Corrosion Inhibition Of Copper Research Articles

Two common antihistamine drugs as high-efficiency corrosion inhibitors for copper in 0.5M H2SO4

Experiments and theoretical calculations to explore the potential of anti-corrosion performance corresponding dioxopromethaxine hydrochloride(DPZ) and promethazine hydrochloride(PZ) for copper in 0.5 M H2SO4 solution. The electrochemical test results and topography information indicated that corrosion inhibition ability of PZ outshines DPZ, the suppression efficiency was high to 96.98% and 93.43%, respectively. The results indicated that two corrosion inhibitor adsorption models follow the Langmuir. Combing XPS and FT-IR confirmed that the DPZ and PZ can adsorp on the copper surface. The molecular dynamics simulation(MD) calculation based on DFT theory verifies the DPZ and PZ successful adsorptionon Cu(1 1 1) surface.

Inhibition of Copper Corrosion in Acid Rain Solution Using the Imidazole Derivatives

Inhibition of Copper Corrosion in Acid Rain Solution Using the Imidazole Derivatives

Atriplex leucoclada extract: A promising eco-friendly anticorrosive agent for copper in aqueous media

Conventional organic and inorganic corrosion inhibitors are noxious and hazardous to living organisms and the environment. Therefore, the use of plant extracts as potential corrosion inhibitors for metals has attracted considerable attention because these compounds are renewable and can have low toxicity, mainly when derived from edible plant species. Here, we prepared Atriplex leucoclada extract (ALE, 0–8g/L) and tested its effectiveness as an eco-friendly copper corrosion inhibitor in 1M HCl using several characterisation techniques, such as potentiodynamic polarisation experiments at the open-circuit potential, electrochemical impedance spectroscopy, and surface morphology. Adsorption isotherm modelling based on the Langmuir monolayer adsorption model revealed that the antioxidant flavonoids and polyphenolic compounds in ALE adsorb on the surface of copper and act as mixed-type inhibitors to reduce copper corrosion. Notably, the use of ALE resulted in a high (91.5%) inhibition efficiency at room temperature. Our results demonstrate the potential of ALE as a corrosion inhibitor for copper in acidic media and enrich knowledge regarding the use of plant extracts as green corrosion inhibitors.

Large-scale electrochemical fabrication of nitrogen-doped carbon quantum dots and their application as corrosion inhibitor for copper

A novel micro-zone electrochemical exfoliation method for the large-scale fabrication of nitrogen-doped carbon quantum dots (N–CQDs) from pre-baked carbon anode (PCA) in ammonium bicarbonate electrolyte has been demonstrated. Therefore, an efficient (90.18 wt% utilization rate of raw material and high-yield conversion of 1.87 g(N-GQDs)g(PCA)−1 due to oxidation weight gain) and environment-friendly mass production (9.36 g in one pot) for N–CQDs really becomes promising and practical. Moreover, the N-CQDs with abundant functional groups and higher nitrogen content (30.18 at%) present strong dispersion stability and enhanced interfacial adsorption with copper substrates. By virtue of the excellent performance, we successfully applied the N–CQDs as an effective inhibitor to alleviate the corrosion of copper. Results showed the corrosion inhibition efficiency of the self-assembled N–CQDs film on the copper reached up to 96.32% at 150 mg/L N–CQDs. The mechanism for the realization of large-scale preparation and self-assembly of N–CQDs was also proposed.

Insight into the anti-corrosion mechanism Veratrum root extract as a green corrosion inhibitor

The anticorrosive effect of Veratrum root extract (VRE) as the inhibitor for copper corrosion in H2SO4 solution was studied by electrochemical experiments and quantum chemistry calculation. The electrochemical experiments manifested that VRE exhibited good anticorrosion performance at a range of tested temperatures, which was further manifested by surface characterizations. The results of the Tafel test indicate that VRE belong to mixed corrosion inhibitors, which can simultaneously control the cathodic and anodic reactions of the Cu electrode. When the concentration of VRE is 200 ppm, its anti-corrosion efficiency can reach 97%. Quantum chemical calculation was employed to manifest the mechanism of adsorption and the relationship between the electronic structure of inhibitors and their anticorrosion performance.

