[논문]Effect of Current Density on Porous Film Formation in Two-Step Anodizing for Al Alloy

Lee, Seung-Jun; Kim, Seong-Jong

doi:10.5695/jkise.2016.49.2.125

[국내논문] Effect of Current Density on Porous Film Formation in Two-Step Anodizing for Al Alloy 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.49 no.2, 2016년, pp.125 - 129

Lee, Seung-Jun (Department of Power System Engineering, Kunsan National University) , Kim, Seong-Jong (Division of Marine Engineering, Mokpo National Maritime University)

Abstract ▼ AI-Helper

Anodizing is a technology to generate thicker and high-quality films than natural oxide films by treating metals via electrochemical methods. Electrochemical manufacturing method of nano structure is an efficient technology in terms of cost reduction, high productivity and complicated shapes, which receives the spotlight in diverse areas. Especially, artificial films generated by anodizing technology possess excellent mechanical characteristics including hardness and wear resistance. It is also easy to modify thickness and adjust shape of those artificial films so that they are mainly used in sensors, filters, optical films and electrolytic condensers. In this study, experiment was performed to observe the effect of current density on porous film formation in two-step anodizing for Al alloy. Anodizing process was performed with 10 vol.% sulfuric acid electrolyte while the temperature was maintained at $10^{\circ}C$ using a double beaker. and $10{\sim}30mA/cm^2$ was applied for 40 minutes using a galvanostatic method. As a result, both pore diameters and distances between pores tended to increase as the local temperature and electrolysis activity increased due to the increase in applied current density.

주제어

AI 본문요약
AI-Helper

* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.

가설 설정

1. Pore diameters and interpore distance tended to increase in proportion to the increase in the applied current density. It is determined that increased temperature by current concentration phenomenon during the reaction may have increased the activity of electrolyte.
3. Electrolysis voltage heightened with an increase of the current density, resulting in high solubility and forming larger pores in shorter time. This result estimated in which pore diameters are proportional to the magnitude of electrolysis voltage.

제안 방법

After surface modification, the pore structure and porosity were observed with a field emission scanning electron microscope (FE-SEM) and 3D analysis microscope. And composition and types of crystal material on the surface was analyzed by using X-ray diffraction (XRD). Additionally, the chemical compositions of the specimen are shown in Table 1.
In this study, the following is the result of comparing oxide film generation behavior according to the different current density using anodizing with various applied possibility and excellent physical characteristics.
In this study, to produce a uniform porous coating of the 5083 aluminum alloy, electro-polishing was performed for 3 minutes under the conditions of 25 V and 5℃ with a mixture solution of ethanol (95%) and perchloric acid (70%) at the volume ratio of 4 : 1. Then, first-step surface modification was performed with 10 vol.

대상 데이터

For the anode, a 5083 aluminum alloy with a 5 mm thickness and a size of 2 × 2 cm was used, and for the cathode, a platinum electrode was used, with a fixed distance of 3 cm between the two electrodes.

성능/효과

2. Oxide film in amorphous structure was generated via anodizing, however no significant differences in pore growth behavior were observed at different current density due to low voltage and short process times.

후속연구

Therefore, this study proposes to select the optimum alumunum anodizing condition to perform excellent corrosion resistance and durabillity in the harsh marine environment upon generating porous film with current density in sulfuric acid.

참고문헌 (18)

S. M. Moon, C. N. Yang, S. J. Na, Formation Behavior of Anodic Oxide Films on Al7075 Alloy in Sulfuric Acid Solution, J. Kor. Inst. Surf. Eng., 47 (2014) 155-161.

원문보기 상세보기
F. Keller, M. S. Hunter, D. L. Robinson, Structural Features of Oxide Coatings on Aluminum, J. Electrochem. Soc., 100 (1953) 411-419.

상세보기
H. Masuda, K. Fukuda, Ordered Metal Nanohole Arrays Made by a Two-step Replication of Honeycomb Structures of Anodic Alumina, Science, 268 (1995) 1466-1468.

상세보기
J. S. Jo, J. H. Kim, S. W. Ko, S. M. Lim, Heat Dissipation of $Al_2O_3$ Insulation Layer Prepared by Anodizing Process for Metal PCB, J. Korean Inst. Surf. Eng., 48 (2015) 33-37.

원문보기 상세보기
I. J. Son, Effect of Equal Channel Angular Pressing on the Pitting Corrosion Resistance of Hard Anodized Al5052 Alloy, J. Korean Inst. Surf. Eng., 48 (2015) 142-148.

원문보기 상세보기
S. Y. Kang, D. W. Lee, Study on Improvement of Corrosion Resistance and Wear Resistance by Anodizing and Sealing Treatment with Nanodiamond Powder on aluminum, J. Korean Inst. Surf. Eng., 47 (2014) 121-127.

원문보기 상세보기
G. E. Thompson, G. C. Wood, Corrosion: Aqueous Process and Passive Films, J. C. Scully, Academic Press, London, (1982) 205.
Y. H. Chang, C. W. Lee, Y. M. Hahm, Preparation of Porous Alumina Membrane by Anodic Oxidation in Sulfuric Acid, Korean J. Chem. Eng., 36 (1998) 653-660.
C. E. Michelson, The Current-Voltage Characteristics of Porous Anodic Oxides on Aluminum, J. Electrochem. Soc., 115 (1968) 213-219.

상세보기
T. A. Renshaw, A Study of Pore Structures on Anodized Aluminum, J. Electrochem. Soc., 108 (1961) 185-191.

상세보기
Y. C. Kim, Y. S. Jeong, Surface Treatment of Aluminium by Anodizing, Prospectives of Industrial Chemistry, 2 (1999) 3-10.
E. K. Joo, S. S. Kim, H. J. Oh, C. S. Chi, Effects of Hydration Treatments on the Phase Transition of Anodic Aluminum Oxide Layers, Korean J. Mater. Res., 12 (2002) 540-544.

원문보기 상세보기
S. K. Kim, Effects of Additives on The Formation of Etch-Pit of Pure Al and Analysis on Dielectric Films Formed by Anodizing, Ph.D. diss., Kookmin University, Seoul, (2000) 46.
J. S. Choi, J. W. Lee, J. H. Lim, S. J. Kim, Technology Trends in Fabrication of Nanostructures of Metal Oxides by Anodization and Their Applications, Ind. Eng. Chem., 19 (2008) 249-258.
V. F. Henley, Anodic oxidation of aluminum and its alloys, 1st eds., Pergamon Press, New-York (1982) 124.
S. Park, T. Kang, The Mechanism of The Formation of An Anodic Oxide Layer on The Aluminium, J. Kor. Inst. Surf. Eng., 12 (1979) 167-173.
D. N. Lee, J. H. Lee, I. K. Kang, The Structure of Porous Anodic Oxide Films on Aluminum, Korean J. Met. Mater., 11 (1973) 34-354.
T. P. Hoar, J. Yahalom, The Initiation of Pores in Anodic Oxide Films Formed on Aluminum in Acid Solutions, J. Electrochem. Soc., 110 (1963) 614-621.

상세보기

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 논문명, 저널/프로시딩명, 저자 , 발행년, 권, 호, 시작페이지, 끝페이지, 발행기관 관리번호, 논문명, 대등논문명, 저자 , 저널/프로시딩명, 발행기관, 발행년, 발행언어, 권, 호, 시작페이지, 끝페이지, ISBN, ISSN, 주제분야, 키워드, 초록(한글), 초록(영문), 저자(소속기관)
저장형식	Text(ASCII format) Excel format RefWorks Direct Export RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

연합인증