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academies
Journal of Industrial and Environmental Chemistry | Volume 2
December 06 -07, 2018 | Dubai, UAE
Pet roleum Engineer ing, Oil and Gas
International Conference on
Joint Event
Self-healing smart anti-corrosion coatings based on polymers and functionalized carbon particles
Ahmad Tabish
Khalifa university of science and technology research center, UAE
The issue of corrosion is a well-known problem and it causes
the weakening of metal and its properties and makes it
unfit for use. Corrosion causes enormous economic losses
consistently over years in equipment maintenance, repair, and
its substitution. In Gulf Cooperation Council (G.C.C) countries,
money spent into corrosion control and repair are extremely
dependent on production of oil, refining and petrochemicals
sector shall be noteworthy as it comprises more than 33% of
gross domestic products. Until now, various coatings have
been developed to tackle this problem like sacrificial coatings,
barrier coatings, noble metal coatings and electrically resistive
coatings. In this study, self-healing smart anti-corrosion
coatings were synthesized as it is a much lesser investigated
area of research. Functionalized particles from meso porous
carbon along with meso porous silica etc. were used as Nano
containers for encapsulation of corrosion inhibitor for self-
healing purpose using layer-by layer (lbl) self-assembly method
and their effect on performance of coatings were studied after
adding in commercially available polymer matrix against the
corrosion of mild carbon steel in seawater. A series of tests
were conducted on the resultant coatings to investigate their
corrosion resistance, self-healing performance etc. This study
will evaluate the protection offered by coatings of commercially
available porous materials against the corrosion of mild steel
in seawater, along with addition of different encapsulated
nano containers in the polymer matrix. Benzotriazole (BTA)
was used as a corrosion inhibitor in this study for synthesizing
Nano containers. Self-healing smart anti-corrosion coatings, is a
much lesser explored area of research with the major challenge
of low adhesion properties and release of Nano containers to
heal the corroded metal substrate. This calls for preparation of
substrate surface and treatment of coatings to establish good
interfacial interaction of the nano containers with the porous
material and their successful release in the medium upon a pH
change to avoid delamination/corrosion of coatings in water.
The potential of the functionalized carbon materials to further
enhance anticorrosion performance of the self-healing coatings
was also evaluated. The coatings were prepared by brush
coatings as well as dip-coating methods in determined optimal
conditions on clean polished mild carbon steel coupons. The
coating degradation behaviour and corrosion resistance was
investigated by the immersion tests (performed in 3.5 wt. %
sodium chloride solution) and Potentiostatic Electrochemical
Impedance Spectroscopy (PEIS). Brunauer–Emmett–Teller
(BET) testing was done only initially in order to determine the
degree of impregnation in the pores of the carbon and silica
materials. Corrosion monitoring was performed using Linear
Polarization (LP) technique. Other nano capsules characteristics
were studied using techniques such as Fourier Transform
Infrared Spectroscopy (FTIR), X Ray Diffraction (XRD) was
used to characterize the composition of the multilayers of
the Nano capsules, Scanning Electron Microscopy (SEM) and
Transmission Electron Microscopy (TEM) were used to analyze
the surface morphology of coatings as well as nano capsules.
The visual appearance of coating and corrosion products was
studied using Optical Microscopy (OM). Coating thickness
measurements were done using a standard PosiTector gauge.
Zeta Potential was also analyzed continuously during the
synthesis of nano capsules in order to optimize the layer-by-
layer assembly of a self-healing coating. Ultraviolet–visible
spectroscopy (UV-Vis) was also studied to analyze the release
behavior of the synthesized Corrosion Inhibitor encapsulated
Nano containers in different pH of water. Self-healing testing of
the synthesized coatings based on ASTM D7027-13 standards
was also carried out to analyze the coating performance when
exposed to corroding conditions.
The electrochemical impedance spectroscopy (EIS) results
illustrated the improved corrosion resistance of the coating
based on carbon materials. The proposed coating also had a
rapid self-healing ability in the presence of water. The meso
porous carbon based coatings produced, were highly stable
and protective in nature. The self-healing coatings possessed
high impedance good barrier characteristics. The meso porous
carbon and functionalized meso porous carbon coatings were
comparedwith coatings of meso porous silica and commercially
availablevinylacrylate.TheSEManalysisalsorevealedsuccessful
release of BTA onto the corroded surface thus verifying the self-
healing effect. UV-Vis predicted that the carbon based capsules
hadmore impregnation of the corrosion inhibitor than the silica
based nano containers. It was observed that carbon based
coatings and its 5 wt. % composition in the polymer matrix had
better anticorrosive performance and adhesion than the silica
coatings and provided much greater substrate protection as
explained in the work in detail.
e:
Oil & Gas 2018 &
Petroleum Engineering 2018, Volume 2
DOI: 10.4066/2591-7331-C2-006