CN114892152A - Method for preparing ionic liquid conversion film on surface of magnesium alloy - Google Patents
Method for preparing ionic liquid conversion film on surface of magnesium alloy Download PDFInfo
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- CN114892152A CN114892152A CN202210558278.5A CN202210558278A CN114892152A CN 114892152 A CN114892152 A CN 114892152A CN 202210558278 A CN202210558278 A CN 202210558278A CN 114892152 A CN114892152 A CN 114892152A
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- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
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Abstract
The invention provides a method for preparing an ionic liquid conversion film on the surface of magnesium alloy, and relates to the technical field of surface coating preparation. The preparation method comprises the following steps: soaking the magnesium alloy in a mixed solution containing tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol; the mass fraction of the tetramethylguanidine phosphate ionic liquid in the mixed solution is 10-30%; and carrying out heat treatment on the immersed magnesium alloy to obtain the ionic liquid conversion film on the surface of the magnesium alloy. The ionic liquid conversion film prepared by the invention is non-toxic and environment-friendly, and can be used for treating large magnesium alloy devices with complex shapes. Meanwhile, the method is simple to operate, uses conventional instruments, has no potential safety hazard, has a short experimental period, and is suitable for mass production and application.
Description
Technical Field
The invention relates to the technical field of surface coating preparation, in particular to a method for preparing an ionic liquid conversion film on the surface of magnesium alloy.
Background
Magnesium and its alloys are widely used in the aerospace field and in the automotive industry due to their high strength and low density characteristics. However, magnesium alloys have high corrosion sensitivity, and thus they are widely limited in engineering applications. Corrosion of magnesium alloys is generally classified into: galvanic corrosion, intergranular corrosion, stress corrosion cracking, corrosion fatigue, and the like.
Corrosion protection of magnesium alloys can be achieved by various coating techniques, such as chemical conversion coatings, galvanic or electroless metal plating, anodic oxidation coatings, vapor deposition coatings, organic and inorganic coatings, and hydride coatings. Conventional chemical conversion coatings are based on hexavalent chromium compounds, but are gradually being phased out by people because they are not environmentally friendly. In the prior art, chromate-free conversion coatings using stannates, earth elements (aluminum, zirconium, niobium), zinc phosphates or potassium permanganate salts are currently under early development, but they all delay the corrosion of magnesium alloys to varying degrees, especially phosphates are of great interest due to their low environmental risk and the good performance of the resulting magnesium alloy chemical conversion coatings.
At present, few domestic reports on ionic liquid conversion coatings on the surface of magnesium alloy exist. Hou et al extract tannic acid and phytic acid from natural plants as main film forming agents to prepare a tannic acid conversion film and a phytic acid conversion film on the surface of magnesium alloy. The two magnesium alloy-based conversion coatings prepared by the method both have certain-grade cytotoxicity, belong to environment-friendly coatings, cannot process devices with complex shapes, and have certain limitations (Houyun, preparation of AZ60 magnesium alloy surface conversion coatings and biological performance research [ D ], Jilin university, 2015).
Mao et al prepared a layer of uniform nano-sized MgF on the surface of Mg-Nd-Zn-Zr alloy 2 The coating improves the corrosion resistance and biocompatibility of the magnesium alloy matrix by about 20 percent, and is beneficial to the adhesion, proliferation and intercellular arrangement of endothelial cellsAnd (3) direction. The magnesium alloy surface conversion coating prepared by the method is suitable for the medical field, and can not be used for treating large-scale devices (Malin, Kwak Minsuk, Chenjiahui, Shenli, Fan Rong, Yuan Guanyin and potassium fluoride chemical conversion coating to improve the corrosion resistance and biocompatibility of the magnesium alloy vascular stent [ J]The Chinese medicine guide 2015, 17(S1): 1-8).
