Inhibition Of Acid Corrosion Research Articles

Multicomponent click synthesis of new 1,2,3-triazole derivatives of pyrimidine nucleobases: promising acidic corrosion inhibitors for steel.

A series of new mono-1,2,3-triazole derivatives of pyrimidine nucleobases were synthesized by one-pot copper(I)-catalyzed 1,3-dipolar cycloaddition reactions between N-1-propargyluracil and thymine, sodium azide and several benzyl halides. The desired heterocyclic compounds were obtained in good yields and characterized by NMR, IR, and high resolution mass spectrometry. These compounds were investigated as corrosion inhibitors for steel in 1 M HCl solution, using electrochemical impedance spectroscopy (EIS) technique. The results indicate that these heterocyclic compounds are promising acidic corrosion inhibitors for steel.

Thermal analysis and FTIR studies of volatile corrosion inhibitor model systems

Abstract Model compounds simulating amine–carboxylic acid-based volatile corrosion inhibitors were characterized by thermogravimetric analysis and Fourier transform infrared spectroscopy. These systems are usually employed as equimolar mixtures to protect ferrous metals against atmospheric corrosion. The key finding of this study was that the vapors released by such equimolar mixtures initially contain almost free amine only. After prolonged vaporization a steady-state azeotrope-like composition is approached. It contains excess carboxylic acid and features impaired corrosion inhibition efficiency according to the Skinner test. In part, this behavior can be attributed to the mismatch in the volatilities of the amine and carboxylic acid constituents.

Thiadiazole derivatives as inhibitors for acidic media corrosion of artificially patinated bronze

Electrochemical impedance spectroscopy (EIS) and SEM‐EDX observations were used to evaluate the inhibiting effect of four thiadiazole derivatives, i.e. 2‐mercapto‐5‐amino‐1,3,4‐thiadiazole (MAT), 2‐mercapto‐5‐methyl‐1,3,4‐thiadiazole (MMeT), 2‐mercapto‐5‐acetylamino‐1,3,4‐thiadiazole (MAcAT) and 2‐mercapto‐5‐phenylamino‐1,3,4‐thiadiazole(MPhAT) on the corrosion of naked and artificially patinated bronze surface exposed to an acidic solution (pH 3) that simulates a strongly polluted rainfall. For comparison reasons, the inhibiting effect of benzotriazole (BTA) was also examined. In an attempt to better understand the influence of solution pH on the adsorption of the thiadiazole derivatives and to correlate their structural and electronic characteristics with the experimental inhibition efficiencies, quantum chemical calculations were performed starting with thiadiazole and its protonated derivatives. Finally, a possible inhibition mechanism of the thiadiazole protonated species on bronze corrosion was proposed. It was concluded that MMeT and MAT allow the stabilization of the patina layer, leading to the protection of the bronze substrate and their effectiveness significantly increase with the immersion time.

Kappaphycus alvarezii – A marine red alga as a green inhibitor for acid corrosion of mild steel

The anticorrosion potential of Kappaphycus alvarezii on mild steel in both 1 M HCl and H2SO4 media has been studied using weight loss method at three different temperatures, electrochemical measurements, and surface analyses. The results revealed the inhibitive effect of K. alvarezii. The inhibition efficiency was found to increase with increasing concentration of the algal extract but decreased with increase in temperature which is attributed to the physisorption. The adsorption of the extract on the mild steel surface obeys the Temkin adsorption isotherm. Further, scanning electron microscope (SEM) and atomic force microscope (AFM) analyses supported the inhibitive action of this red alga by the formation of protective layer over the mild steel surface.

Application of Chicory as Corrosion Inhibitor for Acidic Environments

Summary During acidizing stimulation or cleanup operations, metal tubulars, downhole tools/valves, and surface lines are exposed to acidic fluids and are prone to corrosion. Because corrosion rates drastically increase in high-temperature wells, controlling corrosion is critical and must be dealt with carefully. In addition, corrosion protection is important for maintaining the integrity and long life of downhole tools installed in a well. Several corrosion inhibitors, such as quaternary ammonium compounds and propargyl alcohol-based compounds, have been effectively used in the industry. However, because of stringent environmental regulations, attention has focused on the development of new corrosion inhibitors that are environmentally benign. Food-grade products that are considered "green" chemicals have significant potential as corrosion inhibitors in the oil and gas industry. In this paper, application of chicory as a corrosion inhibitor for high-temperature and strong-acidic conditions is discussed. Chicory is a perennial bush plant available in many parts of the world. The root of the chicory plant can be roasted and ground for use as a coffee substitute or additive. Chicory is environmentally acceptable and, being of plant origin, is widely recognized as biodegradable in nature. This study shows that chicory can provide corrosion protection for alloys such as N-80, 13Cr-L80, and 1010 steel in the presence of either inorganic or organic acids at temperatures up to 250°F (121°C). Considering its performance and lack of toxicity issues, chicory has significant potential for acid corrosion-inhibition applications. The mixing procedure for preparing the blend, experimental setup and test procedure, and laboratory results of high-pressure/high-temperature (HP/HT) corrosion tests are discussed.

