Theoretical and Experimental Studies on the Corrosion Inhibition Potentials of Two Tetrakis Pyrazole Derivatives for Mild Steel in 1.0 M HCl

Abstract

The inhibition performance and mechanism of N 1 ,N 1 ,N 3 ,N 3 -tetrakis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)propane-1,3-diamine (BF2) and N 1 ,N 1 ,N 2 ,N 2 -tetrakis((3,5-dimethyl-1H-pyrazol-1-yl)methyl) benzene-1,2-diamine (BF4) for the corrosion of mild steel in 1.0 M HCl were investigated using weight loss method and electrochemical measurements. The results show that both tetrakis pyrazole derivatives act as good inhibitors, and inhibition efficiency follows the order: BF4 > BF2. Two tetrakis pyrazole derivatives are mixed type inhibitors exhibiting predominantly cathodic behavior. The Nyquist plots showed that, after increasing inhibitors' concentrations, charge-transfer resistance increased and double-layer capacitance decreased, involving increased inhibition efficiency. The adsorption of both inhibitors on a steel surface obeyed Langmuir model, thus, the thermodynamic and kinetic parameters were calculated and discussed. Quantum chemical parameters are calculated using the Density Functional Theory method (DFT). Correlation between theoretical and experimental results is discussed.

The study of the aqueous extract of leaves of Pancratium Foetidum Pom as: Characterization of polyphenols, flavonoids, antioxidant activities and Ecofriendly corrosion inhibitor

“…It can be observed that from Fig. 3, both the cathodic and anodic reactions were suppressed with the addition of inhibitor, which suggested that the inhibitor studiedreduced anodic dissolution and also retarded the hydrogen evolution reaction [7]. Table 3.…”

“…Table 3. It can be observed that from (Figure 3), both the cathodic and anodic reactions were suppressed with the addition of inhibitor, which suggested that the inhibitor studiedreduced anodic dissolution and also retarded the hydrogen evolution reaction [7]. The corrosion potentials (E corr ) for the mild steel in the presence of aqueous extract are slightly shifted toward the positive potentials compared with the mild steel in 1.0 M HCl.…”

“…Considerable efforts have been made to find suitable compounds to be used as corrosion inhibitors in various corrosive media to stop or retard the corrosion of a metal. Recently, several studies have been carried out on the inhibition of corrosion of metals by synthetic organic molecules [3][4][5][6][7]. In spite of the high efficiency of these synthesized organic compounds, they cause side effects on the environment, hence the need to replace them with biodegradable inhibitors, which are eco-compatible with the environment and which do not have side effects on the living being [8][9][10][11].…”

Inhibition effect of 1,1´-(pyridine-2,6-dihylbis(methylene))bis(5- methyl-1-H-pyrazole-3-carboxylic acid) on the corrosion of mild steel in 1 M HCl. Part A: Experimental study

“…Table 1 listed the corrosion rate values and the efficiencies of the inhibitions for each concentration, it is clear that 1,1´-(pyridine-2,6-dihylbis(methylene))bis(5-methyl-1-Hpyrazole-3-carboxylic acid) showed a best inhibitive effect, the efficiency reach until 93% in HCl 1 M medium at 10 -3 mol/l. This result could be explain by the fact that the adsorption coverage increases with the increase of inhibitor´s concentration, which shields the mild steel surface efficiently from the medium [5]. …”

“…In order to search for new corrosion inhibitors in various acid media, our laboratory has published several works [3][4][5][6][7].…”