Synergistic Inhibition Effect of 9-(4-Chlorophenyl)-1,2,3,4-tetrahydroacridines and Tween-80 for Mild Steel Corrosion in Acid Medium

Abstract

The synergistic inhibition effect of Tween-80 and 1,2,3,4-tetrahydroacridines, including 9-(4-chlorophenyl)-2-methyl-1,2,3,4-tetrahydroacridine (CMT) and ethyl 9-(4chlorophenyl)-1,2,3,4-tetrahydroacridine-2-carboxylate (ECT), on mild steel corrosion in 1 M HCl was investigated by using weight loss tests, electrochemical techniques, and surface morphology (SEM/SECM). The results indicated that the mixtures of CMT/ECT and Tween-80 strongly inhibit the corrosion of mild steel compared to individual inhibitors, and the adsorption mode belongs to the Langmuir isothermal type. Electrochemical measurements showed that the mixtures were mixed-type inhibitors, and a double-layer structure film with the inner layer of Tween-80 and the outer layer of CMT/ECT was formed on the steel surface. That the calculated synergistic parameter value was larger than unity illustrates that the enhancement of inhibition in the presence of Tween-80 is only due to synergistic action. Surface analysis techniques (SEM/SECM) verified that CMT and ECT were absorbed on the steel surface along with Tween-80 in the presence of mixtures, effectively controlling the metal corrosion.

Direct Growth of Hexagonal Boron Nitride Nanofilms on Stainless Steel for Corrosion Protection

“…Only one constant phase element (CPE), Q st , was included in the circuit to model the corrosion growth at the interface of the electrolyte and the metal. On the other hand, for the case of h -BN-coated ss304, a two-time constant method was employed to obtain the circuits, including Q 1 and Q 2 signifying the CPE magnitude at the coating and the interface, respectively, the resistance of coating ( R 1 ), and the charge-transfer resistance of the metal/coating interface ( R 2 ). − …”

Synergistic inhibition effect of N‐(furan‐2‐ylmethyl)‐7H‐purin‐6‐amine and iodide ion for mild steel corrosion in 1 mol/L HCl

“…The synergistic inhibition effect of FYPA and KI can be described by the synergistic parameter S, which is defined using the following formula: where I 1+2 = ( I 1 + I 2 ), I 1 is the η of FYPA, I 2 is the η of KI, and is the η of FYPA + KI. Generally, S > 1 is indicative of a synergistic effect, whereas S < 1 implies that antagonistic behavior prevails . The S values were calculated on the basis of weight‐loss tests and electrochemical techniques data, and the results are listed in Table .…”

Acridine and Its Derivatives: Synthesis, Biological, and Anticorrosion Properties

“…The thermodynamic study showed that the inhibitors followed the Langmuir adsorption isotherm and underwent physisorption. Zhang et al [ 50 ] designed and synthesized two other tetrahydroacridines ( Figure 3 b), namely 9-(4-chlorophenyl)-2-methyl-1,2,3,4-tetrahydroacridine (CMT) and ethyl 9-(4-chlorophenyl)-1,2,3,4-tetrahydroacridine-2-carboxylate (ECT), which are a slight variation of MPTA and EPTA, respectively, as CIs of mild steel in 1 M HCl. CMT and ECT, at a concentration of 200 ppm, imparted a maximum IE of 98.0% and 93.8%, respectively, via the WL technique.…”