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EM in ScienceDirect
Figure/Table detail
Quantitative and qualitative insights into the corrosion mitigation mechanism of
N,N
-dibutyl aniline for mild steel in sulfuric acid
Meenakshi Gupta, Mansi Y. Chaudhary, Neeta Azad, Shramila Yadav
Extreme Materials
, 2025, 1(
3
): 44-60. DOI:
10.1016/j.exm.2025.07.001
Compound
Rs (Ω/cm
2
)
Rp(Ω/cm
2
)
Rct (Ω/cm
2
)
fmax (Hz)
CPE (μS.sncm
-
2
)
n
Cdl(μF/cm
2
)
IE (%)
NNDBA
2.218
2171
2168.78
1.74
74.92
0.7321
421.96
96.32
24
HSO
2.809
82.43
79.621
5.49
172.5
0.9515
364.28
-
Table 7
Electrochemical Impedance parameters for mild steel in H
2
SO
4
medium in the presence and absence of NNDBA at 298 K.
Other figure/table from this article
Fig. 1.
Structure of N, N Dibutyl aniline (NNDBA).
Table 1
Temperature and concentration dependent corrosion rate and inhibition efficiency of mild steel in H
2
SO
4
medium in the presence and absence of NNDBA determined via gravimetric method.
Fig. 2.
Effect of NNDBA concentration on corrosion protection performance of mild steel at all studied temperatures.
Table 2
Time-dependent mass depletion data for mild steel corrosion in H
2
SO
4
solution.
Fig. 3.
Time-dependent corrosion behavior of mild steel in H
2
SO
4
.
Fig. 4.
Temperature dependence of corrosion rate:
logC
r
vs. 1/T for mild steel in H
2
SO
4
medium in the presence and absence of NNDBA.
Table 3
Energy of activation (
E
a
) for mild steel corrosion in H
2
SO
4
medium in the presence and absence of NNDBA.
Fig. 5.
Different adsorption isotherms for mild steel in H
2
SO
4
medium in the presence and absence of NNDBA (a) Langmuir, (b) Freundlich, (c) Temkin, (d) ElAwady, (e) Flory-Huggins, and (f) Frumkin adsorption isotherm.
Table 4
Analysis of adsorption behavior using different isotherm models.
Table 5
Thermodynamic insights from the Langmuir adsorption isotherm at all studied temperatures.
Fig. 6.
Temperature dependence of adsorption equilibrium constant: logK
ads
vs.1/T.
Fig. 7.
Cathodic and anodic polarization run via PDP studies for various concentrations of H
2
SO
4
in the presence and absence of NNDBA at 298 K.
Table 6
Corrosion current and inhibition efficiency for mild steel in H
2
SO
4
medium in the presence and absence of NNDBA determined via PDP studies at 298 K.
Fig. 8.
Bode plot of mild steel in H
2
SO
4
and in 10
-1
M NNDBA at 298 K.
Fig. 9.
Nyquist plot of mild steel in H
2
SO
4
and in 10
-1
M NNDBA at 298 K.
Fig. 10.
Equivalent Circuit.
Fig. 11.
Scanning electron micrograph of mild steel in (a) 0.5H
2
SO
4
(b) 10
-1
M NNDBA in H
2
SO
4
(c) 10
-7
M NNDBA in H
2
SO
4
at 3000 magnifications.
Fig. 12.
AFM of (a) plain mild steel specimen, (b) mild steel specimen in the 0.5H
2
SO
4
solution (c) mild steel specimen in presence of 10
-1
MNNDBA
in
H
2
SO
4
.
Fig. 13.
Optimized geometry of NNDBA with HOMO and LUMO distributions and their corresponding energy levels.
Fig. 14.
Optimized geometry of protonated NNDBA with HOMO and LUMO distributions and their corresponding energy levels.
Table 8
Fukui functions (
f
*
,f
, and f
2
) for atoms of NNDBA.
Fig. 15.
Bar graph representing the Fukui functions (
f
*
,f
, and f
2
) for individual atoms of NNDBA.
Table 9
Outputs calculated by the Monte Carlo simulation for adsorption of NNDBA, on Fe (110).
Fig. 16.
MD simulation captures in (a) top view of adsorbed NNDBA molecule on mild steel surface (b) front view of interactions between NNDBA and mild steel (c) top view of adsorbed NNDBA molecule on mild steel in presence of H
2
O and H
2
SO
4
(d) top view of adsorbed NNDBA molecule on mild steel in presence of H
2
O and H
2
SO
4
.
Table 10
Comparative Overview of NNDBA and Structurally Related Corrosion Inhibitors.
Fig. 17.
Visualization of interaction between NNDBA and mild steel (MS) surface.
