Magnesium alloy cutting fluid and preparation method thereof

Abstract

The application belongs to the field of metal processing, and discloses a magnesium alloy cutting fluid and a preparation method thereof, which is composed of the following components in percentage by mass: compounded extreme pressure lubricant 3-7%, compounded antirust agent 3-8%, compounded aluminum-magnesium alloy corrosion inhibitor 5-10%, bactericide 2-3%, pH regulator 10-12%, defoaming agent 0.2-0.4%, hard water resisting agent 1-3%, and deionized water as the balance. The magnesium alloy cutting fluid has excellent corrosion resistance and lubricity, overcomes the corrosion and hydrogen evolution problems caused by the reaction with water in the magnesium alloy processing process, and can be used in the field of automobile magnesium alloy processing and manufacturing to effectively improve the surface quality of the processed workpiece.

Description

Technical Field

[0001] This invention belongs to the field of metal processing, specifically relating to a magnesium alloy cutting fluid and its preparation method. Background Technology

[0002] Magnesium alloys have the characteristics of low density, high strength, high elastic modulus, easy heat dissipation, impact resistance, excellent electromagnetic shielding performance, good damping performance, and low biological toxicity, making them suitable for electrode materials, aerospace, automobile manufacturing, biomedicine and other fields.

[0003] Magnesium has a standard electrode potential of -2.37V. Its high electronegativity means that magnesium will corrode even in the absence of oxygen, resulting in poor corrosion resistance of magnesium alloys in applications. In humid atmospheric environments, the magnesium alloy surface undergoes sequential processes of water adsorption, loose MgO formation, and MgO crystal layer coverage. The chemisorption of water on MgO(111) facilitates proton decomposition, forming OH-. - and H + This leads to the hydroxylation of MgO to form Mg(OH)2. MgO has a higher solubility in water than Mg(OH)2. In a humid atmospheric environment, MgO is converted to Mg(OH)2. The precipitation of Mg(OH)2 reduces the thickness of the MgO layer, making the film on the substrate surface less dense, thereby aggravating the corrosion of the substrate.

[0004] The final corrosion products of magnesium alloys in acidic, alkaline, and neutral humid atmospheric environments are mainly Mg(OH)₂ and MgO. The pH of the environment has a significant impact on the corrosion rate of magnesium alloys. According to the E-pH diagram of the Mg-OH system: when the pH is greater than 10, the Mg(OH)₂ on the magnesium alloy surface is stable, and the corrosion resistance is good; when the pH is in the range of 8.5–11, a Mg(OH)₂ or MgO film will form on the magnesium alloy surface; when the pH is less than 7, H₂… + It will react with Mg(OH)2 on the surface of magnesium alloy, causing the substrate to come into direct contact with the corrosive medium and thus accelerating corrosion.

[0005] During machining of magnesium alloys, the oxide film formed on the surface by the alloy itself cannot provide effective protection. At the same time, various factors such as high temperature, water, surface impurities, and anodic dissolution areas during the machining process can greatly accelerate the corrosion rate.

[0006] Currently available magnesium alloy cutting fluids generally suffer from drawbacks such as insufficient lubrication, weak corrosion inhibition, high mineral oil content, and high price. Therefore, the research and development of fully synthetic magnesium alloy cutting fluids has profound strategic significance and long-term economic benefits for improving the technical level of cutting fluids in my country and replacing foreign products. Summary of the Invention

[0007] The purpose of this invention is to provide a magnesium alloy cutting fluid that overcomes the shortcomings of existing magnesium alloy cutting fluids, such as insufficient lubrication performance, weak corrosion inhibition performance, high mineral oil content, and high price.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A magnesium alloy cutting fluid comprises the following components by mass percentage: 3%–7% compound extreme pressure lubricant, 3%–8% compound rust inhibitor, 5%–10% compound aluminum-magnesium alloy corrosion inhibitor, 2%–3% bactericide, 10%–12% pH adjuster, 0.2%–0.4% defoamer, 1%–3% anti-hard water agent, and the balance being deionized water.

