Corrosion Inhibition of Galvanized Steel in Hydrochloric Acid Solution using ¬¬ 1,8-Diazabicyclo[5.4.0]undec-7-ene as New Organic Inhibitor (original) (raw)
Related papers
2014
The inhibition of the corrosion of Mild Steel (MS) in 1 M HCl solution by a new synthesised organic compound, namely 1,1'-(2,2'-(2,2'-oxybis(ethane-2,1-diyl)bis (sulfanediyl))bis(ethane-2,1-diyl))diazepan-2-one, has been studied by weight loss measurements, electrochemical polarisation and electrochemical impedance spectroscopy (EIS). The experimental results have showed that this organic compound revealed a good corrosion inhibition and the inhibition efficiency is increased with the inhibitor concentration to reach 97% at 1 mM. Potentiodynamic polarisation suggested that it is a mixed type of inhibitor. EIS measurements show an increase of the polarisation resistance with the inhibitor concentration and the electrical equivalent circuit is determined. The inhibitor adsorption process on (MS) surfaces obeys the Langmuir adsorption isotherm and the adsorption isotherm parameters (K ads , ∆G ads , ∆H ads and ∆S ads) were determined. The temperature effect on the corrosion behaviour of (MS) in 1 M HCl without and with inhibitor at different concentration was studied in the temperature range from 308 to 353 K and the kinetic parameters activation such as E a , ∆H a and ∆S a were evaluated.
2021
One of the ways of reducing metal corrosion and its devastating effects is by using organic corrosion inhibitors. This is because of the π-conjugation in their moieties, their ability to donate electrons to the metal’s vacant d-orbitals, and their low lying LUMO orbitals for accepting electrons as well from the metal, all these improve their adsorption on the metal surface. (E)-5-((4-benzoylphenyl)diazenyl)-2-hydroxybenzoic acid (AD4) was synthesized via the coupling reaction of p-aminobenzonephenone and Salicylic acid, characterized via FTIR, UV/Vis, 1H-NMR, and 13C-NMR spectroscopy. The melting point of AD4 is 103oC–106oC indicating that it is thermally stable and pure. Gravimetric and potentiodynamic polarization techniques were employed to obtain the corrosion rates (Cr) and percentage inhibition efficiency (%IE) at different concentrations of the inhibitor and at different temperatures. The thermodynamic parameters like Enthalpy, ∆Hoads, Entropy, ∆Soads and free energy of adsor...
Journal of the Mexican Chemical Society
Three organic inhibitors based 5-Chloroisatin's bases, namely, 1-allyl-5-chloro-indoline-2,3-dione (TZACI). 5-chloro-1-(2-(dimethylamino) ethyl) indoline-2,3-dione (TZCDI),5-chloro-1-octylindoline-2,3-dione (TZCOI) were influence on corrosion inhibition of mild steel in 1.0M hydrochloric acid solution. The inhibition efficiency increased with the increase of a compound concentration in the case of these three inhibitors, which have the mixed type behavior proposed by the polarization studies. Impedance measurements showed that after the addition of inhibitors, charge-transfer resistance increased and double-layer capacitance decreased, involving increased inhibition efficiency. The adsorption of three inhibitors on a steel surface obeyed Langmuir model. Free energy of adsorption showed that the type of adsorption was physical for TZACI and chemical for the TZCDI, TZCOI. Scanning electron microscopic analyses confirm the formation of the protective film on the surface.
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Benzoic acid, salicylic acid, Anthranilic acid, 2-Nitro benzoic acid, 2-Chlorobenzoic acid compounds containing acidic group as a corrosion inhibitor for carbon steel was investigated. The study revealed that the various group such as (-COOH, OH, Cl and-NO 2) containing in organic compounds has an inhibitory action on the corrosion of carbon steel in the investigated medium. Corrosion rate of mild steel was studied using chemical weight loss method at room temperature. This research paper presents use of carboxylic group organic compounds as corrosion inhibitors for metals in 0.1N, 0.01N and 0.001N (HCl, HNO 3 and H 2 SO 4) acidic medium. A common mechanism for inhibiting corrosion involves formation of a coating, often a passivation layer, which prevents access of the corrosive substance to the metal. Organic corrosion inhibitors adsorb on the surface to form protective film, which displace water and protect it against deteriorating. Effective organic corrosion inhibitors contain nitrogen, oxygen, sulphur and phosphorus with lone electron pairs as well can contain structural moieties with π-electrons that interact with metal favouring the adsorption process. This review presents mechanisms and monitoring of corrosion, laboratory methods for corrosion study, relationship between structure and efficacy of corrosion inhibitions, theoretical approach to design new inhibitors and some aspects of corrosion.
