“…5 , ∆S * is calculated from the intercept (log (R/Nh) + ∆S * /2.303R) while ∆H * is calculated from the slope (− ∆H * /2.303R). As recorded in Table 3 , the positive values of activated enthalpy indicate the endothermic dissolution process 45 , whereas the negative sign of activated entropy assumes that the formation of activated complex is promoted by the reduction in disordering and more tending in the direction of association rather than dissociation in the rate determining step 46 , 47 . Figure 4 Arrhenius plots of the dissolution of C-steel in 1.0 M HCl with absence and presence of several doses of inhibitors MA-1440 and MA-1456.…”
The inhibition efficiency and adsorption affinity were investigated for two novel compounds, namely: 6-methoxy-2-naphthyl-[2, 2’-bithiophene]-5-carboxamidine hydrochloride salt (MA-1440) and 5'-(4-chlorophenyl)-2, 2’-bifuran-5-carboxamidine hydrochloride salt (MA-1456). The inhibition study was conducted on carbon steel surface in 1.0 M HCl with different inhibitor doses and different temperature levels, to investigate the optimum dose and preferable temperature. The performed investigation included chemical, electrochemical, instrumental, and quantum computation techniques. A chemical technique was accomplished by using weight-loss measurements. Different factors were studied using weight-loss measurements in order to reach the maximum inhibition efficiency. The adsorption study revealed that the examined inhibitors obey the Langmuir adsorption isotherm and are chemically adsorbed on the steel surface. The electrochemical measurements were accomplished through the electrochemical impedance (EIS) and potentiodynamic polarization (PDP) techniques. Based on the electrochemical measurements, the examined compounds were categorized as mixed inhibitors. The instrumental examination using different techniques namely: scanning electron microscope (SEM), energy dispersive X-ray (EDX), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) confirmed that the considered inhibitors are excellently adsorbed over the carbon steel surface. The extent of the adsorption affinity of these compounds on the carbon steel surface was studied theoretically using quantum computations and Monte Carlo simulation. The theoretical investigation results of quantum chemistry were validated with those obtained by chemical and electrochemical methodologies. All investigations prove that, the tested compounds were adsorbed chemically on the steel surface and achieved maximum inhibition efficiency of, 94.69% and 90.85% for M-1440 and MA-1456, respectively, at the optimum concentration 30 $$\times$$
×
10–6 mol L−1 and temperature 328 K.
“…5 , ∆S * is calculated from the intercept (log (R/Nh) + ∆S * /2.303R) while ∆H * is calculated from the slope (− ∆H * /2.303R). As recorded in Table 3 , the positive values of activated enthalpy indicate the endothermic dissolution process 45 , whereas the negative sign of activated entropy assumes that the formation of activated complex is promoted by the reduction in disordering and more tending in the direction of association rather than dissociation in the rate determining step 46 , 47 . Figure 4 Arrhenius plots of the dissolution of C-steel in 1.0 M HCl with absence and presence of several doses of inhibitors MA-1440 and MA-1456.…”
The inhibition efficiency and adsorption affinity were investigated for two novel compounds, namely: 6-methoxy-2-naphthyl-[2, 2’-bithiophene]-5-carboxamidine hydrochloride salt (MA-1440) and 5'-(4-chlorophenyl)-2, 2’-bifuran-5-carboxamidine hydrochloride salt (MA-1456). The inhibition study was conducted on carbon steel surface in 1.0 M HCl with different inhibitor doses and different temperature levels, to investigate the optimum dose and preferable temperature. The performed investigation included chemical, electrochemical, instrumental, and quantum computation techniques. A chemical technique was accomplished by using weight-loss measurements. Different factors were studied using weight-loss measurements in order to reach the maximum inhibition efficiency. The adsorption study revealed that the examined inhibitors obey the Langmuir adsorption isotherm and are chemically adsorbed on the steel surface. The electrochemical measurements were accomplished through the electrochemical impedance (EIS) and potentiodynamic polarization (PDP) techniques. Based on the electrochemical measurements, the examined compounds were categorized as mixed inhibitors. The instrumental examination using different techniques namely: scanning electron microscope (SEM), energy dispersive X-ray (EDX), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) confirmed that the considered inhibitors are excellently adsorbed over the carbon steel surface. The extent of the adsorption affinity of these compounds on the carbon steel surface was studied theoretically using quantum computations and Monte Carlo simulation. The theoretical investigation results of quantum chemistry were validated with those obtained by chemical and electrochemical methodologies. All investigations prove that, the tested compounds were adsorbed chemically on the steel surface and achieved maximum inhibition efficiency of, 94.69% and 90.85% for M-1440 and MA-1456, respectively, at the optimum concentration 30 $$\times$$
×
10–6 mol L−1 and temperature 328 K.
“…However, despite their considerable potential, there remains a lack of comprehensive reports on using surfactants for corrosion prevention across various electrolytes, waranting further exploration in this promising domain. The latest research has been conducted on the inhibition potential of novel cationic Gemini surfactants, [722][723][724][725] zwitterionic surfactants, 726 tera-cationic surfactants, 727 and Quaternium-22 728 for metallic materials in different media using different advanced testing techniques.…”
Section: Green Corrosion Inhibition Using Safer Chemicals (Ils Biodeg...mentioning
Given the high toxicity of inorganic inhibitors, organic substances, primarily heterocycles, have proven to be one of the most efficient, cost-efficient, and practical alternatives. The severe limitations of using organic...
“…A literature study suggests that a very few number of reports are available on the anticorrosive effect of covalently functionalised CNTs on metallic corrosion in aqueous electrolytes [65,66]. This opens a very hot and interesting area of corrosion study to be explored.…”
Section: Covalent Functionalisation Of Nanomaterialsmentioning
Nanotechnology is a branch of science and engineering that involves the synthesis, modification, characterisation and application of nanoscale materials in diverse fields. They provide excellent surface coverage and are successfully used as corrosion inhibitors. However, most of the nanomaterials are not effective and require special treatments or modifications for proper anticorrosive activities. The present review article features the current approaches and practices that have been adopted to enhance the anticorrosive performance of nanoscale materials. One of the most growing interests in this direction is the use of covalently and non-covalently functionalised nanomaterials. The functionalised nanomaterials show remarkable improvement in corrosion protection performance. The covalently functionalised nanomaterials show better dispersibility and thereby better efficiency in aqueous electrolytes. In the anticorrosive formulations, nanomaterials avoid the penetration of corrosive species and thereby increase durability and corrosion inhibition. The nanomaterials in anticorrosive formulations also enhance weathering resistance, UV resistance, mechanical performance, thermal stability and hydrophobic property.
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