Naslov
Crosslinking of self-assembled monolayers of fatty acids by ionising irradiation for corrosion protection of metals

Autori
Marušić, Katarina ; Matijaković, Nives ; Mihaljević, Branka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
14th Tihany Symposium on Radiation Chemistry / - , 2019, O53-O53

Skup
14th Tihany Symposium on Radiation Chemistry

Mjesto i datum
Siófok, Mađarska, 25.05.2019. - 30.05.2019

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
crosslinking ; ionising radiation ; selfassembled monolayers ; copperprotection ; polymer coatings

Sažetak
Copper has been widely used in construction of sculptures and other works of art for ages. When exposed to air a thin oxide layer is formed. This layer offers natural protection to copper. Due to increased environmental pollution copper’s natural protection is not enough. In order to preserve cultural heritage in these conditions it is necessary to apply additional protection from corrosion. Formation of a thin self-assembled protective film (SAM) on the surface of the natural oxide film is a good and practical way to enhance the metal’s natural protective properties. Fatty acids are non-toxic compounds which have an affinity for adsorbing on metals with their hydrophobic end, the carboxyl group. The other end of fatty acids, the methyl group, has hydrophobic properties and when adsorbed on the metal surface it makes the whole surface of the metal appear hydrophobic [1]. Long-chain fatty acid molecules with a trans geometrical configuration because of their specific shape are close-packed on the surface of copper making the coating very compact and water difficult to approach the surface [2]. Self- assembled coatings of fatty acids are convenient to be used on cultural heritage, because they form in very thin layers and do not change the appearance of the surface. Unfortunately, when exposed to urban outdoors fatty acids tend to degrade and desorb from the surface of copper so the protective properties of the SAM are not long- lasting. In this work gamma irradiation was used for crosslinking of the fatty acid SAM on copper. By crosslinking the coating becomes more stable and durable, while it keeps all the advantages of the SAM. The protective properties of the cross-linked coatings were investigated by electrochemical methods (potentiodynamic polarization and electrochemical impedance spectroscopy) in a solution simulating urban atmospheres. The optimal conditions for crosslinking were determined and the properties of the obtained coating were compared to the properties of the non-crosslinked SAM. The coatings were characterized by FTIR and goniometry, while the corrosion products of the different samples after exposure to the simulated urban atmosphere were investigated by SEM and EDS. References [1] K. Marušić, et al., Acta Chim. Slov. 2014, 61, 328. [2] L. H. Dubois, R. G. Nuzzo, Annu. Rev. Phys. Chem. 1992, 43, 437.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

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