Improvement in Corrosion and Adhesion Resistance of a Al₂O₃-CeO₂ Nanocomposite Coating on the Aluminum Alloy AA6061 via Surface Pretreatment

Abstract:

In the present study, a surface pretreatment method consisting of KOH etching followed by oxide thickening in boiling water was used to improve the corrosion and adhesion resistance of the coating. The coating morphology on non-pretreated and pretreated Al substrates was characterized by means of scanning electron microscopy (SEM), atomic force microscopy (AFM) and water contact angle measurement. FT-IR spectra was obtained by Fourier transform infrared spectrometer. The corrosion resistance of the coating in 3.5 wt.% NaCl solution was evaluated with potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques. The adhesion resistance of the coating was tested using ISO-2409 standard. Results show that KOH etching followed by oxide thickening in boiling water can effectively improves the corrosion resistance and durability of the coating. Besides, this surface pretreatment method can also improve significantly the adhesion resistance of the coating.

• Periodical: Advanced Materials Research (Volumes 1120-1121)
• Pages: 677-688
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.677
• Online since: July 2015
• Authors: Yu Mei Han*, Masoud Farzaneh
• Keywords: Adhesion, Al₂O₃-CeO₂, Corrosion Resistance, KOH Etching, Nanocomposite

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