Jiang et al evaluated the biocompatibility of the magnesium alloy-based fluorine conversion coating and the beta-tricalcium phosphate coating by using induced human mesenchymal cells as detection cells, and the results show that: although the biocompatibility of the two conversion coatings is superior to that of an untreated magnesium alloy material, the two conversion coatings both have certain levels of cytotoxicity and certain limitations (Jianhai, Yan cong, Zhang, Aihongjun, and the compatibility of the fluorine conversion coating magnesium alloy material and induced human mesenchymal stem cells [ J ], Chinese tissue engineering research, 2012, 16(03): 459-.
In view of the foregoing, there is a need for a chemical conversion coating that can enable a magnesium alloy substrate to undergo a series of chemical reactions with an ionic liquid, thereby forming a corrosion-resistant chemical conversion coating with a certain bonding force with the substrate.
Disclosure of Invention
The invention aims to provide a method for preparing an ionic liquid conversion film on the surface of a magnesium alloy.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for preparing an ionic liquid conversion film on the surface of magnesium alloy, which comprises the following steps:
soaking the magnesium alloy in a mixed solution containing tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol; the mass fraction of the tetramethylguanidine phosphate ionic liquid in the mixed solution is 10-30%;
and carrying out heat treatment on the immersed magnesium alloy to obtain the ionic liquid conversion film on the surface of the magnesium alloy.
Preferably, the magnesium alloy is a Mg-Al-Si based alloy.
Preferably, the magnesium alloy further comprises a pretreatment before impregnation; the pretreatment comprises sand paper grinding and ultrasonic cleaning which are sequentially carried out.
Preferably, SiC sandpaper of 800 meshes, 1500 meshes and 2000 meshes is adopted in sequence for sanding the magnesium alloy.
Preferably, the ultrasonic cleaning comprises cleaning mixed liquid ultrasonic cleaning and water ultrasonic cleaning which are sequentially carried out; the cleaning mixed liquid is a mixed liquid of absolute ethyl alcohol and acetone.
Preferably, the preparation method of the tetramethylguanidine phosphate ionic liquid comprises the following steps: mixing diisooctyl phosphate, tetramethylguanidine and an organic solvent, and carrying out ion exchange reaction to obtain the tetramethylguanidine phosphate ionic liquid.
Preferably, the dipping temperature is 20-35 ℃; the dipping times are more than three times, and the time of each dipping is 10-30 s.
Preferably, the atmosphere of the heat treatment is an air atmosphere; the temperature of the heat treatment is 300-500 ℃, and the heat preservation time is 2-4 h.
Preferably, the temperature rising rate from room temperature to the temperature of the heat treatment is 10-15 ℃/min.
Preferably, the thickness of the ionic liquid conversion film is 45.0-50.0 μm.
The invention provides a method for preparing an ionic liquid conversion film on the surface of magnesium alloy, and in the invention, the cation of the tetramethylguanidine phosphate ionic liquid is easy to provide NH 2 + And (similar to weak acid), activating the surface of the magnesium alloy in the treatment process, and decomposing the tetramethylguanidine phosphate ionic liquid in the heat treatment process to perform physical and chemical adsorption with the surface of the magnesium alloy so as to generate an ionic liquid conversion film with an anti-corrosion effect. The method provided by the invention can obviously improve the combination between the ionic liquid conversion film and the surface of the magnesium alloy matrix, and the generated ionic liquid conversion film has uniform crystal grain size and compact arrangement, is not influenced by the shape of the magnesium alloy matrix and has good anti-corrosion performance. The ionic liquid conversion film prepared by the invention is nontoxic, environment-friendly and capable ofCan process complex shapes and large magnesium alloy devices. Meanwhile, the method is simple to operate, uses conventional instruments, has no potential safety hazard, has a short experimental period, and is suitable for mass production and application.
