Optimization of plasma electrolyte oxidation process parameters for corrosion resistance of Mg alloy

Z.Shahri; S.R.Allahkaram; R.Soltani; H.Jafari

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Optimization of plasma electrolyte oxidation process parameters for corrosion resistance of Mg alloy

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Plasma electrolyte oxidation(PEO)is a surface treatment method with high dependency on the process parameters.This paper focuses on maximizing the corrosion resistance of PEO coatings applied on Mg-5Zn-0.4Ca(ZX504)alloy by optimizing the process parameiers.For this purpose,the Taguchi method based on LI8 orthogonal array with mixed level design was used for optimization and determining effective parameters.Main process factors including electrolyte concentration,current density,frequency and duty cycle were considered at different levels.The corrosion resistance,as the performance indicator,was obtained using electrochemical impedance spectroscopy technique.Surface characteristics were also evaluated using SEM(scanning electron microscopy),EDS(energy dispersive spectroscopy),profilometer and contact angle goniometer.The statistical analysis showed that the optimum condition could be obtained at a current density of 200 mA/cm^2,frequency of 500Hz and at a duty cycle of 30%,in an electrolyle containing 15 g/L NazPO·12H2O and 10g/L KF.

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《镁合金学报（英文）》 |2020年第002期|431-440|共10页
作者
Z.Shahri; S.R.Allahkaram; R.Soltani; H.Jafari;
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School of Metallurgy and Materials Engineering College of Engineering University of Tehran P.O.Box: 11155-4563 Tehran Iran;

School of Metallurgy and Materials Engineering College of Engineering University of Tehran P.O.Box: 11155-4563 Tehran Iran;

School of Metallurgy and Materials Engineering College of Engineering University of Tehran P.O.Box: 11155-4563 Tehran Iran;

Materials Engineering Department Faculty of Mechanical Engineering Shahid Rajaee Teacher Training University Tehran Iran;

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Optimization of plasma electrolyte oxidation process parameters for corrosion resistance of Mg alloy

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