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Citation: CHEN Ming-An, XIE Xuan, QI Hai-Ying, ZHANG Xin-Ming, LI Hui-Zhong, YANG Xi. Characterization of Self-assembled Bis-[triethoxysilylpropyl]tetrasulfide Silane Films on Surface of 2A12-T6 Aluminum Alloy[J]. Acta Physico-Chimica Sinica, ;2006, 22(08): 1025-1029. doi: 10.3866/PKU.WHXB20060823 shu

Characterization of Self-assembled Bis-[triethoxysilylpropyl]tetrasulfide Silane Films on Surface of 2A12-T6 Aluminum Alloy

1.
School of Materials Science and Engineering, Central South University, Changsha 410083 P.R.China

Received Date: 10 February 2006
Available Online: 7 July 2006

Bis-[triethoxysilylpropyl] tetrasulfide silane films were self-assembled on surface of 2A12-T6 aluminum alloy for corrosion protection. The structure of the formed silane films was investigated by using Fourier transform infra-red (FTIR) spectroscopy, and the corrosion performance of the film was evaluated by electrochemical potentiodynamic polarization tests in 3.5% NaCl solution. Compared to the untreated case, both the cathodic and anodic reactions of Al 2A12-T6 treated with the silane films are inhibited obviously. For the film on the surface of Al 2A12-T6 aged at room temperature the corrosion current density is reduced by more than 1 order of magnitude, which is due to the hydrogen bonding between silane molecules and surface of 2A12-T6. For the film on the surface of Al 2A12-T6 cured at temperature of 120 ℃ for 40 min the silane molecules are cross linked through SiOSi, which is closely linked to Al 2A12-T6 surface through formation of SiOAl. The corrosion current density is reduced by more than 2 orders of magnitude. There exist more hydrogen bonded hydroxy groups in the cured film dipped for 10 min in the prepared silane solution than that dipped for 2 s to 1 min.
- Aluminium alloy;Bis-[triethoxysilylpropyl]tetrasulfide;Fourier transform infra-red;Film;Corrosion
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