Oxime-Modified Aluminum(III) Isopropoxide: A Promising Sol–Gel Precursor for Corrosion Resistive Nano-Alumina Coating on an Aluminum Alloy

Abstract

Dense alumina coatings were fabricated over aluminum alloy via dip coating method using oxime-modified aluminum(III) isopropoxide as a sol–gel precursor. The influence of important dip coating parameter; withdrawal rates on quality, thickness, uniformity and corrosion resistivity of coatings were investigated. Structural characterization of coated substrates were done by X-ray diffraction patterns (XRD), scanning electron microscopy (SEM) and atomic force microscopy studies (AFM). Corrosion tests by electrochemical studies indicated that corrosion resistive alumina coatings can be achieved by using withdrawal rate of 25 mm min^–1 and 04 cycles of coatings in 3.5% aqueous NaCl solution.