Abstract
This research investigates the effect of Schiff base, namely, N'-[4-(dimethylamino) benzylidene]-4-hydroxybenzohydrazide (SB) on the corrosion mitigation of mild steel (MS) in hydrochloric acid medium (HCl) using potentiodynamic polarization (PDP) technique. The study highlights the effect of SB concentration, HCl concentration, and temperature on the corrosion current density (icorr) and inhibition efficiency (IE). The adsorption of SB onto the MS surface was justified with the support of kinetic and thermodynamic parameters. The morphological behavior of the MS surface was analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). A blend of statistical study and interaction plots has been applied to obtain a thorough understanding of the corrosion parameters. Experimental results obtained by PDP measurements revealed that tested compounds had a good anti-corrosion capacity. The main and interaction effects of the parameters on the response were analyzed using Box-Behnken Design. An empirical model equation from experimental results elucidates the relationship among the variables. The optimized parameters for the maximum output were recognized. The maximum IE of 81.5 was predicted by RSM with temperature (A = 30 °C), HCl concentration (B = 0.5 M), and Inhibitor concentration (C = 0.0001 M). Using RSM, further analyses regarding individual and interaction effects between the variables can be more comprehensive. Few more parameters such as pH and time can be included in the future study.Graphic
Highlights
Mild steel is one of the extensively used ferrous alloys for a wide range of applications
According to the literature [25], if the shift in the corrosion potential (Ecorr) value was on an average of less than ± 85 mV concerning blank, it suggests the mixedtype behavior of inhibitor and it hold holds good in the present study
The % inhibition efficiency (IE) increased with an increase in SB concentration
Summary
Mild steel is one of the extensively used ferrous alloys for a wide range of applications. DoE is a statistical and mathematical tool applied to elucidate the significance of specific processes and optimize system behavior. It aids in determining the factors with significant contribution to the process and their interaction effects [13, 14]. The present investigation emphasizes the corrosion inhibition process as well as statistical study, which includes a proper design of experiments to acquire data about the optimization conditions. This research is, designed for dual purposes: (i) to establish the effectiveness of Schiff base as a corrosion inhibitor (ii) the use of Schiff base as an anti-corrosion agent for mild steel in acidic media with an optimization approach
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