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Influence of Plasma Electrolytic Oxidation on Corrosion Characteristics of Friction Stir Welded ZM21 Magnesium Alloy

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Abstract

Magnesium alloys and their welds are prone to severe corrosion and require corrosion prevention treatment before being used for engineering applications. In this study ZM21 magnesium alloy plates were friction stir welded and subjected to surface conversion treatment using Plasma Electrolytic Oxidation (PEO). Base material and welds with and without PEO coatings were characterized by optical microscopy and scanning electron microscopy (SEM). Electrochemical corrosion behavior of PEO coated and uncoated specimens were evaluated by potentiodynamic polarization tests (PDP) and electrochemical impedance spectroscopy (EIS). It has been concluded that PEO treatment results in significant improvement of corrosion resistance of both base material and friction stir welds of ZM21 magnesium alloy.

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ACKNOWLEDGMENTS

The authors are grateful to Dr. G. Madhusudhan Reddy, Scientist “H”, Defense Metallurgical & Research Labs, Hyderabad, for making the friction stir welds at Material Joining Laboratory.

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Authors and Affiliations

  1. Department of Mechanical Engineering, SSN College of Engineering, 603110, Kalavakkam, India

    KL. Hari Krishna & S. R. Koteswara Rao

  2. Department of Mechanical Engineering, VIT University, 600127, Chennai, Tamilnadu, India

    Sreekanth Dondapati

  3. Department of Metallurgical and Materials Engg, National Institute of Technology, 620015, Tiruchirappalli, India

    N. Rameshbabu

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  1. KL. Hari Krishna
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  2. S. R. Koteswara Rao
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Correspondence to KL. Hari Krishna.

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Hari Krishna, K., Koteswara Rao, S.R., Dondapati, S. et al. Influence of Plasma Electrolytic Oxidation on Corrosion Characteristics of Friction Stir Welded ZM21 Magnesium Alloy. Prot Met Phys Chem Surf 55, 735–742 (2019). https://doi.org/10.1134/S2070205119040099

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  • DOI: https://doi.org/10.1134/S2070205119040099

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