Modified aluminum substrate surface and preparation method and application thereof

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...

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