Communications - Scientific Letters of the University of Zilina 2021, 23(2):B76-B88 | DOI: 10.26552/com.C.2021.2.B76-B88

Corrosion Behaviour of Preserved PEO Coating on AZ31 Magnesium Alloy

Filip Pastorek ORCID...1, Milan ©trbák ORCID...1, Daniel Kajánek ORCID...1, Martina Jacková ORCID...1, Jana Pastorková ORCID...1, Zuzana Florková ORCID...1
1 University of Zilina, Zilina, Slovakia

A surface treatment process, composed of plasma electrolytic oxidation (PEO) and sealing by temporary oil preservation system containing corrosion inhibitors, was performed on AZ31 magnesium alloy in order to improve its corrosion resistance in environments containing chlorides. Both atmospheric and immersion conditions were evaluated by electrochemical tests in 0.1M NaCl solution together with salt spray test according to STN EN ISO 9227 standard. The obtained results confirmed significant improvement of corrosion resistance reached by the PEO sealing in aggressive environments compared to the pure PEO coating on AZ31 surface. Hence, such a duplex coating is a very perspective alternative for magnesium alloy applications in severe conditions or for temporary protection of magnesium products coated by the PEO during marine transport.

Keywords: Plasma electrolytic oxidation; magnesium alloy; inhibitor; surface treatment; corrosion; electrochemical techniques

Received: July 17, 2020; Accepted: November 3, 2020; Prepublished online: December 16, 2020; Published: April 1, 2021  Show citation

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Pastorek, F., ©trbák, M., Kajánek, D., Jacková, M., Pastorková, J., & Florková, Z. (2021). Corrosion Behaviour of Preserved PEO Coating on AZ31 Magnesium Alloy. Communications - Scientific Letters of the University of Zilina, 23(2), B76-88. doi: 10.26552/com.C.2021.2.B76-B88
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