Mild steel corrosion inhibition by some heteroatom organic compounds in acetic acid medium (original) (raw)
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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.
International Journal of Corrosion and Scale Inhibition, 2021
Mild steel is one of the most widely used construction materials that finds various applications in industry owing to its exceptional mechanical properties and low cost. However, hydrochloric acid is widely used as an efficient pickling agent in steel industries to remove rust and scales, but it accelerates steels corrosion rate. Corrosion inhibitors are one of the most effective methods used to reduce mild steel corrosion in acidic media. In this study, new synthetics organic compounds L1, L2 and L3 were examined as corrosion inhibitors for mild steel in 1 M hydrochloric acid solutions using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). For the examined concentrations range, it was observed that the inhibition efficiency increased with increasing L1 and L2 concentrations and decreased with increasing L3 concentration. The maximum efficiency of 69% was achieved at 300 ppm of L2 at room temperature. Based on polarization studies, all the compounds were found to behave as anodic type inhibitors. SEM micrographs showed that the used inhibitors slowed down the corrosion of the surface with fewer cracks and pits observed. The quantum chemical parameters were calculated and showed a good agreement with the experimental results.
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.
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.
Transactions of the Indian Institute of Metals, 2014
The aim of this work was to investigate the inhibition effect of acid garlic essential oil (GO oil) as an inhibitor on the corrosion of carbon steel in a 1M HCl solution at different temperatures by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods. The GO oil acts as an effective corrosion inhibitor for carbon steel in a hydrochloric acid medium. The inhibition process is attributed to the formation of an adsorbed film of inhibitor on the metal surface which protects the metal against corrosion. The result indicates that the inhibition efficiency) increases as with the concentration of the inhibitor. The (%IE of GO oil depends on its concentration, and attains approximately 95.8% for 2.5 g/L at 298K. The effect of temperature on the corrosion behavior of carbon steel in 1 M HCl, with the addition of essential oil was also studied. The adsorption of the essential oil on the carbon steel surface obeyed the Langmuir adsorption isotherm. Values of inhibition efficiency calculated from weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy are in good agreement. Polarization curves showed that GO oil behaves as a mixed-type inhibitor. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated and discussed. The results obtained showed that the acid garlic essential oil could serve as an effective inhibitor of the corrosion of carbon steel in hydrochloric acid solutions.
The effect of organic based inhibitor on inhibiting the mild steel corrosion in Citric acid medium
Formazan of benzaldehyde (FB) has been prepared as a corrosion inhibitor to control the rate of corrosion. This compound has been investigated as corrosion inhibitor at room temperature for preventing mild steel corrosion in Citric acid mediums by weight loss method and by adsorption isotherm. The result showed that the corrosion inhibition efficiency of these compounds was found to vary with different acid concentration. Also, it was found that the corrosion inhibition behavior of FB is greater in 1M Citric acid and 2M Citric acid. But when it has been compared the results revealed that the inhibitor efficiency is better in 1M Citric acid than 2M Citric acid. So FB can be used has a good inhibitor for preventing mild steel material. The surface analysis study also confirms that the corrosion of the mild steel and its inhibition efficiency by the inhibitor FB
Electrochemical studies of novel corrosion inhibitor for mild steel in 1 M hydrochloric acid
Results in Physics, 2018
The electrochemical performance of a novel organic corrosion inhibitor 6-(4hydroxyphenyl)-3-mercapto-7,8-dihydro-[1,2,4]triazolo[4,3-b][1,2,4,5]tetrazine [HT3], for mild steel in 1M hydrochloric acid is evaluated by potentiodynamic curves. The experimental results show that the investigated inhibitor [HT3], which can effectively retard the corrosion process that occurs to mild steel with a hydrochloric acid solution by providing a protective coating for the mild steel that, can be weakened by increasing the temperature. Furthermore, the inhibition efficiency of [HT3] increased with increasing the concentrations of the inhibitors and decreased with increasing temperature.
The Inhibition of Carbon Steel Corrosion in Hydrochloric Acid Solution using Some Phenolic Compounds
International journal of electrochemical science
The corrosion inhibition of carbon steel in 1.0 M hydrochloric acid solution in the presence of some phenolic compounds such as o-aminophenol, catechol, salicaldehyde and salicylic acid was investigated using weight-loss method ,potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Results obtained showed that the inhibition efficiency of these compounds increased by increasing their concentration but decreases with a rise in temperature. The effect of the investigated compounds and KI, KSCN and KBr has also been studied. The apparent activation energy (E a ) and other thermodynamic parameters for the corrosion process have also been calculated. The potentiodynamic polarization data indicated that the inhibitors were of mixed-type. The slopes of the cathodic and anodic Tafel lines (β c and β a ) are approximately constant and independent of the inhibitor concentration. The adsorption of these compounds on C-steel surface has been found to obey the Freundlich adsorption isotherm. Double layer capacitance, C dl , and charge transform resistance, R ct , values were derived from Nyquist and Bode plots obtained from A.C. impedance studies. The mechanism of inhibition was discussed in the light of the chemical structure of the undertaken inhibitors.
Two organic compounds namely, Phenylalanine (P1) and Aspartic acid (P2) have been studied for inhibiting mild steel (MS) corrosion in molar hydrochloric acid solution. The Anti-corrosion activity has been evaluated using electrochemical impedance spectroscopy (EIS), potentio-dynamic polarization (PDP), Density Functional Theory (DFT), Monte-Carlo Simulation (MCS) and Molecular Dynamic Simulation (MDS). The corrosive solutions were analyzed by UV-visible spectrometry (UV-vis). The surface of MS after the corrosion tests was analyzed by Scanning Electron Microscopy (SEM). The inhibition efficiency of the two amino acids (P1 and P2) increased by the increase in their concentration and reached an optimal value of 87% and 89% for P1 and P2 respectively. Their adsorption mechanism was consistent with the isotherm Langmuir. Polarization measurements led to the conclusion that the two compounds act as mixed inhibitors. UV-visible shows that the addition of the two compounds decreases the dissolution of ferric ions in the corrosive solutions. Scanning Electron Microscopy (SEM) images show that both inhibitors were well adsorbed on the MS surface. Computational approaches of the metal-inhibitor interaction type were studied and interpreted using DFT, MCS and MDS.