CN111690968A

CN111690968A - Preparation method of super-hydrophobic aluminum alloy

Info

Publication number: CN111690968A
Application number: CN201910180133.4A
Authority: CN
Inventors: 陈宇
Original assignee: Binzhou University
Current assignee: Binzhou University
Priority date: 2019-03-11
Filing date: 2019-03-11
Publication date: 2020-09-22

Abstract

The invention belongs to the technical field of functional materials, and relates to a preparation method of a super-hydrophobic aluminum alloy. The invention provides a preparation method of a super-hydrophobic aluminum alloy, and particularly relates to a super-hydrophobic structure prepared by an electrodeposition method. Has the following advantages: on one hand, etching of the aluminum alloy in an acid medium is utilized; on the other hand, a stable adsorption film is formed on the surface of the aluminum alloy by utilizing the carbamido linseed oil imidazoline quaternary ammonium salt to construct a super-hydrophobic surface, so that the super-hydrophobic aluminum alloy has excellent corrosion resistance. The preparation process is simple, the reproducibility is good, expensive equipment and complex chemical treatment process are not needed, and the method has wide industrial application prospect.

Description

Preparation method of super-hydrophobic aluminum alloy

Technical Field

The invention belongs to the technical field of functional materials, and particularly relates to a preparation method of a super-hydrophobic aluminum alloy.

Background

The aluminum alloy has the advantages of small specific gravity, high strength, good physical and chemical properties and cutting performance, stable size, low price, recyclability and the like, and has wide application prospect in the fields of automobiles, electronics, machinery, aviation, aerospace and the like. However, the aluminum alloy has negative electrode potential and active chemical property, and is very easy to corrode in humid atmosphere or neutral salt water solution, so that effective inhibition of corrosion of the aluminum alloy is very necessary for expanding the application of the aluminum alloy.

In recent years, inspired by the "lotus effect", a superhydrophobic surface with a contact angle with a water drop of more than 150 ° has difficulty in permeating water molecules and corrosive ions into the inside of the superhydrophobic surface due to the strong hydrophobic characteristic of the superhydrophobic surface. Therefore, the super-hydrophobic corrosion inhibition film is constructed on the metal substrate, and the corrosion resistance of the super-hydrophobic corrosion inhibition film can be obviously improved.

At present, stearic acid is commonly used for constructing a super-hydrophobic structure on a metal surface, but the super-hydrophobic structure has short service life and is easy to damage after being soaked in a corrosive medium for a long time. The preparation method of the super-hydrophobic surface reported at present either needs harsh equipment or has too long preparation time. Therefore, the preparation method of the simple, high-efficiency and long-life super-hydrophobic aluminum alloy has important economic significance and social significance.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a method for preparing a quick and long-life super-hydrophobic aluminum alloy, and the super-hydrophobic structure constructed by the method is stable and is particularly suitable for protecting the aluminum alloy in a 3.5% NaCl solution corrosive medium.

(1) Aluminum alloy pretreatment:

the aluminum alloy is firstly respectively polished by 60-mesh, 120-mesh, 320-mesh and 600-mesh sand paper to remove impurities and oxides on the surface, then ultrasonically cleaned by absolute ethyl alcohol and acetone for 10 minutes to remove organic matters, and finally N is added₂Drying for later use;

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, carbamido linseed oil imidazoline quaternary ammonium salt and isopropanol, and the mass fractions are respectively as follows: linolenic acid 5-10 wt%, carbamido linseed oil imidazoline quaternary ammonium salt 20-40 wt%, and isopropanol 50-75 wt%, with the total amount of 100 wt%. The preparation method of the super-hydrophobic aluminum alloy provided by the invention has the advantages that the constant potential is 2-5V, the electrodeposition time is 4-12h, and the temperature is 30-50 ℃. On one hand, the invention utilizes the etching of the aluminum alloy in an acid medium; on the other hand, the carbamido linseed oil imidazoline quaternary ammonium salt is used for forming a stable adsorption film on the aluminum alloy to construct a super-hydrophobic surface, so that the super-hydrophobic aluminum alloy has excellent corrosion resistance. The preparation process is simple, the reproducibility is good, expensive equipment and complex chemical treatment process are not needed, and the method has wide industrial application prospect.

