EVALUATION OF TETRA-n-BUTYLAMMONIUM BROMIDE AS CORROSION INHIBITOR FOR MILD STEEL IN 1N HCl MEDIUM: EXPERIMENTAL AND THEORETICAL INVESTIGATIONS (original) (raw)
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The corrosion inhibition of mild steel in one normal sulphuric acid solution by tetra methyl ammonium bromide (TMAB) has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic polarizations) techniques. The results were supplemented with scanning electron microcopy and infra-red spectroscopy. All the methods employed are in reasonable agreement. There is no particular relationship of inhibition with concentration and temperatures. The thermodynamic functions of dissolution and adsorption processes were calculated from experimental polarization data and the interpretation of the results are given. Adsorption of TMAB was found to follow the Langmuir's adsorption isotherm. TMAB is a mixed type of inhibitor.
Journal of Chemical Engineering and Materials Science, 2012
The corrosion inhibition of mild steel in one normal sulphuric acid solution by tetra methyl ammonium bromide (TMAB) has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic polarizations) techniques. The results were supplemented with scanning electron microcopy and infra-red spectroscopy. All the methods employed are in reasonable agreement. There is no particular relationship of inhibition with concentration and temperatures. The thermodynamic functions of dissolution and adsorption processes were calculated from experimental polarization data and the interpretation of the results are given. Adsorption of TMAB was found to follow the Langmuir's adsorption isotherm. TMAB is a mixed type of inhibitor.
Abstract The corrosion behavior of mild steel in 0.5M Sulphuric acid containing different concentrations of N,N,Ntrimethyldodecylammonium bromide (TDAB) has been studied by weight loss, Tafel polarization and Electrochemical impedance spectroscopic techniques at 298, 308, 318 and 328K respectively. The mild steel samples were also analyzed by scanning electron microscopy. Electrochemical and impedance parameters such as corrosion potential, corrosion current density, Tafel slopes, charge transfer resistance and electrical double layer were determined. The kinetic and thermodynamic parameters for mild steel corrosion and inhibitor adsorption, respectively, were determined and discussed. The results showed that concentration of Inhibitor and test temperatures can affect the % inhibition efficiency. The % corrosion inhibition efficiency increases with increase in concentration and decreases with increase in temperature. The maximum corrosion inhibition efficiency obtained is 95.5%. As ...
IOSR Journal of Applied Chemistry, 2012
N, N-dimethyl-N-(2-phenoxyethyl) dodecan-1-aminiumbromide has been evaluated as a corrosion inhibitor for mild steel in 1MHCl solution using potentiodynamic polarization, electrochemical impedance spectroscopy and atomic force microscope and Scanning electron microscope measurements. According to the experimental results, inhibition efficiency increased with increasing inhibitor concentration. Potentiodynamic measurements showed that the presence of inhibitor molecules decreases cathodic and anodic currents and shifts corrosion potential to a more positive potential region. Adsorption of the inhibitor molecules to the mild steel surface obeyed the Langmuir adsorption isotherm. Adsorption free energy was calculated from the adsorption isotherms as-31.33 to-39.0kJmol−1. The negative value of ΔG ads showed that the adsorption process is spontaneous for the studied conditions. In addition, measurements were carried out at different solution temperatures to determine temperature dependence of the adsorption process. At all studied temperatures, the inhibitor molecule protected mild steel with the same effect.
Eurasian Journal of Analytical Chemistry, 2017
This study investigates corrosion inhibition of X70 steel surfaces, by Butyl-Quaternary-Ammonium halides, in a 3% of NaCl solution with pH = 6. In the first part, the influence of inhibitor concentration study reveals that the I-TBA is the best inhibitor (≈79% on the X70 steel). Each compounds exhibits Langmuirian behaviour and the values of ΔG° indicate that we have a physical adsorption. In the second part, the influence of immersion time study on the stability of the formed films reveals that they are stable and require about 150 min to be established, and deliver efficiencies that overtake the 70% in all cases. The stationary polarization curves and electrochemical impedance spectroscopy (EIS) diagrams show the high inhibitory effect of iodide compared with other halides.
Journal of Advanced Research, 2014
The corrosion inhibition of mild steel in 0.5 M H 2 SO 4 solution has been investigated using electrochemical methods, X-ray diffraction (XRD) and scanning electron microscope (SEM). The adsorption and inhibition action of acid corrosion of mild steel using cetyltrimethylammonium bromide (CTABr) and different halides (NaCl, NaBr and NaI) has shown synergetic effect. The results showed that the protection efficiency (P%) has high values at considerable high concentration of CTABr. However, in the presence of the different halides, the P increases dramatically at low concentration of CTABr. Physisorption was proposed from the the values of DG 0 ads . The synergism parameter (S h ) is found to be greater than unity indicating that the enhanced P% caused by the addition of the halides to the CTABr is due to a co-operative adsorption of both species. Corrosion products phases and surface morphology were studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively.
Study on the inhibition of Mild Steel Corrosion by Cationic Surfactant in HCl Medium
IOSR Journal of Applied Chemistry, 2012
The inhibition effect of N,N,N-trimethyldodecylammonium bromide(TDAB) as a cationic surfactant on the corrosion of mild steel in 1M HCl has been studied at different temperatures by weight loss, Tafel polarization and Electrochemical impedance spectroscopy. Morphology of the mild steel specimens were examined using scanning electron microscopy and AFM in presence and absence of inhibitor. The results show that TDAB is a good inhibitor, and the inhibition efficiency (IE) increases with the inhibitor concentration as well as increasing the temperature. The adsorption of inhibitor on the mild steel surface obeys the Langmuir adsorption isotherm equation. Polarization curves show that TDAB is a mixed-type inhibitor in hydrochloric acid. Activation parameters and thermodynamic parameters were also discussed. The results obtained from weight loss, polarizations and EIS are in good agreement.
The adsorption and inhibition effect of N,N,N-Tributyl-1-butanaminiuiodide(TBAI) on mild steel in 1M HCl at 298-328K was studied by potentiodynamic polarization, EIS and Atomic force microscopy techniques. The results showed that inhibition efficiency increases with inhibitor concentration. The adsorption of N,N,N-Tributyl-1-butanaminiuiodide on mild steel surface obeys Langmuir adsorption isotherm equation. Both thermodynamic (Enthalpy of adsorption ∆H ads , entropy of adsorption ∆S ads & free energy of adsorption ∆G ads) and kinetic parameter (Energy of activation E a, entropy of activation∆S 0 , enthalpy of activation∆H 0) were calculated and discussed. Polarization curves showed that the studied inhibitor acted as mixed type inhibitor.
Journal of Materials Science and Engineering with Advanced Technology
Electrochemically and weight loss measurements were carried out to study the effect of laboratory synthesized 1,4-dimethyl phenyl-N,N-dimethylanilinium dibromide salt (DMPMA) on the corrosion inhibition of mild steel in 1.0M HCl solution containing various concentrations () 3 − × at 303 K. The percentage of inhibition in the presence of this inhibitor decreased with temperature which indicating a physical adsorption was the predominant inhibition mechanism. This inhibitor will have application in industries, where hydrochloric acid solutions at elevated temperatures are used to remove scale and salts from steel surfaces, such as acid cleaning of tankage and pipeline, and may render dismantling unnecessary.