Impedance Behavior of the Composite Coatings Prepared on Magnesium Alloy AZ91 in Simulated Seawater Solution

Abstract:

The composite coatings were obtained on a magnesium alloy by micro-arc oxidation and sol-gel technique. Electrochemical impedance spectroscopy (EIS) was used to evaluate the corrosion behavior of MAO coating and composite coatings in a simulated seawater solution. The results show that corrosion behavior of the MAO coating and composite coatings are different at different immersion times. Corrosion protection of the MAO coating gradually weaken with the extension of soaking time, but corrosion protection of the composite coatings become stronger first and then weaken.

• Periodical: Advanced Materials Research (Volume 900)
• Pages: 526-530
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.900.526
• Online since: February 2014
• Authors: Wei Shang, Zhou Lan Yin*, Yu Qing Wen, Xu Feng Wang
• Keywords: Composite Coating, Impedance Behavior, Magnesium Alloy, Simulated Seawater Solution

References

[1] Baril G, Pebere N, Corrosion Science Vol. 43(2001), p.471.

[2] Inoue H, Sugahara K, Yamamoto A, Corrosion Science Vol. 44(2002), p.603.

[3] Mathieu S, Rapin C, Steinmetz J, Corrosion Science Vol. 45(2003), p.2741.

[4] Zidoune M, Grosjean M H, Roue L, Corrosion Science Vol. 46(2004), p.3041.

[5] Altun H, Sen S, Materials and Design Vol. 25(2004), p.637.

[6] Zhang Y, Yan C, Wang F, Surface and Coatings Technology Vol. 161(2002), p.36.

[7] Ma Y, Nie X, Northwood D O, Thin Solid Films Vol. 469-470 (2004), p.472.

[8] H.F. Guo, M.Z. An, X. Xu, Journal of Materials Engineering Vol. 0 (2006), p.29 (in chinese).