Computational and Experimental Evaluation of the Acid Corrosion Inhibition of Carbon Steel by 7-Methyl-2 Phenylimidazo[1,2-α]Pyridine

Computational and Experimental Evaluation of the Acid Corrosion Inhibition of Carbon Steel by 7-Methyl-2 Phenylimidazo[1,2-α]Pyridine

Acute renal failure associated with diphosphonic ACID (HEDP): A case report

A 26-year-old man with no significant past medical history presented to emergency department 1 hr after ingesting approximately 200 ml of HEDP 2010 organophosphoric acid corrosion inhibitor. He had normal vital signs, physical examination and biochemical parameters. After 24 hr, he developed nausea with a decreased urine output. While his blood urea nitrogen, creatinine and uric acid levels increased to 36 mg/dl, 3.87 mg/dl, and 8.4 mg/dl, respectively; his serum calcium and phosphorus levels decreased to 7.4 mg/dl and 1.4 mg/dl, respectively. He had proteinuria, glucosuria, leukocyturia and high phosphorus excretion in the urine. On ultrasonographic examination, the kidneys were slightly enlarged and edematous. On the third day of hospitalization, creatinine level increased to 8.81 mg/dl and metabolic acidosis developed. He underwent to hemodialysis therapy and renal functions improved uneventfully. This case represents an example of acute renal failure developed and recovering uneventfully after unintentionally ingestion of a bisphosphonate used in industry.

CO and trans-cinnamaldehyde as corrosion inhibitors of I825, L80-13Cr and N80 alloys in concentrated HCl solutions at high pressure and temperature

In this paper, corrosion inhibition by chemisorbed CO, at high pressure and temperature, on a high-Ni ferrous alloy (Incoloy 825) and two high-Fe alloys (13Cr-L80 (Uniloy-420) and N80 steels) in very aggressive conditions (15% (w/w) HCl solution) is described. CO was either directly dosed into the electrolyte, or produced by dehydration of formic acid. It is shown that CO is a very good corrosion inhibitor, the inhibiting effect being even higher at high pressure and temperature than at normal pressure and room temperature. The effect of combining CO with a common acid corrosion inhibitor, trans-cinnamaldehyde (TCA), at high pressure and temperature, was also studied. Under these conditions, the polymerization of TCA may be favored, leading to a thin film on the metal surface that appears to serve as a barrier to corrosion. It was found that, when CO is used in combination with TCA, the inhibiting effect of the latter is considerably intensified.

Adsorption and inhibitive properties of Tryptophan on low alloy steel corrosion in acidic media

The inhibition efficiency of Tryptophan (Trp) has been studied for the corrosion of low alloy steel ASTM A213 grade T22 in sulfamic (HSO3NH2) and hydrochloric (HCl) acid solutions.Corrosion inhibition was studied using electrochemical methods (electrochemical impedance spectroscopy; EIS and the new technique electrochemical frequency modulation; EFM) and weight loss measurements. The influence of inhibitor concentration, solution temperature, and immersion time on the corrosion resistance of low alloy steel (LAS) has been investigated. Trp proved to be a very good inhibitor for low alloy steel acid corrosion. EFM measurements showed that Trp is a mixed type inhibitor. Trp behaved better in 0.6M HCl than in 0.6M HSO3NH2. Moreover, it was found that the inhibition efficiency increased with increasing inhibitor concentration, while a decrease was detected with the rise of temperature and immersion time. The associated activation energy (Ea) has been determined. The values of Ea indicate that the type of adsorption of Trp on the steel surface in both acids belongs to physical adsorption. The adsorption process was tested using Temkin adsorption isotherm.

Inhibition of Sulphuric Acid Corrosion of Mild Steel by Surfactant and Its Adsorption and Kinetic Characteristics

The corrosion inhibition effect of surfactant, N,N-Dimethyl-N-(2-Phenoxyethyl)dodecan-1- aminiumbromide(DPDAB) on mild steel corrosion in 0.5M Sulphuric acid was investigated by weight loss, potentiodynamic polarization and Electrochemical impedance spectroscopic techniques. DPDAB is an excellent inhibitor and its inhibition efficiency increases with increase in concentration and maximum inhibition efficiency was observed above the critical micelle concentration (CMC). The polarization curves reveal that DPDAB acts as mixed type inhibitor with predominantly of anodic type. The corrosion inhibition efficiency of DPDAB increases with increase in concentration and decreases with increase in temperature from 298K to 308K and then increases and shows maxima at 318K and then decreases at 328K.. The adsorption of the inhibitor on the mild steel in 0.5M H2SO4 was found to obey Langmuir's adsorption isotherm. Scanning electronic microscopy (SEM) confirmed the existence of an adsorbed protective film on the metal surface. The kinetic and thermodynamic parameters were calculated and discussed.

