The Electrochemical and Microstructure Effects of TiB2 and SiC Addition to AA5052/Al2O3 Surface Composite Coatings in 0.5 M H2SO4 Solution

In this work, Al2O3, SiC, and TiB2 ceramic coatings with different formulations were produced on the surface of AA5052 matrix by gas tungsten arc welding (GTAW). The corrosion behavior composites base metal (BM) was evaluated in a solution 0.5 M H2SO4 electrochemical techniques such as open circuit potential (OCP) monitoring, potentiodynamic polarization (PDP), impedance spectroscopy (EIS). morphology cladded surfaces monitored scanning electron microscopy (SEM) energy-dispersive X-ray (EDS). Based PDP EIS results, BM had lowest rate solution. All composite shifted to higher values than that BM, indicating lower resistance compared BM. SEM images corroded exhibit minimum pitting sulfuric acid media. According studies, AA5052/Al2O3 + SiC due formation micro-galvanic sites aluminum surface. However, showed best performance other composites. general, adding ceramics Al2O3 fabricating binary composites, is improved. Although their hardness makes use justified applications where high mechanical properties are required if environment not too aggressive.Graphical Abstract