Inhibition of Copper Corrosion by Rice Straw Extract in 2M Solution of Nitric Acid

In our research, the rice straw extract was utilized as an eco-friendly green inhibitor to prevent Cu dissolution in 2 M of HNO3. Mass loss, electrochemical tests, and surface checks were utilized to demonstrate the importance of this green extract to prevent the Cu corrosion procedure. From all tests, one can find that with increasing the dose of rice straw extract (up to 300 ppm), the protection efficacy increased to 96.8% at 25°C. Polarization curves showed that rice straw extract is a mixed-kind inhibitor that retards the anodic and cathodic reactions. From the EIS examination, the double-layer capacitance lowered by improving the dose of rice straw extract was noticed. On the other hand, the charge transfer resistance was improved. The corrosion protection (% I) of Cu occurs by the adsorption procedure, and this metal is followed by the Flory-Huggins and Langmuir adsorption isotherms. From both isotherms, the adsorption parameters were deduced. This test was also applied at different temperatures, and the activated parameters were determined and discussed. Results gotten from all used tests are in excellent harmony.

Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water

The corrosion inhibition behavior of sodium nitrite (NaNO2) towards pure copper (99.95%) in simulated cooling water (SCW) was investigated by means of electrochemical impedance spectroscopy (EIS) and dynamic electrochemical impedance spectroscopy (DEIS). NaNO2 interferes with metal dissolution and reduce the corrosion rate through the formation or maintenance of inhibitive film on the metal surface. Surface morphologies illustrated that the surface homogeneity increased on adding sodium nitrite. Sodium nitrite’s adsorption on copper surface followed the modified form of Langmuir, Freundlich and Frumkin isotherms. Physiosorption mode was involved in the corrosion protection. Electrochemical results revealed an corrosion resistance of copper increases on increasing the inhibitor concentration. The DEIS results indicated that copper corrosion mechanism could be hindered by 50% even after interval of 24 h by optimum concentration of sodium nitrite. The maximum inhibition was achieved with 2000 ppm of NaNO2. With this concentration, inhibition efficiency of up to 61.8% was achievable.

Synergistic effect of potassium iodide on corrosion inhibition of copper by tetraphosphonic acid in hydrochloric acid solution

Synergistic effect of KI on the corrosion inhibition efficiency of methylene bis [(2-hydroxy-5, 1-phenylene) bismethylene] tetraphosphonic acid (TPA) on corrosion of copper in 0.5 M HCl have been tested using weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The study show that copper is more efficiently inhibited by decreasing the concentration of TPA, and enhancement in inhibition efficiency was observed with an addition of 0.02 M potassium iodide due to synergism. The highest inhibition efficiency of 91% was observed for10−8 M TPA while an addition of 0.02 M KI to 10−8 M TPA improved the inhibition efficiency to 98%. Electrochemical test data prove that they are cathodic inhibitor and exhibit remarkable corrosion inhibition ability. The morphology confirms that the synergistic effect is due to coadsorption of iodide ions and TPA is co-operative in nature. Furthermore, the inhibition efficiency of (TPA + KI) does not depend on temperature. The adsorption of TPA alone or with iodide ions on the metal surface followed Frumkin adsorption isotherm. Thermodynamic parameters (K ads, ΔG°ads, ΔS°ads) were calculated using the adsorption isotherms from temperatures ranging from 25 to 55 °C. The experimental results were confirmed by density functional theory (DFT) and molecular dynamic simulation (MDS) calculation.

Inhibitory Effect of Some Methylxanthines on Copper Corrosion in 1M HNO3: Experimental, DFT and QSPR Studies

Inhibition corrosion of metals by using organic compounds has become an unavoidable means. So, in this work, the effect of methylxanthines on copper corrosion inhibition in 1M HNO3 was investigated by mass loss measurements and by two theoretical approaches: Density Functional Theory (DFT) and Quantitative Structure Property Relationship (QSPR.) Quantum chemical calculations based on DFT at the B3LYP/6-31G(d) level permit to establish a correlation between the quantum chemical parameters and the experimental inhibition efficiency (IE %). It was found that inhibition efficiencies increase with increasing temperature and immersion time. In addition, the QSPR approach was used to find the best set of parameters for each molecule. This set of parameters make it possible to characterize the inhibition performance of the tested molecules solution significantly. The theoretical calculations are consistent with the experimental results.

Passivation behaviour and localized corrosion activities of non-toxic surfactant derivatives on Copper

In this paper surfactant extracted from Zea mays was experimented on as a corrosion inhibitor for Copper in 0.5 M HCl solution using electrochemical measurement at 298 K at several surfactant concentrations. Open circuit potential measurement, polarization analysis, adsorption, SEM/EDX analysis, were investigated to find out how effective the surfactant is as an inhibitor on Copper. Results gotten depicts that the surfactant extracted from Zea mays performed excellently on Copper as the peak efficiency of inhibition of 86.99% at 20ml. The electrochemical polarization data revealed the inhibitor behaves as an inhibitor of the anodic type. Temkin isotherm of adsorption explained the surfactant adsorption onto the copper layer. SEM/EDX studies indicated that the corrosive impact on copper surface reduced due to the addition of the surfactant. The polarization tests have shown strong concordance with the SEM images.

