Influence of Plasma Electrolytic Oxidation on Corrosion Characteristics of Friction Stir Welded ZM21 Magnesium Alloy
- Authors: Hari Krishna K.1, Koteswara Rao S.R.1, Dondapati S.2, Rameshbabu N.3
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Affiliations:
- Department of Mechanical Engineering, SSN College of Engineering
- Department of Mechanical Engineering, VIT University
- Department of Metallurgical and Materials Engg, National Institute of Technology
- Issue: Vol 55, No 4 (2019)
- Pages: 735-742
- Section: New Substances, Materials and Coatings
- URL: https://journal-vniispk.ru/2070-2051/article/view/205382
- DOI: https://doi.org/10.1134/S2070205119040099
- ID: 205382
Cite item
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.
About the authors
KL. Hari Krishna
Department of Mechanical Engineering, SSN College of Engineering
Author for correspondence.
Email: harikrishnakl@ssn.edu.in
India, Kalavakkam, 603110
S. R. Koteswara Rao
Department of Mechanical Engineering, SSN College of Engineering
Email: harikrishnakl@ssn.edu.in
India, Kalavakkam, 603110
Sreekanth Dondapati
Department of Mechanical Engineering, VIT University
Email: harikrishnakl@ssn.edu.in
India, Chennai, Tamilnadu, 600127
N. Rameshbabu
Department of Metallurgical and Materials Engg, National Institute of Technology
Email: harikrishnakl@ssn.edu.in
India, Tiruchirappalli, 620015
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