CN116082916A - Efficient anti-corrosion hole sealing liquid for magnesium alloy surface and application thereof - Google Patents
Efficient anti-corrosion hole sealing liquid for magnesium alloy surface and application thereof Download PDFInfo
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Abstract
The invention provides a magnesium alloy surface efficient corrosion-resistant hole sealing liquid and application thereof, and relates to the technical field of metal surface treatment, the magnesium alloy surface efficient corrosion-resistant hole sealing liquid comprises 1-35 parts of a main film forming agent, 1-35 parts of a pH regulator, 1-30 parts of a wetting agent and 1-30 parts of a dispersing agent, and the balance of water, wherein the hole sealing liquid is 100 parts of the total proportion, and the epoxy resin, the nano particles and other dispersing agents with low price are added.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to an efficient anti-corrosion hole sealing liquid for a magnesium alloy surface and application thereof.
Background
The magnesium alloy has the advantages of good light weight, cutting processing, dimensional stability, shock absorption, impact resistance, strong electromagnetic shielding property and the like, is widely applied to the fields of 3C products (computers, consumer electronics, communication), aerospace, architectural decoration, medical rehabilitation appliances and the like, however, the chemical property of the magnesium alloy is very active, the standard electrode potential is extremely low and is about-2.37V, the magnesium alloy is extremely easy to corrode, the application of the magnesium alloy in industry is severely restricted, and effective protective measures on the surface of the magnesium alloy are indispensable for improving the industrial application value of the magnesium alloy.
At present, the surface treatment technology for improving the corrosion resistance of the magnesium alloy comprises a plurality of methods such as a chemical conversion film, electrochemical oxidation, a metal plating layer, ion implantation, organic coating treatment, surface diffusion layer treatment, micro-arc oxidation treatment, physical vapor deposition treatment and the like, wherein the chemical conversion film has a simple process and is focused by more and more scholars, however, the corrosion resistance is realized by simply using the chemical conversion method, and certain defects are still present, so the trend in the present stage is to increase hole sealing treatment after the chemical conversion film is formed, thus the compactness of the surface of the magnesium alloy can be obviously improved, and the corrosion resistance of the magnesium alloy is further improved.
According to the principle, the hole sealing technology mainly comprises three major types of hydration reaction, namely inorganic filling and organic filling, the technology of hydration hole sealing is simple, but the hole sealing temperature is higher, the energy consumption is higher, the hole sealing effect on larger diameter holes is poor, the common hole sealing liquid used for inorganic filling comprises chromate, phosphate, titanate, zirconate, silicate and the like, the silicate is a hole sealing technology which is more used, silicon dioxide is generated through hydrolysis so as to seal holes, and the electrolyte and the coating preparation method for preparing a self-sealing micro-arc oxidation coating on the surface of the magnesium alloy are as reported in Chinese patent CN 112899754A. However, the sealing effect of this method is largely dependent on the degree of hydrolysis of silicate, and has a certain limitation. The sealing liquid of the invention comprises 50-100 g/L of aqueous fluorine-containing resin, 1-5 g/L of alkaline substance, 5-10 g/L of complexing agent and 0.2-2 mL/L of wetting agent, and the AZ91D magnesium alloy has excellent corrosion resistance after being treated by the sealing agent, is superior in salt spray test, and can remarkably reduce the generation of white spots on the surface of the AZ91D magnesium alloy. However, fluorine-containing substances are expensive and are not friendly to the environment, so that development of a magnesium alloy hole sealing liquid with low cost and strong corrosion resistance is necessary.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the efficient anti-corrosion hole sealing liquid for the magnesium alloy surface and the application thereof, and solves the proportioning problem of the efficient anti-corrosion hole sealing liquid for the magnesium alloy surface and the practical application problem of the efficient anti-corrosion hole sealing liquid for the magnesium alloy surface.
Technical proposal
In order to achieve the above purpose, the invention is realized by the following technical scheme: the efficient anti-corrosion hole sealing liquid for the magnesium alloy surface comprises the following components:
main film forming agent, pH regulator, wetting agent and dispersing agent.
Preferably, the components are as follows:
1-35 parts of main film forming agent, 1-35 parts of pH regulator, 1-30 parts of wetting agent, 1-30 parts of dispersing agent and the balance of water, wherein the total proportion of the hole sealing liquid is 100 parts.
