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Effect of Microstructural Constituents on Fusion Zone Corrosion Properties of GMA Welded AA 5083 with Novel Al–Mg Welding Wires of High Mg Contents

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Abstract

The corrosion behavior of fusion zones (FZ-1: 5.39 Mg–0.66Mn, FZ-2: 5.49 Mg–0.35Mn, and FZ-3: 5.72 Mg–0.32Mn) of AA5083 alloy welded with high Mg-containing Al–Mg filler wires has been systematically investigated. An extensive microstructural characterization was performed to evaluate the localized corrosion properties of the fusion zones. The potentiodynamic polarization test and salt spray test showed that the corrosion resistance decreases with increasing Mg content, therefore, the corrosion resistance of FZ-3 is lower than that of the FZ-1 and FZ-2. The electron microscopic analysis after intermittent corrosion test revealed that the eutectic β-phase (Al3Mg2) was responsible for the initiation of corrosion. The corrosion behavior of each microstructural constituents was related to the dissolution potentials of the corresponding microstructures; hence, it forms galvanic couple with the Al matrix. Moreover, high Mg content in the filler wire lead to the formation of additional β-phase in the fusion zone. However, intermetallics such as Al6(Fe,Mn) and Mg2Si were significant only during the later stages of corrosion.

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Acknowledgements

This work was supported by the Korea Basic Science Institute (KBSI) National Research Facilities and Equipment Center (NFEC) grant funded by the Korea government (Ministry of Education) (No. 2019R1A6C1010045).

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Authors and Affiliations

  1. Department of Advanced Materials Engineering, Dong-Eui University, Busan, 47340, Republic of Korea

    Dileep Chandran Ramachandran, Siva Prasad Murugan, Chanyoung Jeong & Yeong Do Park

  2. Joining R&D Group, Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea

    Young-Min Kim, Dongcheol Kim & Gwang-Gook Kim

  3. Dongnam Regional Division, Korea Institute of Industrial Technology, Busan, 46742, Republic of Korea

    Dae-Geun Nam

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  1. Dileep Chandran Ramachandran
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  2. Siva Prasad Murugan
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Appendix

Appendix

The strength of the fusion zone is associated to the amount of Mg present in it. The Mg provides solid solution strengthening thereby increases the strength. The Table 4 elucidates the strengthening effect of Mg in the fusion zone.

Table 4 The Mg content and tensile strength of fusion zones
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Ramachandran, D.C., Murugan, S.P., Kim, YM. et al. Effect of Microstructural Constituents on Fusion Zone Corrosion Properties of GMA Welded AA 5083 with Novel Al–Mg Welding Wires of High Mg Contents. Met. Mater. Int. 26, 1341–1353 (2020). https://doi.org/10.1007/s12540-019-00434-9

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