Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of form of applied current on the formation behavior of PEO films on Al6082 alloy

  • Moon, Sungmo (Surface Technology Division, Korea Institute of Materials Science) ;
  • Kim, Juseok (Surface Technology Division, Korea Institute of Materials Science) ;
  • Shin, Heon-Cheol (Department of Materials Science and Engineering, Pusan National University)
  • Received : 2022.02.18
  • Accepted : 2022.02.28
  • Published : 2022.02.28
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Abstract

This work is concerned with the formation behavior of PEO (Plasma Electrolytic Oxidation) films on Al6082 alloy under the application of direct current (DC) and alternating current (AC) in an alkaline solution. Arc initiation voltage became much lower by the application of AC than DC, and arc initiation time became shorter under DC than AC. The number of pores present in the PEO films was much larger than that on the surface, irrespective of DC and AC. It was also found that the number of pores in the PEO films formed under AC was more than that under DC and the size of pores is smaller under AC than DC. During the formation of PEO films, a lot of heat was generated and solution temperature increased more rapidly under DC than under AC which is attributed to high PEO film formation voltage under DC than AC.

Keywords

Acknowledgement

This study was supported financially by Fundamental Research Program of the Korean Institute of Materials Science (KIMS).

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