피막처리 시간에 따른 Mg-Al 합금의 플라즈마 전해 산화 피막 특성

이두형; 김보식; 장시영; Du Hyung Lee; Bo Sik Kim; Si Young Chang

Korean Journal of Materials Research, Vol.18, No.5, 241-246, May, 2008

DOI10.3740/MRSK.2008.18.5.241 Export Citation

피막처리 시간에 따른 Mg-Al 합금의 플라즈마 전해 산화 피막 특성

Characteristics of Plasma Electrolytic Oxide Coatings on Mg-Al Alloy with Coating Time

이두형, 김보식, 장시영 ^†

한국항공대학교 항공재료공학과

Du Hyung Lee, Bo Sik Kim, and Si Young Chang^†

Department of Materials Engineering, Korea Aerospace University, Gyeonggi-do 412-791, Korea

E-mail:

Pure Mg and Mg-6wt.%Al alloy were coated by the plasma electrolytic oxidation with various coating times and the microstructural and mechanical characteristics of the coatings were investigated. The coatings on pure Mg and Mg-6wt.%Al alloy consisted of MgO and Mg2SiO4. The surface roughness and thickness of the coatings became larger as the coating time increased. The coatings on the Mg-6wt.%Al alloy were more uniform and thicker than those on pure Mg. The microhardness and friction coefficient of the coatings increased progressively as the coating time increased. In addition, the coatings on the Mg-6wt.%Al alloy compared to pure Mg showed improved microhardness and a better friction coefficient.

Keywords:Plasma electrolytic oxidation;Mg-Al alloy;thickness;microhardness;friction coefficient

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[Related Articles]

[1] Kojima Y, Komado S, Mater. Sci. Forum, 488, 9 (2005)

[2] Yue TM, Hu QW, Mei Z, Man HC, Mater. Lett., 47, 165 (2001)

[3] Smith WF, Structure and Properties of Engineering Alloys, 2nd ed., p.541, McGraw-Hill Science, New York, U.S.A., (1993). (1993)

[4] Guo HF, An MZ, Huo HB, Xu S, Wu LJ, Appl. Surf. Sci., 252(22), 7911 (2006)

[5] Avedisian M, Baker H, ASM Specialty Handbook, p.194, ASM International, Ohio, USA, (1999). (1999)

[6] Sakkinen DJ, SAE Techical Paper Series, 940779, 72 (1994). (1994)

[7] Bohlen J, Chmelik F, Dobro P, Letzig D, Lukac P, Kainer KU, J. Alloy & Compounds., 378, 214 (2004)

[8] Guo H, An M, Xu S, Huo H, Mater. Lett., 60, 1538 (2006)

[9] Hsiao HY, Tsung HC, Tsai WT, Surf. Coat. Tech., 199, 127 (2005)

[10] Barbosaa DP, Knornschilda G, Strunkb HP, Mater. Res., 6, 103 (2003)

[11] Montero I, Fernandez M, Albella JM, Electrochem. Acta, 32, 171 (1987)

[12] Ikonopisov S, Electrochem. Acta, 22, 1077 (1977)

[13] Yerokhin AL, Nie X, Leyland A, Matthews A, Dowey SJ, Surf. Coat. Tech., 122, 73 (1999)

[14] Yerokhin AL, Nie XD, Leyland A, Matthews A, Surf. Coat. Tech., 130, 195 (2000)

[15] Curran JA, Clyne TW, Surf. Coat. Tech., 199, 177 (2005)

[16] Japan Inst. of Magnesium, Handbook of Advanced Magnesium Technology, p.343, Kallos Publishing Co., Tokyo, Japan, (2000). (2000)

[17] Liang J, Guo BG, Tian J, Liu HW, Zhou JF, Xu T, Appl. Surf. Sci., 252(2), 345 (2005)

[18] Duan H, Yan C, Wang F, Electrochem. Acta, 52, 249 (2007)

[19] Wu ZQ, Xia Y, Li G, Xu FT, Appl. Surf. Sci., 253(20), 8398 (2007)