Lateral Growth of PEO Films on Al1050 Alloy in an Alkaline Electrolyte
3
조회
0
다운로드
6
인용
0
참고문헌
키워드
초록
This article reports for the first time on the lateral growth of PEO (plasma electrolytic oxidation) films on Al1050 alloy by the application of anodic pulse current in an alkaline electrolyte. Generation of microarcs was observed at the edges initially and then moved towards the central region with PEO treatment time. Disc type PEO film islands with about 20 μm diameter were formed first and they grew laterally by the formation of new disc type PEO films at the edge of pre-formed PEO islands. The PEO film islands were found to be interconnected completely and form a continuous PEO film when generation of small size microarcs are terminated at the central part of the specimen, resulting in very smooth surface with low surface roughness less than 1 μm of Ra. Further PEO treatment after the complete interconnection of PEO films islands showed local thickening of PEO films by vertical growth. It is concluded that very smooth PEO film surface can be obtained by lateral growth mechanism rather than vertical growth of them.
Abstract
This article reports for the first time on the lateral growth of PEO (plasma electrolytic oxidation) films on Al1050 alloy by the application of anodic pulse current in an alkaline electrolyte. Generation of microarcs was observed at the edges initially and then moved towards the central region with PEO treatment time. Disc type PEO film islands with about 20 μm diameter were formed first and they grew laterally by the formation of new disc type PEO films at the edge of pre-formed PEO islands. The PEO film islands were found to be interconnected completely and form a continuous PEO film when generation of small size microarcs are terminated at the central part of the specimen, resulting in very smooth surface with low surface roughness less than 1 μm of Ra. Further PEO treatment after the complete interconnection of PEO films islands showed local thickening of PEO films by vertical growth. It is concluded that very smooth PEO film surface can be obtained by lateral growth mechanism rather than vertical growth of them.
참고문헌 (13)
- 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)