Gravimetrical, theoretical, and surface morphological investigations of corrosion inhibition effect of 4-(benzoimidazole-2-yl) pyridine on mild steel in hydrochloric acid

Abstract

The corrosion inhibition efficiency of the novel pyridine namely, 4-(Benzoimidazole-2-yl)pyridine has been studied for mild steel in a 1 M hydrochloric acid environment by utilizing gravimetrical techniques. The synthesized inhibitor exhibits a significant inhibitive efficiency of 93.8% at 0.005 M. The adsorption isotherm of the investigated inhibitor on mild steel surface obeys the Langmuir isotherm. Surface morphology investigated by utilizing scanning electron microscopy (SEM) demonstrates a smooth metal surface with the addition of 4-(Benzoimidazole-2-yl)pyridine in a hydrochloric acid environment. Quantum chemical calculations using density functional theory (DFT) have been used to investigate the molecular structure and behavior of 4-(Benzoimidazole-2-yl) pyridine as a corrosion inhibitor. Different parameters have been calculated using DFT, such as energies of highest occupied molecular orbital and lowest occupied molecular orbital (EHOMO and ELUMO), energy gap (∆E), and dipole moment (μ). These parameters were important to elucidate the behavior of the investigated molecule as a corrosion inhibitor in acidic solution and also suggest the mechanism of inhibition.

A combined experimental and theoretical study of a novel corrosion inhibitor derived from thiophen

“…Figure 10 stands as a graphical representation of the inhibition efficiencies of various synthesized organic corrosion inhibitors, [7,8,[12][13][14][15][16][17][18][22][23][24][25][26][27]40,41,[45][46][47][48]55,[82][83][84][85][86][87][88][89][90][91] placed in juxtaposition with the newly synthesized 2-(1-(2,5dimethylthiophen-3-yl)ethylidene)hydrazinecarbothioamide. Each inhibitor is distinctly identified, facilitating easy cross-referencing.…”

“…The comprehensive evaluation and comparison of synthesized organic corrosion inhibitors hold paramount importance in the quest for identifying optimal solutions for corrosion protection. This section is dedicated to a meticulous comparative study encompassing a range of published inhibitors, [7,8,[12][13][14][15][16][17][18][22][23][24][25][26][27]40,41,[45][46][47][48]55,[82][83][84][85][86][87][88][89][90][91] centered around their inhibition efficiencies. The visualization in Figure 10 portrays the spectrum of inhibition efficiencies exhibited by these synthesized inhibitors, unraveling the nuances in their performance.…”

“…By discerning inhibitors that exhibit superior inhibitory attributes, this analysis serves as an invaluable guide for the curation and advancement of impactful organic corrosion inhibitors. This discernment empowers researchers to concentrate their endeavors on inhibitors with substantiated promise, thereby elevating the prospect of successful In summation, the comparative expedition juxtaposing 2-(1-(2,5-dimethylthiophen-3-yl)ethylidene) hydrazinecarbothioamide with a spectrum of synthesized organic corrosion inhibitors, [7,8,[12][13][14][15][16][17][18][22][23][24][25][26][27]40,41,[45][46][47][48]55,[82][83][84][85][86][87][88][89][90][91] artfully depicted in Figure 10, unfurls a panorama of inhibition efficiencies. Through the discernment of varied inhibitory performances, comparative analysis bestows the gift of informed selection upon researchers and engineers.…”

“…In tests involving the loss of metallic coupon mass in both inhibited and uninhibited acidic media, it was evident that the presence of the thiophen derivative, functioning as a corrosion inhibitor, shielded the mild steel from the HCl. [42][43][44][45][46][47][48][49] The composition and molecular chemical structures of the thiophen derivative play pivotal roles in its corrosion prevention ability. The inclusion of hetero-atoms, notably aromatic rings, facilitates robust interactions between the thiophen derivative and metal surfaces, rendering it an effective corrosion inhibitor.…”

“…In summation, the comparative expedition juxtaposing 2‐(1‐(2,5‐dimethylthiophen‐3‐yl)ethylidene)hydrazinecarbothioamide with a spectrum of synthesized organic corrosion inhibitors, [ 7,8,12–18,22–27,40,41,45–48,55,82–91 ] artfully depicted in Figure 10, unfurls a panorama of inhibition efficiencies. Through the discernment of varied inhibitory performances, comparative analysis bestows the gift of informed selection upon researchers and engineers.…”