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초록· 키워드
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In this study, double-layered anodizing films were formed on Al 5052 and Al 6061 alloys consecutively first in sulfuric acid and then in oxalic acid, and hardness, withstand voltage, surface roughness and acid resistance of the anodizing films were compared with single-layered anodizing films in sulfuric acid and oxalic acid electrolytes. Hardness of the double-layered anodizing film decreased with increasing ratio of inner layer to outer layer for both Al 5052 and Al 6061 alloys, suggesting that outer anodizing film formed in sulfuric acid electrolyte is damaged during the second anodizing in oxalic acid electrolyte. Withstand voltage of the double-layered anodizing films increased with increasing the thickness ratio of inner layer to outer layer.
Surface roughness of the double-layered anodizing films were comparable with that of single-layered anodizing film formed in sulfuric acid but higher than that of single layer anodizing film formed in oxalic acid electrolyte. In acid resistance test, all of the double-layered and single-layered anodizing films showed good acid resistance more than 3 h without any visible gas evolution, which is attributable to sealing of pores. Based on the experimental results obtained in this work, it is possible to design a double-layered anodizing film with cost-effectiveness and improved physical and electrical properties by combining two consecutive anodizing processes of sulfuric acid anodizing and oxalic acid anodizing methods.
Surface roughness of the double-layered anodizing films were comparable with that of single-layered anodizing film formed in sulfuric acid but higher than that of single layer anodizing film formed in oxalic acid electrolyte. In acid resistance test, all of the double-layered and single-layered anodizing films showed good acid resistance more than 3 h without any visible gas evolution, which is attributable to sealing of pores. Based on the experimental results obtained in this work, it is possible to design a double-layered anodizing film with cost-effectiveness and improved physical and electrical properties by combining two consecutive anodizing processes of sulfuric acid anodizing and oxalic acid anodizing methods.
목차
Abstract
1. 서론
2. 실험방법
3. 결과 및 고찰
4. 결론
References
참고문헌 (14)
참고문헌 신청
정용수, 박영희, 장관섭, 문성모, 최진섭, 정윤미, 실용표면처리기술시리즈 제5권 양극산화, 화신문화㈜, (2014).
Nagyeom Jeong, Jihyun Park, A Study on the Properties of Anodic Oxide Films Formed on Al Alloys in Oxalic Acid, The Korean Institute of Surface EngineeringJournal of The Korean Institute of Surface Engineering 53(5) 2020.10, 249-256.
M. Ardelean, S. Lascau, E. Ardelean, A. Josan, Surface treatments for aluminium alloys, IOP Conf. Series: Mater. Sci. Eng. 294 (2018) 012042.
S. Wernick, R. Pinner, P. G. Sheasby, The surface Treatment and Finishing of Aluminium and its Alloys, 5th Ed., Finishing Pubilications Ltd., (1987).
Y. Tak, J. Kang, J. Choi, Electrochemical Properties of Metal Aluminium and Its Application, J. Korean Ind. Eng. Chem. 17 (2006) 335-342.
Nagyeom Jeong, Jihyun Park, A Study on the Properties of Anodic Oxide Films Formed on Al Alloys in Oxalic Acid, The Korean Institute of Surface EngineeringJournal of The Korean Institute of Surface Engineering 53(5) 2020.10, 249-256.
M. Ardelean, S. Lascau, E. Ardelean, A. Josan, Surface treatments for aluminium alloys, IOP Conf. Series: Mater. Sci. Eng. 294 (2018) 012042.
S. Wernick, R. Pinner, P. G. Sheasby, The surface Treatment and Finishing of Aluminium and its Alloys, 5th Ed., Finishing Pubilications Ltd., (1987).
Y. Tak, J. Kang, J. Choi, Electrochemical Properties of Metal Aluminium and Its Application, J. Korean Ind. Eng. Chem. 17 (2006) 335-342.
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