About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
Presentation Title |
Understanding the Effect of Polarization on SCC Resistance and Crack Tip pH of AA6111-T8 |
Author(s) |
Katrina E. Catledge, Mark Nichols, Gerald S. Frankel , Jenifer S. Locke |
On-Site Speaker (Planned) |
Katrina E. Catledge |
Abstract Scope |
6xxx Al-Mg-Si alloys are age-hardenable and considered resistant to stress corrosion cracking (SCC) in comparison to other age-hardened aluminum alloys. Their high strength-to-weight ratio makes them attractive for automotive applications in conjunction with steels and carbon fiber reinforced polymer (CFRP). This research investigates the effects of anodic polarization on the SCC resistance of AA6111-T8 in terms of threshold stress intensity and crack growth rates. Results show that anodic polarization to simulate galvanic coupling with CFRP severely reduces the SCC resistance. Testing under cathodic polarization is underway to verify that H produced during bulk sample cathodic polarization does not cause hydrogen embrittlement. Measured changes in crack tip pH during full immersion fracture mechanics-based cracking experiments will be compared to facilitate understanding of the effect of applied potential on SCC resistance. This work is supported by the Department of Energy under award number DE-EE0007760 through a sub-award under PPG Industries, Inc. |
Proceedings Inclusion? |
Planned: |