Journal
SURFACE & COATINGS TECHNOLOGY
Volume 203, Issue 14, Pages 1941-1946Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2009.01.030
Keywords
Icephobicity; PTFE; Anodisation; Superhydrophobicity; Aluminum
Funding
- NSERC/ Hydro-Quebec/UQAC Industrial Chair on Atmospheric Icing of Power Network Equipment (CIGELE)
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In order to protect aluminum ground wires and phase conductors of overhead power lines against ice adhesion and excessive accretion, for ensuring safe and reliable power transmission during winter periods, a new coating with icephobic characteristics and satisfactory mechanical properties was developed. The method consisted in depositing an extremely adherent poly(tetrafluoroethylene) or PTFE coating on an Al2O3 underlayer produced by anodisation in either a phosphoric or an oxalic acid electrolyte. PTFE impregnation was carried out at low temperature (320 degrees C) and coating adhesion was assessed using tape and bend tests. These treatments resulted in highly hydrophobic Surfaces with water contact angles lying between 130 and 140 degrees. Ice shear stress was reduced by almost 2.5 times, and the PTFE coatings remained active after several ice shedding events. Morphologies and chemical compositions were studied using scanning electron microscopy, energy dispersive X-Ray analysis, as well as Fourier Transform Infra Red and X-Ray photoelectron spectroscopy. (c) 2009 Elsevier B.V. All rights reserved.
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