Carpet-like zinc films with unique nanowires are fabricated by using a simple physical evaporation method. The definite morphologies of the films endow the superhydrophobic material with a contact angle of about 157.9 ∘ , and by additional modification of CF3(CF2)7CH2CH2Si(OCH3)3 the water adhesive force could be tuned from 58.3 𝜇N to 14.6 𝜇N. In order to analyze the controllable adhesion of superhydrophobic Zn films, we study the microstructure and chemical compositions of the films by x-ray diffraction SEM, TEM, HRTEM and EDAX. Furthermore, a model based on the balance of micro-surface energy is proposed to illustrate the relationship of the geometry and wettability properties of the films. The model provides new insights into how to designoriented microchannels and micro-protuberance on material surfaces, which is of benefit for controlling their ability of caught-collection in air bubbles and water-pinning collection.
To study the corrosion of old 220kV transmission lines especially conductor in Shanghai, methods as visual inspection andmetallographic analysis are used to conduct an experimental research on the atmospheric corrosion of old conductors. The appearances and metallographic structures of conductors in service are examined and their mechanical property indicators are analyzed.Based on the corrosion mechanism of aluminum and galvanized steel wires, the research on the corrosion of ACSR which has run for years concludes that the outer aluminum wires of the 220kV old conductors that have operated for years are more corroded than the inner wires and the resistivity exceeds the standards although there is no significant drop in the mechanical indicators. The results in this research can provide technical support and guidance for the life evaluation of old transmission lines in the country.
The corrosion conditions of in-service aluminum conductor steel reinforced (ACSR) overhead lines in typical climate were studied by using macroscopic and microscopic methods. According to its operating environment, the corrosion causes were also analyzed. It is found that the corrosion of the outer aluminum stranded conductors is more serious than other parts. And partial corrosion pits have been found on the outer layers of aluminum stranded conductors. While there is no obvious corrosion appeared on the steel core matrix. Additionally, corrosion products can reduce the corrosion rate of aluminum stranded conductors but accelerate corrosion of the steel core. Through this research, more attention should be paid to monitor the aluminum stranded conductors.
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