CN111763975A - Preparation method of graphene-based super-hydrophobic magnesium alloy - Google Patents
Preparation method of graphene-based super-hydrophobic magnesium alloy Download PDFInfo
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- CN111763975A CN111763975A CN201910257331.6A CN201910257331A CN111763975A CN 111763975 A CN111763975 A CN 111763975A CN 201910257331 A CN201910257331 A CN 201910257331A CN 111763975 A CN111763975 A CN 111763975A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
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Abstract
The invention belongs to the technical field of functional materials, and relates to a preparation method of a graphene-based super-hydrophobic magnesium alloy. The invention provides a preparation method of a graphene-based super-hydrophobic magnesium alloy, and particularly relates to a preparation method of a super-hydrophobic structure by adopting an electrodeposition method. Has the following advantages: on one hand, the magnesium alloy is etched in a linolenic acid medium to construct a rough structure on the surface of the magnesium alloy, on the other hand, the lamellar blocking function of graphene is fully exerted, the corrosion inhibition efficiency reaches more than 97 percent, and the corrosion inhibition method has wide industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of functional materials, and particularly relates to a preparation method of a graphene-based super-hydrophobic magnesium alloy.
Background
The magnesium alloy has the advantages of small relative density, high specific strength, good processing, welding and damping properties, 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 electrode potential of the magnesium alloy is very negative, the chemical property is active, and the magnesium alloy is very easy to corrode in humid atmosphere or neutral saline solution, so that the effective inhibition of the corrosion of the magnesium alloy is very necessary for the development of the application of the magnesium alloy.
In recent years, inspired by the lotus effect, the super-hydrophobic surface with a contact angle of more than 150 degrees with a water drop has the strong hydrophobic characteristic that water molecules and corrosive ions are difficult to permeate into the super-hydrophobic surface, so that the corrosion resistance of the metal material is obviously improved.
At present, a super-hydrophobic structure is constructed on the surface of a metal material by the etching action of stearic acid on the metal material, 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 magnesium 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 magnesium alloy, and the super-hydrophobic structure constructed by the method is stable and is particularly suitable for protecting the magnesium alloy in an HCl corrosion medium with the mass fraction of 10%.
The invention provides a preparation method of a graphene-based super-hydrophobic magnesium alloy, which comprises the following steps:
(1) magnesium alloy pretreatment:
the magnesium alloy is firstly respectively polished by 60-mesh, 120-mesh, 320-mesh, 600-mesh and 1200-mesh sandpaper to remove impurities and oxides on the surface, then ultrasonically cleaned by isopropanol 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 graphene oxide, linolenic acid and isopropanol, and the mass fractions of the graphene oxide, the linolenic acid and the isopropanol are respectively as follows: 20-40% of graphene oxide, 10-20% of linolenic acid and 40-70% of isopropanol, wherein the sum of the percentage contents of the components is 100%. The preparation method of the super-hydrophobic magnesium alloy provided by the invention has the advantages that the constant potential is 2-5V, the electrodeposition time is 4-12 h, and the temperature is 30-50 ℃. On one hand, the invention utilizes linolenic acid to etch the magnesium alloy; on the other hand, a film layer with high blocking performance is formed by utilizing the strong adsorption force of the graphene oxide on the surface of the magnesium alloy, so that a super-hydrophobic surface is constructed, and the super-hydrophobic magnesium alloy has excellent corrosion resistance. The preparation process is simple, the reproducibility is good, expensive equipment is 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 graphene-based super-hydrophobic magnesium alloy, which can obviously improve the corrosion resistance of the graphene-based super-hydrophobic magnesium alloy in an HCl corrosion medium with the mass fraction of 10%;
2. the invention provides a preparation method of a graphene-based super-hydrophobic magnesium alloy, wherein linolenic acid and graphene oxide are adopted as electrolyte, and the obtained film layer has better super-hydrophobic property;
3. the invention provides a preparation method of graphene-based super-hydrophobic magnesium alloy, which has lower applied voltage and can effectively reduce energy consumption;
4. the invention provides a preparation method of a graphene-based super-hydrophobic magnesium alloy, which is short in electrodeposition time, and can construct a super-hydrophobic surface only in 6 hours at a voltage of 2V;
5. the invention provides a preparation method of graphene-based super-hydrophobic magnesium alloy, and the super-hydrophobic film has longer service life;
6. the invention provides a preparation method of a graphene-based super-hydrophobic magnesium alloy, which not only has a super-hydrophobic structure, but also has excellent corrosion resistance, and has an excellent protection effect on the magnesium alloy in an HCl corrosion medium with the mass fraction of 10%;
7. the invention provides a preparation method of a graphene-based super-hydrophobic magnesium 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 magnesium alloy;
FIG. 2: a contact angle of the graphene-based super-hydrophobic magnesium alloy;
FIG. 3: the electrochemical impedance test result of the untreated magnesium alloy in a 3.5% NaCl solution corrosion medium;
FIG. 4: electrochemical impedance results of the graphene-based super-hydrophobic magnesium 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 graphene-based super-hydrophobic magnesium alloy, which comprises the following steps:
(1) magnesium alloy pretreatment:
the magnesium alloy is firstly respectively polished by 60-mesh, 120-mesh, 320-mesh, 600-mesh and 1200-mesh sandpaper to remove impurities and oxides on the surface, then ultrasonically cleaned by isopropanol 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 graphene oxide, linolenic acid and isopropanol, and the mass fractions of the graphene oxide, the linolenic acid and the isopropanol are respectively as follows: 20% of graphene oxide, 10% of linolenic acid and 70% of isopropanol. The preparation method of the super-hydrophobic magnesium alloy provided by the invention has the advantages that the constant potential is 5V, the electrodeposition time is 4 h, and the temperature is 30 ℃.