Drawings
FIG. 1 is an SEM image of the surface of a magnesium alloy substrate prepared by pretreatment according to the present invention; wherein, the (a) of fig. 1 is 1000 times scanning electron microscope photo of the surface of the AZ31B magnesium alloy, and the (b) of fig. 1 is 5000 times scanning electron microscope photo of the surface of the magnesium alloy treated by the tetramethylguanidine phosphate ionic liquid at 400 ℃;
FIG. 2 is an SEM image of the surface of a gray black band coated magnesium sheet prepared in examples 1 to 3 of the present invention, wherein (a) of FIG. 2 is a 5000-fold SEM image of the surface of a magnesium alloy treated with tetramethylguanidine phosphate ionic liquid at 300 deg.C, (b) of FIG. 2 is a 5000-fold SEM image of the surface of a magnesium alloy treated with tetramethylguanidine phosphate ionic liquid at 400 deg.C, and (c) of FIG. 2 is a 5000-fold SEM image of the surface of a magnesium alloy treated with tetramethylguanidine phosphate ionic liquid at 500 deg.C;
FIG. 3 is a comparison of polarization curves for AZ31B magnesium alloy substrates and gray black band coated magnesium flakes prepared in examples 1-2.
Detailed Description
The invention provides a method for preparing an ionic liquid conversion film on the surface of magnesium alloy, which comprises the following steps:
soaking the magnesium alloy in a mixed solution containing tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol; the mass fraction of the tetramethylguanidine phosphate ionic liquid in the mixed solution is 30 percent;
and carrying out heat treatment on the immersed magnesium alloy to obtain the ionic liquid conversion film on the surface of the magnesium alloy.
The magnesium alloy is soaked in a mixed solution containing tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol. In the present invention, the magnesium alloy is preferably a Mg-Al-Si alloy. In the present invention, the magnesium alloy preferably further comprises a pretreatment before impregnation; the pretreatment preferably comprises sanding and ultrasonic cleaning in sequence. In the invention, SiC sand paper of 800 meshes, 1500 meshes and 2000 meshes is adopted in sequence for grinding the magnesium alloy. The method can remove the oxide film on the surface of the magnesium alloy by adopting sand paper for polishing, and is favorable for releasing magnesium ions on the surface of the magnesium alloy during dipping. In the present invention, the ultrasonic cleaning preferably includes cleaning mixed liquid ultrasonic cleaning and water ultrasonic cleaning performed in sequence; the cleaning mixed liquid is preferably a mixed liquid of absolute ethyl alcohol and acetone; the volume ratio of the absolute ethyl alcohol to the acetone in the cleaning mixed solution is preferably 1: 1. In the present invention, the water is preferably deionized water. The invention ensures that the magnesium alloy and the tetramethylguanidine phosphate ionic liquid fully react through ultrasonic cleaning, and provides a favorable basis for the subsequent formation of the ionic liquid conversion film with excellent corrosion resistance.
In the invention, the mass fraction of the tetramethylguanidine phosphate ionic liquid in the mixed solution containing the tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol is preferably 10-30%, and more preferably 30%. According to the invention, absolute ethyl alcohol is used as a solvent to dilute the tetramethylguanidine phosphate ionic liquid, and the thickness of the prepared ionic liquid conversion film is controlled; compared with other organic solvents, the preparation method has the advantage that the preparation method is more environment-friendly due to the adoption of absolute ethyl alcohol. In the present invention, the preparation method of the tetramethylguanidine phosphate ionic liquid preferably comprises: mixing diisooctyl phosphate, tetramethylguanidine and an organic solvent, and carrying out ion exchange reaction to obtain the tetramethylguanidine phosphate ionic liquid. In the present invention, the molar ratio of diisooctyl phosphate to tetramethylguanidine is preferably 1: 1. In the present invention, the organic solvent is preferably dichloromethane. In the present invention, the reaction is preferably carried out under the protection of inert gas; the temperature of the reaction is preferably room temperature; the reaction time is preferably 4-12 h; the reaction is preferably carried out under stirring. According to the invention, preferably, after the reaction, the obtained system is cooled to room temperature, and the solvent is removed by evaporation under reduced pressure to obtain the tetramethylguanidine phosphate ionic liquid. In the invention, the tetramethylguanidine phosphate ionic liquid is a light yellow oily liquid.
In the invention, the dipping temperature is preferably 20-35 ℃. In the invention, the dipping times are preferably more than three times, and the time of each dipping is preferably 10-30 s. The invention adopts the dipping method to ensure that the tetramethylguanidine phosphate ionic liquid in the mixed solution is uniformly distributed on the surface of the magnesium alloy.
