Results in Surfaces and Interfaces,
Journal Year:
2024,
Volume and Issue:
16, P. 100243 - 100243
Published: June 22, 2024
Chemical
conversion
coating
(CCC)
is
a
cost-effective
and
industrially
scalable
technique
to
tackle
the
issue
of
corrosion
Magnesium
its
alloys,
crucial
for
reducing
global
greenhouse
gas
emissions
by
road
transportation
sector.
Amongst
all
possible
CCCs,
phosphate
(PCC)
has
one
highest
industrial
application
potential.
This
article
demonstrates
limitations
in
traditional
understanding
Mg-PCC
mechanism,
primarily
dictated
increased
local
pH
near
Mg-substrate
leading
double
deprotonation
phosphoric
acid
(H3PO4
→
H2PO4-
+
H+;
HPO42-
H+).
The
further
reacts
Mg2+
subsequent
supersaturation
precipitate,
MgHPO4.3H2O
results
formation.
new
hypothesis
proposed
based
on
argument
that
second
reaction
energetically
unfavorable,
instead,
mostly
limited
first
resulting
H2PO4-.
forms
an
intermediate
complex
ion,
(Mg2+-H2PO4-)+.
Mg
substrate,
when
exposed
aqueous
environment,
releases
Mg2+,
negatively
charged
substrate.
(Mg2+-H2PO4-)+
ions
are
electrostatically
attracted
substrate
responsible
MHPT
(MgHPO4.3H2O)
coating.
supported
thermodynamic
calculations
through
density
functional
theory
(DFT)
experiments.
Journal of Magnesium and Alloys,
Journal Year:
2023,
Volume and Issue:
11(10), P. 3585 - 3608
Published: Oct. 1, 2023
Featuring
low
density
and
high
specific
strength,
magnesium
(Mg)
alloys
have
attracted
wide
interests
in
the
fields
of
portable
devices
automotive
industry.
However,
active
chemical
electrochemical
properties
make
them
susceptible
to
corrosion
humid,
seawater,
soil,
medium.
Various
strategies
revealed
certain
merits
protecting
Mg
alloys.
Therein,
engineering
self-repairing
coatings
is
considered
as
an
effective
strategy,
because
they
can
enable
timely
repair
for
damaged
areas,
which
brings
about
long-term
protection
In
this
review,
on
are
summarized
from
two
aspects,
namely
shape
restoring
function
coatings.
Shape
benefit
swelling,
shrinking,
or
reassociating
reversible
bonds
return
original
state
morphology
when
broken;
depend
release
inhibitors
generate
new
passive
layers
areas.
With
advancement
coating
research
fulfill
demanding
requirements
applications,
it
inevitable
trend
develop
that
integrate
multiple
functions
(such
stimulus
response,
self-repairing,
warning,
so
on).
As
a
novel
carrier
barrier,
porous
solids,
especially
covalent
organic
frameworks
(COFs),
been
respected
future
development
alloys,
due
their
unique,
diverse
structures
adjustable
functions.
Heliyon,
Journal Year:
2024,
Volume and Issue:
10(4), P. e24348 - e24348
Published: Jan. 11, 2024
Magnesium
and
its
alloys
are
considered
excellent
materials
for
biodegradable
implants
because
of
their
good
biocompatibility
biodegradability
as
well
mechanical
properties.
However,
the
rapid
degradation
rate
severely
limits
clinical
applications.
Plasma
electrolytic
oxidation
(PEO),
also
known
micro-arc
(MAO),
is
an
effective
surface
modification
technique.
there
many
pores
cracks
on
coating
under
conventional
PEO
process.
The
corrosive
products
tend
to
penetrate
deeply
into
substrate,
reducing
corrosion
resistance
biocompatibility,
which
makes
PEO-coated
Mg
difficult
meet
long-term
needs
in
vivo
implants.
Hence,
it
necessary
modify
coating.
This
review
discusses
formation
mechanism
influential
parameters
coatings
Mg.
followed
by
a
latest
research
pretreatment
typical
amelioration
past
5
years,
including
calcium
phosphate
(Ca–P)
coating,
layered
double
hydroxide
(LDH)-PEO
ZrO2
incorporated-PEO
antibacterial
ingredients-PEO
drug-PEO
polymer-PEO
composite
fluorination
(PEF)
self-healing
Meanwhile,
improvements
morphology,
resistance,
wear
abilities,
drug
loading
abilities
preparation
methods
modified
discussed
well.
Finally,
challenges
prospects
detail
purpose
promoting
application
alloys.
Smart Materials in Manufacturing,
Journal Year:
2023,
Volume and Issue:
1, P. 100022 - 100022
Published: Jan. 1, 2023
With
promising
mechanical
property
and
biodegradability,
magnesium
(Mg)
alloys
are
considered
as
the
potential
candidates
in
biomedical
application.
Rapid
degradation
of
Mg
compromises
performance
interfacial
bioactivity,
hindering
clinical
adoption.
Deposition
a
surface
coating
is
an
effective
technique
to
improve
corrosion
protection
bio-efficacy
implants.
Because
natural
degradability
corrosion,
inevitably
damaged
complex
physiological
environment.
Therefore,
it
essential
form
self-healing
that
can
repair
damage
restore
stable
structure
functions
alloys.
This
paper
reviews
recent
advances
technology
related
properties
including
biodegradation
behavior,
self-repairing
activity,
biocompatibility,
other
biological
effects,
healing
mechanism
discussed.
Self-healing
coatings
suitable
for
include
conversion
coatings,
encapsulation
multilayered
their
vitro
vivo
reviewed
by
focusing
on
drug-controlled
prolonged
release,
sterilization,
cytocompatibility,
osteogenesis,
hemocompatibility,
angiogenesis.
review
aims
at
providing
guidance
future
research
development
practical
