Abstract
The EV31A magnesium alloy has the potential for use in aerospace and automotive applications. To ensure the longevity of magnesium and its alloys in final applications, it is essential to know how quickly they corrode. An electrochemical approach (Tafel extrapolation and EIS) was used to evaluate the corrosion behaviour of EV31A alloy in various electrolytic mediums, including 0.6 M NaCl, 0.05 M H2SO4, 0.1 M HNO3, and 0.1 M HF. In each electrolytic solution, the stir-cast, T4, and T6 heat-treated samples corroded electrochemically. The as-cast EV31A alloy has superior corrosion resistance than T4 (solutionising) and T6 (solutionising cum age hardened). Because intermetallic precipitates have a large volume percentage in as-cast, it offers excellent corrosion resistance due to micro-galvanic or localised corrosion. In EV31A, chloride and fluoride ions have the same impact as compared with sulphate and nitrate ions. The as-cast EV31A shows a corrosion rate of 0.03 mm/year in solution containing 0.6 M NaCl and 0.1 M HF.
Graphical abstract
The EV31A is analysed in electrolytes such as 0.6 N NaCl, 0.1 N H2SO4, HNO3, and HF. The electrochemical techniques such as Tafel method and EIS used to analysis the rate of corrosion. Stir-cast EV31A Mg alloy shows better corrosion resistance in all test conditions.
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Acknowledgements
The authors would like to thank Dr. A. Raja Annamalai, Professor & Director, Centre for Innovation Manufacturing Research, Vellore Institute of Technology, Vellore for introducing to the field of corrosion, giving his valuable inputs, and for providing the research facility to perform electrochemical corrosion analysis.
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Somasundaram, M., NarendraKumar, U. Electrochemical corrosion behaviour of stir cast and heat-treated EV31A magnesium alloy in different electrolytic mediums. J Appl Electrochem 53, 585–595 (2023). https://doi.org/10.1007/s10800-022-01778-8
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DOI: https://doi.org/10.1007/s10800-022-01778-8