A two-stage process was used to produce nano-composite epoxy coatings.The first step involved preparing nano-AI concentrates with high concentration and low viscosity,and the second step produced nanocomposite epoxy coatings by mixing the nano-AI concentrates and epoxy resin.Later,the coating was examined with immersion and salt spray tests.The coatings were characterized by electrochemical impedance spectroscopy(EIS),scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS).The results showed that the 5%nano-AI significantly improves the corrosion resistance of the coatings.There are two effects of nano-AI on the coating.Nano-AI is corroded initially to protect the substrate from corrosion, and then the aluminum oxide and aluminum hydroxide were produced after corrosion of nano-AI,which hindered the transmission of corrosion fluid into the coatings.
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