Optimization of Inhibition Efficiency of a Schiff Base on Mild Steel in Acid Medium: Electrochemical and RSM Approach

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 Abstract

WITHDRAWN: N,N′-bis(salicylidene) butylene-1,4-diamine, a synthesized Schiff base, as a mixed-type inhibitor for carbon steel in HCl medium: Experimental and theoretical approaches

“…A class of organic compounds known as Schiff's bases are synthesized by condensation of aliphatic or aromatic amines with aldehyde. Recently, they have been found to be excellent corrosion protectors for CS in several environments, especially sulphuric and hydrochloric acids [7][8][9][10][11][12][13][14][15][16][17][18][19]- [20]. A few scientists attributed the inhibition e cacy to the existence of vacant π* orbitals in Schiff base molecules.…”

“…and Lavanya [20] to nd out how it affected the inhibition of corrosion in HCl-treated mild steel. Kinetic and thermodynamic parameters con rmed the synthesized inhibitor's ability to bind to mild steel.…”

Recent Advances on the Corrosion Inhibition Behavior of Schiff base Compounds on Mild Steel in Acidic Media

“…[26][27] Most studies have considered only the impact of temperature, acid, and inhibitor concentration on the corrosion rate and inhibition efficiency. [28] In contrast, the optimization features for corrosion mitigation have rarely been addressed. Regarding this discussion, Kumari and Lavanya [28] evaluated the corrosion-inhibitive performances of Schiff base N'-[4-(dimethylamino) benzylidene]-4-hydroxybenzohydrazide (SB) (Figure 5) on mild steel in HCl using the PDP method.…”

“…[28] In contrast, the optimization features for corrosion mitigation have rarely been addressed. Regarding this discussion, Kumari and Lavanya [28] evaluated the corrosion-inhibitive performances of Schiff base N'-[4-(dimethylamino) benzylidene]-4-hydroxybenzohydrazide (SB) (Figure 5) on mild steel in HCl using the PDP method. Purposefully, this study has underlined the effect of SB concentration, HCl concentration, and temperature on inhibition efficiency to obtain information about the optimization conditions.…”

“…Most studies have considered only the impact of temperature, acid, and inhibitor concentration on the corrosion rate and inhibition efficiency [28] . In contrast, the optimization features for corrosion mitigation have rarely been addressed.…”