Inhibition of acid corrosion of mild steel by Anacyclus pyrethrum L. extracts

Inhibition of the corrosion of mild steel in sulfuric acid by extracts of Anacyclus pyrethrum L. (leaves and stems, AP-LS; flowers AP-F; roots, AP-R) has been studied by use of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. Anacyclus pyrethrum L. inhibited the corrosion of mild steel in 0.5 M H2SO4 solution. Polarization curves show that the different parts of plants act as anodic type inhibitors. Changes in impedance data (charge transfer resistance, Rt, and double layer capacitance, Cdl) were indicative of adsorption of the extracts on the metal surface, leading to the formation of protective films. The extent of surface coverage by the inhibitors was determined by measurement of ac impedance; it was found that adsorption of these inhibitors on the mild steel surface obeys the Langmuir adsorption isotherm. Activation energies in the presence and absence of AP-LS and AP-F were obtained by measuring the temperature dependence of the corrosion current.

Ethanolic extract of Ruta chalepensis as an eco-friendly inhibitor of acid corrosion of steel

Ruta chalepensis extract (Ruta) was tested as a corrosion inhibitor for steel in 1 M HCl. Weight loss measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) were used. The inhibiting action increases with increasing concentration of the tested inhibitor. Efficiency is highest, 87 %, for 3.5 g/L Ruta extract. It acts on the cathodic domain without modifying the reduction mechanism. We note good agreement between gravimetric and electrochemical methods (potentiodynamic polarisation and EIS). Polarization measurements also show that Ruta extract is a good mixed inhibitor. The effect of temperature on the corrosion behaviour of steel in 1 M HCl was also studied in the temperature range 298–338 K. Thermodynamic data for activation were determined. Ruta extract is adsorbed on the steel surface in accordance with a Temkin adsorption model.

Hydroclathrus clathratus marine alga as a green inhibitor of acid corrosion of mild steel

The corrosion inhibitive and adsorption behaviors of Hydroclathrus clathratus on mild steel in 1 M HCl and 1 M H2SO4 solutions at 303, 313 and 323 K were investigated by weight loss, electrochemical, and surface analysis techniques. The results show that H. clathratus acts as an inhibitor of corrosion of mild steel in acid media. The inhibition efficiency was found to increase with increase in inhibitor concentration but to decrease with rise in temperature, suggestive of physical adsorption. The adsorption of the inhibitor onto the mild steel surface was found to follow the Temkin adsorption isotherm. The inhibition mechanism was further corroborated by the results obtained from electrochemical methods. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses supported the inhibitive action of the alga against acid corrosion of mild steel.

Acid Corrosion Inhibition of Steel by Lamotrigine

Corrosion inhibition effect of lamotrigine on steel in 1.0 M HCl and 0.5 M H2SO4 was studied by techniques like weight loss, polarisation, and electrochemical impedance spectroscopy. Results indicated that lamotrigine is more competent in HCl than in H2SO4 and is justified by scanning electron micrographs. Protection efficiency increased with the concentration of inhibitor and decreased with temperature. Adsorption study revealed the comprehensive adsorption of lamotrigine molecules on steel surface.

The Synthesis and Evaluation of N-carbonyl Piperazine as a Hydrochloric Acid Corrosion Inhibitor for High Protective 13Cr Steel in an Oil Field

A new inhibitor—N-carbonyl piperazine aimed at anticorrosion of high protective 13Cr steel was synthesized by electrochemistry together with ionic liquid. Its molecule structure was analyzed by gas chromatography/mass spectrometry and infrared spectroscopy. On that base, the inhibition mechanism of N-carbonyl piperazine on the corrosion of high protective 13Cr steel in 4 M HCl had been studied by polarization, electrochemical impedance spectroscopy, weight loss, and scanning electron microscopy measurements. The results indicated that N-carbonyl piperazine acted as mixed type (cathodic/anodic) inhibitor and showed 93.7% inhibition efficiency at concentration of 44 mM.

