The electrochemical polarization test is carried out for these three composites and the base metal in a solution containing 3.5 weight percent NaCl with 60 minutes of immersion time based on the ASTM G5 standard. In this standard, a three-electrode system is used in a 3.5 % NaCl electrolyte medium. A Calomel electrode is selected as reference, Platinum as the counter electrode, and the evaluated sample as the working electrode.