After the impregnation, the impregnated magnesium alloy is subjected to heat treatment, and an ionic liquid conversion film is obtained on the surface of the magnesium alloy. In the present invention, the atmosphere of the heat treatment is preferably an air atmosphere; the temperature of the heat treatment is preferably 300-500 ℃, and more preferably 400 ℃; the heat preservation time is preferably 2-4 h. In the heat treatment process, magnesium ions on the surface of the magnesium alloy and the tetramethylguanidine phosphate ionic liquid which is subjected to thermal decomposition are subjected to physical and chemical adsorption in a high-temperature environment, so that the ionic liquid conversion film is obtained on the surface of the magnesium alloy.
In the present invention, the rate of temperature increase from room temperature to the temperature of the heat treatment is preferably 10 to 15 ℃/min, more preferably 10 ℃/min.
In the present invention, preferably, after the heat treatment, the obtained magnesium alloy is sequentially subjected to furnace cooling, water washing, and drying.
In the invention, the thickness of the ionic liquid conversion film is preferably 45.0-50.0 μm, and more preferably 44.97 μm.
The preparation process provided by the invention is simple, does not contain heavy metal elements of hexavalent chromium and nickel, is environment-friendly, and after the magnesium alloy matrix is treated by the mixed solution of the tetramethylguanidine phosphate ionic liquid and the absolute ethyl alcohol, the conversion film layer generated on the surface of the magnesium alloy matrix is compact and strong in binding force, and cations in the ionic liquid on the surface of the conversion film can easily provide protons NH in the treatment process 2 + (similar to weak acids) to activate the magnesium surface. The ionic liquid conversion film prepared by the invention can protect the magnesium alloy matrix in a corrosive environment, and the technology can effectively replace chromate treatment on the surface of the magnesium alloy.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The chemical compositions of the AZ31B magnesium alloy used in the examples of the present invention are shown in table 1.
TABLE 1AZ31B magnesium alloy chemical composition
Example 1
(1) Using AZ31B magnesium alloy as a base material, cutting an AZ31B magnesium alloy cast sample into magnesium alloy sheets with the thickness of 10mm multiplied by 0.5mm, polishing the magnesium alloy sheets by using sand paper, placing the magnesium alloy sheets into a mixed solution of absolute ethyl alcohol and acetone (the volume ratio of the absolute ethyl alcohol to the acetone is 1:1) for ultrasonic cleaning for 15min, then placing the magnesium alloy sheets into deionized water for ultrasonic cleaning for 10min, and cleaning the magnesium alloy sheets for later use;
(2) preparing a mixed solution of tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol, wherein the mass content of the tetramethylguanidine phosphate ionic liquid is 30%;
(3) immersing the magnesium alloy sample treated in the step (1) into the mixed solution in the step (2), wherein each sample is immersed for at least 3 times;
(4) placing the sample soaked in the step (3) in a muffle furnace, setting the temperature in the furnace to be 300 ℃, preserving the heat for 2 hours, and then cooling along with the furnace, wherein the heating rate of the muffle furnace is 10 ℃/min;
(5) and (4) placing the sample subjected to heat treatment in the step (4) into deionized water for ultrasonic cleaning for 10min, and drying to obtain a gray black ribbon coating magnesium sheet.
Example 2
(1) Using AZ31B magnesium alloy as a base material, cutting an AZ31B magnesium alloy cast sample into magnesium alloy sheets with the thickness of 10mm multiplied by 0.5mm, polishing the magnesium alloy sheets by using sand paper, placing the magnesium alloy sheets into a mixed solution of absolute ethyl alcohol and acetone (the volume ratio of the absolute ethyl alcohol to the acetone is 1:1) for ultrasonic cleaning for 15min, then placing the magnesium alloy sheets into deionized water for ultrasonic cleaning for 10min, and cleaning the magnesium alloy sheets for later use;
(2) preparing a mixed solution of tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol, wherein the mass content of the tetramethylguanidine phosphate ionic liquid is 30%;
(3) immersing the magnesium alloy sample treated in the step (1) into the mixed solution in the step (2), wherein each sample is immersed for at least 3 times;
(4) placing the sample soaked in the step (3) in a muffle furnace, setting the temperature in the furnace to be 400 ℃, preserving the heat for 2 hours, and then cooling along with the furnace, wherein the heating rate of the muffle furnace is 10 ℃/min;
(5) and (4) placing the sample subjected to heat treatment in the step (4) into deionized water for ultrasonic cleaning for 10min, and drying to obtain a gray black ribbon coating magnesium sheet.
