Electrochemical investigations on the inhibition behavior and adsorption isotherm of synthesized di-(Resacetophenone)-1,2-cyclohexandiimine Schiff base on the corrosion of steel in 1 M HCl

Abstract

The potential of di (Resacetophenone) 1,2 cyclohexandiimine as an environmentally friendly corrosion inhibitor for steel has been investigated in 1 M HCl using potentiodynamic polarization, electro chemical impedance spectroscopy and chronoamperometry measurements. All electrochemical measure ments suggest that this compound is an excellent corrosion inhibitor for mild steel and the inhibition effi ciency increases with the increase in inhibitor concentration. The effect of temperature on the corrosion behavior of mild steel with the addition of the Schiff base was studied in the temperature range from 25 to 65°C. Adsorption of this inhibitor follows the Langmuir adsorption isotherms. The value of Activation energy and the thermodynamic parameters such as ΔH ads , ΔS ads , ΔK ads and ΔG ads were calculated by the corrosion currents at different temperatures and using the adsorption isotherm. The morphology of mild steel surface in the absence and presence of inhibitor was examined by scanning electron microscopy (SEM) images.

Investigation on Trend Removal in Time Domain Analysis of Electrochemical Noise Data Using Polynomial Fitting and Moving Average Removal Methods

“…2 Bode plots revealed one time constant for EIS response of all samples, indicating that the corrosion process is under charge transfer control in the absence and presence of different concentrations of BDAP [31]. The Bode diagrams have a similar shape throughout all tested concentrations, indicating that almost no change in the corrosion mechanism occurs due to the inhibitor addition [32][33][34]. The Bode resistance increases in the presence of inhibitor.…”

“…The most widely accepted explanation for the presence of CPE (Q dl ) behavior and depressed semicircles on solid electrodes is microscopic roughness, causing an inhomogeneous distribution in the solution resistance as well as in the double layer capacitance [35][36][37]. Constant phase element Q dl , R s , and R ct can be corresponded to double layer capacitance, Q dl =R n-1 C dl n , solution resistance and charge transfer resistance, respectively [32]. Table 1 illustrates the equivalent circuit parameters for the impedance spectra of corrosion of steel in 1 M HCl solution.…”

Thermodynamic and adsorption behavior of N2O4 schiff base as a corrosion inhibitor for API-5L-X65 steel in HCl solution

“…4. The simplest approach requires the theoretical transfer function Z(ω) to be represented by a parallel combination of a resistance R ct and a capacitance C, both in series with another resistance R s [42]:…”

Impedance Spectroscopy Studies on Corrosion Inhibition Behavior of Synthesized N,N’-bis(2,4-dihydroxyhydroxybenzaldehyde)-1,3-Propandiimine for API-5L-X65 Steel in HCl Solution

“…The inhibitor adsorption depends on parameters such as the surface charge and nature of the metal, the inhibitor structure, aggressive media type and the extent of aggressiveness and also on the nature of its interaction with the metal surface [6]. Generally the organic compounds containing hetero atoms like O, N, S and P are found to work as very effective corrosion inhibitors [7].…”