Abstract
Two nanofiber coatings, namely polyvinyl alcohol (PVA) and polyvinyl chloride (PVC) were prepared and deposited on aluminum surface using electrospinning technology. The coating layers were characterized using thermogravimetric analysis (TGA), optical (OM) and scanning electron (SEM) microscopes. The SEM images showed that the deposited PVA and PVC coatings on the aluminum surface have a compact and entangled nanofiber structure with diameters varied from 100 to 199 nm in case of PVA/Al, and from 150 to 400 nm in case of PVC/Al. The electrochemical corrosion of aluminum without and with PVA and PVC coatings in freely aerated stagnant solutions of 3.5 wt.% sodium chloride (NaCl) was investigated using cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) measurements. It has been found that the deposited PVA and PVC coatings decrease the corrosion currents and corrosion rate as well as increase the corrosion resistance for aluminum in the NaCl solution. Results together were in good agreement and confirmed that the deposited PVA and PVC coatings highly protect the aluminum versus corrosion in the chloride test solutions.