| Summary: | The aim of the present research work is to study the first stages of the deterioration of lacquered tinplate containers, used in the local market, exposed to solutions that simulate the filler liquid of canned regional products. The samples were analyzed using electrochemical impedance spectroscopy (EIS), optical microscopy and porosity tests. Evaluations were performed on commercial tinplate cans protected by int epoxy-phenolic varnish, exposed to solutions of 3 % NaCl in citric acid, pH=3 and pH=5. The electrochemical response of the system, obtained at different times, was analyzed using models that suitably describe the physico-chemical processes for the system under study. The information is compared with that obtained by optical microscopy, complemented with porosity tests, in order to evaluate the deterioration of the package. The results obtained show that while varnish type 2 has good performance, varnish type 1 is not suitable to be used with the tried solutions. Its deterioration is detected first by the changes in the EIS answer and later confirmed by microscopy and continuity tests.
|
|---|
Corrosion Rates Evaluation of Stainless Steels in Soy Biodiesel Using Different Techniques