Micro/nanocapsules for anticorrosion coatings

Telegdi, Judit and Shaban, Abdul and Vastag, Gyöngyi (2018) Micro/nanocapsules for anticorrosion coatings. In: Fundamentals of Nanoparticles: Classifications, Synthesis Methods, Properties and Characterization. Elsevier, Amsterdam, pp. 521-551. ISBN 978-0-323-51255-8

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Abstract

In the last decade, the interest in the self-healing and slow release coatings applied against corrosion increased dramatically as it helps to expand duration of coating and, at the same time, to increase the structural materials’ life. In these types of paints are micro and nanoncapsules that enable the reparation of the coating upon exposure to external stimuli like mechanical degradation, changes in the pH and/or temperature. In spite of the extensive laboratory research work, there are many unsolved problems in understanding the function of smart coatings. To summarize the knowledge accumulated up-to-now in this topic will help both academic and industrial specialists to keep in center of interest for further research to solve problems that will result in development of more effective micro- and nanocontainers for different paints. Coatings with micro- and nano-containers/capsules improve the basic coating characteristics like anticorrosion efficiency.The chapter first discusses the importance of self-healing and slow release phenomena, and then it focuses on the basic knowledge of micro- and nano-capsule preparation techniques as well as on the importance of “filled” capsules. Advances on preparation of different types of the containers (organic, inorganic, and multilayer) are reviewed. Then the shell and wall materials, the wall thickness and its mechanical properties is discussed as one of the most important questions. One must keep in mind that the capsules must remain intact for years during storage, coating formulation and application and, additionally, in the dry coating. Experimental techniques used for characterization of micro/nanocapsules (size, size distribution, mechanical stability etc.) are discussed.

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