| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advanced Coatings for Wear and Corrosion Protection
|
| Presentation Title |
Galvanic Corrosion of AZ31B Ultrasonically-welded with Bare and Zn-coated Steels |
| Author(s) |
Jiheon Jun, Jian Chen, Yong Chae Lim, Michael Brady, Donovan Leonard, Zhili Feng |
| On-Site Speaker (Planned) |
Jiheon Jun |
| Abstract Scope |
Magnesium alloys, which are of great interest for light-weight structural components, are highly susceptible to galvanic corrosion when joined with other metals. This work investigated galvanic corrosion of ultrasonic spot welded (USW) AZ31B and dual-phase steels with and without Zn coating in a lap joint configuration. The USW specimens were exposed in 0.1 M NaCl with specific tape-masking schemes to produce measurable corrosion depths on AZ31B in the near weld region. The corrosion depths of AZ31B were smaller when joined with Zn-coated steels than bare steel, indicating galvanic corrosion decreased by Zn coating on the steel. Corrosion potential measured during NaCl solution immersion was more noble in AZ31B welded with Zn-removed (bare) steel, implying greater galvanic polarization for AZ31B. This agreed with the larger corrosion depth of AZ31B joined with bare steel. Bonding strength change of post-corrosion specimens assessed by lap shear tensile testing will also be presented. |