Abstract
Epoxy varnish coatings with different amount of sulfosalicylic acid were prepared on galvanized steel. The adhesion and corrosion performance of the coatings were characterized by means of pull-off adhesion tester and electrochemical impedance spectroscopy (EIS) respectively. While the effect of sulfosalicylic acid on the corrosion resistance of the coatings was also studied in 3.5%NaCl solution. The results show that with the increasing amount of sulfosalicylic acid, the ad- hesive strength of the coatings increases firstly, and then decreases. Among others, the coating with 3% (mass fraction) sulfosalicylic acid exhibits the highest adhesive strength, modules at low fre- quency and pore resistance during the immersion process only except for the initial stage; as well as the highest charge transfer resistance. These results show that the epoxy varnish coatings contain- ing 3% sulfosalicylic acid has the best adhesion and corrosion resistance.
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