Studying the Influence of Zirconium-Based Conversion Coating on the Adhesion and Anticorrosion Properties of Epoxy Coating Applied on the Aluminium Alloy 1050

This study investigates the effects of zirconium-based (Zr) conversion coating on the adhesion properties and corrosion resistance of an epoxy/polyamide coating applied on the aluminium alloy 1050 (AA1050). The epoxy coating adhesion to the Zr treated substrate was evaluated by a pull-off test. The electrochemical impedance spectroscopy (EIS) was employed to characterize corrosion performance of the coated substrates. The Zr conversion layer formation on the aluminium surface resulted in the increase of adhesion strength of the epoxy coating. Also, the deposited conversion layer could enhance the corrosion protective performance of the epoxy coating significantly