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Synergistic corrosion inhibitor of carbon steel by dihydroxy benzyl phosphonic acid -Zn2+ system in O.5 M H2SO4: Experimental and theoretical studies

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Title Synergistic corrosion inhibitor of carbon steel by dihydroxy benzyl phosphonic acid -Zn2+ system in O.5 M H2SO4: Experimental and theoretical studies
 
Creator Kerkour, Rachida
Moumeni, Ouahiba
Djenane, Meriem
Chafai, Nadjib
Chafaa, Saleh
 
Subject Corrosion inhibition
DFT
FTIR
Phosphonic Acid
SEM
Synergistic effect
XC48
 
Description 402-411
The synergistic effect of dihydroxy benzyl phosphonic acid (DAP) and zinc sulfate ZnSO4 (Zn2+) system in 0.5 M H2SO4
solution on carbon steel X48 has been evaluated using potentiodynamic polarization measurements, electrochemical
impedance spectroscopy (EIS), scanning electron microscope (SEM), and quantum methods (DFT). The combination of
DPA and Zn2+ has been demonstrated to have remarkable inhibitory efficiency (96%). DPA/Zn2+ formulation operate as a
mixed inhibitor, inhibiting both the anodic and cathodic reactions to the same amount, according to polarization studies.
The diameter of the semicircles increases with the addition of DPA/Zn2+ formulation. Furthermore, the double layer
capacitance Cdl decreases and Rt values increase with this combination of DPA and Zn2+, confirming the significant
adsorption on the surface steel. The adsorption isotherm of Langmuir is approached by the adsorption on the metal surface.
The nature of the protective coating is also determined using surface characterization techniques (FTIR and SEM).
The molecular orbital (HOMO and LUMO) energies, energy gap (ΔEgap), dipole moment (μ), global hardness (η), global
softness (σ), electrophilicity index (ω), absolute electronegativity (χ) and the fraction of transferred electrons (ΔN) have
been determined as supporting evidence.
 
Date 2022-07-26T10:34:31Z
2022-07-26T10:34:31Z
2022-07
 
Type Article
 
Identifier 0975-0991 (Online); 0971-457X (Print)
http://nopr.niscpr.res.in/handle/123456789/60151
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJCT Vol.29(4) [July 2022]