The synergistic effect of an imidazolium salt and benzotriazole on the protection of bronze surfaces with chitosan-based coatings

• Published in: Heritage science Vol. 8; no. 1; pp. 1 - 14
• Main Authors: Silva da Conceição, Debora Kelen, Nunes de Almeida, Kauana, Nhuch, Elsa, Raucci, Maria Grazia, Santillo, Chiara, Salzano de Luna, Martina, Ambrosio, Luigi, Lavorgna, Marino, Giuliani, Chiara, Di Carlo, Gabriella, Staccioli, Maria Paola, Falcade, Tiago, Schrekker, Henri Stephan
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 22-04-2020; Springer Nature B.V; SpringerOpen
• Subjects: Additives; Anticorrosive; Benzotriazole; Biopolymer matrix; Bronzes; Chemistry and Materials Science; Chitosan; Coatings; Copper base alloys; Copper-based alloy artifact; Corrosion prevention; Cultural heritage; Cultural resources; Ionic liquid; Materials Science; NANORESTART: Nanomaterials for the restoration of works of art; Research Article; Substrates; Synergistic effect; Anticorrosive; Copper-based alloy artifact; Biopolymer matrix; Ionic liquid
• ISSN: 2050-7445; 2050-7445
• DOI: 10.1186/s40494-020-00381-4

The class of imidazolium salts contains effective anticorrosion additives for metal substrates. This study evaluated the potential of 1-carboxymethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (
HO
2
CC
1
MImNTf
2
) for application in cultural heritage, exploring it as anticorrosion additive in chitosan-based coatings for the protection of copper-based alloys. Under accelerated corrosion conditions with HCl vapor, the chitosan coating with
HO
2
CC
1
MImNTf
2
was less effective than the one with benzotriazole. The coating with a combination of
HO
2
CC
1
MImNTf
2
and benzotriazole resulted in the optimal protective efficacy of the bronze surface, and it also maintained high transparency without changing the bronze appearance.