New copper corrosion inhibitors in chloride environments based on benzo-[1,2,4]-triazolo-[1,2]-triazinones

New copper corrosion inhibitors in chloride environments based on benzo-[1,2,4]-triazolo-[1,2]-triazinones

Recyclization of Expired Megavit Zinc (MZ) Drug as Metallic Corrosion Inhibitor for Copper Alloy C10100 in Nitric Acid Solution

Expired Megavit zinc drug MZ was tested as a corrosion inhibitor for copper alloy C10100 in 2 M HNO3 using chemical and electrochemical techniques. The results displayed that MZ could play important role as a corrosion inhibitor for copper in 2 M HMO3. The protection efficiency increases with rise of the MZ concentrations (reached to < 66.87%) at low concentration of 400 ppm due to the adsorption of the MZ molecules on the copper surface. Furthermore, it was recognized that the adsorption obeyed Langmuir isotherm. The polarization data showed that the expired drug retards both cathodic and anodic reactions, suggesting that the expired drug acts as a mixed type of inhibitor. EIS study showed that the expired drug increases the polarization resistance by adsorbing on the metal/electrolyte interface. Cyclic voltammetry shows that the drug reduces the positive and negative overall charges produced by the applied potential, which is an indication of reducing of the corrosion rate. In addition, thermodynamic data showed that the standard adsorption energy of the drug constituents on the copper surface is negative value suggesting a spontaneous process. The obtained positive enthalpy and negative entropy change indicate that the formation of the activated complex is endothermic involving an association process, respectively.

Preparation Technology of Water Based Detergent for Q235 Carbon Steel

Q235 carbon steel is smelted by a converter or open-hearth furnace. However, it is always speckled with oil in the manufacturing process influencing its use performance. In the paper, a water-based detergent, a variety of surfactants and additives, was used to remove the oil. First, the three remarkable surfactants were selected through single-factor experiment. Then, surfactants composition was obtained by simplex formula design. Finally, the optimum formula of metal cleaner was obtained by the uniform experimental design: FMEE 1%, MOA5 2.4%, 6501 2.6%, foam inhibitor 3%, antirust agent 2.4%+AES 2%+ carboxylic acid inhibitor 1.7%+copper corrosion inhibitor 2.1%+ detergent auxiliary 1.9%+water 80.9%. The cleaning efficiency can reach more than 98%.

Corrosion inhibition properties of small peptides: DFT and Monte Carlo simulation studies

Using the computational methods of Density Functional Theory (DFT) and Monte Carlo (MC), we investigated the potential and mechanism of corrosion inhibition of iron, copper and aluminum by small peptides of aliphatic amino acids (AAs), such as L-alanine (Ala) dipeptide and tripeptide. The article provides an assessment of the local and global descriptors of the reactivity of Ala in neutral and protonated forms and its changes when combining Ala into di- and tripeptides. There was established a boost in the inhibitory effect of di- and tripeptides, due to an increase in the number of reaction centers of the molecular structure. The authors calculated the adsorption energies, and determined the most stable low energy configurations for the adsorption of alanine amino acids and small peptides on Fe (110), Cu (111), and Al (111) surfaces. It has been established that Ala and Ala-derived peptides can be absorbed on these substrates by chemisorption, predominantly located on epitaxial grooves. The absolute values of the adsorption energy between these inhibitors on the studied metal surfaces rise with an increase in the number of amino acid residues. The stronger adsorption of small peptides is also indicated by a decrease in the shortest bond lengths between the layer of on-surface Fe, Cu and Al atoms and the nearest inhibitor atoms that are characterized by the following sequence: Ala > Ala-Ala > Ala-Ala-Ala. The peptides have the best adsorption ability to the iron surface, which characterizes their highest inhibitory efficiency from a theoretical point of view. The results of the studies performed have demonstrated promising prospects for the use of small peptides as effective “green” corrosion inhibitors.

NICOTINAMIDE-BASED IONIC LIQUID AS A POTENTIAL COPPER CORROSION INHIBITOR

In this paper, the possibility of using newly synthesized ionic liquid based on nicotinamide as a potential inhibitor of copper corrosion in an acidic sulfate medium was investigated. Inhibition efficiency of butyl-nicotinamide, [C4Nic]Br on copper corrosion in acidic (pH=3) 0.1 mol/dm3 sodium sulphate solution was analyzed using potentiostatic polarization measurements and electrochemical impedance spectroscopy (EIS). It was found that the investigated ionic liquid had inhibitory properties of the corrosion of copper in acidic media. The inhibitory effect of the test compound is manifested by rapid and spontaneous adsorption of [C4Nic]Br molecules on the copper surface following Langmuir’s adsorption isotherm. As a result, the cathodic corrosion current decreases, as well as the polarization resistance of the system, increases compared with the basic solution. The inhibition efficiency of the investigated compound largely depends on the applied concentration.

