highest value of 92.9% for a concentration of 10−4 M MID. MID was classified as a mixed-type inhibitor, showing a preferential cathodic suppression mechanism. The obtained values of −45.89 kJ mol−1 for the standard free energy of adsorption indicate that the inhibition mechanism is based on chemisorption of MID molecules on the copper surface, which obeys the Langmuir isotherm. Surface analysis using scanning electronic microscopy revealed that MID offers high protection against corrosion during both immersion and polarization tests. Molecular modelling and quantum chemical calculations indicated chemical interactions between MID molecules and the copper surface, as well as electrostatic interactions. The results obtained using the different techniques were in good agreement and highlight the effectiveness of MID in the corrosion inhibition of copper.

Theoretical Evaluation of Some Compounds with Antifungal Effect as Corrosion Inhibitors for Copper in Nitric Acid Solution: DFT Calculations

Quantum chemical calculations based on Density Functional Theory (DFT) at the B3LYP/6-31G (d,p) basis set were used to study the inhibition performance of four antifungal organic molecules in copper corrosion in 1M nitric acid solution. The quantum chemical descriptors analysis shows that the investigated compounds have good inhibitory abilities in combating copper corrosion. It results that the inhibition efficiency of these molecules is a function of highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO) and the energy gap. The inhibition performance of these molecules increases when the energy gap decreases. Finally, the areas containing N, S and C atoms are the most likely sites to bind to the copper surface either by donating or receiving electrons.

Corrosion Inhibition Effect of Methanol Extract of Nerium Oleander on Copper in Nitric Acid Solutions

Corrosion Inhibition Effect of Methanol Extract of Nerium Oleander on Copper in Nitric Acid Solutions

Investigation of Withania Somnifera Extract as Corrosion Inhibitor for Copper in Nitric Acid Solutions

Investigation of Withania Somnifera Extract as Corrosion Inhibitor for Copper in Nitric Acid Solutions

New azonitrile derivatives as corrosion inhibitors for copper in nitric acid solution

AbstractThe inhibitive effect of new synthesized azonitriles, namely 3-phenyl azo-2-amino-1,1,3-tricyano propene, 3-p-tolyl azo-2-amino-1,1,3-tricyano propene, 3-p-anisyl azo-2-amino-1,1,3-tricyano propene, 3-p-nitro phenyl azo-2 amino-1,1,3-tricyano propene, and 3-p-phenyl carboxylic azo-2-amino-1,1,3-tricyano propene on the corrosion of copper in nitric acid solution was investigated using chemical and electrochemical methods. The inhibition efficiency was found to increase with inhibitor concentration and decreased with rise in solution temperature. Various thermodynamic parameters were calculated and discussed in order to elaborate the mechanism of corrosion inhibition. Polarization measurements revealed that the studied azonitriles acted as mixed inhibitors. The results revealed that these compounds were adsorbed onto the copper surface and the adsorption obeyed the Temkin adsorption isotherm. The quantum chemical calculations were in good agreement with the experimental results.

Experimental and theoretical studies of anti-ulcer drugs with benzimidazole rings as corrosion inhibitor for copper in 1 M nitric acid medium

The adsorption effect of esomeprazole (ESP) and lansoprazole (LP) on corrosion behavior of copper in 1 M HNO3 solution was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurements. The experimental results indicate that both ESP and LP inhibited the corrosion of copper in nitric acid solution and the inhibition efficiency increased as the concentration of the compounds increased. EIS measurements confirmed that the charge transfer resistance increases on increasing the inhibitor concentration. Polarization measurements showed that the inhibitors are of mixed type. From the weight loss measurements, the inhibition efficiency of the inhibitors was found to vary with concentration, immersion time, and temperature. The adsorption of inhibitors on the copper surface follows Langmuir isotherm. The surface morphology was examined by scanning electron microscope and atomic force microscope. Further, the computational calculations are performed to find a relation between their electronic and structural properties.

