Fast Evaluation of Resistance to High Temperature Steam Sterilization Process for Organic Coating Coated Tinplate by Electrochemical Method
The resistance to high temperature steam sterilization process of tinplate coated with polyester,epoxy-phenolic and epoxy-amino coating respectively was studied by cathodic polarization and electrochemical impedance spectroscopy(EIS),and then the relevant mechanism was also discussed.The results showed that the cathodic polarization current can effectively distinguish the protective properties of coated tinplate for food packaging,and the higher the cathodic polarization current,the worse the protective properties of the coating.The corrosion resistance of epoxy phenolic coating is the best,followed by the epoxy amino paint,and that of polyester coating is the worst.After high temperature steam sterilization at 127℃ for 1 h,the protection performance of the coated tinplate in 3.5％NaCl solution decreased,and the low-frequency impedance modulus decreased,namely the minimum value was 5.4％and the maximum was 69.7％.Overall,the resistance to high temperature steam sterilization of the three coatings was similar.The bonding strength between the coating/tinplate and the wettability of the coating were the main parameters that affect its resistance to high temperature steam sterilization process.The better the bonding strength and the worse the wettability of the coating,the better the resistance to the high temperature steam sterilization process.
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