Preparation technology for super-hydrophobic surface of 7075 aluminum alloy

Abstract

The invention discloses a preparation technology for the super-hydrophobic surface of a 7075 aluminum alloy, and belongs to the field of electrodeposition application. The problems of super-hydrophobic structure preparing are solved. The preparation technology comprises the following steps that the surface of the aluminum alloy is ground through metallographic sandpaper to be smooth; the ground workpiece surface is polished through a metallographic sample polishing machine, and put into deionized water to be ultrasonically washed; a pit-shaped structure is constructed in the polished workpiecesurface through a laser marking machine, and the polished workpiece surface is placed in the deionized water to be ultrasonically washed and dried; a workpiece substrate subjected to laser treatmentis subjected to nickel ion electrodeposition, and placed in the deionized water to be ultrasonically washed, wherein the electrodeposition time of the workpiece is controlled at about 4 min, and the components of a plating solution comprise NiSO4.6H2O, ammonium citrate tribasic, ammonium hydroxide and ammonium acetate; and the deposited surface is placed in a dry box to be heated at the temperature of 150 DEG C, heat preservation is conducted for 2 hours, and the surface is cooled along with a furnace to the room temperature. The hydrophobicity of the surface reaches better, and the hydrophobic contact angle of the surface subjected to laser electrodeposition composite preparation reaches 152 degrees.

Description

technical field [0001] The invention belongs to the application field of electrodeposition, and in particular relates to a preparation process for a 7075 aluminum alloy superhydrophobic surface. Background technique [0002] In chemistry, hydrophobicity refers to the physical property of a molecule (hydrophobe) and water to repel each other. Examples of hydrophobic molecules include alkanes, oils, fats and most substances containing grease. [0003] Previously, our research group used 6061 aluminum alloy as the substrate to prepare a hydrophobic self-cleaning surface by brush plating and laser composite processing. The specific method is as follows: firstly use brush plating technology to deposit nickel ions on polished aluminum alloy with DC power supply to obtain nickel coating structure, and then use laser technology to construct groove structure on the surface prepared by brush plating to obtain mastoid and groove phase bound hydrophobic composite surface. [0004] Ho...

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Problems solved by technology

[0004] However, in the follow-up research and development process, it was found that although the hydrophobic effect of the existing hydrophobic self-cleaning surface is already very good, it has not achieved the super-hydrophobic effect.

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