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Improving the corrosion properties of magnesium AZ31 alloy GTA weld metal using microarc oxidation process

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Abstract

In this work, the morphology, phase composition, and corrosion properties of microarc oxidized (MAO) gas tungsten arc (GTA) weldments of AZ31 alloy were investigated. Autogenous gas tungsten arc welds were made as full penetration bead-on-plate welding under the alternating-current mode. A uniform oxide layer was developed on the surface of the specimens with MAO treatment in silicate-based alkaline electrolytes for different oxidation times. The corrosion behavior of the samples was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy. The oxide film improved the corrosion resistance substantially compared to the uncoated specimens. The sample coated for 10 min exhibited better corrosion properties. The corrosion resistance of the coatings was concluded to strongly depend on the morphology, whereas the phase composition and thickness were concluded to only slightly affect the corrosion resistance.

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Acknowledgments

The authors would like to acknowledge the Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirapalli for providing the funds and facilities to conduct this research work.

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Authors and Affiliations

  1. Department of Advanced Materials Engineering, Dong-Eui University, 995 Eomgwangno, Busanjin-gu, Busan, 614-714, South Korea

    M. Siva Prasad

  2. Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirapalli, 620015, India

    M. Siva Prasad, K. Sivaprasad & V. Muthupandi

  3. FARCAMT, Advanced Manufacturing Institute, King Saud University, Riyadh, Saudi Arabia

    M. Ashfaq

  4. Laboratory for Advanced Materials Processing, Empa, Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, CH-3602, Thun, Switzerland

    N. Kishore Babu

  5. Department of Chemistry, National Institute of Technology, Tiruchirappalli, 620015, India

    A. Sreekanth

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  1. M. Siva Prasad
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  2. M. Ashfaq
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  3. N. Kishore Babu
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  4. A. Sreekanth
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  5. K. Sivaprasad
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Correspondence to M. Siva Prasad.

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Siva Prasad, M., Ashfaq, M., Kishore Babu, N. et al. Improving the corrosion properties of magnesium AZ31 alloy GTA weld metal using microarc oxidation process. Int J Miner Metall Mater 24, 566–573 (2017). https://doi.org/10.1007/s12613-017-1438-x

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  • DOI: https://doi.org/10.1007/s12613-017-1438-x

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