Preferably, the primary film former is any combination of one or more of 6101-bisphenol A type epoxy high viscosity resin, 6002-bisphenol A type epoxy high viscosity resin, C909221 hydrogenated bisphenol A epoxy resin, AG-80 epoxy resin (M812989N, N, N, N, -tetraepoxypropyl-4, 4-diaminodiphenyl methane), AFG-90M epoxy resin (G890309 triglycidyl meta-aminophenol), cycloaliphatic epoxy resin (B836425 bis (7-oxabicyclo [4.1.0] 3-heptylmethyl) adipate), N890315N, N, N ', N ' -tetraglycidyl-4, 4' -diaminodiphenyl ether, modified polyurethane glass fibers.
Preferably, the pH regulator is N, N-dimethylformamide, triethanolamine, diethanolamine, ethylenediamine, triethylamine, 1, 2-propylenediamine, triisopropanolamine, formamide, acrylamide, dimethylformamide, hexamethyleneimine, diphenylamine, polyethyleneimine, and any combination of one or more of sulfonic acids and sulfonic acids.
Preferably, the wetting agent is any combination of one or more of castor oil polyoxyethylene ether (EL-40), coconut oil fatty acyl diethanol amine (6501), tridecyl isomeric alcohol ether (TO-8), fatty alcohol polyoxyethylene ether (AEO-9), coco polyoxyethylene ether (CD-10), tween 20, C875609 cocoamidopropyl betaine, L921964 lauramidopropyl betaine, cocoamidopropyl Hydroxysulfobetaine (CHSB), lauramidopropyl hydroxysulfobetaine (LHSB-35), lauramidopropyl ammonium oxide (LAO-30), lauramidopolyether (1205).
Preferably, the dispersing agent is any combination of one or more of aqueous nano silicon dioxide solution (5-20 nm) and hydrophilic nano aluminum oxide solution (30 nm).
Preferably, the method comprises the following steps:
sp1, preparing hole sealing liquid, sequentially preparing a main film forming agent, a pH regulator, a wetting agent and a dispersing agent, and performing ultrasonic treatment for 10min for later use;
sp2, sequentially polishing, acid washing, water washing, alkaline degreasing treatment, water washing, citric acid activation, water washing, potassium hydroxide surface conditioning, water washing, phosphate passivation and water washing for later use;
sp3, hole sealing treatment, namely immersing a workpiece of Sp2 into the hole sealing liquid in Sp1 for sealing treatment for 1-5min, and drying at 120 ℃ for 30min to obtain a magnesium alloy passivation sealing film;
sp4, performing corrosion liquid titration test to test corrosion resistance of magnesium alloy, wherein the corrosion liquid comprises the following components: 15-20g of anhydrous ferric trichloride, 1-10g of copper sulfate pentahydrate and 100g of water.
Advantageous effects
The invention provides an efficient anti-corrosion hole sealing liquid for a magnesium alloy surface and application thereof. The beneficial effects are as follows:
1. the invention adds the dispersing agents such as the epoxy resin, the nano particles and the like with low price, obviously improves the compactness of the coating, reduces the dosage of the fluorine-containing resin, greatly reduces the cost and is friendly to the environment;
2. the invention uses the surfactant as the wetting agent, solves the problems that the nanoparticle system is difficult to disperse and the hole sealing rate is low;
3. compared with the traditional sealing agent, the sealing liquid prepared by the invention has good corrosion resistance when being applied to the surface of magnesium alloy.
