Session Sheet - 12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Corrosion I

12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Corrosion I
Program Organizers: Alan Luo, Ohio State University; Mihriban Pekguleryuz, McGill University; Sean Agnew, University of Virginia; John Allison, University of Michigan; Karl Kainer; Eric Nyberg, Kaiser Aluminum Trentwood; Warren Poole, University of British Columbia; Kumar Sadayappan, CanmetMATERIALS; Bruce Williams, Canmetmaterials Natural Resources Canada; Stephen Yue, Mcgill University

Wednesday 9:50 AM
June 16, 2021
Room: Invited IV
Location: Virtual

Session Chair: Mikhail Zheludkevich, Helmholtz Zentrum Geesthacht

9:50 AM  Invited
Critical Issues in Magnesium Corrosion: Needs, Gaps and Opportunities: John Scully¹; ¹University of Virginia
    Broader utilization of magnesium and magnesium alloys in corrosive environments requires further advances in corrosion science and engineering. Strategies to mitigate corrosion include either intrinsic improvements in alloy design to affect corrosion kinetics or extrinsic protective measures such as pretreatments, coatings and electrochemical protection. This talk focuses on the intrinsic attributes of magnesium alloys and surface films which control kinetic corrosion factors.

10:20 AM  Invited
Galvanic Corrosion of AZX611 Magnesium Alloy / A6005C Aluminum Alloy Joint: Isao Nakatsugawa¹; Yasumasa Chino¹; ¹National Institute of Advanced Industrial Science and Technology
    Galvanic corrosion between AZX611 (Mg-5.9wt.%Al-0.6wt.%Zn-1.0wt.%Ca) magnesium alloy / A6005C (Al-0.4wt.%Mg-0.6wt.%Si-0.2wt.%Fe) aluminum alloy joint in differently concentrated NaCl solutions was evaluated. The galvanic current showed a maximum at the initial stage and then decreased with time. H2 gas evolution was observed on both surfaces, which was accelerated in higher NaCl concentration. The weight loss measurement revealed that galvanic corrosion damaged not only AZX611 but also A6005C due to the surface alkalization caused by the cathode reaction. The Scanning Vibrating Electrode Technique (SVET) detected numerous local anodes on the AZX611 surface, which gradually disappeared and were replaced with passive areas. It was concluded that the galvanic corrosion of the AZX611 / A6005C joint was controlled by the depassivation behavior of the AZX611 anode, in which the NaCl concentration was critical.