Abstract
The corrosion behavior of duplex surface treatedAZ31 magnesium alloy was studied. The surface of AZ31 magnesium alloy was modified using plasma electrolytic oxidation (PEO) with subsequent sealing of the pores present in the coating using water based preservative containing corrosion inhibitors. Electrochemical corrosion tests were performed by electrochemical impedance spectroscopy and potentiodynamic polarization in 0.1M NaCl solution to continue with the previous studies by Kajánek (2019) and Hadzima (2020), immersion test was realized in 3.5% NaCl solution in order to simulate electrochemical corrosion in coastal areas. Results from immersion tests showed a significant improvement in the corrosion resistance via the duplex treatment compared to the both, uncoated AZ31 alloy as well as material surface treatment using simple PEO process. This fact was supported also by the results from electrochemical test compared to the tests performed on uncoated AZ31 alloy and simple PEO coated AZ31 alloy in the previous studies.
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