Stress Corrosion Cracking of Ti-8Al-1Mo-1V Alloy: Aqueous and Methanol Environments

Stress corrosion cracking of Ti-8-1-1 alloy was studied using controlled potential techniques in aqueous and methanol environments with and without halogen ions. The alloy was observed to display susceptible zones in aqueous solutions containing halogen ions—susceptible zones are in the corrosion potential and pitting potential regions. Also, potential zones of anodic and cathodic protection exist. In methanol environments, the alloy displays both potential regions of cathodic protection and anodic susceptibility—the anodic susceptible region is aggravated by the presence of halogen ions. The dependence of cracking susceptibility and immunity to cracking on potential suggests that anodic dissolution, catalytic action of halogen ions, and hydride formation may be important in aqueous solutions; whereas, in methanol solutions, anodic dissolution and halogen ion attack are of primary importance.