|
Abstract:
|
Magnetite
thin
film
obtained
from
the
hot
alkaline
nitrate
blackening
method
is
been
utilized
for
the
protection
of
the
surface
of
steel.
This
study
aims
to
investigate
the
effect
of
varying
some
parameters
for
instance,
blackening
bath's
nitrate
concentration,
temperature
and
dwell
time
on
the
properties
of
the
magnetite
coating,
especially
that
of
wears
resistance.
In
order
to
produce
the
magnetite
coating,
mild
steel
specimens
were
placed
in
a
boiling
solution
made
up
of
some
compositions
of
sodium
hydroxide
and
sodium
nitrate
dissolved
in
water.
The
blackened
specimens
were
then
undergoing
some
analysis,
which
are
microstructure
analysis
using
a
reflecting
microscope.
Wear
resistance
analysis
and
tribological
properties
were
also
done,
by
using
the
pin-‐on-‐disk
test.
Consequently
it
was
found
that
the
magnetite
coating
produced
by
oxidation
process
in
the
blackening
experiment,
able
to
improve
the
wear
resistance
and
corrosion
properties
of
the
steel
substrate,
other
than
giving
the
surface
a
beautiful
like
mirror
finishing.
Furthermore
in
this
study,
it
was
found
that
the
best
condition
to
produce
a
good
quality
of
magnetite
coating
on
steel
substrate
is
by
conducting
the
blackening
process
in
30%
of
nitrate
bath
solution
at
140℃
for
15
minutes. |
