阅读说明：本技术 一种在铝铜合金表面构建超疏水改性层的方法 (Method for constructing super-hydrophobic modified layer on surface of aluminum-copper alloy ) 是由 单丽梅 唐华 吴菊英 王泽忠 刘国标 于 2021-08-16 设计创作，主要内容包括：本发明公开了一种在铝铜合金表面构建超疏水改性层的方法,包括下列步骤：步骤1.将铝铜合金工件表面以砂纸进行打磨处理,去除表面氧化物膜层；冲洗干净；步骤2.将铝铜合金工件浸入以NaOH、还原性糖和水配成的刻蚀溶液中,进行化学刻蚀处理；冲洗干净；步骤3.将铝铜合金工件浸入以乙醇和低表面能物质配成的乙醇溶液中,进行表面修饰处理；冲洗干净；干燥处理,获得表面具有超疏水改性层的铝铜合金工件。本发明有效抑制了铝铜合金中的金属间化合物CuAl-(3)、Cu-(2)Al-(8)等在碱性溶液中被氧气分子氧化腐蚀,确保金属间化合物能够可靠地保留在铝铜合金表层中,在铝铜合金表面制得的超疏水改性层中含有大量的金属间化合物,抗磨损性能高,使用寿命长。(The invention discloses a method for constructing a super-hydrophobic modified layer on the surface of an aluminum-copper alloy, which comprises the following steps: step 1, polishing the surface of an aluminum-copper alloy workpiece by using abrasive paper to remove an oxide film on the surface; washing to be clean; step 2, immersing the aluminum-copper alloy workpiece into an etching solution prepared from NaOH, reducing sugar and water, and carrying out chemical etching treatment; washing to be clean; step 3, immersing the aluminum-copper alloy workpiece into an ethanol solution prepared from ethanol and a low-surface-energy substance for surface modification treatment; washing to be clean; and drying to obtain the aluminum-copper alloy workpiece with the surface provided with the super-hydrophobic modified layer. The invention effectively inhibits the intermetallic compound CuAl in the aluminum-copper alloy 3 、Cu 2 Al 8 When the metal is oxidized and corroded by oxygen molecules in alkaline solution, the intermetallic compound can be ensured to be reliablyThe modified super-hydrophobic layer prepared on the surface of the aluminum-copper alloy contains a large amount of intermetallic compounds, and has high wear resistance and long service life.)

1. A method for constructing a super-hydrophobic modified layer on the surface of an aluminum-copper alloy is characterized by comprising the following process steps:

step 1, polishing the surface of an aluminum-copper alloy workpiece by using abrasive paper to remove an oxide film on the surface;

washing to be clean;

step 2, immersing the aluminum-copper alloy workpiece into an etching solution prepared by NaOH, reducing sugar and water, and carrying out chemical etching treatment;

washing to be clean;

step 3, immersing the aluminum-copper alloy workpiece into an ethanol solution prepared from ethanol and low-surface-energy substances for surface modification treatment;

washing to be clean;

and drying to obtain the aluminum-copper alloy workpiece with the surface provided with the super-hydrophobic modified layer.

2. The method for constructing the superhydrophobic modification layer on the surface of the aluminum-copper alloy according to claim 1, wherein the polishing treatment in step 1 is divided into the following two process steps:

firstly, polishing the surface of an aluminum-copper alloy workpiece by using No. 800 abrasive paper;

and secondly, polishing the surface of the aluminum-copper alloy workpiece obtained in the first step by using 1200# abrasive paper.

3. The method for constructing the superhydrophobic modified layer on the surface of the aluminum-copper alloy according to claim 1, wherein the etching solution in the step 2 comprises the following raw materials in percentage by weight:

NaOH 1.0%、

3.0 percent of reducing sugar,

And (5) 96.0 percent of water.

4. The method for constructing the superhydrophobic modification layer on the surface of the aluminum-copper alloy according to claim 1 or 3, wherein the reducing sugar in the etching solution is glucose, fructose and/or maltose.

5. The method for constructing the superhydrophobic modified layer on the surface of the aluminum-copper alloy according to claim 1, wherein the chemical etching treatment in the step 2 is a soaking treatment in a room temperature environment for 80-150 min.

6. The method for constructing the superhydrophobic modified layer on the surface of the aluminum-copper alloy according to claim 1, wherein the ethanol solution in the step 3 comprises the following raw materials in percentage by weight:

95.0 to 99.0 percent of ethanol,

1.0-5.0% of low surface energy substance.

7. The method for constructing the super-hydrophobic modified layer on the surface of the aluminum-copper alloy as claimed in claim 1 or 6, wherein the low surface energy substance in the ethanol solution is stearic acid, perfluorooctyltrichlorosilane, perfluorooctyltrimethoxysilane or lauric acid.

8. The method for constructing the superhydrophobic modified layer on the surface of the aluminum-copper alloy according to claim 1, wherein the surface modification treatment in the step 3 is a soaking treatment in a room temperature environment for 220-380 min.

9. The method for constructing the superhydrophobic modification layer on the surface of the aluminum-copper alloy according to claim 1, wherein the copper content in the aluminum-copper alloy is 4.0-8.0%.

Technical Field

The invention relates to a metal material surface treatment technology, in particular to a method for constructing a super-hydrophobic modified layer on the surface of an aluminum-copper alloy workpiece.

Background

The aluminum-copper alloy has the characteristics of high mechanical property, good cutting processing property, excellent heat resistance and the like, and is widely applied to aerospace structural members, welding rod solders, mechanical processing products, engine piston wheels and the like. However, the corrosion resistance of the surface of the aluminum-copper alloy is not high, which greatly limits the industrial expansion application of the aluminum-copper alloy. In order to improve and improve the corrosion resistance of the surface of the aluminum-copper alloy, the industry generally constructs a super-hydrophobic modified layer on the surface of the aluminum-copper alloy, and the constructed super-hydrophobic modified layer can not only improve the corrosion resistance of the surface of the aluminum-copper alloy, but also improve the pollution resistance and the anti-icing performance of the surface of the aluminum-copper alloy, thereby being beneficial to expanding the industrial expansion application range of the aluminum-copper alloy.

At present, the construction of the superhydrophobic modification layer on the surface of the aluminum-copper alloy is usually realized by a technical measure combining the chemical etching of a NaOH solution and the chemical modification of stearic acid/lauric acid, and the technical measure is also one of the main technical measures for constructing the superhydrophobic modification layer on the surface of the aluminum alloy at present. However, the copper content in the aluminum-copper alloy is relatively high, and the chemical etching of the aluminum-copper alloy with the NaOH solution has the following technical problems: the copper element in the aluminum-copper alloy is easy to react with the oxygen in the NaOH solution, namely CuAl₃+O₂+NaOH+H₂O→Na₂CuO₂+Al(OH)₃. Thus, CuAl in the surface layer of the aluminum-copper alloy₃、Cu₂Al₈And intermetallic compounds are easy to be completely etched, so that the content of the intermetallic compounds in the super-hydrophobic modified layer constructed on the surface of the aluminum-copper alloy is extremely low, the hardness of the super-hydrophobic modified layer is relatively low, the wear resistance is poor, and the service life is short.

Disclosure of Invention

The technical purpose of the invention is as follows: aiming at the particularity of the aluminum-copper alloy and the defects of the prior art, the method for constructing the super-hydrophobic modified layer with good abrasion resistance and long service life on the surface of the aluminum-copper alloy is provided.

The technical purpose of the invention is realized by the following technical scheme, namely a method for constructing a super-hydrophobic modified layer on the surface of an aluminum-copper alloy, which comprises the following process steps:

step 1, polishing the surface of an aluminum-copper alloy workpiece by using abrasive paper to remove an oxide film on the surface;

washing to be clean;

step 2, immersing the aluminum-copper alloy workpiece into an etching solution prepared by NaOH, reducing sugar and water, and carrying out chemical etching treatment;

washing to be clean;

step 3, immersing the aluminum-copper alloy workpiece into an ethanol solution prepared from ethanol and low-surface-energy substances for surface modification treatment;

washing to be clean;

and drying to obtain the aluminum-copper alloy workpiece with the surface provided with the super-hydrophobic modified layer.

As one of the preferable schemes, the polishing treatment in the step 1 is divided into the following two process steps:

firstly, polishing the surface of an aluminum-copper alloy workpiece by using No. 800 abrasive paper;

and secondly, polishing the surface of the aluminum-copper alloy workpiece obtained in the first step by using 1200# abrasive paper.

As one of the preferable schemes, the etching solution in the step 2 comprises the following raw materials in percentage by weight:

NaOH 1.0%、

3.0 percent of reducing sugar,

And (5) 96.0 percent of water.

Preferably, the reducing sugar in the etching solution is glucose, fructose and/or maltose.

As one of the preferable schemes, the chemical etching treatment in the step 2 is soaking treatment for 80-150 min at room temperature.

As one of the preferable schemes, the ethanol solution in the step 3 comprises the following raw materials in percentage:

95.0 to 99.0 percent of ethanol,

1.0-5.0% of low surface energy substance.

As one of the preferable schemes, the low surface energy substance in the ethanol solution is stearic acid, perfluorooctyltrichlorosilane, perfluorooctyltrimethoxysilane or lauric acid.

Preferably, the surface modification treatment in step 3 is soaking treatment at room temperature for 220-380 min.

Preferably, the copper content in the aluminum-copper alloy is 4.0-8.0%.

The beneficial technical effects of the invention are as follows: the technical measure takes the solution prepared from NaOH, reducing sugar and water as the etching solution for the chemical etching of the aluminum-copper alloy, the cost is low, and the reducing sugar can stably maintain the reducing performance of the etching solution, so that the intermetallic compound CuAl in the aluminum-copper alloy is effectively inhibited₃、Cu₂Al₈And the super-hydrophobic modified layer prepared on the surface of the aluminum-copper alloy contains a large amount of intermetallic compounds, the hardness of the super-hydrophobic modified layer is high, the abrasion resistance is remarkably improved, the service life of the super-hydrophobic modified layer constructed on the surface of the aluminum-copper alloy can be greatly prolonged, and the industrial expansion application range of the aluminum-copper alloy is favorably expanded. Furthermore, the technical measures are realized by the intermetallic compound CuAl in the aluminum-copper alloy₃、Cu₂Al₈And the oxidation corrosion of oxygen molecules in the alkaline etching solution is effectively inhibited, so that the technical problem of recovery caused by a large amount of copper-containing compounds falling into the etching solution is effectively avoided.

Drawings

FIG. 1 is a schematic view of the surface structure of an aluminum-copper alloy workpiece after being chemically etched according to the present invention.

FIG. 2 is an SEM image of an aluminum-copper alloy workpiece after being subjected to a superhydrophobic modification treatment according to the present invention.

FIG. 3 is a surface water drop pattern of an aluminum-copper alloy workpiece obtained in example 1 of the present invention.

FIG. 4 is a graph of the static contact angle of the aluminum bronze alloy workpiece obtained in example 1 of the present invention.

Detailed Description

The invention relates to a metal material surface treatment technology, in particular to a method for constructing a super-hydrophobic modified layer on the surface of an aluminum-copper alloy workpiece, and the main technical content of the invention is explained in detail by using a plurality of embodiments.

Example 1

In this example, the present invention uses 2a12 aluminum bronze alloy as the workpiece to be machined, and the copper content in the 2a12 aluminum bronze alloy is about 4.8%.

The method for constructing the super-hydrophobic modified layer on the surface of the 2A12 aluminum-copper alloy comprises the following process steps:

step 1, polishing the surface of a workpiece by using sand paper according to the following two steps:

firstly, grinding the surface of a workpiece by using 800# abrasive paper;

step two, polishing the surface of the workpiece in the step one by using No. 1200 abrasive paper;

removing an oxide film layer on the surface of the workpiece through two times of polishing treatment;

then, washing the surface of the workpiece by deionized water;

step 2, immersing the workpiece obtained in the step 1 into an etching solution for chemical etching treatment;

the etching solution comprises the following raw materials in percentage by weight: NaOH 1.0%, glucose 3.0%, water 96.0%.

The process conditions of the chemical etching treatment are that the room temperature environment is kept (namely within the range of 25-30 ℃), and the soaking treatment is carried out for about 120 min;

taking the workpiece out of the etching solution, and washing the workpiece with deionized water (the obtained workpiece surface layer structure is shown in figure 1);

step 3, immersing the workpiece obtained in the step 2 into an ethanol solution for surface modification treatment;

the ethanol solution comprises the following raw materials in percentage by weight: 95.0 percent of ethanol and 5.0 percent of perfluoro octyl trichlorosilane.

