Inhibitive Efficiency of some Substituted Thioureas for the Corrosion of Aluminium in Nitric Acid

Singh, D. K.; Chaudhary, R. S.; Prakash, Bhanu; Agrawal, Chitranjan

doi:10.1179/000705979798358571

Cited by 41 publications

(13 citation statements)

References 4 publications

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“…The influence of temperature on the inhibition process is a complex phenomenon because of the numerous competing factors that affect the kinetics of inhibitor adsorption/desorption, electrochemical reactions, and diffusion of the reactive species. For example, rise in temperature may alter the chemical behavior of inhibitor molecules such that the electron densities at the centers of the molecules increase and improves molecular adsorption 42 . Also, the inhibitor itself may undergo decomposition and/or rearrangement 43 and this could have serious influence on the inhibition efficiency.…”

Section: Resultsmentioning

confidence: 99%

Eco-friendly 2-Thiobarbituric acid as a corrosion inhibitor for API 5L X60 steel in simulated sweet oilfield environment: Electrochemical and surface analysis studies

Usman

Gasem

Umoren

et al. 2019

Sci Rep

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The corrosion inhibition efficiency of 2-Thiobarbituric acid (TBA) for metal substrate (API X60 steel) in 3.5% NaCl solution saturated with CO2 gas was probed using various techniques namely, LPR (linear polarization resistance), EIS (electrochemical impedance spectroscopy), and PDP (potentiodynamic polarization). The effects of TBA concentration (25–100 ppm), solution pH (4 and 6), temperature (25–80 °C), and immersion time (2–72 h) on the inhibition efficiency were examined. SEM (scanning electron microscopy) and XPS (X–ray photoelectron spectroscopy) were deployed to explore the corrosion retardation mechanism. TBA exhibited protection efficiencies exceeding 90% for all experimental conditions considered. The excellent anticorrosion performance by TBA was retained up to 72 hours of immersion time. PDP results exhibited that TBA behaved as a mixed type inhibitor. Results from kinetics and thermodynamics analyses indicate that TBA chemically adsorbed on the steel surface following Langmuir isotherm model. The composition of the adsorbed TBA film has been analyzed by XPS.

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Section: Resultsmentioning

confidence: 99%

Eco-friendly 2-Thiobarbituric acid as a corrosion inhibitor for API 5L X60 steel in simulated sweet oilfield environment: Electrochemical and surface analysis studies

Usman

Gasem

Umoren

et al. 2019

Sci Rep

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“…The slopes of these plots are however, not unity as expected from the absorption isotherm equation, rather vary between 1.1 for 2-6 dimethyl pyridine to 2.89 for pyridine. This type of deviation has been reported in the literature and is attributed to the mutual interaction of the absorbed molecules and also co-absorption of other species present in the solution 20 . The presence of highly surface active anions like S 2-and HS -which are formed due to the ionization of H 2 S in the solution, perhaps also contribute to this factor.…”

Section: Absorption Isothermmentioning

confidence: 90%

H2S Corrosion control of steel by using pyridine compounds

Chatterjee

Singh

1991

Anti-Corrosion Methods and Materials

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Pyridine and some of its derivatives have been evaluated as inhibitors for the corrosion of API‐45 steel in NACE sour solution. Amongst the various methyl and halogen substituted pyridine compounds, 2,4,6‐trimethyl pyridine is found to afford maximum protection followed by 2,6‐dimethyl pyridine, >2,4‐dimethyl pyridine, >3‐bromopyridine, >2‐methyl pyridine, 4‐methyl pyridine, 3,5‐dimethyl pyridine, >2 and 3‐chloropyridine>pyridine. These results have been discussed in the light of availability of the electron densities with the nitrogen atom of the pyridine ring. The inhibitive periormance of all the inhibitors is found to deteriorate with increase in temperature from 30 to 60°C and with passage of time. The values of heat of absorption and free energy of absorption indicates that the inhibitors have a chemical type of absorption at the metal/electrolyte interface. Polarization diagrams and shift in open circuit potential in the presence of inhibitors indicate that these compounds retard the cathodic as well as anodic reaction process.

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“…So, the decrease of E a in the case of PT and MO-PT probably was attributed to chemisorption of these inhibitors molecules on the mild steel surface (Venkatachalam et al 1981;Sankarapapavinasam et al 1991). In this context, Singh et al (1979) have considered that the increase in temperature caused an increase in the electron density at the adsorption centers, which improved the inhibition efficiency. The same results were obtained in the case of inhibition of galvanized steel in 3.0% NaCl (Azaroual et al 2016).…”

Section: Effect Of Temperaturementioning

confidence: 99%

Corrosion inhibition studies for mild steel in 5.0 M HCl by substituted phenyltetrazole

Kacimi

Azaroual²,

Touir

et al. 2017

Euro-Mediterr J Environ Integr

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The inhibition efficiency of three substituted phenyltetrazole compounds, namely 5-(4-chlorophenyl)-1H-tetrazole (Cl-PT), 5-(4-methoxyphenyl)-1H-tetrazole (MO-PT), and 5-phenyl-1H-tetrazole (PT), for mild steel corrosion in 5.0 M HCl solution was\ investigated using weight loss measurements and electrochemical study. It is showed that these compounds are good inhibitors for mild steel corrosion in 5.0 M HCl solution which act as cathodic type inhibitors. So, the inhibition efficiency was increased with inhibitor concentration in the order of Cl-PT [ MO-PT [ PT which depended on their molecular structures. It is found also that these compounds toke its performance at different temperatures range from 298 to 328 K. In addition, the thermodynamic adsorption parameters at different concentrations were investigated and discussed. Finally, it is seen that the inhibition efficiency of the studied compounds increased with immersion time to reach a maximum at 12 h.

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Inhibitive Efficiency of some Substituted Thioureas for the Corrosion of Aluminium in Nitric Acid

Cited by 41 publications

References 4 publications

Eco-friendly 2-Thiobarbituric acid as a corrosion inhibitor for API 5L X60 steel in simulated sweet oilfield environment: Electrochemical and surface analysis studies

Eco-friendly 2-Thiobarbituric acid as a corrosion inhibitor for API 5L X60 steel in simulated sweet oilfield environment: Electrochemical and surface analysis studies

H2S Corrosion control of steel by using pyridine compounds

Corrosion inhibition studies for mild steel in 5.0 M HCl by substituted phenyltetrazole

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