Influences of Tannic Acid Concentration on Properties of Micro-Arc Coatings Formed on AZ91 Magnesium Alloys

Abstract:

Anodic coatings were prepared by micro-arc oxidation on AZ91 magnesium alloys with the addition of 0-8 g/L tannic acid. The influences of tannic acid concentration on the conductivity and coating properties were studied. The result shows that with the increase of tannic acid concentration, the solution conductivity decreases and the coating color becomes dark. In the solution with 4 g/L tannic acid, the obtained coatings are the most uniform and achieve the best corrosion resistance.

• Periodical: Applied Mechanics and Materials (Volumes 182-183)
• Pages: 297-301
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.182-183.297
• Online since: June 2012
• Authors: Shu Fang Zhang, Rong Fa Zhang, Tao Wang, Shun Shun Yao, Zhi Hua Chen
• Keywords: Corrosion Resistance, Magnesium Alloy, MAO, Tannic Acid

References

[1] Fanya Jin, Paul K. Chu, Guidong Xu, ect. Mater. Sci. Eng., A 435-436 (2006) 123-126.

[2] Rongfa Zhang, Dayong Shan, Enhou Han, Shibo Guo. Trans. Nonferrous Met. Soc. China 16(2006) s685-s688.

[3] H.F. Guo, M.Z. An, S. Xu, Mater. Lett. (2005) 1-4.

[4] H.F. Guo, M.Z. An, Appl. Surf. Sci. 246(2005), 229-238.

[5] Fei Chen, Hai Zhou, Bin Yao, Zhen Qin, Qingfeng Zhang. Surf. Coat. Technol. 201 (2007) 4905-4908.

[6] Yanhua Wang, Jia Wang, Jibiao Zhang, ect. Materials Letters 60 (2006)474-478.

[7] X. Nie, A. Leyland, H.W. Song, A.L. Yerokhin S.J. Dowey, A. Matthews. Surf. Coat. Technol. 116-119 (1999) 1055-1060.

DOI: 10.1016/s0257-8972(99)00089-4

[8] Fang Zhao, Ai-di Liao, Rong-fa Zhang, ect. Trans. Nonferrous Met. Soc. China 20 (2010) s683-s687.

[9] Chenggen Xie, Hua Cui. Water Res. 37 (2003) 233–237.

[10] Xiaoming Chen, Guangyu Li, Jianshe Lian, Qing Jiang. Surf. Coat. Technol. 204(2009)736-747.