Assessment of the Inhibition Efficiency of 3-amino-5-methylthio-1H-1,2,4-triazole Against the Corrosion of Mild Steel in Acid Chloride Solution

Abstract

Influence of 3-amino-5-methylthio-1H-1,2,4-triazole (AMTTA) concentration on the corrosion of C45 mild steel in acid chloride solutions were studied. The potentiodynamic (PD) polarization, electrochemical impedance spectroscopy (EIS) methods and quantum chemical calculations were used. The surface morphology of specimens were observed through inverted metallographic microscope (IMM). It has been shown that the inhibition efficiency increased with an increase in the concentration of 3-amino-5-methylthio-1H-1,2,4-triazole. Tafel polarization study revealed that AMTTA acted as mixed type inhibitor. The best fit to the experimental data was obtained using Temkin adsorption isotherm. It was found that the adsorption of inhibitor on the mild steel surface takes place through a typical physisorption. Moreover, the adsorption mechanism of AMTTA on C45 mild steel surface was proposed and discussed.

SVET and SIET Study of Galvanic Corrosion of Al/MgZn2in Aqueous Solutions at Different pH

“…The solutions used were prepared with analytical grade chemicals and distilled water. Electrochemical measurements were carried out in a corrosion cell containing 300 mL of electrolyte using the three electrode system with the test sample as working electrode, platinum plate as the counter electrode and saturated calomel electrode 27 as the reference electrode. All electrochemical tests were carried out in 0.1 M NaCl solution in an aerated environment at an ambient temperature of (21 ± 2 • C).…”

Investigation of Corrosion Protection of Austenitic Stainless Steel in 5.5 M Polluted Phosphoric Acid Using 5-Azidomethyl-7-morpholinomethyl-8-hydroxyquinoline as an Ecofriendly Inhibitor

“…These results suggest that the anions, the chloride, and sulfate ions will undergo an electrostatic attraction (physical adsorption) towards the positively charged metal surface and will form the primary adsorbed layer of anions on the oxide film. In our case of alloy 321, chromium and nickel exist in the passive film as (Cr 2 O 3 ) and (NiO) [29]. After this first adsorption of anions, the electrode surface will become negatively charged; therefore, the protonated inhibitor molecules will be attached with the first adsorption layer by physical interaction.…”

“…It is worth mentioning that, in acidic solutions, organic inhibitor molecules can be protonated, i.e., they can exist in their cationic form [29]. Thus, in acid solution, both neutral molecules and cationic forms of inhibitor can exist.…”