Inhibiting effect of dithiocarbamate on TM 23 bronze alloy corrosion in acid medium

• Published in: Corrosion engineering, science, and technology science, and technology, 2013-06, Vol.48 (4), p.288-293
• Main Authors: D'Ars de Figueiredo, J C, de F. C. Lins, V, de Bellis, V M
• Format: Article
• Language: English
• Subjects: Adsorption; Analytical chemistry; Applied sciences; Aqueous solutions; Bronze; Bronze alloy TM 23; Bronzes; CATHODES; CORROSION; Corrosion environments; Corrosion inhibitor; CORROSION INHIBITORS; Corrosion prevention; Dithiocarbamate; Exact sciences and technology; Inhibition; Metals. Metallurgy; Nitric acid; Quantum chemical calculation; Quantum chemistry; Surface chemistry
• ISSN: 1478-422X; 1743-2782
• DOI: 10.1179/1743278212Y.0000000075

The inhibiting effect of dithiocarbamate (DTC) on bronze alloy TM 23 corrosion in acid medium was evaluated. Dithiocarbamate parabanic and DTC glycoluril were successfully synthesised from parabanic acid and glycoluril respectively. The compounds were characterised using elemental analysis and infrared spectroscopy. Quantum chemical calculations, weight loss test, polarisation curves and adsorption isotherms were performed. Dithiocarbamate parabanic is a more effective inhibitor of bronze alloy TM 23 than DTC glycoluril in an aqueous solution of nitric acid. Quantum chemical calculation indicated that these inhibitors interact with bronze alloy surface through dithiocarbamate groups. The two substances studied, DTC parabanic and DTC glycoluril, act as inhibitors cathode for bronze alloy TM 23 in 0·1 mol L −1 nitric acid. The adsorption of these inhibitors on bronze alloy TM 23 surface in acid media follows the Langmuir adsorption isotherm.