Perspectives on Corrosion Inhibition Features of Novel Synthesized Gemini-Fluorinated Cationic Surfactants Bearing Varied Spacers for Acid Pickling of X60-Steel: Practical, and In Silico Calculations

Abstract

Through our present study, three novel Gemini-fluorinated cationic surfactants bearing different spacers (FSG6-2, FSG6-4, and FSG6-6) were synthesized, and their structures were explained via different spectroscopic instruments such as 1H, 13C, and 19F NMR spectra. The surface activity of the as-prepared surfactants was examined. The inhibiting influence of FSG6 molecules on the X60 steel corrosion in the pickling solution (HCl) was examined by diverse methods comprising electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and X-ray photoelectron spectroscopy (XPS) experimentations, and computational calculations. The inhibition effectiveness of FSG6 surfactants followed the order of 93.37% (FSG6-2) < 96.74% (FSG6-4) < 98.37% (FSG6-6) at 2.0 × 10−4 M. The FSG6 surfactants function as mixed-type inhibitors, according to PDP investigations. The H2O molecules that adsorbed on the steel interface were substituted with surfactant molecules, and the surfactant’s inhibitory activity is likely caused by the improvement in an adsorptive layer on the steel substrate, as specified by the EIS results. The Langmuir isotherm describes the absorption of FSG6 molecules on the metal surface. The XPS investigations validate the steel interface’s extremely protective nature. The mechanism of interaction between FSG6 molecules with an X60-steel employing the DFT calculations and MC simulations methods was also examined and discussed.

Bishydrazone ligand and its Zn-complex: synthesis, characterization and estimation of scalability inhibition mitigation effectiveness for API 5L X70 carbon steel in 3.5% NaCl solutions

“…65 The second peak 4002.23, 400.63 eV corresponds to protonated nitrogen atoms (–C N + –) in the H 2 TTAH and Zn-H 2 TTAH inhibitors. 66 Furthermore, the S 2p spectra show distinct peaks ( Fig. 7 and 8 ).…”

The Inhibition Action of Some Brij-Type Nonionic Surfactants on the Corrosion of OLC 45 in Various Aggressive Environments

“…Metallic materials have a huge degree of significance for mankind, and have played a decisive role in a diversity of applications due to their flexible attributes and low cost. Metals and their alloys represent a wide area utilized in various technological practices, such as chemical procedures, petroleum manufacturing and purification, industrial machinery, marine processes and automotive industry, and this has enhanced the exploration of corrosion inhibition in several aggressive media [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. In many industrial practices, the substrates of the materials utilized are exposed to extremely corrosive acid, alkali, and saline environments, which produce (provoke) substantial destruction through corrosion.…”

“…Hence, Brij is helpful for emulsifying fats and oils in highly acidic or alkaline media. Its physical properties can be presented as follows: all are waxy solids; Brij 35: CMC 0.08 mM, HLB 16.9, mp = 43 • C, ρ =1.05 g/cm 3 ; Brij 56: CMC 0.035 mM, HLB 12.9, mp = 31 • C, ρ = 0.98 g/cm 3 ; and Brij 58P: CMC 0.075 mM, HLB 15.7, mp = 38 • C, ρ =1.01 g/cm 3 . The aim of this study was to find new "environmentally friendly" organic compounds suitable for the corrosion protection of base metals.…”