Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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A Study on the Wear Resistance Characteristics of Anodic Oxide Films Formed on Aluminium alloy using a Plasma Electrolytic Oxidation

플라즈마 전해산화법에 의해 형성된 알루미늄 합금의 양극산화피막 내마모 특성에 관한 연구

  • Jung, Woo-Chul (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Jin, Yun-Ho (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Choi, Jin-Ju (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Yang, Jae-Kyo (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE))
  • 정우철 (고등기술연구원 신소재공정센터) ;
  • 진연호 (고등기술연구원 신소재공정센터) ;
  • 최진주 (고등기술연구원 신소재공정센터) ;
  • 양재교 (고등기술연구원 신소재공정센터)
  • Received : 2018.05.31
  • Accepted : 2018.11.20
  • Published : 2018.12.31
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Abstract

In this study, plasma electrolytic oxidation (PEO) method was used to from anodic oxide films on Al alloy and their resistance and morphological characteristics were investigated as a function of film formation voltage and treatment time. Cross-sectional morphology and composition of the PEO films were analyzed by SEM (Scanning Electron Microscopy) and EDS (Energy Dispersive Spectroscopy). The PEO films showed increased surface roughness and thickness with of film formation voltage and treatment time. The wear resistance was found to be the best for the PEO film formed for 5 min at 500V which is attributed to be denser structure relatively and lower surface roughness.

Keywords

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Fig. 1. Voltage-time graph for the processes of Plasma Electrolytic Oxidation.

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Fig. 2. Schematic diagram of PEO process equipment.

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Fig. 3. Equipment used for wear resistance test ; (a) controller, (b) wear resistance test machine.

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Fig. 4. SEM micrographs of oxide films formed on Al alloy ; (a) 400V-5min, (b) 400V-15min, (c) 400V-20min, (d) 450V-5min, (e) 450V-15min, (f) 450V-20min, (g) 500V-5min, (h) 500V-15min, (i) 500V-20min.

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Fig. 5. EDS mapping analysis for surface of oxide film.

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Fig. 6. EDS mapping analysis for cross-section of oxide film.

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Fig. 7. Relative specific wear rate by experimental condition.

Table 1. Chemical composition of Al alloy.

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Table 2. Average thickness of the oxide films formed on Al alloy.

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Table 3. Result of surface roughness test on specimens.

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