AN IMPEDANCE STUDY ON THE CORROSION PROPERTIES OF LACQUERED TINPLATE CANS IN CONTACT WITH TUNA AND MUSSELS IN PICKLED SAUCE

Tinplate cans internally coated with two commercial epoxyphenolic lacq uers were studied. Tuna and mussels in pickled sauce and an acetic mod el were used as electrolytes. EIS and polarization experiments were co nducted at different time periods up to 150 days. Tin and iron dissolu tion was determined by atomic absorption spectrophotometry. Similar re sults were yielded by the three experimental techniques employed. The lacquer system with the greatest weight, constituted by a primer of ep oxyphenolic lacquer (3-4 g/m(2)) and a topcoat of organosol lacquer (1 2-15 g/m(2)), showed good corrosion resistance For canned tuna and mus sels in pickled sauce. (C) 1998 Elsevier Science Ltd. All rights reser ved.