The synergistic inhibition behaviour of tannic acid and iodide ions on mild steel in H 2 SO 4 solutions

A new series of N‐alkyl‐N,N‐dimethyl‐N‐(3‐thienylmethylene)ammonium bromides (designated as NTA‐n, n = 8, 10, 12, 14, and 16) were synthesized. The electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization showed that NTA‐n could protect availably X70 steel from attack of HCl with an inhibition efficiency of about 95%. And the inhibition ability follows the following sequence: NTA‐8 < NTA‐10 < NTA‐12 < NTA‐14 < NTA‐16, suggesting that prolonging alkyl chain may enhance the inhibition capacity of the molecules. Theoretical investigation backs up well the experiment results. The correlation of theoretical calculation with the experiment results illustrated clearly double logarithmic relations between the corrosion current and the computed quantum chemical parameters such as the highest occupied molecular orbital energy ( E HOMO), energy gap (ΔE), molecular volume ( ν), electronegativity ( χ), the total energy of iron crystal with the adsorbed inhibitor molecule ( E total), the interaction energy of Fe (1 0 0) surface and inhibitor molecules ( E inhibitor), while an equation resembling Hammet relation was existed between the corrosion currents and the fraction of electrons transfer (ΔN). These linear correlations suggest the relation of the inhibitor structure with its inhibition activity: long alkyl chain and electron donating groups in NTA‐n will enhance the corrosion efficiency.

show abstract

“…PA). The inhibition efficiency was calculated using the following equation:

η % = \frac{R_{ct} ‐ R_{ct}^{0}}{R_{ct}} \times 100,

where

R_{ct}^{0}

and

R_{ct}

are charge–transfer resistance in the absence and presence of different concentration of inhibitors, respectively.…”

Section: Experimental Methodsmentioning

confidence: 99%

New surfactants N‐alkyl‐N,N‐dimethyl‐N‐(3‐thienylmethylene)ammonium bromides: Preparation and anticorrosion evaluation

Chen

Jiang

Cheng

et al. 2019

Materials & Corrosion

View full text Add to dashboard Cite

show abstract

“…In an acidic solution, the corrosion rate is related to the temperature according to the Arrhenius equation, according to which, the logarithm of the corrosion rate (log CR) is a linear function with 1/T [16,18]: (6) where CR is the corrosion rate, Ea is the activation energy (kJ/mol), A is the Arrhenius constant, R is the molar gas constant and T is the absolute temperature (K). The activation energy was determined using the slopes of log CR versus the 1/T graph depicted in Figure 2.…”

Section: Kinetics and Thermodynamic Studiesmentioning

confidence: 99%

“…acid cleaning, acid descaling, acid pickling and oil-well acidizing), which requires corrosion inhibitors that aim to withstand corrosion on metal materials [2]. The use of biocorrosion inhibitors continues to be developed bined with other inhibitors for mild steel in acidic solutions [6][7][8]. The addition of halide ions to sulphuric acid solutions containing organic inhibitors has been found to stabilize organic cation adsorption, which leads to an increase in inhibition efficiency.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Corrosion Inhibition Effect of Rice Husk Extract and KI for Mild Steel in H2SO4 Solution

Pramudita

Sukirno

Nasikin

2019

Bull. Chem. React. Eng. Catal.

View full text Add to dashboard Cite

The corrosion inhibition of rice husk extract for bio-corrosion in mild steel in 1 M of H2SO4 solution and the effect of adding potassium iodide were investigated using the weight-loss method with a variable solution temperature and various bio-inhibitor concentrations. The addition of potassium iodide can significantly increase the efficiency of rice husk extract. The highest efficiency is 95.89% at 1,250 ppm of inhibitor concentration at a temperature of 313 K. The inhibition efficiency of rice husk extract is synergistically increased with the addition of potassium iodide. The characteristics of the adsorption inhibitors were assessed using the Langmuir isotherm adsorption approach at all studied concentrations and temperatures. The synergy of rice husk extract and potassium iodide was examined using thermodynamic and kinetic parameters.because it has the advantage of being biodegradable and does not contain heavy metals or other toxic compounds.Rice husk is considered one of the most important agricultural wastes, and a great amount of research has been conducted on its use in various fields. It has a high silica content, which is a good advantage, especially for bio-corrosion inhibitors [3]. Rice husk extract (RHE) has the potential to be developed into a bio-corrosion inhibitor [4,5] and contains amorphous silica, which is safe and environmentally friendly.Recently, researchers have been paying more attention to mixed inhibitors because of their synergistic effects. The effect of the inhibitor mixture is better than the single inhibitor effect. Further, several authors have reported that halide (Iˉ) ions, which are known to stimulate and inhibit corrosion in acid solutions, can provide their own effective protection or can be com-

show abstract

“…The use of CPE instead a pure capacitor introduces non-ideal dielectric behaviour for the inhomogeneous electrode surface. 38,39 The obtained impedance parameters including charge transfer resistance (R ct ), lm resistance (R f ), Warburg impedance (W), C dl , C f , and so on are summarized in Table 2. The C dl and C f values are calculated as follows, 40…”

Section: Eis Measurementsmentioning

confidence: 99%

Halogeno-substituted indazoles against copper corrosion in industrial pickling process: a combined electrochemical, morphological and theoretical approach

et al. 2018

View full text Add to dashboard Cite

show abstract

The synergistic inhibition behaviour of tannic acid and iodide ions on mild steel in H 2 SO 4 solutions

Cited by 45 publications

References 47 publications

New surfactants N‐alkyl‐N,N‐dimethyl‐N‐(3‐thienylmethylene)ammonium bromides: Preparation and anticorrosion evaluation

New surfactants N‐alkyl‐N,N‐dimethyl‐N‐(3‐thienylmethylene)ammonium bromides: Preparation and anticorrosion evaluation

Synergistic Corrosion Inhibition Effect of Rice Husk Extract and KI for Mild Steel in H2SO4 Solution

Halogeno-substituted indazoles against copper corrosion in industrial pickling process: a combined electrochemical, morphological and theoretical approach

Contact Info

Product

Resources

About