Abstract
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 (HO2CC1MImNTf2) 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 HO2CC1MImNTf2 was less effective than the one with benzotriazole. The coating with a combination of HO2CC1MImNTf2 and benzotriazole resulted in the optimal protective efficacy of the bronze surface, and it also maintained high transparency without changing the bronze appearance.
Highlights
Corrosion phenomena affecting metal surfaces exposed in polluted environments represent a serious global problem in several areas [1]
HO2CC1MImCl (Scheme 1) was obtained as white solid and the two-step synthesis resulted in 92% yield
The recorded 1H (Additional file 1: Figure S1) and 13C Nuclear magnetic resonance (NMR) (Additional file 1: Figure S2) spectra are in agreement with the data published previously [35]
Summary
Corrosion phenomena affecting metal surfaces exposed in polluted environments represent a serious global problem in several areas [1]. To the best of our knowledge, this preliminary study on the active protection of bronze alloys with CHT-based coatings modified with BTA and the IS HO2CC1MImNTf2 is innovative and similar uses of IS in cultural heritage were not reported so far.
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