Physical Chemistry Research, 2020
Corrosion of metal surfaces amongst other problems is one major disaster militating against proper functioning of the oil and gas and other manufacturing industries. To therefore lessen the risk, organic corrosion inhibitors have been applied to lessen the rate of corrosion and its effects. However, materials with optimal properties, better than content that allow corrosion are used for this empirical research. (E)-4-hydroxy-3-(2,4,6-tribromophenyl)diazenyl)benzaldehyde was synthesized and elucidated via FTIR, UV/Vis and NMR (1H and 13C) spectroscopy. Weight loss and potentiodynamic polarization methods were understudy to determine the rate of corrosion (Cr) and percentage inhibition efficiency (%IE). The mechanism of adsorption agrees with the Langmuir adsorption isotherm. The surface morphology of the mild steel was determined using the SEM in the bi-condition of the presence and absence of inhibitor. Inhibition efficiency (IE) was varied with concentration and temperature. The re...
Ionics, 2019
Isoniazid (anti-biotic) derivatives-PA1 {(E)-N′-(4′-Hydroxy-3-methoxybenzylidene) isonicotino hydrazide}, PA2 {(E)-N ′-(Pyridin-4′-ylmethylene) isonicotino hydrazide}, and PA3 {(E)-N′-(Pyridin-3′-ylmethylene) isonicotino hydrazide} were synthesized, characterized, and further examined for corrosion protection activities on mild steel (MS) in 1 M HCl via experimental, theoretical, and surface analysis. Electrochemical processes in the presence of different concentration of tested compounds were characterized as charge transfer controlled and revealed stable, spontaneous corrosion inhibition by inhibitors on mild steel in acidic media. The values evaluated for free energy change (ΔG 0 ads) assured the involvement of chemisorption process. Adsorption data was found well fitted in Langmuir isotherm. Enthalpy and entropy parameters obtained by computational analysis using ADF-band revealed parallel alignment of PA1 on the surface of mild steel as best alignment for optimal adsorption. Theoretically, computed adsorption-free energy (ΔG 0 ads) and adsorption constant (K ads) values for parallel alignment complemented the experimentally determined values.
Development of new corrosion inhibitor tested on mild steel supported by electrochemical study
Results in Physics, 2018
Mild steel is a metal which is commonly used in industrials and manufacturing of equipment for most industries round the world. It is cheaper cost compared with the other metals and its durable, hard and easy-to-wear physical properties make it a major choice in the manufacture of equipment parts. The main problem through the uses of mild steel in industry is its resistance against corrosion, especially in acidic solutions. This case led to raise the cost of maintenance of equipment that used mild steel and as a result increased costs for the company. Organic corrosive inhibitors that also act as green chemicals, 4-hydroxybenzylideneaminomethyl-5-ethyl-1,3,4-thiadiazolhave been synthesized. This inhibitor is tested as corrosion inhibitor on a mild steel sample MS in 1M hydrochloric acid solution (HCl) using electrochemical measurements test includes PD (Potentiodynamic), EIS (Electrochemical impedance spectroscopy), OCP (Open circuit potential) and EFM (electrochemical frequency modulation). The obtained results indicate that 4-hydroxybenzylideneaminomethyl-5-ethyl-1,3,4-thiadiazol acts as a good corrosion inhibitor for mild steel sample in HCl solution with efficiency above 90%. Changes in the impedance parameters postulated adsorption on the mild steel specimens' surfaces of, which it going to the formation of protective coating layer. It also shows that 4-hydroxybenzylideneaminomethyl-5-ethyl-1,3,4-thiadiazolcorrosion inhibitors are 2 effective in helping to reduce and slow down the corrosion process that occurs on mild steel surface in hydrochloric acid solution. Increase of corrosion inhibitor concentration provides a protective layer of mild steel. However, this protective layer becomes weak when the temperature of the solution increases.
