Abstract
The
corrosion
of
metals
in
acidic
environments
remains
a
significant
challenge,
driving
the
search
for
sustainable
and
eco‐friendly
inhibitors
derived
from
natural
sources.
This
study
evaluates
inhibition
potential
three
extracts
Cannabis
sativa
L.,
namely
ethanol
extract
(EET),
hexane
(EHX),
dichloromethane
(EDM),
mild
steel
1
M
HCl
medium.
investigation
employed
weight
loss
(WL)
measurements,
electrochemical
impedance
spectroscopy
(EIS),
potentiodynamic
polarization
(PDP)
techniques.
To
understand
their
inhibitive
performance,
density
functional
theory
(DFT)
was
used.
For
more
comprehensive
theoretical
analysis,
Monte
Carlo
(MC)
molecular
dynamics
(MD)
simulations
were
efficiency
increased
with
increase
EET,
EHX,
EDM
concentrations
up
to
91
%,
89
83
respectively,
obtained
at
308
K
0.8
g/L
concentration.
Polarization
studies
classify
as
mixed‐type
predominantly
anodic
effect,
functioning
through
adsorption
on
metal
surface.
these
conforms
Langmuir
isotherm
model,
equilibrium
constants
(K
ads
)
3.0143
M,
5.1245
2.2009
EDM,
highlighting
effective
inhibitors.
EET
exhibits
high
activation
energy
(E
101.70
kJ/mol,
while
EHX
show
E
values
79.05
kJ/mol
82.93
all
significantly
higher
than
blank,
which
is
30.23
indicating
that
effectively
inhibit
by
increasing
energy,
being
most
potent
inhibitor.
Theoretical
approaches
based
DFT,
MC,
MD
clearly
explain
mode
majority
molecules
process
may
result
synergistic
intermolecular
effect
major
compounds
extract,
interact
various
active
sites
Simulations
indicate
catechin
dihydrate
(52.42
%),
linoleic
acid
(42.92
naringenin
(41.92
%)
are
close
surface,
suggesting
strong
interactions
material.
results
experimental
measurements
calculations
agree,
developing
plant‐derived
compounds.
Nitrogen
and
sulfur
codoped
carbon
dots
(SB-CDs)
were
developed
from
sugar
cane
bagasse,
an
agro-industrial
waste,
evaluated
as
eco-friendly
corrosion
inhibitor
for
Q235B
steel
in
HCl
solution.
The
surface
coverage
of
the
adsorbed
SB-CDs
is
strongly
influenced
by
immersion
time
(6
72
h,
both
static
dynamic
conditions)
concentration
(20-200
mg/L).
Maximum
uniform
achieved
with
150
mg/L
SB-CDs.
At
this
concentration,
demonstrated
a
high
inhibition
efficiency
96%
after
6
h
immersion,
maintaining
effectiveness
at
94
92%
under
conditions,
respectively,
immersion.
Electrochemical
studies
showed
that
polarization
resistance
(Rp)
increased,
current
density
(Icorr)
decreased
presence
compared
to
uninhibited
specimens,
confirming
SB-CDs'
adsorption
on
metal
surfaces.
Additionally,
analysis
using
scanning
electron
microscopy
atomic
force
confirmed
improved
morphology
fewer
features,
supporting
formation
protective
film.
Energy-dispersive
X-ray
photoelectron
spectroscopy
analyses
further
confirm
layer
SB-CDs,
attributed
interaction
nitrogen-,
oxygen-,
sulfur-containing
functional
groups
surface.
Therefore,
homogeneously
entirely
blocks
iron
chloride/oxide/hydroxide
intermediates,
ensuring
corrosive
environments.
Coatings,
Год журнала:
2025,
Номер
15(3), С. 308 - 308
Опубликована: Март 6, 2025
This
study
explores
the
corrosion
behavior
of
pure
copper
in
simulated
oilfield-produced
water
and
evaluates
inhibitory
effect
cetylpyridinium
chloride
(CPC)
on
microbiologically
influenced
(MIC).
Weight
loss
tests,
potentiodynamic
polarization,
pitting
analyses
revealed
that
sulfate-reducing
bacteria
(SRB)
activity
significantly
accelerated
corrosion,
with
maximum
pit
depth
reaching
7.54
µm
absence
CPC—approximately
1.83
times
greater
than
under
abiotic
conditions.
The
introduction
CPC
substantially
reduced
rates
depths,
depths
decreasing
to
2.97
µm,
1.11
1.02
at
10,
50,
80
mg/L
CPC,
respectively.
inhibited
SRB
biofilm
formation,
metabolic
activity,
product
accumulation,
achieving
an
inhibition
efficiency
up
89%
mg/L.
These
findings
highlight
CPC’s
dual
role
as
a
biocide
inhibitor,
offering
promising
approach
controlling
MIC
oilfields
similar
industrial
environments.
Inorganic Chemistry Communications,
Год журнала:
2024,
Номер
167, С. 112832 - 112832
Опубликована: Июль 6, 2024
In
this
study,
we
explore
the
effectiveness
of
glutamic
acid
as
corrosion
inhibitor
for
protecting
steel
rebars
within
a
concrete
pore
solution
contaminated
with
chloride
(CCCPS)
along
its
synergy
galvanized
coating
are
investigated.
The
study
is
defined
in
two
phases:
(a)
examining
inhibition
efficiency
(%IE)
at
various
concentrations
0.25,
0.50,
0.75,
and
1
g/L
using
combination
experimental
theoretical
methods,
(b)
evaluating
synergistic
effect
Zn
present
coating.
first
phase,
electrochemical
tests
investigations
employed.
examinations
consistently
demonstrated
that
concentration
g/L,
maximum
%IE
reaches
∼
80
%.
Langmuir
adsorption
isotherm
fitting
effectively
describes
relationship
between
coverage
percentage.
Thermodynamic
data
indicate
these
inhibitors
on
surface
involves
both
physical
chemical
adsorptions
ΔG°ads
(standard
free
energy
adsorption)
around
–23.5
kJ/mol.
Moreover,
activation
rebar
increases
from
55.8
kJ/mol
blank
CCCPS
to
78.3
inhibited
CCCPS.
Molecular
dynamics
simulations
validate
binding
molecules
steel,
primarily
through
nitrogen
atoms
orientation
towards
d-orbitals
substrate.
second
carbon
underwent
hot-dip
galvanization,
resulting
thickness
approximately
36
µm.
optimum
(0.75
g/L)
was
investigated
comparison
behavior
three
samples:
bare
scratched
simulated
without
inhibitor.
Results
presence
significantly
enhances
%IE,
up
99
%,
steel.
FESEM/EDS
analysis
further
reveals
substantially
lower
volume
products
area
latter
sample
compared
counterpart
inhibitor-free
solution.
Furthermore,
indicated
by
findings
X-ray
photoelectron
spectroscopy
(XPS),
interactions
N
Fe
atoms,
acting
donors
acceptors,
respectively,
hold
significant
importance
chemisorption
process.
