Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Дек. 28, 2024
Chloride-induced
corrosion
of
steel
rebars
embedded
in
mortar
was
effectively
controlled
by
blending
gallic
acid
wet
mixture.
Mixing
optimized
concentration
(GA)
inhibitor
(0.125%)
mortars
considerably
increased
the
charge
transfer
resistance
(80.11
Ω
cm2)
comparison
to
that
noted
for
control
(3.36
after
37
cycles
wet/dry
treatments.
The
inhibition
efficiency
this
cycle
exposure
order
95%.
studied
also
improved
workability
(%
flow
mix)
from
25%
43%
at
its
optimum
dosing.
It
is
suggested
GA
transforms
into
negatively
charged
gallate
anions
an
alkaline-pore
solution
concrete
and
electrostatically
attracted
positively
calcium
ions,
forming
a
complex
with
partial
positive
charge.
This
interacts
maghemite
film
formed
on
rebar
surface
forms
protective
FeO−
Ca++–
anion,
isolating
it
aggressive
electrolyte.
experimental
results
showed
Ca++
ion
had
strong
synergistic
effect
boosting
inhibitive
performance
GA.
84.1%
presence
only
97.9%
mixture
ions.
Coatings,
Год журнала:
2025,
Номер
15(1), С. 37 - 37
Опубликована: Янв. 2, 2025
Due
to
their
barrier
effect
against
chloride
penetration,
corrosion
inhibitors
are
widely
used
prevent
chloride-induced
in
reinforced
concrete
structures.
The
mechanisms
of
interaction
between
the
protective
film
on
carbon
steel
and
ions
represent
a
crucial
aspect
design
new
inhibitors.
Theoretical
studies
based
molecular
mechanic
(MM)
dynamic
(MD)
methods
have
proven
useful
research
formation
passive
films
intermolecular
interactions
with
ions,
both
under
dry
hydrated
conditions,
allowing
for
further
comparison
experimental
data.
In
this
study,
glutamate-
tartrate-based
inhibitor
investigated.
After
MM/MD
simulations,
found
be
kept
away
from
via
electrostatic
repulsion,
hence
remaining
distant
lepidocrocite
γ-FeO(OH)
surface.
These
coatings
able
efficiently
adsorption
penetration
due
presence
COO−
groups,
which
electrostatically
dynamically
repel
chlorides
over
time.
Even
coatings,
when
complete
coverage
solid
surface
occurs,
these
OCIs
good
potential
candidates
preventing
corrosion;
however,
water,
across
can
occur,
thus
rendering
them
relatively
less
effective.
Coatings,
Год журнала:
2025,
Номер
15(1), С. 93 - 93
Опубликована: Янв. 15, 2025
In
production
and
transportation
systems
of
the
oil
industry,
brine
solutions
contain
high
concentrations
chloride
dissolved
CO2,
which
is
a
very
corrosive
medium
to
carbon
steel
exposed.
Therefore,
finding
new
effective
environmentally
friendly
corrosion
inhibitors
great
importance.
The
effect
CeCl3
(in
from
5
mg
dm−3
20
dm−3)
oleic
acid
imidazoline
(IOA)
separately
their
mixtures
15
IOA)
as
AISI
1018
in
simulated
solution
saturated
with
CO2
at
60
°C
were
examined
by
means
weight-loss
testing,
electrochemical
measurements
(polarization
resistance,
linear
polarization
Tafel
extrapolation,
impedance
spectroscopy)
surface
analyses
(scanning
electron
microscopy
energy-dispersive
X-ray
spectroscopy
analyses,
Raman
diffraction).
All
test
methods
showed
higher
efficiency
compounds′
(from
62.77%
97.94%)
degree
protection
compared
action
individual
compounds
(efficiency
3.43%
94.61%
for
IOA
57.58%
96.27%
CeCl3).
Imidazoline,
common
inhibitor
CO2-saturated
systems,
most
likely
forms
film
voids
via
its
adsorption
on
surface,
while
cerium
carbonate
tends
fill
these
creating
more
compact
film.
this
way,
denser
thicker
formed.
Polymers,
Год журнала:
2025,
Номер
17(3), С. 422 - 422
Опубликована: Фев. 5, 2025
Polymer
corrosion
inhibitors
are
reported
to
form
dense
films
on
carbon
steel
surfaces,
and
their
thermostability
enables
survival
in
harsh
downhole
environments.
In
this
paper,
PEG-OTs
was
synthesized
by
mechanochemistry
using
ball
mill
grafting
tosyl
PEG.
Using
solvent-free
green
chemistry,
non-toxic
PEG
with
various
molecular
weights
(600,
2000,
10,000
g/mol)
were
prepared
used
as
inhibitors.
The
inhibition
performance
of
5
×
10−3
mol/L
Q235
0.5
M
HCl
solution
investigated
static
weight-loss,
electrochemical
impedance
spectroscopy,
polarization
curves,
SEM,
contact
angle
measurements.
results
show
that,
after
modification,
has
an
elevated
effect
compared
A
maximum
90%
efficiency
achieved
weight-loss.
morphology
study
shows
that
a
film
formed
protect
steel.
Thanks
polymeric
structure,
higher
weight
leads
better
inhibition.
