12th International Conference on Magnesium Alloys and their Applications (Mg 2021): Corrosion III
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

Friday 10:50 AM
June 18, 2021
Room: Contributed II
Location: Virtual

Session Chair: Konstantinos Korgiopoulos, McGill University


Improvement in the Corrosion Resistance of AZ31 Magnesium Alloy via a Composite Ccoating of the Zn-Ce LDH/Oxide: Vahdat Zahedi Asl1; Jingmao Zhao1; Yahya Palizdar2; 1Beijing University of Chemical Technology; 2Materials and Engineering Research Center
    The pH values of the solution, ratios of the cations, ‎intercalated compounds, and hydrothermal ‎‎conditions are the main parameters that influenced the LDH efficiency. In this paper, the ‎‎composite of the Oxide/LDH coatings, containing Zn2+ and Ce3+/Ce4+ as metal cations, were ‎prepared on the ‎AZ31 substrate by a combined co-precipitation and hydrothermal processing ‎method for the first ‎time. To investigate the effect of ‎Ce ions on the deposition of the suitable ‎coating on AZ31, the ‎LDHs with different ratios of the ‎cations were synthesized. The ‎comprehensive characterizations ‎of the morphology, ‎composition, structure, of the synthesized ‎coatings, were investigated by ‎SEM, XRD. PDP and EIS measurements were conducted to ‎compare the corrosion ‎behaviors of the ‎coatings. The self-healing ability of the scratched samples ‎was investigated. The ‎finding of this study proves that a composite coating composed of the ‎uniform scaffold-like clusters of the oxides incorporated with the LDH plates is ‎successfully ‎produced which can retard the corrosion of the AZ31 effectively‎

Efficient Corrosion Potential Measurement Technique for Mg Alloy: Coupling of Scanning Micro Droplet Capillary Method and Alloy Diffusion Couple: Min-Kyung Kim1; Samantha Gateman2; Janine Mauzeroll2; In-Ho Jung1; 1Seoul National University; 2McGill Univerisity
    Corrosion behavior of Mg alloy is one of key factors to determine the applicability of Mg alloys to automotive and other electronic components. However, the corrosion measurement for Mg alloys is time-consuming and highly dependent on the sample preparations and other experimental environmental factors. In order to build up the corrosion map data for various Mg alloys depending on the alloy composition and microstructure, more efficient novel corrosion measurement technique is required. In this study, we would like to present new efficient corrosion measurement technique coupling scanning electrochemical microscopy (SECM) and diffusion couple of Mg alloys. Using 250-nm diameter micropipette tip in contact with the surface of Mg sample, SECM can allow to measure the variation of corrosion potential of Mg alloy across the diffusion couple in a single scan. As an example of new novel method, the corrosion potential data of the Mg/Al diffusion couple will be demonstrated.

Corrosion Protection of AZ80 and ZK60 Forged Magnesium Alloys with Micro-arc Oxidation and Composite Coating: Yuna Xue1; Xin Pang2; Sheji Luo1; Xiaoyong Zhang1; Jahed Hamid3; 1Xi'an Shiyou University; 2CanmetMATERIALS, Natural Resources Canada,; 3University of Waterloo
    Wrought Mg alloys have attracted increasing attention for automotive applications due to their homogeneous microstructure and enhanced mechanical properties compared to as-cast alloys. However, in real service conditions Mg structural components are susceptible to early failures due to the synergistic effects of corrosion and mechanical loading, which severely hinder their high penetration in automotive industry. Therefore, the corrosion protection of Mg structural components is of crucial importance. In this work, AZ80 and ZK60 Mg alloys were forged under different temperatures, and then treated with micro-arc oxidation (MAO) and micro-arc composite coating (MCC) which is the MAO plus E-powder coating. The effects of forging processing parameters on the microstructure and corrosion properties of the alloys were analysed, and the corrosion performances of the MAO, MCC coated Mg alloys were characterized through salt spray corrosion test. Experimental results demonstrated that the MCC coating provided robust corrosion protection for the wrought Mg alloys.