Experimental and Theoretical Studies on Synthesized Compounds as Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Solution

Abstract

Imidazole derivatives, namely, 1-((1-(piperazinomethyl)-1H-benzoimidazol-2-yl)methyl)-2-phenylhydrazine (PBIP), and 1-((1-(morpholinomethyl)-1H-benzoimidazol-2-yl)methyl)-2-phenylhydrazine (MBIP) were synthesized and investigated as inhibitors for mild steel corrosion in 15% HCl solution using weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) techniques. It was found that the inhibition efficiency of both the inhibitors increases with increase in concentration of inhibitors and decreases with increase in temperature. The inhibitors, PBIP and MBIP, show corrosion inhibition efficiency of 92.6% and 91.4% at 300 ppm concentration, respectively, at 303 K. Polarization studies showed that both the studied inhibitors were of mixed type in nature. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were performed for surface study of uninhibited and inhibited mild steel samples. The semi-empirical AM1 method was employed for theoretical calculations.

Comparative Investigation of Corrosion-Mitigating Behavior of Thiadiazole-Derived Bis-Schiff Bases for Mild Steel in Acid Medium: Experimental, Theoretical, and Surface Study

“…The estimated activation energies for the all the inhibited solutions was found to be greater in comparison to the solution with bare acid, as summarized in Table . Higher the value of activation energy, E a corresponds to increase in the energy barrier for the corrosion phenomenon. , As a result, inhibition efficiency is increased in the case of inhibited systems.…”

“…Higher the value of activation energy, E a corresponds to increase in the energy barrier for the corrosion phenomenon. 27,28 As a result, inhibition efficiency is increased in the case of inhibited systems.…”

“…Also, the effect gets more pronounced on increasing the concentration of inhibitors. 28 Now, considering all the factors, on comparing all the inhibitors, PMTTA was found to be most efficient with a maximum inhibition efficiency of 94.6% at 125 ppm concentration. The order of E EIS % was attained as PMTTA > PATT > PMTA > PTA.…”

In-situ preparation, characterization and anticorrosion property of polypropylene glycol/silver nanoparticles composite for mild steel corrosion in acid solution

“…The absolute values of DG 0 ads are in the range of À35.00 to À40.72 kJ/mol which is within the threshold value interpreted in the corrosion literature for comprehensive mode of adsorption (i.e. both physical and chemical adsorption) [49,50]. Meanwhile, a close inspection of Table 4 reveals that at lower temperature, physical adsorption mechanism prevails over chemical adsorption and DG 0 ads values become less negative.…”

Revestimentos com propriedades de autorreparação contendo metacriloxipropiltrimetoxisilano como formador de filme.

“…Analisando o diagrama de Bode na Figura 44 para os tempos de 3 e 6 horas, nota-se que o diagrama do sistema CMC_SDF é semelhante ao diagrama do sistema SMC_SDF e apresentam a mesma ordem de grandeza para os valores de |Z| na região de baixa frequência. Logo, conclui-se que as propriedades de barreira de ambos os filmes são semelhantes e que a adição das microcápsulas não prejudicou essa importante característica da tinta.Em relação ao sistema CMC_SDF, nota-se que a diminuição da resistência é mais lenta, pois em 9 horas de imersão a resistência ainda apresenta valores com ordem de grandeza de 10 9 e apenas em24 horas de imersão diminui para 8,64 x10 8 Ω.cm 2 . transferência de carga.…”