Example 3
(1) Using AZ31B magnesium alloy as a base material, cutting an AZ31B magnesium alloy cast sample into magnesium alloy sheets with the thickness of 10mm multiplied by 0.5mm, polishing the magnesium alloy sheets by using sand paper, placing the magnesium alloy sheets into a mixed solution of absolute ethyl alcohol and acetone (the volume ratio of the absolute ethyl alcohol to the acetone is 1:1) for ultrasonic cleaning for 15min, then placing the magnesium alloy sheets into deionized water for ultrasonic cleaning for 10min, and cleaning the magnesium alloy sheets for later use;
(2) preparing a mixed solution of tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol, wherein the mass content of the tetramethylguanidine phosphate ionic liquid is 30%;
(3) immersing the magnesium alloy sample treated in the step (1) into the mixed solution in the step (2), wherein each sample is immersed for at least 3 times;
(4) placing the sample soaked in the step (3) in a muffle furnace, setting the temperature in the furnace to be 500 ℃, preserving the heat for 2 hours, and then cooling along with the furnace, wherein the heating rate of the muffle furnace is 10 ℃/min;
(5) and (4) placing the sample subjected to heat treatment in the step (4) into deionized water for ultrasonic cleaning for 10min, and drying to obtain a gray black ribbon coating magnesium sheet.
FIG. 1 is an SEM image of the surface of a magnesium alloy substrate prepared by pretreatment according to the present invention; wherein (a) in fig. 1 is a 1000-fold scanning electron microscope photograph of the surface of the AZ31B magnesium alloy, and (b) in fig. 1 is a 5000-fold scanning electron microscope photograph of the surface of the magnesium alloy treated with the tetramethylguanidine phosphate ionic liquid at 400 ℃. As can be seen from FIG. 1, the surface of the magnesium alloy substrate has been corroded to form pores due to the exposure of the magnesium alloy substrate in air, and the surface of the magnesium alloy substrate is damaged to a large extent.
FIG. 2 is an SEM image of the surface of a gray black band coated magnesium sheet prepared in examples 1 to 3 of the present invention, wherein (a) in FIG. 2 is a scanning electron micrograph of the surface of a magnesium alloy treated with tetramethylguanidine phosphate ionic liquid at 300 ℃ at 5000 times, (b) in FIG. 2 is a scanning electron micrograph of the surface of a magnesium alloy treated with tetramethylguanidine phosphate ionic liquid at 400 ℃ at 5000 times, and (c) in FIG. 2 is a scanning electron micrograph of the surface of a magnesium alloy treated with tetramethylguanidine phosphate ionic liquid at 500 ℃ at 5000 times. As can be seen by comparison, the ionic liquid conversion coating prepared in example 2 has a distinct morphology difference from the ionic liquid conversion coatings prepared in the other two examples, and the corrosion resistance effect in 3.5 wt% NaCl solution is the best, which indicates that under the condition, magnesium ions on the surface of the magnesium alloy matrix fully react with the ionic liquid after thermal decomposition, so that the ionic liquid conversion coating with the corrosion resistance is formed.
The polarization curves of the AZ31B magnesium alloy substrate and the gray black band coated magnesium plate prepared in examples 1-2 are shown in FIG. 3. The electrolyte for testing the polarization curve is a NaCl solution with the mass fraction of 3.5%, and the test conditions are as follows: under the condition of room temperature, carrying out potential polarization measurement at a scanning rate of 0.166mV/s under-300- +600mV and open circuit potential; platinum sheet (25 mm. times.25 mm. times.0.2 mm) as a counter electrode, AgCl as a reference electrode, and an exposed area of 1cm 2 The disk-shaped AZ31B sample was used as a working electrode.
