Surface morphology and corrosion behavior of electrolytic coatings in different aqueous solutions

Abstract

ZrO₃/AI₂O₃, AI₂O₃/Y₂O₃, ZrO₂/Y₂O₃ coatings were applied on SS440C steel substrates via an electrolytic double layer coating process. The effect of these different ceramic aquecous solutions on the surface morphology and corrosion protection of the coatings were studied. It was seen that ZrO₂/Y₂O₃ coating layer is adherent and subsequently facilitates significant protection again corrosion as test by Tafel Extrapolation test in form of potentiodynamic polarization. The surface morphology and hardness properties were examined by scanning electron microscopy (SEM) and Vickers hardness tester respectively. ZrO₂/Y₂O₃ double layer coating shows the best properties in morphology and hardness as compared to other aqueous solutions.