Drawings
FIG. 1 is a diagram showing the microscopic morphology of a magnesium alloy film layer according to example 2 of the present invention;
FIG. 2 is a graph showing the microscopic morphology of the magnesium alloy film layer of comparative example 1 of the present invention;
FIG. 3 is a graph showing the microscopic morphology of the magnesium alloy film layer of comparative example 2 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First embodiment:
as shown in fig. 1-3, the efficient anti-corrosion hole sealing liquid for the magnesium alloy surface comprises the following components:
the main film forming agent, the pH regulator, the wetting agent and the dispersing agent comprise the following components in parts by weight: 1-35 parts of main film forming agent, 1-35 parts of pH regulator, 1-30 parts of wetting agent and 1-30 parts of dispersing agent, wherein the total proportion of the hole sealing liquid is 100 parts, the main film forming agent is 6101-bisphenol A type epoxy high viscosity resin, 6002-bisphenol A type epoxy high viscosity resin, C909221 hydrogenated bisphenol A epoxy resin, AG-80 epoxy resin (M812989N, N, N, -tetraepoxypropyl-4, 4-diaminodiphenyl methane), AFG-90M epoxy resin (G890309 triglycidyl meta-aminophenol), alicyclic epoxy resin (B836425 bis (7-oxabicyclo [4.1.0] 3-heptylmethyl) adipate), N890315N, N ', N ' -tetraglycidyl-4, 4' -diaminodiphenyl ether, modified polyurethane glass fiber or any combination of a plurality of the above, the pH regulator is one or more of N, N-dimethylformamide, triethanolamine, diethanolamine, ethylenediamine, triethylamine, 1, 2-propylenediamine, triisopropanolamine, formamide, acrylamide, dimethylformamide, hexamethyleneimine, diphenylamine, polyethyleneimine, sulfonic acid and sulfonic acid, and the wetting agent is castor oil polyoxyethylene ether (EL-40), coconut oil fatty acyl diethanolamine (6501), tridecyl isomeric alcohol ether (TO-8), fatty alcohol polyoxyethylene ether (AEO-9), coco polyoxyethylene ether (CD-10), tween 20, C875609 cocoamidopropyl betaine, L921964 lauramidopropyl betaine, cocoamidopropyl Hydroxysulfobetaine (CHSB), any combination of one or more of lauramidopropyl hydroxysulfobetaine (LHSB-35), lauramidopropyl ammonium oxide (LAO-30) and laurylamine polyether (1205), and the dispersing agent is any combination of one or more of aqueous nano-silica solution (5-20 nm) and hydrophilic nano-alumina solution (30 nm).
The method comprises the following steps:
sp1, preparing hole sealing liquid, sequentially preparing a main film forming agent, a pH regulator, a wetting agent and a dispersing agent, and performing ultrasonic treatment for 10min for later use;
sp2, sequentially polishing, acid washing, water washing, alkaline degreasing treatment, water washing, citric acid activation, water washing, potassium hydroxide surface conditioning, water washing, phosphate passivation and water washing for later use;
sp3, hole sealing treatment, namely immersing a workpiece of Sp2 into hole sealing liquid in Sp1 for sealing treatment for 1-5min, and drying at 120 ℃ for 30min to obtain a magnesium alloy passivation sealing film;
sp4, performing corrosion liquid titration test to test corrosion resistance of magnesium alloy, wherein the corrosion liquid comprises the following components: 15-20g of anhydrous ferric trichloride, 1-10g of copper sulfate pentahydrate and 100g of water.
Specific embodiment II:
an efficient anti-corrosion hole sealing liquid for a magnesium alloy surface and application thereof are provided, wherein the following embodiments are adopted:
example 1
(1) Preparing a magnesium alloy hole sealing liquid: dissolving 25 parts by mass of 6101-bisphenol A type epoxy high viscosity resin in 1000 parts by mass of water, sequentially adding 10 parts by mass of triisopropanolamine, 5 parts by mass of coconut oil fatty acyl diethanol amine (6501) and 5 parts by mass of 10nm aqueous silicon dioxide, mixing, and performing ultrasonic dispersion for 10min to obtain the magnesium alloy hole sealing liquid.
(2) The hole sealing treatment process of the magnesium alloy comprises the following steps: sequentially carrying out pickling for 30s, washing 2 times (20 s each time), alkaline degreasing treatment for 5min, washing 2 times, citric acid activation for 1min, washing 2 times, potassium hydroxide surface adjustment for 5min, washing 2 times, phosphate passivation for 1min, washing 2 times, immersing a workpiece in hole sealing liquid for hole sealing treatment for 1min, washing, and drying at 120 ℃ for 30min to obtain the magnesium alloy passivation sealing film.
(3) Corrosion resistance test of magnesium alloy: 15 parts by mass of anhydrous ferric trichloride and 5 parts by mass of cupric sulfate pentahydrate are dissolved in 100 parts by mass of water to obtain a corrosive liquid, the corrosive liquid is titrated on magnesium alloy, and the corrosion time is observed and recorded.
Example 2
(1) Preparing a magnesium alloy hole sealing liquid: dissolving 50 parts by mass of 6101-bisphenol A type epoxy high viscosity resin in 1000 parts by mass of water, sequentially adding 20 parts by mass of triisopropanolamine, 10 parts by mass of coconut oil fatty acyl diethanol amine (6501) and 5 parts by mass of 10nm aqueous silicon dioxide, mixing, and performing ultrasonic dispersion for 10min to obtain the magnesium alloy hole sealing liquid.