The invention has the beneficial effects that:

1. the invention provides a preparation method of a super-hydrophobic aluminum alloy, which can obviously improve the corrosion resistance of the super-hydrophobic aluminum alloy in a 3.5% NaCl solution corrosion medium;

2. the invention provides a preparation method of a super-hydrophobic aluminum alloy, wherein linolenic acid is adopted as an electrolyte, and the obtained film layer has better super-hydrophobic performance;

3. the invention provides a preparation method of a super-hydrophobic aluminum alloy, which has lower applied voltage and can effectively reduce energy consumption;

4. the invention provides a preparation method of a super-hydrophobic aluminum alloy, which has short electro-deposition time and can construct a super-hydrophobic surface only in 6 hours under the voltage of 2V;

5. the invention provides a preparation method of super-hydrophobic aluminum alloy, the super-hydrophobic film has longer service life;

6. the invention provides a preparation method of a super-hydrophobic aluminum alloy, which not only has a super-hydrophobic structure, but also forms a stable adsorption film on the surface;

7. the invention provides a preparation method of a super-hydrophobic aluminum alloy, which has excellent protection effect on the aluminum alloy in a 3.5% NaCl solution corrosive medium;

8. the invention provides a preparation method of a super-hydrophobic aluminum alloy, wherein the preparation method is simple, the energy consumption is low, and the electrolyte formula is non-toxic and pollution-free and can be applied to large-scale industrial application.

Drawings

FIG. 1: contact angle of untreated aluminum alloy;

FIG. 2: contact angle of super-hydrophobic aluminum alloy;

FIG. 3: the electrochemical impedance test result of the untreated aluminum alloy in a 3.5% NaCl solution corrosion medium;

FIG. 4: the electrochemical impedance test result of the super-hydrophobic aluminum alloy in a 3.5% NaCl solution corrosion medium;

FIG. 5: the polarization curve test result of the untreated aluminum alloy in a 3.5% NaCl solution corrosion medium;

FIG. 6: and (3) curve test results of the super-hydrophobic aluminum alloy in a 3.5% NaCl solution corrosion medium.

Detailed Description

The invention is further described below with reference to the figures and examples. While the invention will be described in conjunction with the preferred embodiments, it will be understood that they are not intended to limit the invention to the embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the scope of the invention as defined by the appended claims.

Example 1:

the invention provides a preparation method of a super-hydrophobic aluminum alloy, which comprises the following steps:

(1) aluminum alloy pretreatment:

firstly, grinding the aluminum alloy by 60-mesh, 120-mesh, 320-mesh and 600-mesh sand paper respectively to remove impurities and oxides on the surface, then ultrasonically cleaning the aluminum alloy for 10 minutes by using absolute ethyl alcohol and acetone to remove organic matters, and then drying the aluminum alloy for later use by N2;

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, carbamido linseed oil imidazoline quaternary ammonium salt and isopropanol, and the mass fractions are respectively as follows: linolenic acid 5%, carbamido linseed oil imidazoline quaternary ammonium salt 20% and isopropanol 75%. The preparation method of the super-hydrophobic aluminum alloy provided by the invention has the advantages that the constant potential is 2V, the electrodeposition time is 12h, and the temperature is 50 ℃.

The contact angle of the prepared super-hydrophobic aluminum alloy is measured by a contact angle tester, and compared with the aluminum alloy which is not subjected to super-hydrophobic treatment, the result is shown in figures 1 and 2, and the contact angle of the aluminum alloy treated by the method is higher than 150 degrees.