Study of Novel Quinazolinone Derivatives with Different Chain Lengths as Corrosion Inhibitors for Copper in 0.5 M Sulfuric Acid Medium

Study of Novel Quinazolinone Derivatives with Different Chain Lengths as Corrosion Inhibitors for Copper in 0.5 M Sulfuric Acid Medium

Novel pyrimidine-bichalcophene derivatives as corrosion inhibitors for copper in 1 M nitric acid solution.

This study targets the investigation of three pyrimidine-bichalcophene derivatives (MA-1230, MA-1231, MA-1232) for the prevention of corrosion on copper in 1 M HNO3via weight loss (WL), potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) techniques. The surface morphology was also analyzed by different methods. It was found that the inhibition efficiency (% η) increased by increasing the doses of pyrimidine derivatives and the temperature of the medium. Weight loss data revealed the better adsorption of MA-1232 on the Cu surface at increased inhibitor dose, reaching a maximum efficiency of 99.14% at a dose of 21 μM at 45 °C. The best description of the adsorption of the investigated derivatives on the copper surface was given by the Langmuir isotherm. Some important thermodynamic parameters for the studied inhibitors were computed and are discussed herein. The polarization studies showed that the pyrimidine-bichalcophenes act as mixed inhibitors. Computational chemical approaches were used with informative yields, including quantum-chemical and molecular dynamics simulation techniques, which agree with the experimental results. The results obtained from all tested methods are strongly accepted.

Experimental and Theoretical Investigations on Copper Corrosion Inhibition by Cefixime Drug in 1M HNO3 Solution

Cefixime, a third-generation semi-synthetic cephalosporin antibiotic was used as a copper corrosion inhibitor in 1M HNO3 solution. The study was conducted through the weight loss technique at 298 - 318 K and theoretical studies based on quantum chemistry. The studied drug inhibited the corrosion of copper in 1M HNO3 over the cefixime concentration range (0.02 - 2 mM). The inhibition efficiency increased with an increase in the inhibitor concentration to reach 91.07% at 2 mM, but decreased with an increase in temperature. The thermodynamic functions related to the adsorption of cefixime on the copper surface and that of the metal dissolution were computed and analyzed. The results point out spontaneous adsorption, mainly through a physisorption mechanism following Langmuir adsorption isotherm model and an endothermic dissolution process. Quantum chemical calculations were also performed at B3LYP level with 6-31G (d, p) basis set and lead to molecular descriptors such as EHOMO (energy of the highest occupied molecular orbital), ELUMO (energy of the lowest unoccupied molecular orbital), ΔE (energy gap) and μ (dipole moment). The global reactivity descriptors such as χ (electronegativity), χ (global hardness), S (global softness), and ω (electrophilicity index) were derived using Koopman’s theorem and analyzed. The local reactivity parameters, including Fukui functions and dual descriptors were determined and discussed. Experimental and theoretical results were found to be in good agreement.

On the Application of a Dicationic Ionic Liquid as a High Performance Green Corrosion Inhibitor for Copper in 0.5 M HCL: A Reconsideration on Cathodic Inhibition Mechanism

On the Application of a Dicationic Ionic Liquid as a High Performance Green Corrosion Inhibitor for Copper in 0.5 M HCL: A Reconsideration on Cathodic Inhibition Mechanism

Corrosion Inhibition of Mild Steel with Tolyltriazole

Tolyltriazole (TTA) is a well-defined corrosion inhibitor for copper and copper alloys. However, there is little literature about its corrosion inhibition performance for mild steels in corrosive environments. This paper studied the electrochemical behavior of TTA in 0.5 M HCl solutions. Also, the morphology and nature of TTA layers on the steel surface were investigated. Electrochemical results showed that TTA is an excellent corrosion inhibitor for mild steel in acidic media with an efficiency of 91% for 0.07 M concentration. The results also indicated that TTA is a mixed-type inhibitor. XRD analysis revealed that the inhibition mechanism of TTA is based on the formation of an organic film due to the physically adsorbed molecules of TTA. AFM and EDS results showed that the formed layers decrease the adsorptivity of corrosive elements (Cl-) on the steel surface. Density Functional Theory (DFT) study confirmed the experimental results.