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Modified aluminum substrate surface and preparation method and application thereof

A technology of aluminum substrate and aluminum surface, applied in the field of modified aluminum substrate surface and its preparation, can solve the problems of complex processing technology, low processing efficiency, low condensation efficiency, etc., and achieves simple process, convenient operation, improved The effect of condensation efficiency

Inactive Publication Date: 2019-04-09
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have not completely broken through the traditional chemical etching surface treatment process. After adopting the laser processing process, chemical etching is further used to gradually form a low surface energy film on the surface. The processing process is complicated. In order to effectively obtain a super-hydrophobic surface, It is also necessary to modify the surface with low surface energy substances, the processing efficiency is not high and the condensation efficiency is not high

Method used

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  • Modified aluminum substrate surface and preparation method and application thereof
  • Modified aluminum substrate surface and preparation method and application thereof
  • Modified aluminum substrate surface and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0037] An embodiment of the present invention provides a modified aluminum substrate surface and a preparation method thereof, the method comprising the following steps:

[0038] Step 1. Polish 1050 aluminum, select a metallographic sample pre-grinding machine with a power of 370W, a grinding disc speed of 450 rpm, and a grinding disc diameter of 230mm. The polishing process requires auxiliary SiC water sandpaper with a diameter of 200mm and 1200 mesh in the The aluminum surface is polished, and the polishing range is 100cm 2 , the polishing time is 10 minutes, and the aluminum sample after surface polishing is obtained;

[0039] The aluminum sample after described surface polishing is cleaned with ultrasonic cleaner, and the ultrasonic frequency of ultrasonic cleaner is 40kHz, submerges sample surface with the deionized water of resistivity 18.25 megohms at room temperature, cleans continuously for 30 minutes, and then with ethanol Cleaning, after cleaning, take out the samp...

Embodiment 2

[0044] In the method for preparing the surface of the modified aluminum substrate in this embodiment, the pulse width of the laser described in step 2 and step 3 is 240 ns, the single pulse energy is 0.12 mJ, and the repetition frequency is 450 kHz, and the laser scan uses an X-Y scanning galvanometer , making the laser beam ablate the surface of the aluminum product row by row at a scanning speed of 5575mm / s; the rest are the same as in Example 1.

Embodiment 3

[0046] The method for preparing the surface of the modified aluminum substrate in this embodiment, except that the pulse width of the laser described in step 2 and step 3 is 240ns, the single pulse energy is 0.375mJ, and the repetition frequency is 160kHz, and the laser scanning uses an X-Y scanning galvanometer , making the laser beam ablate the surface of the aluminum product row by row at a scanning speed of 1666.7mm / s; the rest are the same as in Example 1.

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Abstract

The invention provides a modified aluminum substrate surface and a preparation method and application thereof. The method comprises the following steps that (1) polishing pretreatment is carried out on the aluminum surface to be treated, and a clean aluminum sample with the polished surface is obtained after washing and drying are carried out; (2) a pulsed laser is adopted for conducting laser scanning treatment on the surface of the obtained aluminum sample, a plurality of micro-nano structures are machined on the surface of the sample, the micro-nano structures are placed in an electric vacuum drying oven to be baked, and an aluminum superhydrophobic surface is obtained; and (3) the wedge-shaped or triangular parallel connection superhydrophilic surface is obtained on the obtained aluminum superhydrophobic surface through laser processing treatment, and the superhydrophobic-superhydrophilic wedge-shaped or triangular phase alternative surface is obtained. The method has no chemical modification and is simple in process, convenient to operate and low in cost, and the prepared aluminum substrate surface is the superhydrophobic-superhydrophilic wedge-shaped or triangular phase alternative surface, realization and continuous operation of the droplet condensation process are facilitated, the excellent condensation performance is achieved, the aluminum heat exchange rate is greatlyincreased, and the condensation efficiency of a condenser pipe is improved.

Description

technical field [0001] The invention relates to the technical field of surface preparation, in particular to a modified aluminum substrate surface and a preparation method thereof. Background technique [0002] The condenser tube is a device used to promote condensation, usually composed of double-layer glass tubes, which is a glass instrument that uses the principle of heat exchange to cool and condense steam into liquid. Because the diameter of the glass tube is limited, the contact area of ​​the high-temperature gas or liquid flowing through the inner tube is limited, so that the heat exchange is insufficient, and the final condensation efficiency is not high. If the size of the heat transfer equipment is increased, the condensation cost will be greatly increased. The surface of traditional condenser tubes such as glass, copper and stainless steel is hydrophilic (intrinsic contact angle is less than 90°), which is not conducive to the shedding of condensed droplets on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00F28F13/18
CPCB23P15/00F28F13/187
Inventor 娄德元曹佳丽刘庆梅胜曹剑锋刘顿郑重成健
Owner HUBEI UNIV OF TECH
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