Int. J. Electrochem …, 2012
The inhibitor effect of 1,7− bis (2hydroxy benzamido)-4-azaheptane H 4 L 3 on the corrosion of mild steel in 1M hydrochloric acid (HCl) has been investigated at 308 K using weight loss measurements and electrochemical techniques (impedance spectroscopy and polarisation curves). Inhibition efficiency is dependent upon the 1,7− bis (2hydroxy benzamido)-4-azaheptane H 4 L 3 concentration and its inhibition efficiency increases with the increase of concentration of inhibitor to attain 96 % since 10-3 M. Polarisation curves indicate that 1,7− bis (2hydroxy benzamido)-4-azaheptane H 4 L 3 act essentially as mixed inhibitors. EIS measurements show an increase of the transfer resistance with the inhibitor concentration. The temperature effect on the corrosion behaviour of steel in 1M HCl without and with the inhibitor at 10-3 M was studied in the temperature range from 308 to 333 K, the associated activation energy have been determined. Adsorption of 1,7− bis (2hydroxy benzamido)-4-azaheptane H 4 L 3 on the mild steel surface in 1M HCl follows the Langmuir isotherm model. Significant correlations are obtained between inhibition efficiency with the calculated chemical indexes, indicating that variation of inhibition with structure of the inhibitor may be explained in terms of electronic properties.
Scientific Reports
The synergistic properties of the combined admixture of benzenecarbonitrile and 5-bromovanillin (BNV) on the corrosion resistance of 1018 carbon steel in 1 M HCl was analysed with potentiodynamic polarization technique, weight loss method, micro-analytical studies and ATF-FTIR spectroscopy. Results obtained show the admixed organic compound was effective with optimal corrosion inhibition values of 99.33% and 90.34% at 1.25% BNV concentration from both electrochemical methods due to the effective inhibition action and passivation characteristics of the protonated inhibitor molecules in the acid solution. Primary amines, stretch alkyl halides and C-H triple bond functional groups of the molecules were observed to actively adsorb during the corrosion inhibition reaction from ATF-FTIR spectroscopic analysis. Calculations from thermodynamic evaluation confirmed cationic adsorption mechanism to be chemisorption obeying the Langmuir and Frumkin adsorption isotherm. Microanalytical observations of the inhibited carbon steel morphology significantly contrast the unprotected steel due to visible surface deterioration and presence of micro/macro-pits. The organic derivatives showed mixed type inhibition reactions. Carbon steel corrosion in aggressive industrial environments is of immense economic importance due to the extensive application of the alloy. They are employed as a construction material, storage containers, reservoirs and equipment parts in chemical processing plants, mining industry, power generation and petrochemical industries. In oil and gas they are applied for pipe work in down hole tubular, flow lines and transmission pipelines 1-4. Under a variety of conditions they are used for handling alkaline, acidic and salt solutions. Solutions containing as low as trace amounts of chlorides, sulphates and nitrate ions in aqueous media are notably aggressive and accelerate corrosion of carbon steel. Acid solutions are utilized in the removal of impurities, rust and scales in mining and extraction processes such as in oil-well acidizing, industrial acid cleaning, acid-descaling and acid pickling; however in the presence of chemical compounds known as inhibitors, corrosion of carbon steel is effectively controlled. Most well-known compounds for corrosion inhibition have been recently discovered to be carcinogenic and environmentally unfriendly 5,6. Recently in industrial plants it has become a common practice to use chemical inhibitors based environmental sustainability and cost in addition to their inhibition efficiency 7. A number of organic chemical compounds have been known to be environmentally friendly and effective corrosion inhibitors. Generally, these compounds adsorb on the metal surface and form a passive film which suppresses the redox electrochemical processes responsible for the propagation of corrosion 8-11. These compounds contain heteroatoms (nitrogen, oxygen, sulphur etc.) which protonates in solution, donating unshared electron pairs, unsaturated bonds (such as double bonds, or triple bonds), and plane conjugated systems including all kinds of aromatic cycles in their structures 12-14. Synergistic effect of chemical compounds is one of the most important methods in corrosion inhibition process which serves as the basis for most of the modern corrosion inhibiting admixtures 15,16. In furtherance of the drive for cost effective and environmentally benign corrosion inhibitors, this research focuses on the evaluation of
2022
This current research focuses on the protective mechanism of mild steel when exposed to 1M hydrochloric acid solution in the presence of synthesized 1,1,4,4-tetramethyl-1,4-diocty lethylenediammonium bromide (TDEDB) as an inexpensive inhibitor using weight loss studies. The following parameters namely effect of inhibitor, the effect of temperature and the effect of pH were evaluated at different concentrations and conditions. It was revealed that the coverage of the inhibitor and the interaction over the mild steel is by the process called adsorption. A remarkable improvement was observed by the addition of inhibitor when compared to blank solution. More over increasing the concentrations of synthesized inhibitor played a vital role and the same was proven by the weight loss methodology. It evidences that at 250 ppm the maximum adsorption occurs on the mild steel which results in curtailment of the corrosion reaction.