Theoretical and experimental studies of a new aniline derivative corrosion inhibitor for mild steel in acid medium

Abstract

4‐Chloro‐N‐(pyridin‐2‐ylmethyl)aniline (CPYA) was synthesized by a simple and inexpensive method and tested as a corrosion inhibitor in acid medium for mild steel by using gravimetric studies and electrochemical measurements. An average maximum efficiency of 96.0% was achieved at 4.59 mmol/L. Corrosion kinetic and thermodynamic parameters were also analyzed. Surface analyses (atomic force microscopy and scanning electron microscopy) show that protection is enabled by adsorption on the metal, forming a film. Quantum chemical calculations were performed to access information regarding the molecular structure in the corrosive medium and to support interpretation of the results obtained by experimental methods.

Sulfonated Zinc Phthalocyanine Coating as an Efficient and Ecofriendly Corrosion Inhibitor for Copper Surfaces: An In Silico Led Design and Its Experimental Validation

“…The average RMS roughness values for the bare copper, corroded copper, and inhibitor coated copper were 29.17, 73.66, and 58.12 nm, respectively. The copper sample without any inhibitor was severely damaged due the corrosive medium, while the inhibitor-coated sample remarkably showed less damage, as in Figure c and f. This also proves that the ZnPc-S layer protected the copper surface from an attack of the corrosive medium …”

“…This also proves that the ZnPc-S layer protected the copper surface from an attack of the corrosive medium. 69…”

DNA-interacting properties of two analogous square-planar cis-chlorido complexes: copper versus palladium

“…The IR spectra of these complexes present a characteristic band at 3189 cm −1 assigned to the amine group (Figs.S1 and S2). This band is shifted upon metal coordination compared with that for the free CPYA ligand at 3365 cm −1[29]. The 1 H NMR spectrum of complex 2 (Fig.S3) in DMSO-d 6 confirms its structure in solution.…”

“…S1 and S2). This band is shifted upon metal coordination compared with that for the free CPYA ligand at 3365 cm −1 [ 29 ]. The 1 H NMR spectrum of complex 2 (Fig.…”

“…All starting materials were purchased from commercial sources and used without further purification. The ligand 4-chloro- N -(pyridin-2-ylmethyl)aniline (CPYA) and the complex precursor Na 2 [PdCl 4 ] were synthesized and characterized following reported procedures [ 29 , 30 ]. Infrared spectra were measured from 4000 to 600 cm –1 on a Varian 660 FTIR equipped with Pike Miracle diamond/ZnSe ATR.…”