Environment-friendly magnesium alloy machining fluid and preparation method thereof

Abstract

The present application relates to the field of processing liquid, in particular to an environment-friendly magnesium alloy processing liquid and a preparation method thereof, the magnesium alloy processing liquid comprises, by weight fraction: 5-10 parts of base oil, 5-15 parts of rust inhibitor, 0.1-2 parts of corrosion inhibitor, 10-20 parts of emulsifier, 0.05-0.2 parts of defoaming agent, 2-4 parts of wetting agent, 1-2 parts of pH regulator and 15-30 parts of deionized water; the rust inhibitor is a product prepared by ring-opening reaction of 3-amino trifluorotoluene and ethylene glycol diglycidyl ether as reactants. The magnesium alloy processing liquid prepared by the present application uses green and environment-friendly plant-based synthetic ester as base oil, which is environmentally friendly from raw materials to emissions, reducing environmental pollution. The processing liquid performs well in the processing of magnesium alloy material parts, can effectively prevent the oxidation discoloration of sensitive magnesium alloy and magnesium-aluminum alloy, inhibit the dissolution of magnesium ions, and has excellent lubricity and flame retardance.

Description

Technical Field

[0001] This invention relates to the field of processing fluids, specifically to an environmentally friendly magnesium alloy processing fluid and its preparation method. Background Technology

[0002] Magnesium alloys possess advantages such as low density, high specific strength and stiffness, good dimensional stability and machinability, and excellent electrical and thermal conductivity. Furthermore, they exhibit superior performance in electromagnetic shielding and vibration damping. As excellent lightweight structural materials, magnesium alloys are widely used in numerous fields including automotive, shipbuilding, aerospace, and electronics. Magnesium alloy processing fluids, as a core auxiliary material, provide essential cooling, lubrication, and cleaning functions, creating a favorable working environment for magnesium alloy processing.

[0003] The importance of magnesium alloy processing fluids lies in their ability to improve processing efficiency. Magnesium alloys have high melting and ignition points, and the processing process easily generates high temperatures. A suitable magnesium alloy processing fluid can effectively reduce processing temperatures, minimize deformation and surface quality issues, thereby improving processing efficiency and saving time and costs. Furthermore, magnesium alloy processing fluids also play a crucial role in improving product quality. Magnesium alloy products are prone to oxidation, deformation, and surface defects during production. Using magnesium alloy processing fluids can effectively prevent oxidation and deformation, increase product density and strength, and make the product surface smoother and more aesthetically pleasing.

[0004] Magnesium alloy machining fluids are mainly divided into two types: water-based and oil-based. Oil-based magnesium alloy machining fluids have excellent lubrication performance, suitable for high-load cutting. With the addition of various oil-based lubricating additives, they can form a tough protective film between the tool and the workpiece. However, oil-based machining fluids have relatively weak cooling performance, and their use and disposal may pose environmental pollution problems. Water-based magnesium alloy machining fluids are easier to handle and recycle, meeting the environmental protection requirements of modern industry. Due to their high specific heat capacity, they can quickly absorb and remove the heat generated during magnesium alloy machining, providing better cooling performance and preventing workpiece deformation due to overheating. However, water-based machining fluids generally have lower lubrication performance, and under certain extreme conditions of high-load, high-speed cutting, the strength of the lubricating film may be insufficient. Furthermore, because water-based machining fluids contain a large amount of water, rust may occur if the rust inhibitor is of poor quality or used improperly. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide an environmentally friendly magnesium alloy processing fluid and its preparation method.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides an environmentally friendly magnesium alloy processing fluid, comprising, by weight parts:

[0008] 5-10 parts base oil, 5-15 parts rust inhibitor, 0.1-2 parts corrosion inhibitor, 10-20 parts emulsifier, 0.05-0.2 parts defoamer, 2-4 parts wetting agent, 1-2 parts pH adjuster and 15-30 parts deionized water.

[0009] Preferably, the base oil is a plant-based synthetic ester, specifically at least one selected from trimethylolpropane trioleate, isooctyl palmitate, and sunflower seed oil glycerides. More preferably, it is trimethylolpropane trioleate, with a kinematic viscosity of 46-50 mmHg at 40°C. 2 / s, iodine value 85-100g I2 / 100g, acid value ≤1.8mg KOH / g.

