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Received February 4, 2004
Accepted April 6, 2004
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Sealing Effects of Anodic Oxide Films Formed on Mg-Al Alloys
Division of Marine Engineering, Mokpo Maritime University, Chukkyo-Dong, Mokpo, Chonnam 530-729, Korea 1Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
ksj@mmu.ac.kr
Korean Journal of Chemical Engineering, July 2004, 21(4), 915-920(6), 10.1007/BF02705540
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Abstract
Mg alloys were anodized in alkaline NaOH solutions with various additives as a non-chromate method. Specimen AZ91 was anodized at a potential that produced a strong surface dissolution reaction and generated a large amount of Mg(OH)2. The effect of sealing after anodizing was investigated, focusing on the effects of sealing time, temperature and solution conditions. The current density decreased with increasing Al(OH)3 concentration in 1 M NaOH solution during anodizing; sparking occurred at potentials above 80 V. The best corrosion resistance with anodizing in 1M NaOH solution occurred at a potential of 4 V, which caused the strongest active dissolution reaction. The sealing effect improved with increasing time and temperature, and corrosion resistance was proportional to the relative ratio of Mg(OH)2. If the oxygen thickness observed by EDX equaled the film thickness, the film formed at 4 V in 1 M NaOH was 10-15 mm thickness. The optimum corrosion resistance in sealing at various solutions after anodizing was 1M-NaOH solution.
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Mizutani Y, Kim SJ, Ichino R, Okido M, Surf. Coat. Technol., 169-170, 143 (2003)
Mizutani Y, Kim SJ, Ichino Y, Okido M, "Anodizing of Mg Alloys in Alkaline Solutions," Frontiers of Surface Engineering 2001 (6th ASFF, AEPSE 2001, 5th APIC, and 4th JKSPTFT) Conference and Exhibition, Nagoya Japan, 178 (2001)
Mizutani Y, Kim SJ, Ichino R, Okido M, Tanikawa S, Hasegawa S, "Anodizing of Mg-Al Allys and Film Characterization," Japan Institute of Light Metals, 102nd Annual Meeting Proceeding, 179 (2002)
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The Institute of Japan Magnesium, "Handbook of Advanced Magnesium Technology," Kallos Publishing Co., LTD, 311 (2000)