Experimental and computational studies on the inhibition performances of benzimidazole and its derivatives for the corrosion of copper in nitric acid

The inhibitive performance of seven synthesized 2-(2-benzimidazolyl)-4 (phenylazo) phenol (BPP_1–7) derivatives was investigated experimentally on the corrosion of copper in 2.0 M HNO3 acid using mass loss, thermometric and DC potentiodynamic polarization techniques. Quantum chemical calculations was investigated to correlate the electronic structure parameters of the investigated benzimidazole derivatives with their inhibition efficiencies (IE%) values. Global reactivity parameters such as E HOMO, E LUMO, the energy gap between E LUMO and E HOMO (ΔE), chemical hardness, softness, electronegativity, proton affinity, electrophilicity and nucleophilicity have been calculated and discussed. Molecular dynamics simulation was applied on the compounds, to optimize the equilibrium configurations of the molecules on the copper surface. The areas containing N atoms are most possible sites for bonding Cu (111) surface by donating electrons. Binding constant (K b), active sites (1/y), lateral interaction (f), equilibrium constant (K ads) and standard free energy of adsorption (∆G°) values obtained from either kinetic model and/or Frumkin adsorption isotherm were compared and discussed. Thermodynamic functions and activation parameters such as: E a, ΔH*, ΔS* and ΔG* at temperatures 303, 313, 323 and 333 K were determined and explained. IE% values of the examined compounds on Cu (111) surface followed the order arrangement: BPP_1 > BPP_2 > BPP_3 > BPP_4 > BPP_5 > BPP_6 > BPP_7. The theoretical data obtained as compatible with experimental results showed that the studied benzimidazole derivatives (BPP_1–7) are effective inhibitors for the corrosion of copper in nitric acid solution.

Corrosion inhibition of Copper in Nitric acid solutions by organic compound

Corrosion inhibition of Copper in Nitric acid solutions by organic compound

Studies on the Corrosion Inhibition of Copper in Nitric Acid Solution Using Some Pharmaceutical Compounds

Studies on the Corrosion Inhibition of Copper in Nitric Acid Solution Using Some Pharmaceutical Compounds

Inhibition of corrosion of copper in nitric acid solution by four amino acids

Inhibition of corrosion of copper in 1M HNO3 solution by four amino acids, proline (Pro), phenylalanine (Phe), tyrosine (Tyr), and tryptophan (Try), has been studied by use of gravimetric and electrochemical polarization measurements. The results obtained the from two different techniques are comparable, and show that Tyr and Try act as good inhibitors of corrosion of copper in 1 mol L−1 HNO3. Correlation between inhibition efficiency and quantum chemical calculations, performed using semi empirical (AM1 and MNDO) and ab-initio methods, is discussed.

Corrosion Inhibition of Copper in Nitric Acid Solution Using Some Secondary Amines

Copper corrosion inhibition in 0.1 M nitric acid (HNO3) solution by some secondary amines, namely, dibutyl amine (C8H20N), diethyl amine (C4H11N), and diphenyl amine (C12H11N), was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM) techniques. A significant decrease in the corrosion rate of copper was observed in the presence of the investigated compounds. The corrosion rate was found to depend on the concentration, temperature, and type of inhibitor. The adsorption of these compounds was found to follow the Temkin adsorption isotherm. Tafel polarization data indicated that the investigated amines were inhibiting both cathodic and anodic reactions. The thermodynamic activation parameters of copper dissolution in 0.1 M HNO3 were determined and discussed. The results obtained from the three different techniques were in good agreement. Clear correlation was found between corrosion inhibition efficiency and theoretical ...

Corrosion Inhibition Performance of 3,5-Diamino-1,2,4-triazole for Protection of Copper in Nitric Acid Solution

Corrosion Inhibition Performance of 3,5-Diamino-1,2,4-triazole for Protection of Copper in Nitric Acid Solution

Corrosion Inhibition of Copper in Nitric Acid Solutions Using a New Triazole Derivative

Corrosion Inhibition of Copper in Nitric Acid Solutions Using a New Triazole Derivative

Ethoxylated Fatty Esters as Corrosion Inhibitors for Copper in Nitric Acid Solutions

The effect of five compounds of ethoxylated fatty esters with different number of ethylene oxide units on the corrosion of copper in 1 M HNO 3 solution has been studied using weight loss and galvanostatic polarization techniques. The inhibition efficiency was found to increase with increasing concentration and number of ethylene oxide units per molecule. Inhibition effect was explained on the basis of adsorption of ethoxylated fatty esters on the metal surface through their ethoxy groups. The adsorption process was found to follow Temkin adsorption isotherm. Polarization data suggested that the used additives act as mixed type inhibitors. It was found also that the ethoxylated fatty esters provide a good protection to copper against pitting corrosion in chloride containing solutions.

