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Korean Journal of Metals and Materials > Volume 59(2); > Article
doi: https://doi.org/10.3365/KJMM.2021.59.2.73
알루미늄 합금의 표면처리에 있어서 2단계 양극산화의 젖음성 영향
어재동1, 김진규2, 정용석3, 이종항4, 김욱배2
1㈜에스앤디이엔지
2한국산업기술대학교 기계설계공학과
3한국산업기술대학교 신소재공학과
4한국산업기술대학교 기계공학과
Effects of Two-Step Anodization on Surface Wettability in Surface Treatment of Aluminum Alloy
Jae Dong Eo1, Jingyu Kim2, Yongsug Jung3, Jong-Hang Lee4, Wook Bae Kim2
1S&D ENG Co., Ltd, Sihueng, 15118, Republic of Korea
2Department of Mechanical Design Engineering, Korea Polytechnic University, Sihueng 15073, Republic of Korea
3Department of Advanced Materials Engineering, Korea Polytechnic University, Sihueng 15073, Republic of Korea
4Department of Mechanical Engineering, Korea Polytechnic University, Sihueng 15073, Republic of Korea
Correspondence  Wook Bae Kim ,Tel: +82-31-8041-0430, Email: wkim@kpu.ac.kr
Received: 23 September 2020;  Accepted: 17 December 2020.  Published online: 27 January 2021.
ABSTRACT
Industrial anodizing of aluminum alloys is widely employed for various products, to improve corrosion and contamination protection as well as aesthetic appearance. At the same time, nanostructure fabrication using highly ordered porous aluminum oxides has been increasingly investigated in academic research for diverse micro-/nano applications. This approach is based on two-step anodization with limited process conditions, such as extended process time and low temperature. In this study, two-step anodizing was employed to anodize hairline-finished Al 1050 with sulfuric acid considering industrial processing conditions. The method is particularly suited for anodized products that require post-processing such as printing, dyeing and/or bonding. Porous anodized layers that were fabricated using conventional single anodizing, and twostep anodizing under identical processing conditions were compared. Variations in porosity, pore diameter, and inter-pore distance were examined in relation to the anodizing parameters, such as temperature and voltage. The results showed that two-step anodizing caused an increase in all measured pore-related measurements, and produced a much more uniform porous layer than the conventional anodizing process. Water contact angles were evaluated on the anodized surface of the previously machined hairline specimen. It was found that the water contact angles clearly decreased on the surfaces treated by two-step anodization, compared to the conventional anodizing process.
Keywords: anodizing, two-step anodization, porous material, wetting angle, aluminum alloy, superhydrophilicity
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