Additional file 1 of The synergistic effect of an imidazolium salt and benzotriazole on the protection of bronze surfaces with chitosan-based coatings

Additional file 1.1H NMR spectra of HO2CC1MImCl (Figure S1) and HO2CC1MImNTf2 (Figure S3). 13 C NMR spectra of HO2CC1MImCl (Figure S2) and HO2CC1MImNTf2 (Figure S4). Thickness determination by SEM for CHT and CHT/BTA (Figure S5). ATR-FTIR spectra of CHT/BTA coating on bronze disk before and after 12 h of accelerated corrosion treatment (Figure S6).