As can be seen from FIG. 3, the corrosion potential in the polarization curve corresponding to the magnesium alloy sample treated at 400 ℃ is shifted forward, and the corrosion current density is significantly reduced, indicating that the magnesium alloy sample has a certain corrosion inhibition effect on the surface of the magnesium alloy.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for preparing an ionic liquid conversion film on the surface of a magnesium alloy comprises the following steps:
soaking the magnesium alloy in a mixed solution containing tetramethylguanidine phosphate ionic liquid and absolute ethyl alcohol; the mass fraction of the tetramethylguanidine phosphate ionic liquid in the mixed solution is 10-30%;
and carrying out heat treatment on the immersed magnesium alloy to obtain the ionic liquid conversion film on the surface of the magnesium alloy.
2. The method according to claim 1, wherein the magnesium alloy is a Mg-Al-Si based alloy.
3. The method of claim 1, wherein the magnesium alloy further comprises a pretreatment prior to impregnation; the pretreatment comprises sand paper grinding and ultrasonic cleaning which are sequentially carried out.
4. The method according to claim 3, wherein the sand paper for grinding the magnesium alloy is SiC sand paper of 800 mesh, 1500 mesh and 2000 mesh in this order.
5. The method according to claim 3, wherein the ultrasonic cleaning comprises cleaning mixed liquid ultrasonic cleaning and water ultrasonic cleaning which are performed in sequence; the cleaning mixed liquid is a mixed liquid of absolute ethyl alcohol and acetone.
6. The method of claim 1, wherein the tetramethylguanidine phosphate ionic liquid is prepared by a method comprising: mixing diisooctyl phosphate, tetramethylguanidine and an organic solvent, and carrying out ion exchange reaction to obtain the tetramethylguanidine phosphate ionic liquid.
7. The method according to claim 1, wherein the temperature of the impregnation is 20-35 ℃; the dipping times are more than three times, and the time of each dipping is 10-30 s.
8. The method according to claim 1, wherein the atmosphere of the heat treatment is an air atmosphere; the temperature of the heat treatment is 300-500 ℃, and the heat preservation time is 2-4 h.
9. The method according to claim 8, wherein the temperature rising rate from room temperature to the temperature of the heat treatment is 10 to 15 ℃/min.
10. The method according to claim 1, wherein the ionic liquid conversion membrane has a thickness of 45.0 to 50.0 μm.
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| CN115505912A (en) * | 2022-10-10 | 2022-12-23 | 中国科学院兰州化学物理研究所 | Copper alloy chromium-free passivator, preparation method and application thereof, and method for passivating copper alloy |
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| US20150090369A1 (en) * | 2013-10-02 | 2015-04-02 | Ut-Battelle, Llc | Corrosion prevention of magnesium surfaces via surface conversion treatments using ionic liquids |
| CN112142778A (en) * | 2020-10-10 | 2020-12-29 | 中国科学院兰州化学物理研究所 | Ionic liquid with oil solubility and water solubility as well as preparation method and application thereof |
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| US20150090369A1 (en) * | 2013-10-02 | 2015-04-02 | Ut-Battelle, Llc | Corrosion prevention of magnesium surfaces via surface conversion treatments using ionic liquids |
| CN112142778A (en) * | 2020-10-10 | 2020-12-29 | 中国科学院兰州化学物理研究所 | Ionic liquid with oil solubility and water solubility as well as preparation method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115505912A (en) * | 2022-10-10 | 2022-12-23 | 中国科学院兰州化学物理研究所 | Copper alloy chromium-free passivator, preparation method and application thereof, and method for passivating copper alloy |
| CN115505912B (en) * | 2022-10-10 | 2023-10-27 | 中国科学院兰州化学物理研究所 | Chromium-free passivating agent for copper alloy, preparation method and application thereof, and method for passivating copper alloy |
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