Incorporation of carbon nanotubes into micro-coatings film formed on aluminum alloy via plasma electrolytic oxidation |
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Authors: | Kang Min LeeYoung Gun Ko Dong Hyuk Shin |
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Affiliation: | a Department of Metallurgy and Materials Engineering, Hanyang University, Ansan 426-791, Republic of Koreab School of Materials Science and Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea |
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Abstract: | The influence of the incorporation of carbon nanotubes (CNTs) on the coating structure of aluminum alloy processed by plasma electrolytic oxidation (PEO) has been studied as a function of the current density. A series of PEO coatings was applied in a silicate-electrolyte containing CNTs at three current densities, such as 50, 100, and 150 mA/cm2. As the current density increased, the responding voltage also increased due to a gradual increment in the amount of CNTs incorporated uniformly into the coating film. In addition, a number of CNTs were observed mainly near micro-pores formed in the coating film by plasma explosive arcs, resulting in a fairly uniform coating structure with a low density of micro-pores. This phenomenon was discussed based on the electrophoretic activity of CNTs. |
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Keywords: | Plasma electrolytic oxidation Metals and alloys Carbon nanotube Coating Microstructure |
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