Synthesis New Pyridinium Salts as Corrosion Inhibitors for Mild Steel in 1 M H2SO4

Abstract

Some new pyridinium salts, namely 4-(4-Chloro-benzylidene-hydrazinocarbonyl)-1-phenyl-pyridinium bromide, C1; 4-(4-Chloro-benzylidene-hydrazinocarbonyl)-1-butyl-pyridinium bromide, C2; 4-(4-Chloro-benzylidene-hydrazinocarbonyl)-1-phencyl-pyridinium bromide, C3; were synthesized and Corrosion inhibitors for mild steel were tested in a 1M H2SO4aqueous solution at 20ºC for 24 hours using weight loss measurements. The findings revealed that the inhibition efficiency of all pyridinium bromide derivatives converges at the maximum concentration. An increase in inhibitor concentration is associated with a decrease in corrosion rate, an increase in inhibition efficiencies, and an increase in surface degree of coverage. The physisorption effects for (C1, C2, and C3) were revealed by the free energy values of adsorption, which provided useful information for predicting the interaction between the metal surface and organic molecules as corrosion inhibitors.

Study of The Inhibition Corrosion of Aluminum Metal Using Peppermint Oil in An Acidic Medium

“…therefore, the expected adsorption process on the surface is physical adsorption, and this is consistent with what was found that the inhibition efficiency decreases with increasing temperature [14].the values of the corosion rate can be used to analyze the adsorption mechanism according to Freundlich equation, which was calculated using equation (7) [15] 𝜃 = 𝐾𝑓𝐶𝑖𝑛 ……………………………. ( 6) 𝑙𝑛𝜃 = 𝑙𝑛𝑘𝑓 + 𝑛𝑙𝑚𝐶𝑖……………………………… (7) ln θ values are plotted against ln Ci, the slope represents n values, and the intercept represents ln K ads [10]. Figure (10) represents the relationship between ln θ and ln Ci.From the values of 4), it is clear that the Freundlich isotherm applies well with this system.…”

“…( 6) 𝑙𝑛𝜃 = 𝑙𝑛𝑘𝑓 + 𝑛𝑙𝑚𝐶𝑖……………………………… (7) ln θ values are plotted against ln Ci, the slope represents n values, and the intercept represents ln K ads [10]. Figure (10) represents the relationship between ln θ and ln Ci.From the values of 4), it is clear that the Freundlich isotherm applies well with this system. But the Langmuir isotherm does not apply to system adsorption because its correlation coefficient has lower values.…”

“…The thermodynamic study is important in explaining the occurrence of adsorption and identifying the nature of the system and gives a description of the nature of the regularity of the particles [16].…”

“…The corrosion kinetics was controlled by Arrhenius equation (10), The relationship is linear between Ln K and 1/T in the temperature range [17] (303 ,333 K).Figure (14) (15) represents the Arrhenius relationship for both the and the inhibitor, respectively K=A e -Ea/RT ……………………… (10) The equation can be written as follows:…”

Synthesis New Triethylammonium Salts as Corrosion Inhibitors for Mild Steel in 1 MH2SO4

“…The topic of mild steel corrosion inhibitors in acidic environments has been the focus of several scientific investigations [7][8][9][10][11][12].…”