Corrosion inhibition efficiency and adsorption characteristics of some Schiff bases at mild steel/hydrochloric acid interface

Kumar, C.B. Pradeep; Mohana, K. N.

doi:10.1016/j.jtice.2013.08.017

Cited by 65 publications

(24 citation statements)

References 26 publications

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“…3 and Table 2 that, the addition of both EAE and BE to the acid solution causes a remarkable decrease in the corrosion rate predominantly shifts the cathodic curves to lower values of current densities; it may be due to the adsorption of organic compounds present in the extracts at the active sites of CS surface, retarding both metallic dissolution and hydrogen evolution reactions and consequently slowed down the corrosion process [25]. The structure and functional groups of the inhibitors play prominent roles during the adsorption process [1]. Inspection of Table 2 showed that both anodic and cathodic Tafel slopes do not change remarkably upon addition of EAE and BE, which indicates that the extracts act as a mixed type inhibitor for the corrosion of C steel.…”

Section: Potentiodynamic Polarization Curvesmentioning

confidence: 98%

“…The increase in R p values can be attributed to the adsorption of the inhibitors on the metal surface leading to the formation of protective film on the metal surface and thus decreases the extent of the dissolution reaction [24]. The decrease in the C dl values may be due to the increase in the thickness of the electric double layer [1]. The inhibition efficiency (g p %) was achieved at (60 %) and (80 %) for EAE and BE, respectively.…”

Section: Weight Loss Measurementsmentioning

confidence: 99%

“…7) and shown in Table 8. It can be seen in the Table 8 that E a is higher in the presence of the inhibitors than in their absence and increased with the increase in concentration of EAE and BE, which indicate a strong adsorption of the inhibitor molecules at the CS surface [1]. An alternative form of Arrhenius equation is the transition-state equation [38,39]:…”

Section: Effect Of the Temperaturementioning

confidence: 99%

“…Metallic structures are exposed to conditions that facilitate corrosion processes. Furthermore, hydrochloric and sulfuric acids are widely used for pickling and de-scaling of carbon steel which promote the acceleration of metallic corrosion, causing ecological risks and economic consequences in term of repair, replacement and product losses [1]. Therefore, the prevention of the corrosion is vital not only for the protection of metals but also in decreasing the dispersion of the toxic compounds into the environment [2].…”

Section: Introductionmentioning

confidence: 99%

“…Organic compounds having functional groups such as -OR, -COOH, -SR and/or NR 2 have been reported to inhibit corrosion of metals in acid solutions [4]. The presence of oxygen, sulfur, nitrogen atoms and multiple bonds in organic compounds enhances their adsorption ability and corrosion inhibition efficiency [1]. However, most of these compounds are expensive, toxic and not biodegradable [5].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion inhibition of carbon steel in 1 M H2SO4 solution by Thapsia villosa extracts

et al. 2016

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Ethyl acetate extract (EAE) and butanolic extract (BE) of Thapsia villosa were investigated as corrosion inhibitors of Carbon Steel (CS) in 1 M H 2 SO 4 using electrochemical impedance spectroscopy (EIS) techniques, potentiodynamic polarization and weight loss measurements. The effect of temperature on the corrosion behavior of CS was studied in the range of 20-40°C. The experimental results show that EAE and BE are good corrosion inhibitors and the protection efficiency increased with increasing concentration of the extracts, but decrease with rise in temperature. The EAE and BE act as a mixed types inhibitors. The adsorption of extracts on CS surface follow Langmuir isotherm. The apparent energies, enthalpies and entropies of the dissolution process were discussed.

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Section: Potentiodynamic Polarization Curvesmentioning

confidence: 98%

Section: Weight Loss Measurementsmentioning

confidence: 99%

Section: Effect Of the Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion inhibition of carbon steel in 1 M H2SO4 solution by Thapsia villosa extracts

et al. 2016

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Nitrogen/Sulfur Co‐Doped Carbon Dots for Enhancing Anti‐Corrosion Performance of Mg Alloy in NaCl Solution

Liang

Wang

et al. 2021

ChemistrySelect

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To reduce the corrosion of Mg alloy, an environment-friendly Nitrogen/Sulfur co-doped carbon dots (N/S-CDs) was prepared using thiourea and 4-amino salicylic acid as precursors. The corrosion inhibition behavior of N/S-CDs for Mg alloy in 3.5 wt.% NaCl solution was systematically investigated by electrochemical measurements. The results shown that N/S-CDs could suppress the corrosion of Mg alloy and the inhibition efficiency reached 86.6 % at 50 mg L À 1 . The low energy gap (0.156 eV) and high dipole moment (11.19 D) indicated that N/ S-CDs has a strong chemical adsorption on Mg by quantum chemistry calculation. Meanwhile, the adsorption process is conformed to the Langmuir adsorption isotherm, belonging to the physical/chemical mixed adsorption.

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Synthesis, Characterization and Corrosion Inhibition Studies of 2-Methylbenzoylthiourea Derivatives

2015

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The effect of new corrosion inhibitors, namely N-(2-methoxyphenyl)-N'-(2-methylbenzoyl) thiourea (A1). N-(3-methoxyphenyl)-N'-(2-methylbenzoyl) thiourea (A2), N-(4-methoxyphenyl)-N'-(2-methylbenzoyl)thiourea (A3) and N-(2-methylbenzoyl)-N'-phenylthiourea (A4) on mild steel in 1.0 M H 2 SO 4 with variation concentrations of inhibitors: 1 × 10 −5 , 1 × 10 −4 and 1 × 10 −3 M was tested by using weight loss method and linear polarization resistance (LPR) technique. These compounds were characterized using elemental analyser, FTIR, 1 H and 13 C NMR spectroscopy. Result obtained for IR showed the important bands of thiourea compound such as ν(N-H), ν(C=O), ν(C-N) and ν(C=S) which were observed around 3200, 1670, 1250 and 700 cm −1 . The 1 H chemical shifts for CONH and CSNH had been observed around 11 and 12 ppm respectively. For the 13 C resonance, the signal of C=O and C=S had been observed at 180 and 206 ppm. The presence of the inhibitors significantly reduced the corrosion rate of the mild steel. The most promising inhibitors action is at 1 × 10 −3 M and was achieved by compound A1 where the inhibition efficiency is 82.4-86.2 %. The effectiveness of the compounds was affected by the presence and absence of methoxy as the substituents in the compounds.

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Corrosion inhibition efficiency and adsorption characteristics of some Schiff bases at mild steel/hydrochloric acid interface

Cited by 65 publications

References 26 publications

Corrosion inhibition of carbon steel in 1 M H2SO4 solution by Thapsia villosa extracts

Corrosion inhibition of carbon steel in 1 M H2SO4 solution by Thapsia villosa extracts

Nitrogen/Sulfur Co‐Doped Carbon Dots for Enhancing Anti‐Corrosion Performance of Mg Alloy in NaCl Solution

Synthesis, Characterization and Corrosion Inhibition Studies of 2-Methylbenzoylthiourea Derivatives

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