Synthesis of hydrotalcites bearing corrosion inhibitors and fabrication of nanocpmposite coatings for corrosion protection of carbon steel

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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