Investigation on 2-mercaptobenzothiazole behavior as corrosion inhibitor for 316-stainless steel in acidic media (original) (raw)
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Inhibition of stainless steel pitting corrosion in acidic medium by 2-mercaptobenzoxazole
Applied Surface Science, 2004
The corrosion behavior of stainless steel samples (304L and 316L) in HCl and H 2 SO 4 solution has been studied using potentiodynamic, cyclic voltammogram, EDX and scanning electron microscope (SEM) techniques. The inhibition characteristics of 2-mercaptobenzoxazole (MBO) on 316L stainless steel (316L SS) in HCl solutions were investigated at different temperatures (25, 40, 50 and 60 8C). MBO compound has proven to be efficient inhibitors for general and pitting corrosion of 316L SS in HCl solution. The inhibitive property of MBO may be argued to the formation of very low soluble bis-benzoxazolyl disulfide (BBOD) layer and a compact Fe-MBO complex film on the electrode surface. Some samples were examined by scanning electron microscope. The inhibition efficiencies increased with the increasing of MBO concentration but decreased with increasing temperature. The activation energy and thermodynamic parameters were calculated.
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
The effect of 2-Mercaptobenzothiazole on the corrosion rate of mild steel in 1.0M hydrochloric acid solution has been studied. The protection efficiency obtained by weight loss method at 20,30 and 40°C temperature using 100, 200 and 400ppm concentrations of the inhibitor. The investigated results showed that the inhibition efficiency increases with the increase in concentration of the inhibitor and decreases with the increase in temperature. The behaviour was found to be in good agreement with Scanning Electron Micrographs (SEM) analysis. The SEM analysis indicated that the metal surface was in a better condition in the presence of the Inhibitor as compared to the specimen exposed in the absence of the inhibitor. 2-Mercaptobenzothiazole acted as a very good corrosion inhibitor for mild steel in acidic medium.
Anti-Corrosion Methods and Materials, 2019
Purpose This paper aims to study the corrosion inhibition of Methyl 2-(benzamido)-2-(4-phenyl-1H-1,2,3-triazol-1-yl) acetate (MBPTA) and Methyl 2-(benzamido)-2-(4-p-tolyl-1H-1,2,3-triazol-1-yl) acetate (MBTTA) in 1 M H2SO4 solution at 25 °C. Design/methodology/approach The authors have used weight loss measurements, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, FT-IR, quantum chemical calculations and scanning electron microscopy (SEM) techniques. Findings The polarization measurements indicate that both compounds are mixed type inhibitors, and that MBTTA is more effective than MBPTA. The effect of temperature on the corrosion behavior using optimal concentration of MBTTA and MBPTA was studied in the temperature range 298-328 K. SEM was used to examine the morphology of the metal surface. Thermodynamic parameters were calculated and discussed. Monte Carlo simulations were applied to lookup for the most stalls configuration and adsorption energy for the ...
Anti-Corrosion Performance of 1,3-BENZOTHIAZOLE on 410 Martensitic Stainless Steel in H2SO4
Surface Review and Letters
The corrosion inhibition effect of synthesized 1,3-benzothiazole at very low concentrations on 410 martensitic stainless steel in 3[Formula: see text]MH2SO4 solution was studied through potentiodynamic polarization and weight loss measurements. The observation showed that the organic compound performed effectively with average inhibition efficiencies of 94% and 98% at the concentrations studied from both electrochemical methods due to the inhibition action of protonated inhibitor molecules in the acid solution. The amine and aromatics functional groups of the molecules active in the corrosion inhibition reaction were exposed from Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) spectroscopic analysis. Thermodynamic calculations showed cationic adsorption to be chemisorption adsorption, obeying the Langmuir adsorption isotherm. Images from optical microscopy showed an improved morphology in comparison to images from corroded stainless steel. Severe surf...
Corrosion Engineering Science and Technology, 2010
The efficiency of 4-Amino-5-phenyl-4H-1,2,4-triazole-3-thiol (APTT) as corrosion inhibitor for mild steel metal in 1?0M HCl has been investigated. Weight loss, direct current (potentiodynamic polarisation), alternating current (electrochemical impedance spectroscopy), change of open circuit potential (OCP) with immersion time and scanning electronic microscopy were used to study the effect of APTT on the corrosion inhibition of mild steel. Results obtained from weight loss, potentiodynamic polarisation, impedance measurements and change of OCP with immersion time are in good agreement and indicated that the inhibitive efficiency of the inhibitor increases with the rise of concentration. Polarisation curves show that APTT is a mixed type inhibitor. Results showed that APTT performed excellent inhibiting effect for the corrosion of mild steel in 1?0M HCl solution and inhibition efficiency is higher than 90% at 80610 25 M APTT. The high inhibition efficiency in terms of molecular adsorption and forming a protective film on the metal surface was discussed in this work. Adsorption of the inhibitor on the mild steel surface followed Langmuir adsorption isotherm and the value of the free energy of adsorption DG ads indicated that the adsorption of APTT molecule was a spontaneous process and was typical of chemisorptions. Surface photographs showed a good surface coverage on the metal surface.
