Naslov
The influence of the type of fatty acid crosslinked on copper on its protective properties in atmospheric conditions.

Autori
Pezić, Ena ; Pucić, Irina ; Otmačić Ćurković, Helena ; Mihaljević, Branka ; Marušić, Katarina

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

Skup
Second International Conference on Applications of Radiation Science and Technology (ICARST-2022)

Mjesto i datum
Beč, Austrija, 22.08.2022. - 26.08.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
copper ; coatings ; fatty acids ; self-assembled monolayers (SAMs) ; radiation crosslinking

Sažetak
Background of the study. Copper is a malleable and ductile metal with numerous advantages and a wide range of applications. To protect it copper surface may be coated. Many of the different coatings used are unsafe for the environment so the development of protective coatings that satisfy environmental requirements is a serious scientific challenge. Fatty acids are long chain molecules and non-toxic compounds that spontaneously form self-assembled monolayers (SAMs) on metal surface. Fatty acid SAMs are hydrophobic and block water access to the metal. However, the main flaw of SAMs coatings for corrosion protection is that they get relatively easily desorbed in corrosive conditions. That problem may be solved by crosslinking SAM film consisting of unsaturated fatty acids but most of the agents used for classical crosslinking are toxic. By radiation crosslinking toxic agents are avoided and more durable and stable SAMs films that retain numerous advantages are obtained. The protective efficiency of coatings developed this way depends on the type of fatty acid used, preparation conditions, and the environment metal is exposed to. In this work, the protective efficiency of coatings prepared with different unsaturated fatty acids is compared. Methodology. SAMs on the copper surface were obtained of several unsaturated trans-fatty acids with different positions of the single double bond. The SAMs were then irradiated with gamma radiation to selected absorbed doses. The radiation effects on the coatings were assessed by FTIR, their hydrophobicity was tested by contact angle goniometry. Protective properties of irradiated coatings were investigated by electrochemical methods in a solution simulating urban atmospheres. Polarization methods were used to determine the optimal crosslinking doses and electrochemical impedance spectroscopy was used to study the long-term behavior of the coatings. Results and conclusions. While all studied SAMs coatings offer good protective properties to copper in atmospheric conditions after irradiation the properties are significantly improved. Upon irradiation to appropriate doses, the SAMs can be efficiently crosslinked what increases their stability and protective properties. Upon irradiation, the protective efficiencies of all the coatings increase significantly offering protection. We thank the Croatian Science Foundation (HRZZ IP- 2020-02-4344) for supporting the research.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

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