(2) The hole sealing treatment process of the magnesium alloy comprises the following steps: sequentially carrying out pickling for 30s, washing 2 times (20 s each time), alkaline degreasing treatment for 5min, washing 2 times, citric acid activation for 1min, washing 2 times, potassium hydroxide surface adjustment for 5min, washing 2 times, phosphate passivation for 1min, washing 2 times, immersing a workpiece in hole sealing liquid for hole sealing treatment for 1min, washing, and drying at 120 ℃ for 30min to obtain the magnesium alloy passivation sealing film.
(3) Corrosion resistance test of magnesium alloy: 15 parts by mass of anhydrous ferric trichloride and 5 parts by mass of cupric sulfate pentahydrate are dissolved in 100 parts by mass of water to obtain a corrosive liquid, the corrosive liquid is titrated on magnesium alloy, and the corrosion time is observed and recorded.
Example 3
(1) Preparing a magnesium alloy hole sealing liquid: dissolving 75 parts by mass of 6101-bisphenol A type epoxy high viscosity resin in 1000 parts by mass of water, sequentially adding 30 parts by mass of triisopropanolamine, 15 parts by mass of coconut oil fatty acyl diethanol amine (6501) and 5 parts by mass of 10nm aqueous silicon dioxide, mixing, and performing ultrasonic dispersion for 10min to obtain the magnesium alloy hole sealing liquid.
(2) The hole sealing treatment process of the magnesium alloy comprises the following steps: sequentially carrying out pickling for 30s, washing 2 times (20 s each time), alkaline degreasing treatment for 5min, washing 2 times, citric acid activation for 1min, washing 2 times, potassium hydroxide surface adjustment for 5min, washing 2 times, phosphate passivation for 1min, washing 2 times, immersing a workpiece in hole sealing liquid for hole sealing treatment for 1min, washing, and drying at 120 ℃ for 30min to obtain the magnesium alloy passivation sealing film.
(3) Corrosion resistance test of magnesium alloy: 15 parts by mass of anhydrous ferric trichloride and 5 parts by mass of cupric sulfate pentahydrate are dissolved in 100 parts by mass of water to obtain a corrosive liquid, the corrosive liquid is titrated on magnesium alloy, and the corrosion time is observed and recorded.
Example 4
(1) Preparing a magnesium alloy hole sealing liquid: 50 parts by mass of AG-80 epoxy resin (M812989N, N, N, N-tetraepoxypropyl-4, 4-diaminodiphenyl methane) is dissolved in 1000 parts by mass of water, 20 parts by mass of triisopropanolamine, 10 parts by mass of coconut fatty acyl diethanol amine (6501) and 5 parts by mass of 10nm aqueous silicon dioxide are sequentially added, and the mixture is mixed and dispersed for 10 minutes by ultrasonic to obtain the magnesium alloy hole sealing liquid.
(2) The hole sealing treatment process of the magnesium alloy comprises the following steps: sequentially carrying out pickling for 30s, washing 2 times (20 s each time), alkaline degreasing treatment for 5min, washing 2 times, citric acid activation for 1min, washing 2 times, potassium hydroxide surface adjustment for 5min, washing 2 times, phosphate passivation for 1min, washing 2 times, immersing a workpiece in hole sealing liquid for hole sealing treatment for 1min, washing, and drying at 120 ℃ for 30min to obtain the magnesium alloy passivation sealing film.
(3) Corrosion resistance test of magnesium alloy: 15 parts by mass of anhydrous ferric trichloride and 5 parts by mass of cupric sulfate pentahydrate are dissolved in 100 parts by mass of water to obtain a corrosive liquid, the corrosive liquid is titrated on magnesium alloy, and the corrosion time is observed and recorded.
Example 5
(1) Preparing a magnesium alloy hole sealing liquid: 50 parts by mass of alicyclic epoxy resin (B836425 bis (7-oxabicyclo [4.1.0] 3-heptylmethyl) adipate) is dissolved in 1000 parts by mass of water, and 20 parts by mass of triisopropanolamine, 10 parts by mass of coconut fatty acyl diethanol amine (6501) and 5 parts by mass of 10nm aqueous silicon dioxide are sequentially added, and the mixture is mixed and subjected to ultrasonic dispersion for 10 minutes to obtain the magnesium alloy hole sealing liquid.
