Naslov
Phosphonic Acids Modification of Patinated Bronze for Enhanced Corrosion Protection by Waterborne Coating

Autori
Kapitanović, Angela ; Otmačić Ćurković, Helena

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

Izvornik
ISE Regional Meeting 2022. / - , 2022, 1-1

Skup
First Regional Meeting of the International Society of Electrochemistry

Mjesto i datum
Prag, Češka Republika, 15.08.2022. - 19.08.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
sulphide patina ; waterborne coating ; self-assembled monolayers ; impedance

Sažetak
Self-assembled monolayers represent an innovative approach in corrosion protection. Long-chain phophonic acids possess self-assembling properties as they bind, with their phosphonic head group, on the metal surface, while their long tails form dense packed self-assembled monolayers due to van der Walls interactions. In this way, the penetration of the aggressive ions and molecules from the environment (water, oxygen, pollutants) to the metal substrate is significantly decreased. The tail group, directly in contact with the environment or coating, also determines properties of the modified surfaces. In other words, phosphonic acids are used for modification of the substrate surface, changing their chemical and physical characteristics. Choice of the tail groups and the molecule chain length are critical factors that will define surface properties. The waterborne coatings are eco-friendly, non- toxic coatings in accordance with the new legislative. They are investigated with the purpose to replace solvent-based organic coatings for the protection of cultural heritage. Combination of these two innovative approaches, self-assembled monolayers and waterborne coatings, is examined in this work as the new solution for the corrosion protection of bronze objects of art, which are very important cultural heritage. The aim of this study is to determine the level of protection offered by acrylic waterborne coating and can it become more effective by using phosphonic acids as corrosion inhibitors. In this work, the impact of variety phosphonic acids on the corrosion protection by waterborne coating on patinated CuSn6 bronze is examined. Obtained level of protection is compared to the waterborne coating without phosphonic acid pretreatment. The electrochemical properties of coated bronze samples continuously immersed in simulated acid rain pH=5 are investigated using electrochemical impedance spectroscopy (EIS). The structure of the coating is determined with Fourier transform infrared spectroscopy and optical microscopy.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA