“…By plotting ln K ads versus T −1 , as shown in Fig. 8 , a straight line is obtained, which follows the van’t Hoff equation 19 : where and are change in the entropy and standard enthalpy of adsorption, respectively. Figure 8 ln K ads vs. T −1 for the LHP at the MS surface in 5 M HCl.…”
Section: Resultsmentioning
confidence: 96%
“…The environmental and safety concerns related to corrosion inhibition processes have encouraged researchers to explore alternatives that are eco-friendly and offer acceptable inhibition efficiency, especially in acidizing treatment processes, which cost the state of Qatar, in addition to chemical treatment applications, a direct expenditure close to 8 billion USD per year 18 . Therefore, focus on natural and nature-based products is increased to produce so-called “green inhibitors” 19 – 22 . However, the harsh acidic and high-temperature environments during drilling and stimulation processes in the oil and gas wells limit the full utilization of such green corrosion inhibitors.…”
Laurhydrazide N′-propan-3-one was used as an eco-friendly inhibitor for the corrosion of mild steel in 5 M HCl at elevated temperatures. Various electrochemical techniques and surface characterization methods were utilized in this study. In addition, the kinetics and thermodynamic parameters were calculated and discussed. Furthermore, a geometry optimization of LHP was performed and the time-dependent density functional theory was utilized to calculate the electronic absorption spectra. Finally, frequency calculations were, also, performed on the optimized geometry.
“…By plotting ln K ads versus T −1 , as shown in Fig. 8 , a straight line is obtained, which follows the van’t Hoff equation 19 : where and are change in the entropy and standard enthalpy of adsorption, respectively. Figure 8 ln K ads vs. T −1 for the LHP at the MS surface in 5 M HCl.…”
Section: Resultsmentioning
confidence: 96%
“…The environmental and safety concerns related to corrosion inhibition processes have encouraged researchers to explore alternatives that are eco-friendly and offer acceptable inhibition efficiency, especially in acidizing treatment processes, which cost the state of Qatar, in addition to chemical treatment applications, a direct expenditure close to 8 billion USD per year 18 . Therefore, focus on natural and nature-based products is increased to produce so-called “green inhibitors” 19 – 22 . However, the harsh acidic and high-temperature environments during drilling and stimulation processes in the oil and gas wells limit the full utilization of such green corrosion inhibitors.…”
Laurhydrazide N′-propan-3-one was used as an eco-friendly inhibitor for the corrosion of mild steel in 5 M HCl at elevated temperatures. Various electrochemical techniques and surface characterization methods were utilized in this study. In addition, the kinetics and thermodynamic parameters were calculated and discussed. Furthermore, a geometry optimization of LHP was performed and the time-dependent density functional theory was utilized to calculate the electronic absorption spectra. Finally, frequency calculations were, also, performed on the optimized geometry.
“…The concept of improving corrosion resistance of steel by the formation of a surface layer that efficiently blocks corrosive components from surrounding medium, is self-explanatory, and has also previously been proposed in for steel corrosion in hot tapwater. 35,36 The brown-orange colour of rust in the system without inhibitor indicates that its main component is lepidocrocite (γ-FeOOH). 37 On the inhibitor protected electrode, a dark violet layer is visible, proving formation of ferric tannate.…”
The ubiquitous use of plain and low-alloy steels in neutral, chloride bearing environments presents an everyday challenge for corrosion protection professionals. This paper explores the possibility of developing a non-toxic and environmentally friendly synergistic inhibitor mixture made of propolis, tannin, sodium benzoate, PEG400 and starch that could be applied into the solution to induce the formation of a persistent protective layer on steel. Components of the mixture were chosen based on the references giving their characteristics relevant to their possible action in the solution and/or at the surface of the steel. The efficiency of the protective layer formed under the influence of the inhibitor mixture, and then measured by the LPR probe in the inhibitor-free solution, was the lowest under quiescent conditions (75%) and the highest (95%) under flow conditions. Both, LPR and EIS data indicate that the inhibitor modified layer presents a barrier for diffusion of oxygen that acts as a primary corrosion reaction depolarizer in the investigated neutral chloride solution. The demonstrated persistence of the inhibitor modified layer is of primary interest as it gives possibility batch application.
“…The ionization energy and the electronic affinity were determined by the values of the energies of the HOMO and LUMO orbital using the following Eqs. (5) and (6) [26]:…”
Section: Dft Calculationsmentioning
confidence: 99%
“…Basically, the most popular steel used by companies is the mild steel; it is also usually the cheapest option, making it a great choice for industrial projects [1][2][3][4][5]. That's why it is easily exposed to the phenomenon of the corrosion due to the use of the acid solutions (HCl and H 2 SO 4 ) in several industrial processes such as cleaning and descaling [6].…”
The inhibition efficiency of 1,5-Diaminonaphthalene (1,5DNA) compound was studied by itself as well as in a mixture that included sodium chloride (NaCl), noted [1.5DNA][Cl − ], for mild steel in 0.5 M sulfuric acid. Gravimetric, electrochemical techniques and computational chemistry calculations were utilized for the assessment of corrosion inhibition efficiency and explanation of the mechanism involved during the corrosion inhibition process. The results show that inhibition efficiencies on mild steel increase with increase in concentration of the inhibitor and enhancement in inhibition efficiency was observed on addition of sodium chloride due to synergism. This inhibition has been attributed to the stabilization of adsorbed inhibitor film and, consequently, increasing its inhibitive properties. The [1.5DNA][Cl − ] acts as mixed type inhibitor and the Nyquist curves show that with the increase in the concentration, the charge transfer resistance R ct increased. In addition, [1.5DNA][Cl − ] obeyed Langmuir monolayer adsorption isotherm. Moreover, Molecular Dynamic Simulations and DFT calculations showed that [1.5DNA][Cl − ] owned a higher adsorption ability.
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