Electrochemical Properties of Anodized and Sealed Aluminum Films

Abstract:

The electrochemical behaviors of anodized and sealed aluminum alloys in NaCl solution were studied by potentiodynamic polarization, the open-circuit-potential and EIS. The results show that anodic oxidization of aluminum increases its corrosion resistance greatly. Different sealing methods have different influences on corrosion behavior of the anodized alloys in NaCl solution; corrosion resistance increases in the order: no sealing < water sealing < dichromate sealing < nickel fluoride sealing. The modulus of the porous film sealed by dichromate solution increases with the immersion time in NaCl solution, which is similar to the self-sealing effect of unsealed anodic films.

• Periodical: Advanced Materials Research (Volumes 11-12)
• Pages: 433-436
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.11-12.433
• Online since: February 2006
• Authors: Xu Hui Zhao, Lian Peng Tian, Jing Mao Zhao, Yu Zuo
• Keywords: Aluminum (Al), Anodic Film, Corrosion Resistance, Electrochemical Impedance Spectroscopy (EIS)

References

[1] T.P. Hoar and G.C. Wood: Electrochim. Acta Vol. 7 (1962), p.333.

[2] G.E. Thompson: Thin Solid Films Vol. 297 (1997), p.192.

[3] Y. Zuo, P.H.Z. Penghui and J.M. Zhao: Surf. Coat. Tech. Vol. 166 (2003), p.237.

[4] J.J. Ren and Y. Zuo: Surf. Coat. Tech. Vol. 191 (2005), p.311.

[5] J.A. Gonzalez, S. Feliu, J.A. Bautista and E. Otero: J. Appl. Electrochem. Vol. 29 (1999), p.845.

[6] J.J. Suay, E. Gimenez, T. Rodruez, K. Habbib and J.J. Saura: Corr. Sci. Vol. 45 (2003), p.611.

[7] J.A. Gonzalez, V. Lopez, E. Otero and J.A. Bautista: J. Electrochem. Soc. Vol. 147 (2000), p.984.

[8] F. Mansfeld and M.W. Kendig: J. Electrochem. Soc. Vol. 135 (1988), p.828.

[9] J.A. Gonzalez, V. Lopez, A. Bautista and E. Otero: J. Appl. Electrochem. Vol. 29 (1999), p.229. Fig. 5. Bode plots of the anodic films sealed in potassium dichromate solution.

[10] -2.

[10] -1.

[10] [0] [10] [1] [10] [2] [10] [3] [10] [4] [10] [5] [10] [1] [10] [2] [10] [3] [10] [4] [10] [5] [10] [6] [10] [7] [10] [8] a sealed in K2Cr2O7 Z module / Ω. cm.

DOI: 10.7717/peerj.4623/fig-6

[2] Frequency / Hz.

[1] day.

[13] days.

[60] days 110 days 150 days 10-2 10-1 100 101 102 103.

[10] [4] [10] [5] [0] [20] [40] [60] [80] 100 sealed in K2Cr2O7 Frequency / Hz.

[1] day.

[13] days.

[60] days 110 days 150 days b Phase angle / degree.