About The Journal
  Aims and Scope
  Editorial Board
  Submit a Manuscript 
  Subscription Information
  Guidelines for Publication
  Ethics
Articles & Issues
  Search
  Issue
  Online First
  KJChE on
For Authors
  Instructions to Authors
  Ethical Responsibilities of
  Authors in KJChE
  Ethics in Publishing
  Peer Review Process
  Author's Checklist
  Copyright Transfer Form
Contact us
 
 
 
Issue
Korean Journal of Chemical Engineering,
Vol.21, No.4, 915-920, 2004
Sealing Effects of Anodic Oxide Films Formed on Mg-Al Alloys
Kim SJ, Kim JI, Okido M
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.
Keywords: AZ91; Anodizing; NaOH Solution; Sealing; Corrosion Resistance
[References]
  1. Altenphol DG, Corrosion, 18, 43, 1962
  2. Wood GC, O'Sullivan JP, J. Electrochem. Soc., 116, 1351, 1969
  3. Hasumi A, Itoi T, Sato E, J. Jpn. Inst. Light Metals, 30, 437, 1980
  4. Hwang SK, Jeong SH, Hwang HY, Lee OJ, Lee KH, Korean J. Chem. Eng., 19(3), 467, 2002
  5. Murpy JF, Aluminum, 3, 1967
  6. Kawase H, J. Jpn. Inst. Light Metals, 21, 12, 1971
  7. Kawase H, J. Jpn. Inst. Light Metals, 21, 120, 1971
  8. Khaselev O, Yahalon J, Corros. Sci., 40, 1149, 1998
  9. Kim SJ, Okido M, Mizutani Y, Ichino R, Tanikawa S, Hasegawa S, Mater. Trans., 44, 1036, 2003
  10. Kim SJ, Mizutani R, Ichino R, Okido M, Tanikawa S, Bull. Korean Chem. Soc., 24, 975, 2003
  11. Kim SJ, Okido M, Mizutani Y, Ichino R, TMS, 3, 31, 2003
  12. Koda M, Takahashi H, Nagatama M, J. Surf. Finishing Soc. Jpn., 33, 242, 1982
  13. Koda M, Takahashi H, Nagayama M, J. Surf. Finishing Soc. Jpn., 36, 27, 1985
  14. Mizutani Y, Kim SJ, Ichino R, Okido M, Surf. Coat. Technol., 169-170, 143, 2003
  15. 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
  16. 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
  17. Ono S, Kijima H, Masuko N, J. Jpn. Inst. Light Metals, 52, 115, 2002
  18. Ono S, Kijima H, Masuko N, J. Surf. Finishing Soc. Jpn., 51, 1168, 2000
  19. The Institute of Japan Magnesium, "Handbook of Advanced Magnesium Technology," Kallos Publishing Co., LTD, 311, 2000
[Cited By]
  1. Ozyilmaz AT, Ozyilmaz G, Yilmaz E, Colak N, Korean Journal of Chemical Engineering, 25(4), 846, 2008
참고문헌정보(참고문헌, 인용문헌)는 화학공학소재연구정보센터에 의해 제공되고 있습니다.