Abstract
An electrochemical sensor is developed to evaluate the shelf life of lacquered tinplate cans by using open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiostatic step techniques. The voltage and current detection precision of measurement system are 0.25 mV and 500 pA. The evolution of OCP, coating resistance, charge transfer resistance, and current response after potentiostatic step can be used as indicators for shelf life evaluation. Through establishing the electrochemical equivalent circuits (EECs), the change of the corrosion resistance over time is formulated and its correlation with shelf life is elucidated. The results show that electrochemical methods are successfully applied in fast shelf-life assessment of metal packaging cans.
Published Version
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