Evaluation of Corrosion Behavior of Al2O3/MgO/TiO2 Mixed Metal Oxides Coating Synthesized by Sol-Gel Method in Chloride solution
In this study، mixed metal oxides Al2O3/MgO/TiO2 coatings with Al/Mg/Ti ratio of 5:1: 3 and 2. 5:3: 4 were coated on aluminum by sol-gel method. The surface morphology، Phase analysis، thermal behavior and the corrosion behavior of the Al2O3/MgO/TiO2 coatings were characterized by (SEM)، (XRD)، (TG-DTA) and Potentiodynamic Polarization test in 3. 5 wt. % NaCl solution. The results demonstrated that heat treatment at 450 °C caused the decrease of corrosion resistance of coating so that after heat treatment، corrosion rate of the samples coated with Al/Mg/Ti molar ratio of 5:1: 3 and 2. 5:3: 4 were 5 and 13 times respectively.
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