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Open AccessArticle

Effects of Processing Parameters on the Corrosion Performance of Plasma Electrolytic Oxidation Grown Oxide on Commercially Pure Aluminum

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Department of Materials science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
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Department of Materials Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan
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Chemistry Division, Center for General Education, Chang Gung University, Taoyuan 33302, Taiwan
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Department of Nuclear Medicine and Molecular Imaging Center, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan
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Center for Plasma and Thin Film Technologies, Ming Chi University of Technology, New Taipei 24301, Taiwan
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Department of Mechanical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
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Plastic and Reconstructive Surgery, and Craniofacial Research Center, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan
*
Author to whom correspondence should be addressed.
Metals 2020, 10(3), 394; https://doi.org/10.3390/met10030394
Received: 23 February 2020 / Revised: 10 March 2020 / Accepted: 17 March 2020 / Published: 19 March 2020
(This article belongs to the Special Issue Plasma Treatment on Alloys' Surface)
The plasma electrolyte oxidation (PEO) process has been considered an environmentally friendly surface engineering method for improving the corrosion resistance of light weight metals. In this work, the corrosion resistance of commercially pure Al and PEO treated Al substrates were studied. The PEO layers were grown on commercially pure aluminum substrates using two different alkaline electrolytes with different addition concentrations of Si3N4 nanoparticles (0, 0.5 and 1.5 gL−1) and different duty cycles (25%, 50%, and 80%) at a fixed frequency. The corrosion properties of PEO coatings were investigated by the potentiodynamic polarization and electrochemical impedance spectroscopy test in 3.5 wt.% NaCl solutions. It showed that the weight gains, layer thickness and surface roughness of the PEO grown oxide layer increased with increasing concentrations of Si3N4 nanoparticles. The layer thickness, surface roughness, pore size, and porosity of the PEO oxide layer decreased with decreasing duty cycle. The layer thickness and weight gain of PEO coating followed a linear relationship. The PEO layer grown using the Na2B4O7∙10H2O contained electrolyte showed an excellent corrosion resistance and low surface roughness than other PEO coatings with Si3N4 nanoparticle additives. It is noticed that the corrosion performance of PEO coatings were not improved by the addition of Si3N4 nanoparticle in the electrolytic solutions, possibly due to its detrimental effect to the formation of a dense microstructure. View Full-Text
Keywords: plasma electrolytic oxidation; pure aluminum; Si3N4 nanoparticle; borax; corrosion resistance plasma electrolytic oxidation; pure aluminum; Si3N4 nanoparticle; borax; corrosion resistance
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Mengesha, G.A.; Chu, J.P.; Lou, B.-S.; Lee, J.-W. Effects of Processing Parameters on the Corrosion Performance of Plasma Electrolytic Oxidation Grown Oxide on Commercially Pure Aluminum. Metals 2020, 10, 394.

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