Anti-corrosion properties of silicon dioxide epoxy composite coatings

In a new study, the meso-silicon dioxide nanoconsumer (MS) was successfully synthesized, functionalized and loaded with sodium tantalum as an corrosion inhibitor (MSInh).
applied to a low-carbon steel substrate by embedding a 1wt% epoxy composite coating. % meso-porous silica is associated with (E/MSInh) or non-E/MS inhibitors
chinese
. The symptoms of synthetic meso-silicon dioxide loaded with palladium have demonstrated the pH dependence of the palladium salt released from E/MSInh. According to the results, a 160-fold increase in the concentration of palladium acid in the solution was observed by increasing pH from 1 to 14.
anti-corrosion
the corrosion behavior of composite coatings is evaluated through electrochemical impedance spectrum and electrochemical noise analysis. During immersion time, the charge transfer resistors of E/MSInh and E/MS were reduced from 4×107 to 3.1×104?cm2, and from 2.2×106 to 2×103?cm2, respectively× The results showed that after 56 days of immersion, E/MSInh was more resistant to corrosion, at 3.5% (weight). Compared to E/MS, the %NaCl solution confirms the appropriate corrosion inhibition of the released root ions.
the study was published last year:
 Progress in Organic Coatings Volume 126, January 2019, Pages 18-27.
Summary
corrosion is one of the most common and critical issues observed in many industries
, such as

oil and gas

, water treatment, etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. To solve this
,
protective coatings have been widely used to reduce corrosion of
substrates
.
different types of coatings, where polymer coatings are widely used.
, however









, these coatings are prone to destruction and corrosion

.
Although this is a new way to increase
's corrosion resistance

coatings are
doped with
corrosion inhibitors
, which can lead to the loss of corrosion inhibitors and their adverse interaction with the coating in a
relatively
short period of time.
to minimize these problems, corrosion inhibitors are filled into inorger particles embedded in the coating substation as fillers . . .








. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . Most recently, particulates or
nanocapsules
,

,
,
,
,
,
,
,

ion exchange species,
,

,
,
,
,
,
21,
,
,
,

,

, layer-by-layer
-polyelectrogen
shell,
,
,

.
,

,

,
,
,
,
, and br
the
of the
,

,

,
, 34,
,
,
, has been used as a host for corrosion inhibitors in which
of the meso-silicon dioxide
particles have received great
attention


.
material has some unique features, such as honeycomb-shaped hexagonal holes with an inner diameter of 2-50nm and a high surface area (700-1500 m
2
g
-1
), large
hole volume
(1 cm
3
g
- 1
), high chemical stability, easy to
36
).
, in order to control the release of anti-corrosion substances, the researchers are committed to the loading of
7
,

,
,
,

,
,

,
,
,
,
,

,
,

,
, 45,
, or inoror
,
,
,
,
,
,
,


,
the
inhibitors enter the pores of the meso-porous silicon dioxide particles in different ways, such as decompression and direct loading of the
31
, the functional process of the
48
), using polyelectrogens ,
28
, as well as the application of
switch
,
,
,
,
.
, although premature leakage is inhibited by surface treatment of meso-porous silica in some technologies, it remains a major concern in direct loading techniques.
addition, in order to load inhibitors

, the surface of the nanocase can be further processed by changing the pH
, redox


, voltage, or their combination.
, for example, Borisova et al.
by successfully loading 1H-benzene triamcinol (as an corrosion inhibitor) into porous interforous silicon dioxide and applying a mixture of
sol- gels
SiO
x
/ZrO
x
composite layer
, an increase in corrosion resistance of
aluminum alloys
AA2024
has been observed.
contains inhibitors in the meso-
31
. Instead, the loss of
anti-corrosion
efficiency of a coating containing a very high load of 2--based benzodialumide in the mid-hole
silica was
reported. In addition, Zea et al. Indicates an increase in corrosion resistance of the sol-gel coating
due to the presence of sodium phosphate into the interstitial silicon dioxide nano-container in the presence of the coating substrate .
51
,
52
).
In another work, the release of 8-hydroxyquinone controlled from sub-micron meso-porous silica particles was measured as a function of the solution pH, indicating that the meso-porous silica of the load inhibitor could be used to synthesize an intelligent anti-corrosion coating
44
).
It is worth mentioning that although electrochemical noise technology has been extensively studied in determining the corrosion resistance of the coated metals

, there is still a lack of information on electrochemical noise data in intelligent coatings ,


55
,
56
.
in this study,

-intelligent
corrosion suppression
systems were
prepared by embedding
-porous silica particles of
-load
vanadiate into the epoxy coating. Since the mid-hole silica particles do not have active bits for use as smart nanoconsumes, they need to be normalized by various materials such as alkyl silane reagents. Thereafter, the resulting cation bits promote adsorption of anions (e.g. niobate) on the surface of silicon dioxide in the middle hole. In this work, palate, as a corrosion inhibitor, produces
of
's
stificity
through the interaction between
corrosion inhibitors and Fe .
.
, the epoxy coating containing and containing silica, which contains and does not contain niobium, is applied to the low carbon steel substrate.
synthetic coating
the
electrochemical corrosion performance
3.5 weight. By moving
the electron polarization
,
electrochemical impedance spectrum
and electrochemical noise method
semporify % NaCl solution
. The results showed that the corrosion resistance of epoxy resin coating increased when the meso-silicon dioxide nanoconsumer containing corrosion inhibitors was embedded in the coating substitum. In addition, in this work, consistency between electrochemical noise data and other electrochemical techniques was reported.