Sepehr Lajevardi Esfahani - Faculty of surface coatings and novel technologies, institute for color science and technology, Tehran,Iran
Zahra Ranjbar - Faculty of surface coatings and novel technologies, institute for color science and technology, Tehran,Iran- Center of excellence for color science and technology, Tehran, Iran
Saeed Rastegar - Amirkabir university of Technology,polymer and color engineering faculty,Tehran,Iran

Cathodic electrocoatings were applied on phosphated normal and galvanized steel substrates with average dry film thickness of 20 μm. To evaluate of anti-corrosion aspects, electrochemical impedance spectroscopy (EIS) was carried out on the electrocoated samples. The results showed that by increasing the curing temperature, the protective properties of electrocoated galvanized steel are improved compared to the electrocoated normal steel (the magnitude of pore resistance is about 2 orders more), but at low curing temperatures the protective properties of electrocoated normal steel are better than galvanized steel (the magnitude of pore resistance is about 2 orders more).

Corrosion; Cathodic electrocoating; Galvanized steel; EIS