SrTiO3 Perovskite-Based Coating on AZ31 Alloy and its Characterization

Herein, the nanoparticles of SrTiO 3 perovskite oxide were synthesized using simple hydrothermal process.The synthesized perovskite oxide material was characterized by XRD and FTIR techniques.The XRD analysis reveals that the formed SrTiO 3 perovskite oxide in cubic crystal phase with high phase purity.The FTIR result demonstrate the stretching and vibration bands of Ti-O and Sr-O along with O-H functional groups.The SrTiO 3 perovskite oxide powder was added to silicone resin and the paste was applied on AZ31 alloy sample, which was then used for electrochemical analysis.The corrosion characteristics of SrTiO 3 perovskite oxide coating over AZ31 alloy were investigated in 7 % NaCl electrolyte, wherein platinum foil used as counter electrode, saturated calomel electrode (SCE) as reference and SrTiO 3 perovskite oxide coated AZ31 alloy as working electrode.The results reveal that the open circuit potential of AZ31 alloy shifted from -1.57V (SCE) to -0.95 V (SCE).The corrosion rates of bare AZ31 alloy calculated and found as 7 x 10 -2 mA/cm 2 , while the same after coating was measured as 9 x 10 -6 mA/cm 2 .The electrochemical impedance results also reveal that corrosion protection induced by the coating.Hence, it is summarized that the SrTiO 3 perovskite oxide coating demonstrated improved corrosion resistance for AZ31 alloy.