(2) The hole sealing treatment process of the magnesium alloy comprises the following steps: sequentially carrying out pickling for 30s, washing 2 times (20 s each time), alkaline degreasing treatment for 5min, washing 2 times, citric acid activation for 1min, washing 2 times, potassium hydroxide surface adjustment for 5min, washing 2 times, phosphate passivation for 1min, washing 2 times, immersing a workpiece in hole sealing liquid for hole sealing treatment for 1min, washing, and drying at 120 ℃ for 30min to obtain the magnesium alloy passivation sealing film.
(3) Corrosion resistance test of magnesium alloy: 15 parts by mass of anhydrous ferric trichloride and 5 parts by mass of cupric sulfate pentahydrate are dissolved in 100 parts by mass of water to obtain a corrosive liquid, the corrosive liquid is titrated on magnesium alloy, and the corrosion time is observed and recorded.
Third embodiment:
an efficient anti-corrosion hole sealing liquid for magnesium alloy surface and application thereof are adopted in the following comparative examples:
comparative example 1: control group without hole sealing treatment
(1) The magnesium alloy passivation treatment process comprises the following steps: and (3) sequentially carrying out acid washing for 30s, water washing for 2 times (20 s each time), alkaline degreasing treatment for 5min, water washing for 2 times, citric acid activation for 1min, water washing for 2 times, potassium hydroxide surface adjustment for 5min, water washing for 2 times, phosphate passivation for 1min, and water washing for 30min after drying at 120 ℃ to obtain the magnesium alloy passivation sealing film.
(2) Corrosion resistance test of magnesium alloy: 15 parts by mass of anhydrous ferric trichloride and 5 parts by mass of cupric sulfate pentahydrate are dissolved in 100 parts by mass of water to obtain a corrosive liquid, the corrosive liquid is titrated on magnesium alloy, and the corrosion time is observed and recorded.
Comparative example 2: control group with traditional blocking agent
(1) Magnesium alloy hole sealing liquid: 50 parts by mass of sodium silicate are dissolved in 1000 parts by mass of water;
(2) The hole sealing treatment process of the magnesium alloy comprises the following steps: sequentially carrying out pickling for 30s, washing for 2 times (20 s each time), alkaline degreasing treatment for 5min, washing for 2 times, citric acid activation for 1min, washing for 2 times, potassium hydroxide surface adjustment for 5min, washing for 2 times, phosphate passivation for 1min, washing for 2 times, immersing a workpiece in the magnesium alloy film sealing agent for sealing at 85 ℃ for 2min, washing for 30min after drying at 120 ℃ to obtain the magnesium alloy passivation sealing film.
(3) Corrosion resistance test of magnesium alloy: 15 parts by mass of anhydrous ferric trichloride and 5 parts by mass of cupric sulfate pentahydrate are dissolved in 100 parts by mass of water to obtain a corrosive liquid, the corrosive liquid is titrated on magnesium alloy, and the corrosion time is observed and recorded.
According to the examples of the first embodiment and the comparative examples of the second embodiment, the following experimental results were obtained,
performance test:
TABLE 1 Corrosion resistance of magnesium alloy coating films
| Sample of | Etching time(s) |
| Example 1 | 29.11±1.27 |
| Examples2 | 32.36±0.98 |
| Example 3 | 28.58±1.13 |
| Example 4 | 26.91±1.72 |
| Example 5 | 27.32±0.89 |
| Comparative example 1 | 20.66±1.56 |
| Comparative example 2 | 24.27±2.11 |
As can be seen from the test results in table 1, the corrosion time of example 2 is the longest, the corrosion resistance is the best, and the formula ratio of the magnesium alloy hole sealing liquid and the types of epoxy resin of examples 1,3,4 and 5 are correspondingly adjusted compared with example 2, so that the corrosion time is slightly reduced, and the corrosion resistance is reduced; the comparative example 1 is a blank control, and has the worst corrosion resistance after no hole sealing treatment, which indicates that the surface of the magnesium alloy is more compact after the sealing treatment, and has larger influence on the corrosion performance; comparative example 2 is a traditional sealing agent, and the corrosion resistance is inferior to that of the sealing liquid, which shows that the sealing liquid of the invention is a multicomponent synergistic effect and can further improve the corrosion resistance of the magnesium alloy surface.
