Structural Characterization and Corrosion Properties of BTESPT Silane Films on Surface of 2024-T6 Aluminium Alloy

Abstract:

2024-T6 Al alloy sheet s were modified by bis-[triethoxysilylpropyl] tetrasulfide (BTESPT) silane film to improve the corrosion resistance. Fourier-Transform Reflection Absorption (FTIR-RA) spectroscopy was used for structural characterization of BTESPT silane film formed on surface of the sheet. Potentiodynamic polarization and immersion test in 3.5% NaCl solution were used for evaluating the corrosion performances of the silane film. The results showed that the film formed after curing at 120 °C for 40 min was cross-linked through Si-O-Si and that it was covered on the entire surface of the sheet. The content of elements S and Si on the Al2CuMg particles is a little higher that of on the matrix. The strong peak at 1032 cm-1 indicated that the film was linked to the sheet by Si-O-Al. Compared to the untreated case, the corrosion current density of the sheet treated with the silane film was reduced by close to 2 orders. Treatment of BTESPT silane can provide about 670 h protection of corrosion for the sheet in 3.5% NaCl water solution.

• Periodical: Materials Science Forum (Volumes 546-549)
• Pages: 1111-1116
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.546-549.1111
• Online since: May 2007
• Authors: Ming An Chen, Xuan Xie, Guo Fu Xu, Hui Zhong Li, Xin Ming Zhang
• Keywords: Aluminium Alloy, Corrosion, Film, Silane Coupling Agent

References

[1] E. P. Plueddemann: Silane Coupling Agents (Plenum Press, USA 1991).

[2] D. Q. Zhu, W. J. van Ooij: Corrosion Science Vol. 45 (2003), p.2163.

[3] D. Q. Zhu, W. J. van Ooij: Corrosion Science Vol. 45 (2003), p.2177.

[4] W. J. van Ooij, D. Q. Zhu: Corrosion Vol. 57 (2001), p.413.

[5] D. Q. Zhu, W. J. van Ooij: Electrochim Acta Vol. 49 (2004), p.1113.

[6] J. Song, W. J. van Ooij: J. Adhe. Sci. Technol. Vol. 16 (2003), p.2191.

[7] V. Subramanian, W. J. van Ooij: Surf. Engineering Vol. 15 (1999), p.168.

[8] M. F. Montemor, A. Rosqvist, H. Fagerholm, M. G. S. Ferreira: Prog. In Org. Coat. Vol. 51 (2004), p.188.

[9] A. Cabral, R. G. Duarte, M. F. Montemor, M. L. Zheludkevich, M. G. S. Ferreira: Corrosion Science Vol. 47 (2005), p.869.

[10] W. Trabelsi, E. Triki, L. Dhouibi, M. G. S. Ferreira, M. L. Zheludkevich, M. F. Montemor: Surf. Coat. Tech. Vol. 200 (2006), p.4240.

[11] A. M. Cabral, R. G. Duarte, M. F. Montemor, M. G. S. Ferreira: Prog. In Org. Coat. Vol. 54 (2005), p.322.

[12] S. K. Jayaseelan, W. J. van Ooij: J. Adhe. Sci. Technol. Vol. 15 (2001), p.967.