| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Coatings and Surface Engineering for Environmental Protection III
|
| Presentation Title |
Galvanic Corrosion Mitigation by Material and Coating Selection for AZ31B bolt-joined with CFRP |
| Author(s) |
Yong Chae Lim, Jiheon Jun, Charles David Warren, Zhili Feng |
| On-Site Speaker (Planned) |
Yong Chae Lim |
| Abstract Scope |
Joining of Mg alloys and carbon fiber reinforced polymer (CFRP) is important to enable future lightweight automotive structures. Conventional bolting is a good joining technique to integrate Mg and CFRP into structural applications, but galvanic corrosion between Mg and steel bolt is a concern for the joint reliability. To mitigate galvanic corrosion, this work investigates (1) polytetrafluoroethylene (PTFE) coating on the steel bolts to serve as an insulating/barrier layer and (2) Al alloy bolts as a less cathodic material. All bolted Mg and CFRP joints were tested by NaCl solution immersion and ASTM B117 salt spray exposure, and the galvanic corrosion damage/susceptibility on Mg were assessed by optical profilometry and corrosion potential measurement. The corrosion test results indicate that PTFE coated steel bolt is highly effective to reduce galvanic corrosion. The effect of Al alloy bolts is currently under investigation. |
| Proceedings Inclusion? |
Planned: |