Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Society of Surface Science and Engineering (한국표면공학회)
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Effect of Heat Treatment on Surface Wettability of Al-Si-Mg Alloy

열처리 조건에 따른 Al-Si-Mg계 합금의 표면 젖음성 영향

  • Jang, Hosung (Advanced Forming Process R&D Group, Korea Institute of Industrial Technology) ;
  • Choi, Yoojin (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Seungwon (School of Materials Science and Engineering, University of Ulsan) ;
  • Jeon, Jongbae (Advanced Surface Coatings & Processing R&D Group, Korea Institute of Industrial Technology) ;
  • Park, Sunghyuk (School of Materials Science and Engineering, Kyungpook National University) ;
  • Shin, Sunmi (Advanced Forming Process R&D Group, Korea Institute of Industrial Technology)
  • 장호성 (한국생산기술연구원 첨단정형공정그룹) ;
  • 최유진 (울산대학교 첨단소재공학부) ;
  • 이승원 (울산대학교 첨단소재공학부) ;
  • 전종배 (한국생산기술연구원 첨단표면공정그룹) ;
  • 박성혁 (경북대학교 신소재공학부) ;
  • 신선미 (한국생산기술연구원 첨단정형공정그룹)
  • Received : 2018.11.30
  • Accepted : 2018.12.14
  • Published : 2018.12.31
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Abstract

The present study investigated the effect of heat treatment process on the surface wettability of an Al-Si-Mg alloy. After solution-treated at $525^{\circ}C$ and aged at $160^{\circ}C$, the alloy showed high hardness due to the formation of precipitates. In addition, surface wettability was improved in such a way that the contact angle of distilled water droplet on the flat surface decreased to $37.6{\sim}42.1^{\circ}$ after the heat treatment. The surface energy predicted by Owens-Wendt equation also confirmed the increase of surface energy after the heat-treatment. However, when the surface roughness increased, the positive effect of the heat treatment on wettability diminished due to the geometrical factors of the rough surface.

Keywords

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Fig. 1. Contact angle of a drop of liquid on two types of surface with different wettability.

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Fig. 2. Heat treatments of the Al-6.5wt.%Si-0.32wt.%Mg-0.15wt.%Fe-0.14wt.%Ti alloy.

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Fig. 4. SEM microstructure and EDS analysis results of Al-0.65wt%Si-0.32wt%Mg alloys. (a) noAnn sample and (b) Aging sample

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Fig. 3. Optical microstructure of Al-0.65wt.%Si-0.32wt.%Mg alloys. (a) noAnn sample, (b) AnnAC sample, (c) AnnWQ sample and (c) Aging sample.

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Fig. 5. Vickers hardness of Al-0.65wt%Si-0.32wt%Mg alloys.

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Fig. 6. Surface roughness of Al-0.65wt%Si-0.32wt%Mg alloys. Surface roughness profile of (a) smooth surface polished with 0.04 mm-colloidal silica suspension and (b) rough surface grinded with #1200 sand paper. (c) Average surface roughness, Ra, of samples.

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Fig. 7. Contact angle results for water droplets on the surface of Al-0.65wt%Si-0.32wt%Mg alloys. (a) Contact angle images on the smooth surface of noAnn and Aging sample. Contact angle results of (b) smooth surface polished with 0.04 mm-colloidal silica suspension and (c) rough surface grinded with #1200 sand paper.

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Fig. 8. Estimated surface free energy of Al-0.65wt%Si-0.32wt%Mg alloys.

Table 1. Chemical composition of sample used in the present study (wt%).

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Table 2. Surface energy parameters of the liquids used in the experiment and the measured contact angles on smooth surface of samples.

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