The process conditions of the surface modification treatment are that the surface modification treatment is carried out for about 360min by maintaining the room temperature environment (namely within the range of 25-30 ℃);

taking the workpiece out of the ethanol solution, and washing the workpiece clean by adopting absolute ethyl alcohol;

and (3) putting the cleaned workpiece into a drying oven, and drying at the ambient temperature of about 80 ℃ for about 20min to obtain the aluminum-copper alloy workpiece with the surface provided with the super-hydrophobic modified layer (shown in figure 2).

Referring to fig. 3, the water drops on the surface of the aluminum-copper alloy workpiece are spherical water drops.

Referring to fig. 4, a contact angle measuring instrument is used for performing a static contact angle test on the surface of the aluminum-copper alloy workpiece with the superhydrophobic modification layer on the surface, and the static contact angle of a water drop on the superhydrophobic modification layer of the workpiece is 165 degrees, which shows that the superhydrophobic performance of the workpiece surface is excellent after the superhydrophobic modification.

The mechanical stability of the workpiece is measured by adopting a linear wear resistance experiment, firstly, a pressure of 3.0kPa is applied to a superhydrophobic surface of 2cm multiplied by 2cm, the workpiece slides on 800# abrasive paper for 100cm at a speed of 5cm/s, and a static contact angle of water drops on the superhydrophobic modified layer of the workpiece is 159 degrees, which shows that the superhydrophobic modified layer on the surface of the workpiece has better wear resistance.

The chemical stability of the workpiece is tested by adopting a 3.5% NaCl aqueous solution, the workpiece is placed in a 3.5% NaCl aqueous solution and is kept still for 7 days, and the static contact angle of water drops on the super-hydrophobic modification layer of the workpiece is 157 degrees, which shows that the super-hydrophobic modification layer on the surface of the workpiece has excellent chemical stability.

Example 2

In this example, the present invention uses 2a12 aluminum bronze alloy as the workpiece to be machined, and the copper content in the 2a12 aluminum bronze alloy is about 4.8%.

The method for constructing the super-hydrophobic modified layer on the surface of the 2A12 aluminum-copper alloy comprises the following process steps:

step 1, polishing the surface of a workpiece by using sand paper according to the following two steps:

firstly, grinding the surface of a workpiece by using 800# abrasive paper;

step two, polishing the surface of the workpiece in the step one by using No. 1200 abrasive paper;

removing an oxide film layer on the surface of the workpiece through two times of polishing treatment;

then, washing the surface of the workpiece by deionized water;

step 2, immersing the workpiece obtained in the step 1 into an etching solution for chemical etching treatment;

the etching solution comprises the following raw materials in percentage by weight: NaOH 1.0%, glucose 2.0%, maltose 1.0%, and water 96.0%.

The process conditions of the chemical etching treatment are that the room temperature environment is kept (namely within the range of 25-30 ℃), and the soaking treatment is carried out for about 180 min;

taking the workpiece out of the etching solution, and washing the workpiece with deionized water;

step 3, immersing the workpiece obtained in the step 2 into an ethanol solution for surface modification treatment;

the ethanol solution comprises the following raw materials in percentage by weight: 98.0 percent of ethanol and 2.0 percent of stearic acid.

The process conditions of the surface modification treatment are that the surface modification treatment is carried out for about 360min by maintaining the room temperature environment (namely within the range of 25-30 ℃);

taking the workpiece out of the ethanol solution, and washing the workpiece clean by adopting absolute ethyl alcohol;

and (3) putting the cleaned workpiece into a drying box, and drying at the ambient temperature of about 80 ℃ for about 20min to obtain the aluminum-copper alloy workpiece with the surface provided with the super-hydrophobic modified layer.

And (3) performing static contact angle test on the surface of the aluminum-copper alloy workpiece with the super-hydrophobic modification layer built on the surface by using a contact angle measuring instrument, wherein the static contact angle of water drops on the super-hydrophobic modification layer of the workpiece is 165 degrees, which shows that the super-hydrophobic property of the surface of the workpiece is excellent after the super-hydrophobic modification.

The mechanical stability of the workpiece is measured by adopting a linear wear-resistant experiment, firstly, a pressure of 3.0kPa is applied to a superhydrophobic surface of 2cm multiplied by 2cm, the workpiece slides on 800# abrasive paper for 100cm at a speed of 5cm/s, and a static contact angle of water drops on the superhydrophobic modified layer of the workpiece is 161 degrees, which shows that the superhydrophobic modified layer of the workpiece surface has better wear resistance.

The chemical stability of the workpiece is tested by adopting a 3.5% NaCl aqueous solution, the workpiece is placed in a 3.5% NaCl aqueous solution and is kept still for 7 days, and the static contact angle of water drops on the super-hydrophobic modification layer of the workpiece is 159 degrees, which shows that the super-hydrophobic modification layer on the surface of the workpiece has excellent chemical stability.

Example 3

In this example, the workpiece of the present invention is a ZL203 aluminum bronze alloy, and the copper content of the ZL203 aluminum bronze alloy is about 4.9%.

The method for constructing the super-hydrophobic modified layer on the surface of ZL203 aluminum-copper alloy comprises the following process steps:

step 1, polishing the surface of a workpiece by using sand paper according to the following two steps:

firstly, grinding the surface of a workpiece by using 800# abrasive paper;

step two, polishing the surface of the workpiece in the step one by using No. 1200 abrasive paper;

removing an oxide film layer on the surface of the workpiece through two times of polishing treatment;

then, washing the surface of the workpiece by deionized water;

step 2, immersing the workpiece obtained in the step 1 into an etching solution for chemical etching treatment;

the etching solution comprises the following raw materials in percentage by weight: NaOH 1.0%, maltose 3.0%, water 96.0%.

The process conditions of the chemical etching treatment are that the room temperature environment is kept (namely within the range of 25-30 ℃), and the soaking treatment is carried out for about 120 min;

taking the workpiece out of the etching solution, and washing the workpiece with deionized water;

step 3, immersing the workpiece obtained in the step 2 into an ethanol solution for surface modification treatment;

the ethanol solution comprises the following raw materials in percentage by weight: 99.0% of ethanol and 1.0% of lauric acid.

The process conditions of the surface modification treatment are that the surface modification treatment is carried out for about 360min by maintaining the room temperature environment (namely within the range of 25-30 ℃);

taking the workpiece out of the ethanol solution, and washing the workpiece clean by adopting absolute ethyl alcohol;

and (3) putting the cleaned workpiece into a drying box, and drying at the ambient temperature of about 80 ℃ for about 20min to obtain the aluminum-copper alloy workpiece with the surface provided with the super-hydrophobic modified layer.

And (3) performing static contact angle test on the surface of the aluminum-copper alloy workpiece with the super-hydrophobic modification layer built on the surface by using a contact angle measuring instrument, wherein the static contact angle of water drops on the super-hydrophobic modification layer of the workpiece is 161 degrees, which shows that the super-hydrophobic property of the surface of the workpiece is excellent after the super-hydrophobic modification.

The mechanical stability of the workpiece is measured by adopting a linear wear resistance experiment, firstly, a pressure of 3.0kPa is applied to a superhydrophobic surface of 2cm multiplied by 2cm, the workpiece slides on 800# abrasive paper for 100cm at a speed of 5cm/s, and a static contact angle of water drops on the superhydrophobic modified layer of the workpiece is 157 degrees, which shows that the superhydrophobic modified layer on the surface of the workpiece has better wear resistance.

The chemical stability of the workpiece is tested by adopting a 3.5% NaCl aqueous solution, the workpiece is placed in a 3.5% NaCl aqueous solution and is kept still for 7 days, and the static contact angle of water drops on the super-hydrophobic modification layer of the workpiece is 156 degrees, which shows that the super-hydrophobic modification layer on the surface of the workpiece has excellent chemical stability.

Example 4

In this example, the workpiece of the present invention is a ZL203 aluminum bronze alloy, and the copper content of the ZL203 aluminum bronze alloy is about 4.9%.

The method for constructing the super-hydrophobic modified layer on the surface of ZL203 aluminum-copper alloy comprises the following process steps:

step 1, polishing the surface of a workpiece by using sand paper according to the following two steps:

firstly, grinding the surface of a workpiece by using 800# abrasive paper;

step two, polishing the surface of the workpiece in the step one by using No. 1200 abrasive paper;

removing an oxide film layer on the surface of the workpiece through two times of polishing treatment;

then, washing the surface of the workpiece by deionized water;

step 2, immersing the workpiece obtained in the step 1 into an etching solution for chemical etching treatment;

the etching solution comprises the following raw materials in percentage by weight: NaOH 1.0%, fructose 3.0%, water 96.0%.

