Susceptibility to Pitting Corrosion of Ti-CP2, Ti-6Al-2Sn-4Zr-2Mo, and Ti-6Al-4V Alloys for Aeronautical Applications

Titanium alloys are used in different industries like biomedical, aerospace, aeronautic, chemical, and naval. Those have high requirements with few damage tolerances. Therefore, they necessary to use materials that present fatigue, mechanical, corrosion resistance. Although Ti-alloys material performance, exposed marine industrial environments. This research shows the behavior of three titanium alloys, specifically Ti CP2, Ti-6Al-2Sn-4Zr-2Mo, Ti-6Al-4V. Alloys were on two electrolytes a 3.5 wt % H2SO4 NaCl solutions at room temperature using cyclic potentiodynamic polarization (CPP) electrochemical noise (EN) according ASTM G61 G199 standards. CPP technique was employed obtain parameters as passivation range (PR), type, passive layer persistence, potential (Ecorr), rate. EN analyzed by power spectral density (PSD) voltage. Results obtained revealed pseudopassivation PSD for indicating instability rate lower. However, Ti-6Al-4V presented highest both electrolytes. Ti-6Al-2Sn-4Zr-2Mo NaCl, unstable. lower solutions.