[0010] Preferably, the rust inhibitor is a product prepared by a ring-opening reaction using 3-aminotrifluorotoluene and ethylene glycol diglycidyl ether as reactants.

[0011] Preferably, the corrosion inhibitor is at least one of benzotriazole (BTA), methylbenzotriazole (TTA), and triethanolamine borate (TEAB).

[0012] Preferably, the emulsifier is an EO-PO block copolymer, wherein the EO / PO molar ratio is 30-50:50-70, and the molecular weight is 1800-2500.

[0013] Preferably, the defoamer is a polyether-type defoamer, including at least one of TEGO Foamex 815N, TEGO Foamex 825, and TEGO Airex 901W.

[0014] Preferably, the wetting agent is a fatty alcohol polyoxyethylene ether, including one of AEO-3, AEO-7, AEO-9, and AEO-15.

[0015] Preferably, the pH adjuster is at least one of ethanolamine, diethanolamine, triethanolamine, and AMP-95.

[0016] Preferably, the method for preparing the rust inhibitor includes:

[0017] Weigh out 3-aminotrifluorotoluene and ethylene glycol diglycidyl ether and mix them in an organic solvent. Add an alkaline catalyst dropwise, purge with nitrogen as a protective gas, and place in a water bath at 70-100℃. Stir and react for 4-8 hours. After the reaction is complete, remove the solvent under reduced pressure to obtain the rust inhibitor.

[0018] Preferably, the solvent is at least one selected from tetrahydrofuran, acetone, acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide, and N,N-dimethylacetamide.

[0019] Preferably, the mass-to-volume ratio of 3-aminotrifluorotoluene, ethylene glycol diglycidyl ether, and organic solvent is (3.1-3.5) g: 1.74 g: (20-40) mL.

[0020] Preferably, the catalyst is triethylamine (TEA), and the amount added is 1.2%-2.4% of the mass of 3-aminotrifluorotoluene.

[0021] Secondly, the present invention provides a method for preparing an environmentally friendly magnesium alloy processing fluid, comprising the following steps:

[0022] Step 1: Heat the base oil to 50-60℃, add rust inhibitor and corrosion inhibitor, and stir for 10-20 hours until a homogeneous oil phase is formed;

[0023] Step 2: Add emulsifier and wetting agent to deionized water, maintain the temperature at 40-50℃ and stir thoroughly to obtain a homogeneous aqueous phase;

[0024] Step 3: Slowly add the oil phase to the aqueous phase (at a rate of 200 r / min), and then shear at a high speed of 3000-5000 r / min for 10-30 min, maintaining the temperature at 55-60℃ throughout the process to obtain a mixture;

[0025] Step 4: Reduce the stirring speed of the above mixture to 400-500 r / min, add defoamer and pH adjuster, stir evenly, cool to room temperature, and let stand for 24 hours to mature, and then obtain magnesium alloy processing fluid.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. The magnesium alloy processing fluid prepared by this invention uses environmentally friendly plant-based synthetic esters as the base oil, and is free of toxic substances such as chlorine, sulfur, phenols, and nitrites. The entire chain, from raw materials (bio-based) to emissions (low COD), is environmentally friendly, reducing environmental pollution. The magnesium alloy processing fluid performs excellently in the processing of magnesium alloy parts, effectively preventing oxidation and discoloration of sensitive magnesium alloys and magnesium-aluminum alloys, inhibiting the dissolution of magnesium ions, and also possessing excellent lubrication and flame-retardant properties.

[0028] 2. This invention's magnesium alloy processing fluid successfully solves the problems of corrosion and discoloration, as well as insufficient lubrication film strength, during magnesium alloy processing through a unique combination system of fluorocarbon rust inhibitors and corrosion inhibitors. The rust inhibitor contains a "fluorocarbon-epoxy" dual-active structure, where the fluorocarbon segments (F3C-C6H4-) provide ultra-low surface energy, forming a hydrophobic barrier; and the polyhydroxy epoxy segments chelate Mg... 2+A dense coordination film is formed on the surface of the magnesium alloy, thereby enhancing its durability under extreme conditions of high load and high speed cutting.