The process conditions of the chemical etching treatment are that the room temperature environment is kept (namely within the range of 25-30 ℃), and the soaking treatment is carried out for about 120 min;

taking the workpiece out of the etching solution, and washing the workpiece with deionized water;

step 3, immersing the workpiece obtained in the step 2 into an ethanol solution for surface modification treatment;

the ethanol solution comprises the following raw materials in percentage by weight: 97.0 percent of ethanol and 3.0 percent of perfluoro octyl trimethoxy silane.

The process conditions of the surface modification treatment are that the surface modification treatment is carried out for about 360min by maintaining the room temperature environment (namely within the range of 25-30 ℃);

taking the workpiece out of the ethanol solution, and washing the workpiece clean by adopting absolute ethyl alcohol;

and (3) putting the cleaned workpiece into a drying box, and drying at the ambient temperature of about 80 ℃ for about 20min to obtain the aluminum-copper alloy workpiece with the surface provided with the super-hydrophobic modified layer.

And (3) performing static contact angle test on the surface of the aluminum-copper alloy workpiece with the super-hydrophobic modification layer built on the surface by using a contact angle measuring instrument, wherein the static contact angle of water drops on the super-hydrophobic modification layer of the workpiece is 163 degrees, which shows that the super-hydrophobic property of the surface of the workpiece is excellent after the super-hydrophobic modification.

The mechanical stability of the workpiece is measured by adopting a linear wear-resistant experiment, firstly, a pressure of 3.0kPa is applied to a superhydrophobic surface of 2cm multiplied by 2cm, the workpiece slides on 800# abrasive paper for 100cm at a speed of 5cm/s, and a static contact angle of water drops on the superhydrophobic modified layer of the workpiece is 158 degrees, which shows that the superhydrophobic modified layer of the workpiece surface has better wear resistance.

The chemical stability of the workpiece is tested by adopting a 3.5% NaCl aqueous solution, the workpiece is placed in a 3.5% NaCl aqueous solution and is kept still for 7 days, and the static contact angle of water drops on the super-hydrophobic modification layer of the workpiece is 159 degrees, which shows that the super-hydrophobic modification layer on the surface of the workpiece has excellent chemical stability.

Comparative example

Firstly, sequentially polishing 2A12 aluminum-copper alloy samples by using 800# and 1200# sandpaper; washing the product with deionized water;

subsequently, the sample was placed in a NaOH solution, the concentration of NaOH in the solution being about 1.0%; soaking and etching the substrate for about 120min at room temperature (i.e. within the range of 25-30 ℃);

then, the sample is placed in a hydrochloric acid solution with the mass percentage concentration of about 4.0% for soaking treatment for 10s, and the brown Na remained on the surface of the sample is removed₂CuO₂Dissolving;

washing with deionized water;

directly placing the mixture into an ethanol solution containing perfluorooctyl trichlorosilane, and soaking the mixture for about 300min at room temperature (namely within the range of 25-30 ℃), wherein the mass percent concentration of the perfluorooctyl trichlorosilane in the ethanol solution is about 5.0%;

taking out and cleaning with absolute ethyl alcohol;

and finally, drying in a drying oven at the temperature of about 80 ℃ for about 20min to obtain the super-hydrophobic modified layer on the surface of the sample.

And a contact angle measuring instrument is adopted to test the static contact angle of the surface of the sample, the static contact angle of water drops on the super-hydrophobic modification layer of the sample is 162 degrees, and the super-hydrophobic property of the surface of the aluminum-copper alloy sample is excellent after the super-hydrophobic modification.

The mechanical stability of the sample is measured by a linear abrasion resistance test, firstly, a pressure of 3.0kPa is applied to the surface of a 2cm multiplied by 2cm super-hydrophobic sample, the sample slides on 800# sandpaper for 100cm at a speed of 5cm/s, and the static contact angle of a water drop on the super-hydrophobic modified layer of the sample is 144 degrees, which shows that the abrasion resistance of the super-hydrophobic modified layer on the surface of the sample is poor.

The chemical stability of the sample is tested by adopting a 3.5% NaCl aqueous solution, the sample is placed in a 3.5% NaCl aqueous solution and is kept still for 7 days, the static contact angle of water drops on the super-hydrophobic modified layer of the sample is 146 degrees, and the chemical stability of the super-hydrophobic modified layer on the surface of the sample is poor.

The above examples are intended to illustrate the invention, but not to limit it. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications may be made to the above-described embodiments or equivalents may be substituted for some of the features thereof; and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essence.