PEO Film Formation Behavior of Al1050 Alloy Under Direct Current in an Alkaline Electrolyte
2
조회
0
다운로드
5
인용
0
참고문헌
키워드
초록
This work demonstrates arc generation and anodic film formation behaviors on Al1050 alloy during PEO (plasma electrolytic oxidation) treatment under a constant direct current in an alkaline electrolyte containing silicate, carbonate and borate ions. Only one big arc more than 2 mm diameter was generated first at the edges and it was moving on the fresh surface or staying occasionally at the edges, resulting in the local burning due to generation of an extremely big orange colored arc at the edges. Central region of the flat surface was not fully covered with PEO films even after sufficiently long treatment time because of the local burning problem. The anodic oxides formed on the flat surface by arcing once were found to consist of a number of small oxide nodules with spherical shape of 3~6 μm size and irregular shapes of about 5 ~10 μm width and 10~20 μm length. The anodic oxide nodules showed uniform thickness of about 3 μm and rounded edges. These experimental results suggest that one big arc observed on the specimen surface under the application of a constant direct current is composed of a number of small micro-arcs less than 20 μm size.
Abstract
This work demonstrates arc generation and anodic film formation behaviors on Al1050 alloy during PEO (plasma electrolytic oxidation) treatment under a constant direct current in an alkaline electrolyte containing silicate, carbonate and borate ions. Only one big arc more than 2 mm diameter was generated first at the edges and it was moving on the fresh surface or staying occasionally at the edges, resulting in the local burning due to generation of an extremely big orange colored arc at the edges. Central region of the flat surface was not fully covered with PEO films even after sufficiently long treatment time because of the local burning problem. The anodic oxides formed on the flat surface by arcing once were found to consist of a number of small oxide nodules with spherical shape of 3~6 μm size and irregular shapes of about 5 ~10 μm width and 10~20 μm length. The anodic oxide nodules showed uniform thickness of about 3 μm and rounded edges. These experimental results suggest that one big arc observed on the specimen surface under the application of a constant direct current is composed of a number of small micro-arcs less than 20 μm size.
참고문헌 (14)
- A. L. Yerokhin, "Plasma electrolysis for surface engineering", Surface and Coatings Technology, 122, pp.73~93 (1999)
- E. Matykina, "Plasma electrolytic oxidation of pre-anodized aluminium", Corrosion Science, 51, pp.2897~2905 (2009)
- S. Moon, "Generation mechanism of microdischarges during plasma electrolytic oxidation of Al in aqueous solutions", Corrosion Science, 51, pp.1506~1512 (2009)
- S. Moon, "Anodic oxidation of Mg-Sn alloys in alkaline solutions", Corrosion Science, 65, pp.494~501 (2012)
- 문성모, "AZ31 마그네슘 합금의 플라즈마전해산화 피막 형성에 미치는 수산화 이온 및 규산 이온의 영향", 한국표면공학회지, 47(4), pp.147~154 (2014), 한국표면공학회[DOI]
- 권두영, "인산 및 규산 이온이 포함된 수용액에서 AZ31 마그네슘 합금의 플라즈마전해산화 피막의 구조에 미치는 수산화나트륨 농도의 영향", 한국표면공학회지, 49(1), pp.46~53 (2016), 한국표면공학회[DOI]
- 문성모, "Anodic Oxide Films Formed on AZ31 Magnesium Alloy by Plasma Electrolytic Oxidation Method in Electrolytes Containing Various NaF Concentrations", 한국표면공학회지, 49(3), pp.225~230 (2016), 한국표면공학회[DOI]
- 문성모, "Anodic Oxidation Behavior of AZ31 Magnesium Alloy in Aqueous Electrolyte Containing Various Na2CO3 Concentrations", 한국표면공학회지, 49(4), pp.331~338 (2016), 한국표면공학회[DOI]
- X. Lu, "Plasma electrolytic oxidation coatings with particle additions – A review", Surface and Coatings Technology, 307, pp.1165~1182 (2016)
- 이정형, "해양환경용 알루미늄 합금의 플라즈마 전해 산화 시 표면 특성에 관한 불화칼륨(KF)의 영향", 한국표면공학회지, 49(3), pp.280~285 (2016), 한국표면공학회[DOI]
- 이정형, "Characterization of Ceramic Oxide Layer Produced on Commercial Al Alloy by Plasma Electrolytic Oxidation in Various KOH Concentrations", 한국표면공학회지, 49(2), pp.119~124 (2016), 한국표면공학회[DOI]
- S. Moon, "The formation and dissolution of anodic oxide films on pure aluminium in alkaline solution", Electrochimica Acta, 44, pp.2445~2454 (1999)
- S. Moon, "The mechanism of stress generation during the growth of anodic oxide films on pure aluminium in acidic solutions", Electrochimica Acta, 43, pp.3117~3126 (1998)
- 문성모, "Lateral Growth of PEO Films on Al1050 Alloy in an Alkaline Electrolyte", 한국표면공학회지, 50(1), pp.10~16 (2017), 한국표면공학회[DOI]