[0029] 3. The magnesium alloy processing fluid prepared by this invention has excellent resistance to hard water, with a hard water resistance of >15,000 ppm; its viscosity remains almost unchanged after being placed at 80°C for 7 days, demonstrating very good thermal stability.

[0030] 4. The magnesium alloy processing fluid prepared by this invention has strong compatibility with common machine tool sealing materials (NBR, FKM), and can be used in the production line of magnesium alloy motor housing (die casting + CNC) for new energy vehicles, and significantly improves the workpiece yield. Detailed Implementation

[0031] The technical solution of the present invention is illustrated below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or defining the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0032] To better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0033] The present invention will be further described below with reference to the following embodiments.

[0034] Example 1

[0035] An environmentally friendly magnesium alloy processing fluid, comprising, by weight:

[0036] 8 parts base oil, 10 parts rust inhibitor, 1.2 parts corrosion inhibitor, 15 parts emulsifier, 0.1 parts defoamer, 3 parts wetting agent, 1.3 parts pH adjuster and 26 parts deionized water.

[0037] The base oil is trimethylolpropane trioleate, with a kinematic viscosity of 46-50 mmHg at 40°C. 2 / s, iodine value 85-100gI2 / 100g, acid value ≤1.8mg KOH / g; the corrosion inhibitor is triethanolamine borate (TEAB); the emulsifier is EO-PO block copolymer, wherein the molar ratio of EO / PO is 30:70 and the molecular weight is 2100; the defoamer is polyether-type defoamer TEGOFoamex815N; the wetting agent is fatty alcohol polyoxyethylene ether AEO-7; the pH adjuster is AMP-95.

[0038] The preparation methods for rust inhibitors include:

[0039] Weigh 3.3g of 3-aminotrifluorotoluene and 1.74g of ethylene glycol diglycidyl ether and mix them in 30mL of tetrahydrofuran. Add triethylamine (TEA) as an alkaline catalyst, with the amount added being 1.8% of the mass of 3-aminotrifluorotoluene. Purge nitrogen gas as a protective gas and place the mixture in a water bath at 80℃. Stir and react for 6 hours. After the reaction is complete, remove the solvent under reduced pressure to obtain the rust inhibitor.

[0040] The preparation method of the above-mentioned environmentally friendly magnesium alloy working fluid includes the following steps:

[0041] Step 1: Heat the base oil to 55°C, add rust inhibitor and corrosion inhibitor, and stir for 10-20 hours until a homogeneous oil phase is formed;

[0042] Step 2: Add emulsifier and wetting agent to deionized water, maintain the temperature at 45°C and stir thoroughly to obtain a homogeneous aqueous phase;

[0043] Step 3: Slowly add the oil phase to the aqueous phase (at a rate of 200 r / min), and then shear at a high speed of 4000 r / min for 20 min, maintaining the temperature at 55°C throughout, to obtain a mixture;

[0044] Step 4: Reduce the stirring speed of the above mixture to 450 r / min, then add defoamer and pH adjuster, stir evenly, cool to room temperature, and let stand for 24 hours to mature, and then obtain magnesium alloy processing fluid.

[0045] Example 2

[0046] An environmentally friendly magnesium alloy processing fluid, comprising, by weight:

[0047] 6 parts base oil, 8 parts rust inhibitor, 0.5 parts corrosion inhibitor, 12 parts emulsifier, 0.08 parts defoamer, 3 parts wetting agent, 1.6 parts pH adjuster and 22 parts deionized water.

[0048] The base oil is isooctyl palmitate; the corrosion inhibitor is benzotriazole (BTA); the emulsifier is EO-PO block copolymer, wherein the EO / PO molar ratio is 30:70 and the molecular weight is 1800; the defoamer is polyether-type defoamer TEGO Foamex825; the wetting agent is fatty alcohol polyoxyethylene ether, including AEO-3; and the pH adjuster is ethanolamine.

