Corrosion of metal causes great damage to the economy of countries
in the world as well as in Vietnam, so the corrosion protection of metals is
very necessary.
Organic coatings are widely used for corrosion protection of metal
structures. Pigment inhibits corrosion in paint film plays an important role
in ensuring the anti-corrosion protection of coatings. Chromates are the
best inhibitive pigments, but due to their high toxicity and unfriendly to the
environment, it is increasingly limited in their use. There have been many
research to study the replacement of chromates in organic coatings by nontoxic pigments and additives. One of atractive researchs is the fabrication
of inhibitive pigments based on hydrotalcite. The application of
hydrotalcites is based on their ability to absorb and exchange anion, and
flexibility of anions between the layers.
The coatings containing hydrotalcites bearing organic anions such as
benzotriazolate and oxalate have also been studied. In addition,
hydrotalcites containing decavanadate, vanadate have been studied and
applied in the anti-corrosion protection coating for aluminum and
magnesium alloys. However, these coatings are not as protective as the
coatings containing chromates.
The protective properties of organic coatings containing
hydrotalcites depend on the dispersion of hydrotalcite in the polymer
matrix. To improve the dispersion of hydrotalcite in the polymer matrix,
silane compounds are used to modify the hydrotalcite surface. In addition,
the presence of silane improves the adhesion between film containing
hydrotalcite bearing corrosion inhibitor and metal surfaces.
Therefore, the title of thesis is “Synthesis of hydrotalcites bearing
corrosion inhibitors and fabrication of nanocomposite coatings for corrosion
protection of carbon steel”. This work contributes to the development of
metal anti-corrosion protection coatings