A novel water‐soluble, conducting polymer composite for mild steel acid corrosion inhibition

AbstractA novel water‐soluble conducting polymer composite, poly(vinyl alcohol‐histidine) was synthesized from aqueous solution by free radical condensation using persulfate. The composite was characterized using UV–Visible, Fourier transform infrared, scanning electron microscopy, thermogravimetric analysis (TG/DTG), and differential scanning calorimetry techniques while its AC conductance was measured by LCZ analyzer. The inhibitive action of the composite on the corrosion behavior of mild steel in 1M HCl was studied by conventional weight loss method, potentiodynamic polarization studies (Tafel), linear polarization studies, and electrochemical impedance spectroscopy. The effects of inhibitor concentrations, exposure time, and temperature have been investigated. The corrosion rate, inhibition efficiency (IE), and other parameters have been evaluated for different inhibitor concentrations. The composite provided more than 95% IE at an optimum concentration of 0.6% by weight. The results showed the composite as an effective mixed type inhibitor. The adsorption of this inhibitor obeyed Temkin adsorption isotherm. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Computational and experimental evaluation of the acid corrosion inhibition of steel by tacrine

The electronic parameters of tacrine were evaluated by quantum chemical method to assess its corrosion inhibition potential. Further, it was confirmed by chemical and electrochemical studies on steel in 1.0M HCl and 0.5M H2SO4. It was found that tacrine performed better than the quantum prediction which is attributed to the planarity of the molecule. Also, tacrine is found to be more efficient in 1.0M HCl than in 0.5M H2SO4, which according to potential of zero charge study, is due to acid anions Cl− and SO42-. Tacrine pursued Langmuir adsorption isotherm.

Study on the Anti- Corrosion Properties of Organic and Inorganic Inhibitor by Electrochemical Treatment in Aqueous Solution

The various methods for improving chloride penetration resistance in the reinforced concrete have been developed. Among the related general ways, using of corrosion inhibitor became very common. Therefore, in this study, in order to comprehend performance of corrosion inhibitor, the experiment study was conducted about corrosion characteristic of 3 steps(0.0, norm 1/2, norm) compared to organic corrosion inhibitor standard use of liquid and molar 3 steps(0.0, 0.3, 0.6%) of Chloride by added amount of inorganic corrosion inhibitor by the corrosion inhibitor types about 2.4kg/m3, 4.8kg/m3based on Chloride ion content 1.2kg/m3for service life prediction of concrete structure by using Poteniostat. As results, in the case of inorganic nitrous acid corrosion inhibitor, it was confirmed that anti-corrosive performance of Chloride ion content 1.2kg/m3by corrosion Ecorr -0.30V in more than molar ratio 0.3%, and it also was confirmed that anti-corrosive performance of 2.4kg/m3, 4.8kg/m3in more than molar ratio 0.6%. In addition, the excellent anti-corrosive performance of organic corrosion inhibitor was shown in 1/2(0.42kg/m3) of norm regardless of Chloride ion content, and it can be seen that absorption types organic corrosion inhibitor has excellent anti-corrosive performance compared to the inorganic nitrous acid corrosion inhibitor by the added amount of corrosion inhibitor.

Molecular Dynamics Simulation of the Adsorption Behavior of Amino Acid Corrosion Inhibitor on Cu (001) Surface

Molecular dynamics simulation has been employed to investigate the adsorption behavior of glutamic acid and aspartic acid on Cu (001) surface, and the inhibition mechanism was also discussed. The results indicated that the two corrosion inhibitors could both adsorb on the Cu surface firmly due to the interaction between polar groups and surface. The two inhibitors both have excellent corrosion inhibition performance. However, the inhibition performance of glutamic acid is better than aspartic acid.

Water soluble conducting polymer composite of polyvinyl alcohol and leucine: An effective acid corrosion inhibitor for mild steel

AbstractA new corrosion inhibitor namely poly(vinyl alcohol‐leucine) composite (PVAL) has been synthesized and its influence on corrosion inhibition of mild steel in 1 M hydrochloric acid solution has been studied by weight loss and potentiodynamic polarization techniques. The composite (PVAL) showed more than 95% inhibition efficiency (IE) at an optimum concentration of 0.6% by weight. The inhibition efficiency of inhibitor has been found to vary with inhibitor concentration, solution temperature, and immersion time. Various kinetic and thermodynamic parameters (Ea, ΔHo, ΔSo for corrosion and ΔGads, ΔHads, ΔSads for adsorption) reveal a strong interaction between inhibitor and mild steel surface. The negative values of ΔGads indicate the spontaneous adsorption of the inhibitor on mild steel surface. Potentiodynamic polarization studies showed PVAL as mixed type inhibitor. It inhibits mild steel corrosion by blocking the active sites of the metal. Electrochemical impedance spectroscopic (EIS) techniques were also used to investigate the mechanism of corrosion inhibition.