|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Effect of Mechanical Deformation on the Corrosion Behavior in Al 7075 – Ti6Al4V Galvanic Joint
||Chaitanya Kale, Ilaksh Adlakha, Soundarya Srinivasan, Kiran Solanki
|On-Site Speaker (Planned)
Structural alloys are often subjected to mechanical stresses in aggressive corrosive environments, e.g., salt water and moist air. Therefore, we investigated the effect of mechanical deformation on the corrosion behavior of a galvanic couple typically used in structural joints in naval structures, namely, Al7075 and Ti6Al4V. Specimens were pre-strained to various plastic strain levels, and the corrosion behavior of the galvanic joints was examined through separate immersion and spray environments with 3.5wt% NaCl solution for 14 days. The corroded surfaces were characterized using scanning electron microscopy, optical imaging and surface profilometry techniques. For both the immersed and sprayed conditions, the presence of plastic deformation on the Al7075 surface resulted in increased localized corrosion. However, the presence of mechanical deformation was not solely responsible for accelerating the corrosion behavior; rather, the presence of electrochemically heterogeneous micro-structural features combined with the localized deformation was critical in stress assisted corrosion.
||Planned: Supplemental Proceedings volume