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.
