# US 2024/0189945 A1 · Method for preparing superhydrophobic surface of aluminum alloy through laser peening

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- Number: US 2024/0189945 A1
- Document ID: US20240189945A1
- Status: Published application
- Kind: A1
- Application number: 18/286,758
- Filed: 2022-07-08
- Published: 2024-06-13
- Earliest claimed: 2021-12-01
- Assignees: Jiangsu University
- Applicants: Jiangsu University
- Inventors: Jianzhong ZHOU; Yanqiang GOU; Xiankai MENG; Shu HUANG; Pengfei LI; Li LI; Gaoqiang JIANG; Xu FENG
- Web page: https://patentgrep.com/patent/US20240189945A1

## CPC

- B23K 26/356: by shock processing
- C21D 10/005: {by laser shock processing}
- C22C 21/00: Alloys based on aluminium
- C23C 22/02: using non-aqueous solutions
- C23C 22/05: using aqueous solutions
- B23K 2101/35: {Surface treated articles}
- B23K 2103/10: Aluminium or alloys thereof
- C23C 2222/20: Use of solutions containing silanes
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)

## Abstract

The present disclosure provides a method for preparing a superhydrophobic surface of an aluminum alloy through laser peening, including the following steps: coating a surface of the aluminum alloy as an absorption layer with an organic component-containing confinement layer to obtain a coated aluminum alloy, where the organic component-containing confinement layer is a mixed organic solution including 5 mL to 10 mL of perfluorooctyltriethoxysilane (FOTS), 100 mL to 200 mL of absolute ethanol, and 30 mL to 50 mL of distilled water; and subjecting a surface of the coated aluminum alloy to the laser peening to form the superhydrophobic surface.

## Claims

### Claim 1

A method for preparing a superhydrophobic surface of an aluminum alloy through laser peening, comprising the following steps:
coating a surface of the aluminum alloy as an absorption layer with an organic component-containing confinement layer to obtain a coated aluminum alloy, wherein the organic component-containing confinement layer is a mixed organic solution comprising 5 mL to 10 mL of perfluorooctyltriethoxysilane, 100 mL to 200 mL of absolute ethanol, and 30 mL to 50 mL of distilled water; and subjecting a surface of the coated aluminum alloy to the laser peening to form the superhydrophobic surface, wherein due to a thermal effect of the laser peening and an ultra-high temperature and ultra-high pressure environment produced, the surface of the aluminum alloy reacts with an organic substance in the confinement layer, such that a low-free-energy functional group is bonded to the surface of the aluminum alloy to reduce a surface energy of the aluminum alloy, and a combined action of a resulting porous micro/nano structure and a reduced surface energy makes the surface of the aluminum alloy have a superhydrophobic effect.

### Claim 2 (depends on 1)

The method for preparing the superhydrophobic surface of the aluminum alloy through the laser peening according to claim 1, further comprising the following step: drying a surface of an aluminum alloy workpiece obtained after the laser peening at a constant temperature to improve bonding of a surface material to the low-free-energy functional group.

### Claim 3 (depends on 2)

The method for preparing the superhydrophobic surface of the aluminum alloy through the laser peening according to claim 2, wherein the surface of the aluminum alloy workpiece is incubated for 10 min to 20 min in an environment at 80° C. to 100° C.

### Claim 4 (depends on 1)

The method for preparing the superhydrophobic surface of the aluminum alloy through the laser peening according to claim 1, wherein a spot size of the laser peening is 0.5 mm to 2 mm, a shock manner of the laser peening is multi-point-lap large-area shock, and a lap rate of the laser peening is 30% to 80%.

### Claim 5 (depends on 1)

The method for preparing the superhydrophobic surface of the aluminum alloy through the laser peening according to claim 1, wherein the laser peening is conducted with a laser beam wavelength of 1,064 nm, a pulse width of 8 ns, a repetition frequency of 1 Hz to 10 Hz, a single pulse energy of 2 J, and a Gaussian distribution.