The contact angle of the prepared graphene-based super-hydrophobic magnesium alloy is measured by a contact angle tester, and compared with the magnesium alloy which is not subjected to super-hydrophobic treatment, the contact angle of the magnesium alloy treated by the method is higher than 150 degrees, and the results are shown in figures 1 and 2.
Example 2:
the invention provides a preparation method of a graphene-based super-hydrophobic magnesium alloy, which comprises the following steps:
(1) magnesium alloy pretreatment:
the magnesium alloy is firstly respectively polished by 60-mesh, 120-mesh, 320-mesh, 600-mesh and 1200-mesh sandpaper to remove impurities and oxides on the surface, then ultrasonically cleaned by isopropanol 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 graphene oxide, linolenic acid and isopropanol, and the mass fractions of the graphene oxide, the linolenic acid and the isopropanol are respectively as follows: 40% of graphene oxide, 20% of linolenic acid and 40% of isopropanol. The preparation method of the super-hydrophobic magnesium alloy provided by the invention has the advantages that the constant potential is 2V, the electrodeposition time is 12 h, and the temperature is 30 ℃.
Electrochemical impedance test is carried out on the graphene-based super-hydrophobic magnesium alloy in HCl corrosion medium with the mass fraction of 10%, compared with magnesium alloy which is not subjected to super-hydrophobic treatment, the results are shown in fig. 3, fig. 4 and table 2, after the graphene-based super-hydrophobic magnesium alloy is treated by the method, the charge transfer resistance is obviously increased, and the prepared graphene-based super-hydrophobic magnesium alloy has better corrosion resistance.
TABLE 2
| Condition | Rct, Ω.cm2 | Corrosion inhibition efficiency% |
| Without super-hydrophobic treatment | 12.6 | |
| Super-hydrophobic | 486 | 97.4% |
Claims (8)
1. The preparation method of the graphene-based super-hydrophobic magnesium alloy is characterized by comprising the following two steps of:
(1) magnesium alloy pretreatment:
the magnesium alloy is firstly respectively polished by 60-mesh, 120-mesh, 320-mesh, 600-mesh and 1200-mesh sandpaper to remove impurities and oxides on the surface, then ultrasonically cleaned by isopropanol 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 graphene oxide, linolenic acid and isopropanol, and the mass fractions of the graphene oxide, the linolenic acid and the isopropanol are respectively as follows: 20-40% of graphene oxide, 10-20% of linolenic acid and 40-70% of isopropanol, wherein the sum of the percentage contents of the components is 100%.
2. The preparation method of the graphene-based super-hydrophobic magnesium alloy provided by the invention has the advantages that the constant potential is 2-5V, the electrodeposition time is 4-12 h, and the temperature is 30-50 ℃, so that the graphene super-hydrophobic magnesium alloy can be obtained, and the super-hydrophobic magnesium alloy has excellent corrosion resistance in an HCl corrosion medium with the mass fraction of 10%.
3. The method for preparing the graphene-based super-hydrophobic magnesium alloy according to claim 1, wherein the electrolyte formula consists of graphene oxide, linolenic acid and isopropanol.
4. The method for preparing the graphene-based super-hydrophobic magnesium alloy according to claim 1, wherein the magnesium alloy is firstly sanded by 60-mesh, 120-mesh, 320-mesh, 600-mesh and 1200-mesh sandpaper to remove impurities and oxides on the surface.
5. The method for preparing the graphene-based super-hydrophobic magnesium alloy according to claim 1, wherein the magnesium alloy after oil removal is subjected to N2And drying for later use.
6. The preparation method of the graphene-based super-hydrophobic magnesium alloy according to claim 1, wherein the constant potential is 2-5V.
7. The preparation method of the graphene-based super-hydrophobic magnesium alloy according to claim 1, wherein the electrodeposition time is 4-12 hours.
8. The preparation method of the graphene-based super-hydrophobic magnesium alloy according to claim 1, wherein the electrodeposition temperature is 30-50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910257331.6A CN111763975A (en) | 2019-04-01 | 2019-04-01 | Preparation method of graphene-based super-hydrophobic magnesium alloy |
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| CN201910257331.6A CN111763975A (en) | 2019-04-01 | 2019-04-01 | Preparation method of graphene-based super-hydrophobic magnesium alloy |
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| CN111763975A true CN111763975A (en) | 2020-10-13 |
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