[0049] The preparation methods for rust inhibitors include:

[0050] Weigh 3.1g of 3-aminotrifluorotoluene and 1.74g of ethylene glycol diglycidyl ether and mix them in 20mL of acetone. Add triethylamine (TEA) as an alkaline catalyst dropwise, with the amount added being 1.2% of the mass of 3-aminotrifluorotoluene. Purge nitrogen gas as a protective gas and place the mixture in a water bath at 70℃. Stir and react for 4 hours. After the reaction is complete, remove the solvent under reduced pressure to obtain the rust inhibitor.

[0051] The preparation method of the above-mentioned environmentally friendly magnesium alloy working fluid includes the following steps:

[0052] Step 1: Heat the base oil to 50°C, add rust inhibitor and corrosion inhibitor, and stir for 10 hours until a homogeneous oil phase is formed;

[0053] Step 2: Add emulsifier and wetting agent to deionized water, maintain the temperature at 40°C and stir thoroughly to obtain a homogeneous aqueous phase;

[0054] Step 3: Slowly add the oil phase to the aqueous phase (at a rate of 200 r / min), then shear at a high speed of 3000 r / min for 10 min, maintaining the temperature at 55°C throughout, to obtain the mixture;

[0055] Step 4: Reduce the stirring speed of the above mixture to 400 r / min, then add defoamer and pH adjuster, stir evenly, cool to room temperature, and let stand for 24 hours to mature, and then obtain magnesium alloy processing fluid.

[0056] Example 3

[0057] An environmentally friendly magnesium alloy processing fluid, comprising, by weight:

[0058] 7 parts base oil, 11 parts rust inhibitor, 0.9 parts corrosion inhibitor, 15 parts emulsifier, 0.12 parts defoamer, 3 parts wetting agent, 1.5 parts pH adjuster and 28 parts deionized water.

[0059] The base oil is isooctyl palmitate; the corrosion inhibitor is triethanolamine borate (TEAB); the emulsifier is an EO-PO block copolymer with an EO / PO molar ratio of 30:70 and a molecular weight of 2100; the defoamer is polyether-type defoamer TEGO Foamex 815N; the wetting agent is fatty alcohol polyoxyethylene ether AEO-7; and the pH adjuster is diethanolamine.

[0060] The preparation methods for rust inhibitors include:

[0061] Weigh 3.3g of 3-aminotrifluorotoluene and 1.74g of ethylene glycol diglycidyl ether and mix them in 30mL of acetonitrile. Add triethylamine (TEA) as an alkaline catalyst dropwise, with the amount added being 1.6% of the mass of 3-aminotrifluorotoluene. Purge nitrogen gas as a protective gas and place the mixture in a water bath at 80℃. Stir and react for 5 hours. After the reaction is complete, remove the solvent under reduced pressure to obtain the rust inhibitor.

[0062] The preparation method of the above-mentioned environmentally friendly magnesium alloy working fluid includes the following steps:

[0063] Step 1: Heat the base oil to 50°C, add rust inhibitor and corrosion inhibitor, and stir for 20 hours until a homogeneous oil phase is formed;

[0064] Step 2: Add emulsifier and wetting agent to deionized water, maintain the temperature at 40°C and stir thoroughly to obtain a homogeneous aqueous phase;

[0065] Step 3: Slowly add the oil phase to the aqueous phase (at a rate of 200 r / min), then shear at a high speed of 4000 r / min for 30 min, maintaining the temperature at 60°C throughout, to obtain a mixture;

[0066] Step 4: Reduce the stirring speed of the above mixture to 500 r / min, then add defoamer and pH adjuster, stir evenly, cool to room temperature, and let stand for 24 hours to mature, and then obtain magnesium alloy processing fluid.

[0067] Example 4

[0068] An environmentally friendly magnesium alloy processing fluid, comprising, by weight:

[0069] 10 parts base oil, 15 parts rust inhibitor, 2 parts corrosion inhibitor, 20 parts emulsifier, 0.2 parts defoamer, 4 parts wetting agent, 2 parts pH adjuster and 30 parts deionized water.

