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MPTES copper film surface preparation and corrosion resistance

Author: LuXueBin
Tutor: ChenMingAn
School: Central South University
Course: Materials Processing Engineering
Keywords: copper silane corrosion FTIR EIS
CLC: TB383.2
Type: Master's thesis
Year: 2011
Downloads: 54
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Abstract


Films of (3-mercaptopropyl)triethoxysilane (MPTES) with different solution pH value or different hydrolysis time were formed on copper surface. Fourier transform infrared spectroscopy (FTIR) was used for structural characterization of MPTES films. Polarization curves, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry measurements were used for evaluating the corrosion protective performance of MPTES films. Scanning electron microscope (SEM) and FTIR analysis were used for characterization of surface morphology and structures of the films after immersion in 3.5%(w) NaCl solution. The results are as follows:The hydrolysis degree of MPTES in acid silane solution is higher than that in basic silane solution. The film obtained in acid silane solution contains more Si-O-Si bonds and shows better corrosion protective performance.At least 24 hours are required to obtain a well hydrolyzed silane solution in acid condition. The MPTES film obtained in the 2 h hydrolyzed solution contains a number of defects, while the films obtained in long time hydrolyzed solutions are dominated with long chain Si-O-Si units and contain fewer defects. Compared with the bare copper, the corrosion current density of the specimen covered with 2 h hydrolyzed film is reduced by 1-2 orders of magnitude, while the films with longer hydrolysis time cause a decrease by about 3 orders of magnitude. The MPTES film obtained in 48 h hydrolyzed solution shows the best corrosion protective performance in cyclic voltammetry and EIS measurements.After 1 week of immersion in NaCl solution, pitting occurs on the surface of copper covered by 2 h hydrolyzed MPTES film; after 4 weeks the corrosion become more severe. For 48 h hydrolyzed sample no corrosion can be observed after 1 week but pitting occurs after 4 weeks. The Si-O-Si bonds in MPTES films are partly broken after immersion.

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