Method for changing wettability of surface of metallic nickel through hydrofluoric acid etching

Abstract

The invention discloses a method for changing wettability of the surface of metallic nickel through hydrofluoric acid etching. The method comprises the steps that (1) an ultrasonic cleaning mode is adopted to wash the surface of the metallic nickel, and oil stains and impurities on the surface of metallic nickel sheets are removed; (2) the metallic nickel sheets are put into a hydrofluoric acid solution with the concentration being 40% or above, and then are put into a water bath with the temperature being over 30 DEG C to be subjected to chemical etching for 7-28 hours, and in the etching process, the surfaces of the metallic nickel sheets are turned once every one hour; and (3) the etched metallic nickel sheets are taken out, flushed and dried, and the metallic nickel sheets with the wettability being changed are obtained. The surface of the metallic nickel is subjected to etching treatment through the hydrofluoric acid solution, rough microcosmic structures are formed on the surface of the metallic nickel, and accordingly the wettability of the metallic nickel is changed only in the mode of improving the surface roughness, hydrophobicity of the surface of the metallic nickel is improved, then the service life of the metallic nickel under the wet or vapor condition is effectively prolonged, and the application range of the nickel is widened.

Description

Technical field [0001] The invention relates to a method for changing the wettability of the metal nickel surface, in particular to a method for changing the wettability of the metal nickel surface by hydrofluoric acid etching. Background technique [0002] The wettability of the material surface is one of the inherent properties of the material. The so-called wetting is the phenomenon in which a new solid-liquid interface replaces the previous gas-solid interface when a little liquid exists on the surface of a solid. Surface wettability is generally divided into two types: hydrophilic and hydrophobic. Hydrophilicity means that the material has an affinity for water. Generally, inorganic solids, metals and their oxides have large surface tensions. They are often called high-energy solid surfaces, which are easily wetted by liquids and have significant hydrophilicity. . Hydrophobicity means that the material has a repulsive effect on water. Generally, substances with low surfac...

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Problems solved by technology

However, these solutions basically require the introduction of low surface energy substances to improve the hydrophobicity of the substrate; they cannot directly improve the hydrophobicity of the nickel surface without changing the chemical composition of the substrate surface.

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