[0070] The base oil is sunflower seed oil glyceride; the corrosion inhibitor is methylbenzotriazole (TTA); the emulsifier is EO-PO block copolymer, wherein the molar ratio of EO / PO is 50:50 and the molecular weight is 2500; the defoamer is polyether-type defoamer TEGOAirex 901W; the wetting agent is fatty alcohol polyoxyethylene ether AEO-9; and the pH adjuster is triethanolamine.

[0071] The preparation methods for rust inhibitors include:

[0072] Weigh 3.5g of 3-aminotrifluorotoluene and 1.74g of ethylene glycol diglycidyl ether and mix them in 40mL of N,N-dimethylformamide. Add triethylamine (TEA) dropwise as an alkaline catalyst, the amount of which is 2.4% of the mass of 3-aminotrifluorotoluene. Purge nitrogen gas as a protective gas and place the mixture in a water bath at 100℃. Stir and react for 8 hours. After the reaction is complete, remove the solvent under reduced pressure to obtain the rust inhibitor.

[0073] The preparation method of the above-mentioned environmentally friendly magnesium alloy working fluid includes the following steps:

[0074] Step 1: Heat the base oil to 60°C, add rust inhibitor and corrosion inhibitor, and stir for 20 hours until a homogeneous oil phase is formed;

[0075] Step 2: Add emulsifier and wetting agent to deionized water, maintain the temperature at 50°C and stir thoroughly to obtain a homogeneous aqueous phase;

[0076] Step 3: Slowly add the oil phase to the aqueous phase (at a rate of 200 r / min), then shear at a high speed of 5000 r / min for 30 min, maintaining the temperature at 60°C throughout, to obtain the mixture;

[0077] Step 4: Reduce the stirring speed of the above mixture to 500 r / min, then add defoamer and pH adjuster, stir evenly, cool to room temperature, and let stand for 24 hours to mature, and then obtain magnesium alloy processing fluid.

[0078] Comparative Example 1

[0079] An environmentally friendly magnesium alloy processing fluid differs from Example 1 in that the rust inhibitor is replaced with traditional triethanolamine phosphate, while other components remain unchanged. It comprises, by weight, the following:

[0080] 8 parts base oil, 10 parts rust inhibitor, 1.2 parts corrosion inhibitor, 15 parts emulsifier, 0.1 parts defoamer, 3 parts wetting agent, 1.3 parts pH adjuster and 26 parts deionized water.

[0081] The base oil is trimethylolpropane trioleate, with a kinematic viscosity of 46-50 mmHg at 40°C. 2 / s, iodine value 85-100gI2 / 100g, acid value ≤1.8mg KOH / g; the corrosion inhibitor is triethanolamine borate (TEAB); the emulsifier is EO-PO block copolymer, wherein the molar ratio of EO / PO is 30:70 and the molecular weight is 2100; the defoamer is polyether-type defoamer TEGOFoamex815N; the wetting agent is fatty alcohol polyoxyethylene ether AEO-7; the pH adjuster is AMP-95.

[0082] Comparative Example 2

[0083] An environmentally friendly magnesium alloy processing fluid differs from Example 1 in that the rust inhibitor is replaced with ethylene glycol diglycidyl ether, while other components remain unchanged. It comprises, by weight, the following:

[0084] 8 parts base oil, 10 parts rust inhibitor, 1.2 parts corrosion inhibitor, 15 parts emulsifier, 0.1 parts defoamer, 3 parts wetting agent, 1.3 parts pH adjuster and 26 parts deionized water.

[0085] The base oil is trimethylolpropane trioleate, with a kinematic viscosity of 46-50 mmHg at 40°C. 2 / s, iodine value 85-100gI2 / 100g, acid value ≤1.8mg KOH / g; the corrosion inhibitor is triethanolamine borate (TEAB); the emulsifier is EO-PO block copolymer, wherein the molar ratio of EO / PO is 30:70 and the molecular weight is 2100; the defoamer is polyether-type defoamer TEGOFoamex815N; the wetting agent is fatty alcohol polyoxyethylene ether AEO-7; the pH adjuster is AMP-95.