Corrosion control of copper in nitric acid solutions using some amino acids – A combined experimental and theoretical study

Inhibition performance of three amino acids, namely l-methionine (MIT), l-methionine sulfoxide (MITO) and l-methionine sulfone (MITO2), as corrosion-safe inhibitors for copper surface in 1.0 M nitric acid was investigated by weight loss, dc polarization and ac impedance techniques. A significant decrease in the corrosion rate of copper was observed in the presence of the investigated compounds. The reactivates of the compounds under investigation were analyzed through Fukui functions, to explain their inhibition performance. Simulation techniques incorporating molecular mechanics and molecular dynamics were used to simulate the adsorption of l-methionine derivatives, on copper (1 1 1) surface in nitric acid.

Some amino acids as corrosion inhibitors for copper in nitric acid solution

The inhibition effect of five amino acids (AA) on the corrosion of copper in molar nitric solution was studied by using weight loss and electrochemical polarization measurements. Valine (Val) and Glycine (Gly) accelerate the corrosion process; but Arginine (Arg), Lysine (Lys) and Cysteine (Cys) inhibit the corrosion phenomenon. Cysteine is the best inhibitor. Its efficiency increases with the concentration to attain 61% at 10 − 3 M. Correlation between the quantum chemical calculations and inhibition efficiency was discussed using semi-empirical methods (AM1 and MNDO).

Derivation of a semi-empirical model for copper dissolution in HNO 3 solutions with rotating disc technique

A semi-empirical model has been derived for the dissolution process of metallic copper in nitric acid solutions, using the rotating disc technique. The experimental results showed that the rate of dissolution of copper d x/d t (g copper min −1) increased with increasing rotating disc speed w (rad s −1), temperature, T (K), disc surface area A (m 2) and nitric acid concentration (mol cm −3). The activation energy, E (kJ mol −1) for the dissolution process was found to be 41.43 kJ mol −1. The semi-empirical model for the process derived from the experimental results was d x d t = 84.6 × 10 2 w 0.44 C 2.71 A e − 4983 / T

The Use of Some 4-Phenylthiocarbazone Derivatives as Corrosion Inhibitors for Copper in Nitric Acid Solutions

The Use of Some 4-Phenylthiocarbazone Derivatives as Corrosion Inhibitors for Copper in Nitric Acid Solutions

Inhibition of corrosion of copper in nitric acid solution by some arylmethylene cyanothioacetamide derivatives

The inhibition of corrosion of copper in 2M HNO 3 solution by some arylmethylene cyanothioacetamide derivatives was tested using polarization measurements. The results showed that these compounds act as mixed type inhibitors and inhibition efficiencies up to 90% can be obtained. The inhibition was assumed to occur via physical adsorption of the inhibitor molecules fitting a Frumkin isotherm. The influence of the substituent group on the inhibition efficiency of the inhibitor was explained in terms of the density of the electron cloud on the cyanothioacetamide moiety and the mode of adsorption. The increase in temperature was found to increase the corrosion in absence and in presence of inhibitors. Some thermodynamic functions were also computed and discussed.

Effect of the Molecular Structure of Cyanine Dye on the Electrochemical Corrosion Behaviour of Metallic Copper in Nitric Acid Solution

The effect of 2-(2-hydroxystyryl)quinolinium-1-ethyl iodide (I) and 4-(2-hydroxystyryl)quinolinium-1-ethyl iodide (II) cyanide dyes on the corrosion behaviour of copper metal in nitric acid solution has been studied. Weight loss measurement, galvanostatic polarization curves, open-circuit potential variation of copper electrode with time and the cathodic protective current values indicate that cyanine dye I gives better anticorrosive effect than dye II. The inhibition effect in case of the two cyanine dyes is more pronounced in case of the addition of dye to the corrosion medium than that obtained in case of copper metal coated by dye thin film (previously treated in dye solution) before immersion in corrosive medium.