Adsorption and Corrosion Inhibition Characteristics of Some Nicotinamide Derivatives on Mild Steel in Hydrochloric Acid Solution

Abstract

The present investigation includes the study of corrosion inhibition effect of N-(1H-Indol-3-ylmethylene)-nicotinamide (IMN) and N-(3,4,5-trimethoxy-benzylidene)-nicotinamide (TMN) on mild steel in 0.5 M HCl by mass loss and electrochemical measurements. The obtained results showed that inhibition efficiency increased with the increasing concentration of inhibitors and decreased with increase in temperature and immersion time. Potentiodynamic polarization curves indicate that both IMN and TMN were acting as mixed type of inhibitors. Langmuir adsorption isotherm model was employed to determine the equilibrium of adsorption for inhibiting process in both inhibitors. Nyquist plots revealed that, as the concentration of the inhibitors increases, double layer capacitance (Cdl) and corrosion current (icorr) decreases, while polarization resistance (Rp) increases. Various thermodynamic parameters for the adsorption of inhibitors on mild steel were computed and discussed. The passive film formed on the metal surface was characterized by FTIR, EDX, and SEM.

Synthesis, Cyclic Voltammetric, Electrochemical, and Gravimetric Corrosion Inhibition Investigations of Schiff Base Derived from 5,5-Dimethyl-1,3-cyclohexanedione and 2-Aminophenol on Mild Steel in 1 M HCl and 0.5 M H2SO4

“…Mild steel is used very commonly in industries because of its good weldability due to low carbon content as well as optimum mechanical properties at a cheaper cost [1][2][3][4]. However they easily undergo acid attack and get corroded.…”

Experimental and Theoretical Study of Some N-pyridinium Salt Derivatives as Corrosion Inhibitors for Mild-steel in 1 M H2SO4

“…Minimum energy calculations were performed using molecular mechanics/ MM+ level; then, the semi-empirical calculations were made with PM3 method [19]. For this purpose, the Hyperchem program [20] with complete geometry optimization was used.…”

Adsorption and Thermodynamic Studies of N-(6-Aminobenzo[d]thiazol-2-Yl)benzamide on Mild Steel in Acid Medium

“…This compound obeys Langmuir and Tempkin adsorption isotherms which are shown in figure 8 and 9. As the adsorption process of the inhibitor molecule on the mild steel in the acid medium obeys Langmuir and Tempkin isotherm, the organic inhibitor molecule is attached as a monolayer on the metal surface through physical mechanism 13 .…”