Portugaliae Electrochimica Acta 25 (2007) 249-262 PORTUGALIAE ELECTROCHIMICA ACTA Corrosion Inhibition of Mild Steel by Using Cetyl Pyridinium Bromide (CPB (original) (raw)
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The corrosion inhibition of mild steel in one normal sulphuric acid solution by brij-30 has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic) techniques. The results were supplemented with scanning electron microscopy 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 is given. Adsorption of Brij-30 was found to follow the Langmuir's adsorption isotherm. Brij-30 is a mixed type of inhibitor.
The corrosion inhibition of mild steel in one normal sulphuric acid solution by PEGME has been studied in relation to the concentration of the inhibitor as well as the temperature using electrochemical polarization (galvanostatic and potentiostatic) techniques. The results were supplemented with scanning electron microscopy 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 is given. Adsorption of PEGME was found to follow the Langmuir's adsorption isotherm. PEGME 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.
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.
Inhibition of acid corrosion of steel using cetylpyridinium chloride
2003
The cationic surfactant cetylpyridinium chloride (CPC) showed high inhibition efficiency for the corrosion of low carbon steel in 1 M H 2 SO 4 . Electrochemical measurements were dedicated to test the performance of CPC at different concentrations and temperatures. CPC has a significant inhibiting effect on the corrosion of steel and protection efficiencies up to 97% were measured. The inhibitor shifted the corrosion potential in the cathodic direction. It was found that adsorption is consistent with the Bockris-Swinkels isotherm in the studied temperature range (30-60°C). The negative values of the free energy of adsorption and the decrease in apparent activation energy in the presence of the inhibitor suggest chemisorption of the CPC molecule on the steel surface.
Inhibition of corrosion of mild steel in acidic solutions by quarternary salts of pyridinium bases
Anti-Corrosion Methods and Materials, 1998
The influence of pyridinium chloride (PC) and n‐hexa decyl pyridinium chloride (HDPC) on the corrosion of mild steel in 5N HCl and 5N H2SO4 has been studied using techniques such as weight loss and gasometric measurements, potentiodynamic polarisation studies, linear polarisation studies and small amplitude cyclic voltametric studies. It is found that HDPC is more inhibitive than PC and both the compounds perform better in H2SO4. Polarisation studies reveal that PC behaves as an anodic inhibitor in H2SO4 and as a mixed inhibitor in HCl. Measurements of values of polarisation resistance (Rp) and double layer capacitance (Cdl) in the presence of these compounds also reveal the better performance of HDPC in both the acids. The adsorption of PC and HDPC on a mild steel surface from both the acids is found to obey Temkin’s adsorption isotherm.
Portugaliae Electrochimica Acta, 2009
The effect of phenylthiourea as a corrosion inhibitor for low carbon steel at different hydrochloric acid concentrations, different temperatures and fixed speed of electrode rotation, were addressed in this work. Polarization technique was used to evaluate the corrosion rates parameters. The corrosion rate of low carbon steel increases with temperature and follows Arrhenius equation in all acid concentrations in presence and absence of the inhibitor. Detailed thermodynamic parameters of activation (∆H act and ∆S act) for the corrosion reaction were obtained using nonlinear estimation method, while adsorption parameters (∆G ads , ∆H ads and ∆S ads) were obtained using graphical method. Maximum inhibitor efficiency was (96.44%) obtained at 1 M HCl at 333 K and 1 g/L inhibitor concentration.
Use of inhibitor is proven as an efficient and widely accepted corrosion prevention method. Corrosion control of steel is an important activity in technical, economic, environmental and safety terms. This article enumerates several types of inhibitors used to combat corrosion in acidic medium. In this paper, literature on corrosion inhibitors has been reviewed and discussions are made on properties and efficiency of inhibitors. (The prominent features of our work on the mechanism of corrosion inhibitors have been highlighted and in a few cases have tried to predict its mechanism).
The inhibitive action of pharmaceutically active compound on corrosion of carbon steel (CS) in 1.0 M HCl was studied by weight loss, potentiodynamic polarization and Electrochemical impedance spectroscopy techniques. Effect of temperature was investigated at temperature range (303-333 K). The obtained results indicate that the examined compound is an excellent inhibitor in 1.0 M HCl, and the inhibition efficiency (η %) increases with increasing the inhibitor concentration while it decreases with rising the temperature solution. Polarization curves show that the studied drug is mixed-type inhibitor in acidic medium. The adsorption of the inhibitor on the CS surface obeys the Langmuir adsorption isotherm. Thermodynamic parameters have been calculated and discussed. Surface analysis was performed to emphasis the inhibition efficiency of the studied drug 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 ...