Preparation method for superamphiphobic surface of aluminum and alloy thereof

Abstract

The present invention relates to a preparation method for a superamphiphobic surface of aluminum and an alloy thereof. According to the present invention, a two-step method is adopted to prepare a superhydrophobic surface, and a low surface energy material is adopted to modify the hydrophobic surface, wherein an electrochemical etching method is adopted to prepare an aluminum micron-scale rough surface, then a hydrothermal synthesis method is adopted to synthesize a zinc oxide micro-nano double rough structure, and the prepared superhydrophobic surface provides a contact angle of more than 156 DEG for water, and provides an oleophobic angle of more than 150 DEG C for lubricating oil; and the method has the following characteristics that: simpleness and practicality are provided, equipment requirements are low, the used electrochemical etching technology and the used hydrothermal synthesis technology are mature, the large-area superamphiphobic surface is easily prepared, and industrial manufacturing is easily achieved.

Description

technical field

[0001] The invention belongs to the technical field of metal surface treatment and modification thereof, and in particular relates to a method for preparing a superamphiphobic surface of aluminum and its alloys. Background technique

[0002] Wettability is an important interfacial phenomenon on solid surfaces, and the degree of surface wetting depends on its chemical composition, microscopic morphology and geometric structure. There are two main factors affecting the wettability of solid surfaces: (1) surface free energy; (2) surface roughness. When the surface free energy is reduced, its hydrophobic properties are enhanced. However, even a smooth surface with the lowest surface energy has a contact angle of only 119° with water. In order to get a better hydrophobic effect, the surface needs to have a certain roughness. A surface that is both hydrophobic and oleophobic is an amphobic surface, and a surface that has a contact angle with both water and oil g...