Example 2:

(1) aluminum alloy pretreatment:

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, carbamido linseed oil imidazoline quaternary ammonium salt and isopropanol, and the mass fractions are respectively as follows: linolenic acid 10%, carbamido linseed oil imidazoline quaternary ammonium salt 40% and isopropanol 50%. The preparation method of the super-hydrophobic aluminum alloy provided by the invention has the advantages that the constant potential is 5V, the electrodeposition time is 4 h, and the temperature is 40 ℃.

The super-hydrophobic aluminum alloy is subjected to electrochemical impedance test in a 3.5% NaCl solution corrosion medium, and compared with the aluminum alloy which is not subjected to super-hydrophobic treatment, the results are shown in fig. 3, fig. 4 and table 1, after the super-hydrophobic aluminum alloy is treated by the method, the charge transfer resistance is obviously increased, and the prepared super-hydrophobic aluminum alloy has better corrosion resistance.

TABLE 1

Example 3:

(1) aluminum alloy pretreatment:

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, carbamido linseed oil imidazoline quaternary ammonium salt and isopropanol, and the mass fractions are respectively as follows: linolenic acid 10%, carbamido linseed oil imidazoline quaternary ammonium salt 30% and isopropanol 60%. The preparation method of the super-hydrophobic aluminum alloy provided by the invention has the advantages that the constant potential is 4V, the electrodeposition time is 8 h, and the temperature is 30 ℃.

The polarization curve test of the super-hydrophobic aluminum alloy is carried out in a 3.5% NaCl solution corrosion medium, and compared with the aluminum alloy which is not subjected to super-hydrophobic treatment, the results are shown in fig. 5, fig. 6 and table 2, and the self-corrosion current is obviously reduced after the treatment by the method, which indicates that the prepared super-hydrophobic aluminum alloy has better corrosion resistance.

TABLE 2

Condition	j, mA/cm²
		Without super-hydrophobic treatment	0.92
Super-hydrophobic	0.026

Claims

1. The preparation method of the super-hydrophobic aluminum alloy is characterized by comprising the following steps:

(1) aluminum alloy pretreatment:

(2) preparing a super-hydrophobic structure by electrodeposition:

the electrolyte formula consists of linolenic acid, carbamido linseed oil imidazoline quaternary ammonium salt and isopropanol, and the mass fractions are respectively as follows: linolenic acid 5-10 wt%, carbamido linseed oil imidazoline quaternary ammonium salt 20-40 wt%, and isopropanol 50-75 wt%, with the total amount of 100 wt%.

2. The preparation method of the super-hydrophobic aluminum alloy provided by the invention has the advantages that the constant potential is 2-5V, the electro-deposition time is 4-12h, and the temperature is 30-50 ℃, so that the super-hydrophobic aluminum alloy can be obtained, and the super-hydrophobic aluminum alloy has excellent corrosion resistance in a 3.5% NaCl solution corrosion medium.

3. The method for preparing the super-hydrophobic aluminum alloy as recited in claim 1, wherein: the electrolyte formula consists of linolenic acid, carbamido linseed oil imidazoline quaternary ammonium salt and isopropanol.

4. The method for preparing the super-hydrophobic aluminum alloy as recited in claim 1, wherein: the aluminum alloy is firstly respectively polished by 60-mesh, 120-mesh, 320-mesh and 600-mesh sandpaper to remove impurities and oxides on the surface.

5. The method for preparing the super-hydrophobic aluminum alloy as recited in claim 1, wherein: deoiled aluminum alloy treated with N₂And drying for later use.

6. The method for preparing the super-hydrophobic aluminum alloy as recited in claim 1, wherein: the constant potential is 2-5V.

7. The method for preparing the super-hydrophobic aluminum alloy as recited in claim 1, wherein: the electrodeposition time is 4-12 h.

8. The method for preparing the super-hydrophobic aluminum alloy as recited in claim 1, wherein: the electrodeposition temperature is 30-50 ℃.