The icing hazard of outdoor equipment seriously threatens stable operation of power grid. The slippery surface has the possibility of application in the fields of antifouling, anticorrosion and anti-icing due to its water droplet sliding performance. In this study, the slippery surface was prepared on the surface of 7075-T651 aluminum alloy by anodic oxidation method, and the static and dynamic anti-icing properties of aluminum alloy slippery surface were studied. The results show that the ice adhesive strength of the prepared slippery surface is as low as 6 kPa. The icing time of the slippery surface is 5700 s, and the complete frosting time is 3000 s. The slippery surface exhibits excellent dynamic anti-icing performance, and its icing weight is 61 g. This study provides useful information for the application of aluminum alloy slippery surface in the field of anti-icing.
The icing on overhead transmission lines plagues the electricity industry. Superhydrophobic anodized Aluminum-conductor steel-reinforced was successfully prepared by designing the cylindrical cathode and changing the additive concentration of ethylene glycol. Results show that increased addition of ethylene glycol can mitigate the vigorous dissolution of nanopores structure. This is beneficial to the formation of uniform nanopores structure and thicker anodic oxide film. The additive concentration of 10% forms the most intact nanopore structure of good superhydrophobicity (154.1°) and low ice adhesion (6.5 kPa). The prepared superhydrophobic Al conductors show good application in the anti-icing overhead lines.
Frost and icing on transmission lines threaten the operational safety and efficiency of power system. Superhydrophobic (SHP) surfaces are considered as extremely promising anti-icing materials. The key to the anti-icing/frosting performance of SHP surfaces is to maintain Cassie condensation in low temperature and high humidity environments. Herein, the anti-frost mechanism of condensed droplets with Cassie state on the SHP surface was researched. 1060 aluminum plate with the same composition as the transmission aluminum conductor was used as the substrate. The SHP surfaces were prepared by anodic oxidation technique and low surface energy modification. The contact and roll angles of the SHP surface were 166.5° and 0.5°, respectively. Compared with the untreated surface, the frosting time of the SHP surface reached 180 min, which greatly delayed the formation and growth of frost. During the frosting process, the condensed droplets combined with each other, self-migrated and bounced on the surface with a high contact angle. This reduces the number of condensate droplets, increases the droplet spacing, and reduces the heat exchange between the solid and liquid, thus delaying the formation and growth of frost. Therefore, this study provides useful information for the development of anti-frost strategies for transmission aluminum conductors.
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