Corrosion Resistance of Enamel Vitreous Coating Obtained by Electrophoretic Deposition

Abstract

In this study, a non-commercial ceramic compound with high corrosion resistance based on Na2O, Al2O3, SiO2, K2O, CaO, TiO2, FeO and others, was developed and stabilized in an aqueous media. The enamel coatings were developed over stainless steel 316L at 7.5 V and 30, 60 and 90 secounds by electrophoretic deposition technique (EPE coatings). EPE coatings were characterized by scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) techniques showing a compact and homogeneous enamel surface and a typical composition of the glass frit deposited. Surface micro hardness measurements of EPE coatings were 7.6 times harder than the steel base material using an automatic hardness tester equipped. As well as, surface roughness measurements of EPE coatings were 19 times and 15 times less rugged than the steel base material at about Raand Rz, respectively using a confocal microscope. EPE coatings at 60 s and 90 s show a better behavior for reducing the corrosion process, evaluated using potentiodynamic polarization method in 3.5 wt. % NaCl solution.