[0086] The performance of the aqueous magnesium alloy processing fluids prepared in Example 1 and Comparative Examples 1-2 was tested, and the results are shown in Table 1 below:

[0087] Table 1 Performance characteristics of different magnesium alloy working fluids

[0088]

[0089] As can be seen from the table above, the magnesium alloy processing fluid prepared in Example 1 of this invention, by adding a rust inhibitor containing a "fluorocarbon-epoxy" dual-active structure, exhibits superior rust prevention, hard water resistance, lubricity, thermal stability, flame retardancy, and service life compared to traditional magnesium alloy processing fluids. The magnesium alloy processing fluid prepared in Example 1 of this invention has reached an advanced level in the industry in terms of environmental friendliness, rust prevention, safety, and durability.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0091] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An environmentally friendly magnesium alloy processing fluid, characterized in that, Calculated by weight, including: 5-10 parts base oil, 5-15 parts rust inhibitor, 0.1-2 parts corrosion inhibitor, 10-20 parts emulsifier, 0.05-0.2 parts defoamer, 2-4 parts wetting agent, 1-2 parts pH adjuster and 15-30 parts deionized water; The rust inhibitor is a product prepared by a ring-opening reaction using 3-aminotrifluorotoluene and ethylene glycol diglycidyl ether as reactants. The method for preparing the rust inhibitor includes: Weigh 3-aminotrifluorotoluene and ethylene glycol diglycidyl ether and mix them in an organic solvent. Add an alkaline catalyst dropwise, purge with nitrogen as a protective gas, and place in a water bath at 70-100℃. Stir and react for 4-8 hours. After the reaction is complete, remove the solvent under reduced pressure to obtain the rust inhibitor. The solvent is at least one selected from tetrahydrofuran, acetone, acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide, and N,N-dimethylacetamide; the mass-volume ratio of 3-aminotrifluorotoluene, ethylene glycol diglycidyl ether, and the organic solvent is (3.1-3.5) g:1.74 g:(20-40) mL; the catalyst is triethylamine, and the amount added is 1.2%-2.4% of the mass of 3-aminotrifluorotoluene.

2. The environmentally friendly magnesium alloy processing fluid according to claim 1, characterized in that, The base oil is at least one of trimethylolpropane trioleate, isooctyl palmitate, and sunflower seed oil glycerides.

3. The environmentally friendly magnesium alloy processing fluid according to claim 1, characterized in that, The corrosion inhibitor is at least one of benzotriazole, methylbenzotriazole, and triethanolamine borate.

4. The environmentally friendly magnesium alloy processing fluid according to claim 1, characterized in that, The emulsifier is an EO-PO block copolymer, wherein the molar ratio of EO to PO is 30-50:50-70, and the molecular weight is 1800-2500.

5. The environmentally friendly magnesium alloy processing fluid according to claim 1, characterized in that, The defoamer is a polyether-type defoamer, including at least one of TEGO Foamex 815N, TEGO Foamex 825, and TEGO Airex 901W.

6. The environmentally friendly magnesium alloy processing fluid according to claim 1, characterized in that, The wetting agent is a fatty alcohol polyoxyethylene ether, including one of AEO-3, AEO-7, AEO-9, and AEO-15.

7. The environmentally friendly magnesium alloy processing fluid according to claim 1, characterized in that, The pH adjuster is at least one of ethanolamine, diethanolamine, triethanolamine, and AMP-95.

8. A method for preparing an environmentally friendly magnesium alloy working fluid according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Heat the base oil to 50-60℃, add rust inhibitor and corrosion inhibitor, and stir for 10-20 hours until a homogeneous oil phase is formed; Step 2: Add emulsifier and wetting agent to deionized water, maintain the temperature at 40-50℃ and stir thoroughly to obtain a homogeneous aqueous phase; Step 3: Slowly add the oil phase to the aqueous phase, then shear at a high speed of 3000-5000 r / min for 10-30 min, maintaining the temperature at 55-60℃ throughout the process, to obtain the mixture; Step 4: Reduce the stirring speed of the above mixture to 400-500 r / min, add defoamer and pH adjuster, stir evenly, cool to room temperature, and let stand for 24 hours to mature, and then obtain magnesium alloy processing fluid.

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