Electrochemical Characteristics of Titanium Alloy in Aviation Oil Mediumand Nacl Solution

摘要

The electrochemical characteristics of a new titanium alloy Ti-6Al-1.5Cr-2Zr in 3~# aviation kerosene and 928 lubricating oil with high resistance were studied by using potentiodynamic polarization. The electrochemical properties including the laws of polarization, open-circuit potential, linear polarization resistance and variation of corrosion current were investigated. The corrosion behaviors of titanium alloy were investigated by using immersion method in 3~# aviation kerosene and 928 lubricating oil. It was not found that visible corrosion appeared in the oil medium. The electrochemical characteristics of the alloy in 3.5%NaCl solution were also studied to compare that in the oil medium. It was found that the open-circuit potential was -0.18V, passivation potential was 0.23V, passivation current density was 0.31 x 10~(-4)A/cm~2 in 3.5%NaCl solution, the passivation area potential was in the range of 0.27V-1.24V in 3.5%NaCl solution.