Naslov
Application of Self-Assembled Monolayers of Long- Chain Organic Acids in the Corrosion Protection of Bronze

Autori
Mikić, Dajana ; Otmačić Ćurković, Helena

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

Izvornik
Metal 2019, PROCEEDINGS OF THE INTERIM MEETING OF THE ICOM-CC METALS WORKING GROUP / Chemello, Claudia ; Brambilla, Laura ; Joseph, Edith - : International Council of Museums – Committee for Conservation and Haute Ecole Arc Conservation-restauration, 2019, 458-458

ISBN
978-92-9012-458-0

Skup
28th International Conference on Metallurgy and Materials (METAL 2019)

Mjesto i datum
Neuchâtel, Švicarska, 02.09.2019. - 06.09.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
bronze, corrosion, self-assembled monolayers

Sažetak
One of the challenges today’s chemical engineers face is to find environmentally and economically acceptable solutions to protect against metal corrosion. With regard to bronze sculptures, this challenge is even greater due to the special requirements of the conservation and restoration profession and the necessity to preserve a sculpture’s original appearance. Taking all of these requirements into account, the great potential for application in this field are self-assembled monolayers of long-chain organic acids that are formed by adsorption of acid on the surface of oxide-covered metal, resulting in an acid-base reaction between metal oxide and acid. This reaction is followed by the self- organization of alkyl chains that creates a very thin and compact protective film on the metal surface, thus preventing the penetration of water molecules and aggressive ions. The aim of this work was to examine the efficiency of self-assembled monolayers of 16- phosphonohexadecanoic acid (COOH-PA), obtained using various preparation methods, in protecting bronze surfaces. In addition, the ability of self-assembled monolayers to improve adhesion between transparent organic coatings (Paraloid B- 72) and bronze surfaces was also investigated. Electrochemical measurements were conducted to test the protective properties of COOH-PA monolayers on bronze surfaces using linear polarization and electrochemical impedance spectroscopy. These measurements were carried out in simulated acid rain (0.2 g/L NaNO3 + 0.2 g/L Na2SO4 + 0.2 g/L NaHCO3 at pH 5) to replicate the kind of rain common in urban atmospheres. In addition to electrochemical testing, the properties of the protective films obtained were examined by infrared spectroscopy analysis with Fourier signal transformation, goniometry, and scanning electron microscopy.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA