Özet
The main purpose of the presented thesis is to synthesize and characterize Smart Halloysite
Nanotubes for use in anti-corrosion coatings. When we look at the sectors directly and
indirectly affected by corrosion, many fields such as aviation, energy, chemistry, food, oil and
gas, pharmacy, machinery and civil engineering can be listed. Today, the aviation sector is the
leading sector when considering safety and speed factors. With the precautions taken during
production and maintenance work, corrosion damage resulting from the harsh conditions in
which the aircraft are found has been tried to be prevented. Material selection and finishing
processes during the design process are important factors affecting the corrosion resistance of
aluminum alloys used in the aircraft body. For this reason, Aluminum 7075 alloy was
preferred as the surface. There are two main approaches to applying smart coatings with self-
healing properties used for anti-corrosion applications. The first method involves localized
repair of the damaged coating by controlled release of polymerizable agents, while the second
method requires electrochemical protection of the exposed metallic substrate using corrosion
inhibitors stored in nanocontainers. In this thesis study, the second method mentioned above
was applied.
Within the scope of the study, aluminum alloy was used as the main material, Halloysite
nanotubes were used as nano containers, and Benzotriazole (BTA) was used as an inhibitor.
iv
The layer-by-layer bonding (LBL) method was applied as an end-stopping system for
nanotubes, and Poly(maleic anhydride-alt-acrylic acid) copolymer was synthesized to be used
in the LBL method. In addition, the calcination process aims to enlarge the inner diameter of
halloysite nanotubes and increase the loading capacity of corrosion inhibitors.
After the calcination of the halloysite nanotubes, BTA loading was carried out on the calcined
and uncalcined nanotubes, and then the BTA-loaded halloysite nanotubes were synthesized
with Poly(maleic anhydride-alt-acrylic acid) copolymer. A study was carried out to improve
the corrosion that occurs on aluminum alloy with the nanotubes formed as a result of
synthesis. In addition, aluminum alloys were coated with nanotubes and then treated with acid
to observe whether they would corrode.
The morphology and properties of the nanocontainers were characterized by scanning electron
microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The amount of
benzotriazole (BTA) loaded in the halloysite lumen was determined by thermogravimetric
analysis (TGA). Additionally, Surface area and pore size (BET) analysis was performed after
loading. Dynamic Mechanical Analysis (DMA) was used to follow the dynamic mechanical
properties of the nanocontainers. The control of the healing of the defective area exposed to
corrosion was illuminated by scanning electron microscopy (SEM-EDX).
Within the scope of the thesis, self-healing structures against corrosion made with the use of
nano-containers can contribute both nationally and internationally, reduce financial losses
especially in the defense industry and other industries, and compete in both our country and
the world market by being non-toxic with the use of environmentally friendly polymers. It is
considered as the original value of the thesis. Additionally, preventing inhibitor leakage with
the layer-by-layer bonding technique increases the success of the system.
Künye
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