The corrosion inhibition of type 304 austenitic stainless steel by 2-amino-5-ethyl-1, 3, 4-thiadiazole (TTD) compound and the electrochemical behaviour in dilute HCl solution were investigated through potentiodynamic polarization test, mass loss techniques and potential measurements. The results show that the organic derivative is highly effective with a maximum inhibition efficiency of 70.22% from mass loss analysis, while 74.2% is obtained from polarization tests. Observation of the scanning electron micrographs shows the absence of corrosion products due to electrochemical influence of TTD on the surface morphology of the steel. X-ray diffractometry reveals the absence of phase compounds and complexes on the steel samples after exposure. TTD adsorption on the steel surface obeys the Langmuir, Frumkin and Freundlich adsorption isotherms. Corrosion thermodynamic calculations reveal the inhibition mechanism occurs through chemisorption process and results from statistical analysis depict the strong influence of inhibitor concentration on the electrochemical performance of the TTD.
jmaterenvironsci.com
2-propargyl-5-p chlorophenyltetrazole (PCPT) was tested as corrosion inhibitor for mild steel in 1M HCl solution using electrochemical and weight loss measurements. Results obtained showed that this compound has a good inhibiting properties for mild steel corrosion in acidic medium, with inhibition efficiencies values reach 98% at 5×10-4 M. The inhibition was assumed to occur via adsorption of the PCPT molecules on metallic surface. Adsorption of inhibitor molecules on steel surface showed Langmuir adsorption isotherms fit in acidic media. Potentiodynamic polarization curves showed that the inhibition is a cathodic nature. In addition, results obtained by weight loss and electrochemical measurements are in good agreement. Mechanism of physical adsorption is proposed from the apparent activation energy (E a) and the thermodynamic parameters obtained. The adsorption of the PCPT on the mild steel surface is spontaneous.
Journal of Chemistry, 2014
The corrosion and corrosion inhibition of high strength low alloy (HSLA) steel after 10 min and 60 min immersion in 2.0 M H2SO4solution by 3-amino-1,2,4-triazole (ATA) were reported. Several electrochemical techniques along with scanning electron microscopy (SEM) and energy dispersive X-ray (EDS) were employed. Electrochemical impedance spectroscopy indicated that the increase of immersion time from 10 min to 60 min significantly decreased both the solution and polarization resistance for the steel in the sulfuric acid solution. The increase of immersion time increased the anodic, cathodic, and corrosion currents, while it decreased the polarization resistance as indicated by the potentiodynamic polarization measurements. The addition of 1.0 mM ATA remarkably decreased the corrosion of the steel and this effect was found to increase with increasing its concentration to 5.0 mM. SEM and EDS investigations confirmed that the inhibition of the HSLA steel in the 2.0 M H2SO4solutions is a...
2019
The corrosion inhibition by 5-(Phenyl)-4H-1,2,4-triazole-3-thiol (PTT) on mild steel in 0.5M H2SO4 solution has been investigated by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques at various concentrations and temperatures. The results obtained revealed that this compound performed excellently as corrosion inhibitor for mild steel in 0.5M H2SO4 solution. It was found that the inhibition efficiency increased with inhibitor concentration reached a maximum of 91.6 % at 0.5 mM. The addition of potassium iodide to PTT in solution increased the inhibition efficiency of this latter. A synergistic effect was observed between KI and inhibitor with optimum of concentration of 0.5 mM/PTT + 0.2% potassium iodide. Potentiodynamic polarization studies have shown that PTT inhibitor acts as a mixed-type inhibitor retarding the anodic and cathodic corrosion reactions with predominant effect on the cathodic reaction. Adsorption of inhibitor alone...
Electrochimica Acta, 2010
The effect of some mercapto functional azole compounds on the corrosion of mild steel in 1 M hydrochloric acid solution was studied by polarization and electrochemical impedance spectroscopy (EIS). Polarization studies showed depression of cathodic and anodic polarization curves in the presence of mercapto functional azole compounds, indicating mixed type corrosion inhibition of the compounds. Double layer capacitance and charge transfer resistance values were derived from EIS results. Changes in impedance parameters are indicative of adsorption of these compounds on the metal surface. Surface analysis SEM/EDX showing presence of sulfur on the surface confirmed the adsorption of the azole compounds on the mild steel surface as showed by electrochemical methods. Both compounds contain a pyridine-like nitrogen atom and a sulfur atom in their molecular structure, while they differ in only one heteroatom: oxygen in the oxazole ring and pyrrole-like nitrogen in the imidazole ring. The results of the electrochemical techniques revealed that changing the pyrrole like nitrogen atom to oxygen atom in the azole ring results in a decrease of corrosion inhibition performance in hydrochloric acid solution, which could be related to more negative charge on pyrrole-like nitrogen atom in comparison to oxygen atom as depicted by quantum chemical calculations.