Jurnal Kimia Sains dan Aplikasi,
Journal Year:
2024,
Volume and Issue:
27(12), P. 569 - 579
Published: Dec. 19, 2024
This
research
investigates
the
thermodynamic
characteristics
of
chitosan
as
a
corrosion
inhibitor
for
carbon
steel
in
chloride
electrolyte
environments,
specifically
saturated
sodium
and
1
M
hydrochloric
acid,
across
different
temperatures
concentrations.
The
study
aimed
to
evaluate
effectiveness
preventing
examine
adsorption
process.
results
revealed
that
achieved
highest
inhibition
efficiency
90.07%
acid
solution
with
concentration
250
mg/L
at
303.15
K.
In
contrast,
maximum
was
50.50%
same
Thermodynamic
analysis
showed
is
spontaneous
exothermic
both
media.
standard
free
energy
found
be
-38.63
kJ/mol
K,
decreasing
-43.69
343.15
K
NaCl,
-42.40
-48.65
HCl.
enthalpy
-0.24976
NaCl
4.93560
HCl,
while
entropy
-0.12661
J/mol·K
-0.15610
Additionally,
activation
increased
from
1.61
0
6.96
4.10
23.79
SEM
confirms
formation
protective
film,
significantly
reducing
damage
compared
uninhibited
conditions.
These
findings
indicate
highly
effective
favorable
applications
chloride-containing
environments.
ACS Omega,
Journal Year:
2024,
Volume and Issue:
9(49), P. 48536 - 48545
Published: Nov. 27, 2024
Natural
marañon
nutshell
extract
was
obtained
by
mechanical
compression.
The
combined
with
ethanol
and
a
nonionic
surfactant,
it
labeled
as
EES.
EES
inhibitor
effect
on
S135
carbon
steel,
exposed
to
simulated
marine-coastal
environment
(SME),
deduced
mass
loss
measurement,
adsorption
isotherm,
electrochemical
measurements,
surface
analysis.
Langmuir
isotherm
suggested
that
monolayer
of
the
attached
physical–chemical
interaction
steel
surface.
increase
in
protective
efficiency
adsorbed
ascribed
gain
coverage
function
concentration.
It
considered
an
antioxidant
activity
inhibitor,
attributed
mostly
Fe-ion
capture
anacardic
acid
posterior
ion
chelation.
This
fact
collaborated
negative
zeta
potential
extract,
added
SME.
Electrochemical
impedance
spectroscopy
(EIS)
diagrams
revealed
polarization
resistance
(Rp)
increased
concentration,
while
thickness
(d)
Fe-oxide
layer
reduced
≈0.50
nm.
Jurnal Kimia Sains dan Aplikasi,
Journal Year:
2024,
Volume and Issue:
27(12), P. 569 - 579
Published: Dec. 19, 2024
This
research
investigates
the
thermodynamic
characteristics
of
chitosan
as
a
corrosion
inhibitor
for
carbon
steel
in
chloride
electrolyte
environments,
specifically
saturated
sodium
and
1
M
hydrochloric
acid,
across
different
temperatures
concentrations.
The
study
aimed
to
evaluate
effectiveness
preventing
examine
adsorption
process.
results
revealed
that
achieved
highest
inhibition
efficiency
90.07%
acid
solution
with
concentration
250
mg/L
at
303.15
K.
In
contrast,
maximum
was
50.50%
same
Thermodynamic
analysis
showed
is
spontaneous
exothermic
both
media.
standard
free
energy
found
be
-38.63
kJ/mol
K,
decreasing
-43.69
343.15
K
NaCl,
-42.40
-48.65
HCl.
enthalpy
-0.24976
NaCl
4.93560
HCl,
while
entropy
-0.12661
J/mol·K
-0.15610
Additionally,
activation
increased
from
1.61
0
6.96
4.10
23.79
SEM
confirms
formation
protective
film,
significantly
reducing
damage
compared
uninhibited
conditions.
These
findings
indicate
highly
effective
favorable
applications
chloride-containing
environments.
