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Electrochemical Study of Lacquered Tinplate and Aluminium Cans Performance

Electrochemical methods are often used to study the protective characteristics of organic coatings on the metal substrate. DC and AC measurements were performed on lacquered tinplate and aluminium cans aimed for carbonated drink packaging. Redox potential (rH), and pH of carbonated beverage were determined. Similar corrosion current values were obtained for tinplate (0.15 - 0.8 nA cm-2) and aluminium cans (0.17 - 0.41 nA cm-2). The resistance of the coatings exceeded 108 W cm2 and did not change much after seven days of being exposed to an electrolyte. A suitable well fitting linear correlation, in case of the aluminium cans was found between i corr and dissolved aluminium (r = 0.9227). As for the tinplate cans an excellent correlation was found between the i corr and dissolved Fe ions (r = 0.9353) as well as dissolved Sn ions (r = 0.9574). Good correlation exist between several electrochemical parameters: Rp / i corr (r = 0.5210); Rp / E corr (r = 0.6738) and E corr / C po (r = -0.6958).

Aluminium; Tinplate; Electochemistry; AC/DC measurements

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