Abstract
A study of the chemical changes on the surface of room temperature vulcanizing (RTV) silicone rubber coatings applied to electrical insulators is reported. The coatings have been subjected to electrical stress in the presence of salt-fog. Contact angle measurements, attenuated total reflection Fourier Transform Infrared (ATR-FTIR) spectroscopy and x-ray photoelectron spectroscopy (XPS/ESCA) were employed. The surface free energies due to London dispersion and hydrogen bonding forces on the surface of RTV coatings were calculated from the contact angle measurements using water and methylene iodide. Good agreement was obtained with the literature value for a virgin RTV surface. The chemical changes of the surface are shown to be responsbile for the loss of hydrophobicity.
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