The characterization of plasma electrolytic oxidation coatings on AZ41 magnesium alloy

作者：Apelfeld, A.; Krit, B.^*; Ludin, V.; Morozova, N.; Vladimirov, B.; Wu, R. Z.^*

来源：Surface and Coatings Technology, 2017, 322: 127-133.

DOI：10.1016/j.surfcoat.2017.05.048

• Plasma electrolytic oxidation
• Magnesium alloys
• Corrosion resistance
• Electrolyte

Plasma Electrolytic Oxidation (PEO) was carried out on AZ41 magnesium alloy. The interrelation between the silicate-alkaline electrolyte composition and the maximum duration of defect-free PEO modifying, thickness, through porosity, and electrochemical response of the formed coatings were studied. Effects of the two-stage PEO treatment and additives of KF, NaF, and ZrO2 nanoparticles in composition of silicate-alkaline electrolyte on the coatings characteristics were also investigated. Results show that the two-stage PEO treatment and the additions of 5 g/lKF and 2 g/l ZrO2 nanoparticles all have positive effect on decreasing of corrosion current density of PEO coated alloy. For the untreated AZ41 alloy, the corrosion current density was 8.00.10(-1) A/m(2). After PEO treatment, the minimum corrosion current density value of 1.0.10(-4) A/m(2) was obtained.

• 出版日期2017-8-15
• 单位哈尔滨工程大学