Evaluation of 2-(salicylideneimino) thiophenol and other Schiff bases as bronze corrosion inhibitors by electrochemical techniques and surface analysis

Cecilia Monticelli (1) , Andrea Balbo (1) , Jérôme Esvan (2) , Cristina Chiavari (3) , Carla Martini (3) , Federica Zanotto (1) , Lorenza Marvelli (1) , Luc Robbiola (4)

1 UniFE - Università degli Studi di Ferrara = University of Ferrara
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 UNIBO - Alma Mater Studiorum Università di Bologna = University of Bologna
4 TRACES - Travaux et recherches archéologiques sur les cultures, les espaces et les sociétés

n this research, different Schiff bases were synthesized and tested as bronze corrosion inhibitors in concentrated synthetic acid rain at pH 3.3. Some of them showed good inhibiting effects, as detected by EIS and polarization curve recording. The most efficient inhibitor (2-(salicylideneimino) thiophenol, SITP) was also tested with ad-dition of sodium dihydrogen phosphate (P). P improved the surface film resistance against breakdown phe-nomena. XPS and SEM investigations showed that SITP and SITP + P significantly hinder decuprification. Moreover, SITP forms a protective layer on bronze, composed of both Cu(I)-SITP complexes and adsorbed in-hibitor molecules. Cu(II) phosphates were also detected with P addition.

Mots clés: Bronze; Corrosion inhibitor; Schiff bases; EIS; XPS

Domaines: Matériaux; Matériaux

Cecilia Monticelli, Andrea Balbo, Jérôme Esvan, Cristina Chiavari, Carla Martini, et al.. Evaluation of 2-(salicylideneimino) thiophenol and other Schiff bases as bronze corrosion inhibitors by electrochemical techniques and surface analysis. Corrosion Science, 2019, 148, pp.144-158. ⟨10.1016/j.corsci.2018.12.017⟩. ⟨hal-03033080⟩