Fig. 1-3 are the magnesium alloy microcosmic morphology graphs of example 2, comparative example 1 and comparative example 2 respectively, and it is obvious that the magnesium alloy of example 2 has the least surface pore structure and the most compact morphology, while the magnesium alloy of comparative example 2 treated by the traditional sealing agent has the more increased pore number compared with the magnesium alloy of example 2, and the magnesium alloy of comparative example 1 which is not treated by the sealing agent has the most loose and porous morphology among the three, which shows that the magnesium alloy treated by the sealing liquid of the invention has the best effect on filling pores and the most compact surface, and also confirms the conclusion of the corrosive liquid drop test.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a high-efficient anticorrosive hole sealing liquid in magnesium alloy surface which characterized in that: the composition comprises the following components:
main film forming agent, pH regulator, wetting agent and dispersing agent.
2. The efficient corrosion-resistant hole sealing liquid for the surface of a magnesium alloy according to claim 1, which is characterized in that: the components are as follows in parts by weight:
1-35 parts of main film forming agent, 1-35 parts of pH regulator, 1-30 parts of wetting agent, 1-30 parts of dispersing agent and the balance of water, wherein the total proportion of the hole sealing liquid is 100 parts.
3. The efficient corrosion-resistant hole sealing liquid for the surface of a magnesium alloy according to claim 1, which is characterized in that: the main film forming agent is any combination of one or more of 6101-bisphenol A type epoxy high viscosity resin, 6002-bisphenol A type epoxy high viscosity resin, C909221 hydrogenated bisphenol A epoxy resin, AG-80 epoxy resin (M812989N, N, N, -tetraepoxypropyl-4, 4-diaminodiphenyl methane), AFG-90M epoxy resin (G890309 triglycidyl meta-aminophenol), alicyclic epoxy resin (B836425 bis (7-oxabicyclo [4.1.0] 3-heptyl) adipate), N890315N, N, N ', N ' -tetraglycidyl-4, 4' -diaminodiphenyl ether, polyurethane glycol solution and acrylic ester methacrylic acid resin.
4. The efficient corrosion-resistant hole sealing liquid for the surface of a magnesium alloy according to claim 1, which is characterized in that: the pH regulator is one or more of N, N-dimethylformamide, triethanolamine, diethanolamine, ethylenediamine, triethylamine, 1, 2-propylenediamine, triisopropanolamine, formamide, acrylamide, dimethylformamide, hexamethyleneimine, diphenylamine, polyethyleneimine, ethane sulfonic acid, hydroxyethane sulfonic acid, sulfamic acid and cyclohexyl sulfamic acid.
5. The efficient corrosion-resistant hole sealing liquid for the surface of a magnesium alloy according to claim 1, which is characterized in that: the wetting agent is one or more of castor oil polyoxyethylene ether (EL-40), coconut oil fatty acyl diethanol amine (6501), tridecyl isomeric alcohol ether (TO-8), fatty alcohol polyoxyethylene ether (AEO-9), coco polyoxyethylene ether (CD-10), tween 20, C875609 coco amide propyl betaine, L921964 lauramide propyl betaine, coco amide propyl hydroxysulfobetaine (CHSB), lauramide propyl hydroxysulfobetaine (LHSB-35), lauramide propyl ammonium oxide (LAO-30) and lauramide polyether (1205).
6. The efficient corrosion-resistant hole sealing liquid for the surface of a magnesium alloy according to claim 1, which is characterized in that: the dispersing agent is one or more of water-based nano silicon dioxide solution, hydrophilic nano aluminum oxide solution, alcohol ether ethoxylate and alcohol ether ethoxylate.
7. The application of the efficient anti-corrosion hole sealing liquid for the magnesium alloy surface as claimed in claim 1, which is characterized by comprising the following steps:
sp1, preparing a hole sealing liquid,
sp1.1 is respectively prepared into a main film forming agent, a pH regulator, a wetting agent and a dispersing agent
Sp1.2, carrying out ultrasonic treatment on the main film forming agent, the pH regulator, the wetting agent and the dispersing agent which are prepared by Sp1.1 for 10min to obtain hole sealing liquid;
sp2, sequentially polishing, pickling, washing, alkaline degreasing treatment, washing, citric acid activation, washing, potassium hydroxide surface adjustment, washing, phosphate passivation and washing the magnesium alloy for later use;
sp3, hole sealing treatment, namely immersing a workpiece of Sp2 into the hole sealing liquid in Sp1 for sealing treatment for 1-15min, and drying at 120 ℃ for 10-60min to obtain a magnesium alloy passivation sealing film;
sp4, performing corrosion liquid titration test.
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