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http://dx.doi.org/10.4191/kcers.2013.50.2.108

Influence of the Duty Cycle on the Characteristics of Al2O3 Coatings Formed on the Al-1050 by Plasma Electrolytic Oxidation  

Nam, Kyung-Su (Departmemt of Materials Engineering, Graduate School of PaiChai University)
Moon, Jung-In (Departmemt of Materials Engineering, Graduate School of PaiChai University)
Kongsy, Phimmavong (Departmemt of Materials Engineering, Graduate School of PaiChai University)
Song, Jeong-Hwan (Departmemt of Information & Electronic Materials Engineering, PaiChai University)
Lim, Dae-Young (Departmemt of Information & Electronic Materials Engineering, PaiChai University)
Publication Information
Journal of the Korean Ceramic Society / v.50, no.2, 2013 , pp. 108-115 More about this Journal
Abstract
Oxide coatings were prepared on Al-1050 substrates by an environment-friendly plasma electrolytic oxidation (PEO) process using an electrolytic solution of $Na_2SiO_3$ (8 g/L) and NaOH (3 g/L). The effects of three different duty cycles (20%, 40%, and 60%) and frequencies (50 Hz, 200 Hz, and 800 Hz) on the structure and micro-hardness of the oxide coatings were investigated. XRD analysis revealed that the oxides were mainly composed of ${\alpha}-Al_2O_3$, ${\gamma}-Al_2O_3$, and mullite. The proportion of each crystalline phase depended on various electrical parameters, such as duty cycle and frequency. SEM images indicated that the oxide coatings formed at a 60% duty cycle exhibited relatively coarser surfaces with larger pore sizes and sintering particles. However, the oxides prepared at a 20% duty cycle showed relatively smooth surfaces. The PEO treatment also resulted in a strong adhesion between the oxide coating and the substrate. The oxide coatings were found to improve the micro-hardness with the increase of duty cycle. The structural and physical properties of the oxide coatings were affected by the duty cycles.
Keywords
PEO; Duty cycle; $Al_2O_3$ coating; Al-1050; Micro-hardness;
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Times Cited By KSCI : 2  (Citation Analysis)
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