Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Study of PEO Process for Al 7075 and Effect of additives

알루미늄 7075 합금의 PEO 처리 기술 및 첨가제 영향 분석

  • Jin, Yun-Ho (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Yang, Jae-Kyo (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE))
  • 진연호 (고등기술연구원 신소재공정센터) ;
  • 양재교 (고등기술연구원 신소재공정센터)
  • Received : 2020.02.21
  • Accepted : 2020.04.07
  • Published : 2020.04.30
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Abstract

In this study, we developed plasma electrolytic oxidation (PEO) process for aluminum 7075 alloy to improve the corrosion and mechanical properties. The electrolyte consists of potassium hydroxide and sodium silicate. Additionally, sodium stannate was added into the electrolyte to investigate its effect on PEO film formation. Titanium was used as the counter electrode. Plasma generation voltage reduced from 300V to 150 V by adding 4 g/L of sodium stannate. The thin oxide films were observed by SEM(Scanning Electron Microscopy)/EDS (Energy Dispersive Spectroscopy) for quantitative and qualitative analyses. XRD (X-ray diffraction) and XRF (X-ray Fluorescences) analyses were also carried out to identify oxide layer on aluminum 7075 surface. Vicker's hardness test was performed on the PEO-treated aluminum 7075 surface.

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References

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