期刊
APPLIED SURFACE SCIENCE
卷 283, 期 -, 页码 1051-1059出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2013.07.066
关键词
Sol-gel; Fluoro; Hydrophobicity; Organic-inorganic; Corrosion resistance
类别
资金
- DOW Chemicals
The development of an organic-inorganic sol-gel coating system (thickness similar to 2 mu m) on aluminum is reported. The coating uses glycidoxytrimethoxysilane (GPTMS) and methyltrimethoxysilane (MTMS) as silane precursors, crosslinked with hexamethylmethoxymelamine (HMMM) and followed by hydrophobic modification using a water base short chain per-fluoro emulsion (FE). Such coating resulted in enhanced hydrophobicity with a contact angle of about 120 degrees and sliding angle of 25 degrees for a 20 mu L water droplet. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements showed reduced corrosion upon coated substrates than the bare; correlated with both a higher degree of water repellency and formation of low permeable crosslinked sol-gel network. The structure of the coatings deposited was analyzed using Fourier transform infrared (FTIR) and X-ray photoelectron (XPS) spectroscopy, revealing replacement of hydrophillic surface hydroxyls groups with low energy per-fluoro groups. (C) 2013 Elsevier B.V. All rights reserved.
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