[0010] Preferably, the compound extreme pressure lubricant is composed of triethanolamine borate and polyethylene glycol 400 mixed at a mass ratio of 1:3.

[0011] Preferably, the compound rust inhibitor is composed of organosiloxane, sodium petroleum sulfonate and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:1:3.

[0012] Preferably, the compound aluminum-magnesium alloy corrosion inhibitor is composed of 2-amino-2-methyl-1-propanol and fatty alcohol ethoxylated phosphate in a mass ratio of 1:1.

[0013] Preferably, the bactericide is sodium benzoate.

[0014] Preferably, the pH adjuster is triethanolamine.

[0015] Preferably, the defoamer is polyether.

[0016] Preferably, the anti-hard water agent is fatty alcohol polyoxyethylene ether carboxylic acid.

[0017] The preparation method of the magnesium alloy cutting fluid of the present invention includes the following steps: adding compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor and bactericide sequentially to deionized water, mixing and stirring evenly, heating and maintaining the temperature at 45℃±2℃ to make the solution clear and transparent, then adding defoamer and anti-hard water agent, and finally adding pH adjuster to adjust the overall pH value of the solution to 8.0~9.0, and continuing to stir until the solution is clear and transparent, thus obtaining the magnesium alloy fully synthetic cutting fluid.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The magnesium alloy cutting fluid of the present invention has excellent corrosion resistance and lubricity, overcomes the problems of corrosion and hydrogen evolution caused by the reaction with water during magnesium alloy processing, and can be used in the field of automotive magnesium alloy processing and manufacturing to effectively improve the surface quality of processed workpieces.

[0020] Specific implementation methods

[0021] The preferred embodiments of the present invention will now be described in detail with reference to specific examples. It should be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art can make various modifications and substitutions to the present invention without departing from its spirit and essence.

[0022] Unless otherwise specified, all materials and reagents used in the following embodiments are commercially available.

[0023] Example 1

[0024] This embodiment provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0025] The preparation steps of the magnesium alloy cutting fluid in this embodiment are as follows: Add the compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add the defoamer and anti-hard water agent, and finally add the pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0026] Example 2

[0027] This embodiment provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 2.5%, fatty alcohol ethoxylated phosphate 2.5%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 69.2%.

[0028] The preparation steps of the magnesium alloy cutting fluid in this embodiment are as follows: Add the compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add the defoamer and anti-hard water agent, and finally add the pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0029] Example 3

[0030] This embodiment provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 5%, fatty alcohol ethoxylated phosphate 5%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 64.2%.

[0031] The preparation steps of the magnesium alloy cutting fluid in this embodiment are as follows: Add the compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add the defoamer and anti-hard water agent, and finally add the pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0032] Example 4

[0033] This embodiment provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 0.75%, polyethylene glycol 400 2.25%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 68.2%.

[0034] The preparation steps of the magnesium alloy cutting fluid in this embodiment are as follows: Add the compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add the defoamer and anti-hard water agent, and finally add the pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0035] Example 5

[0036] This embodiment provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.75%, polyethylene glycol 400 5.25%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 64.2%.

[0037] The preparation steps of the magnesium alloy cutting fluid in this embodiment are as follows: Add the compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add the defoamer and anti-hard water agent, and finally add the pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0038] Example 6

[0039] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 0.6%, sodium petroleum sulfonate 0.6%, fatty alcohol polyoxyethylene ether phosphate 1.8%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 68.2%.

[0040] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0041] Example 7

[0042] This embodiment provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1.6%, sodium petroleum sulfonate 1.6%, fatty alcohol polyoxyethylene ether phosphate 4.8%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 63.2%.

[0043] The preparation steps of the magnesium alloy cutting fluid in this embodiment are as follows: Add the compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add the defoamer and anti-hard water agent, and finally add the pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0044] Comparative Example 1

[0045] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 2%, fatty alcohol ethoxylated phosphate 2%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 70.2%.

[0046] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0047] Comparative Example 2

[0048] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 5.5%, fatty alcohol ethoxylated phosphate 5.5%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 63.2%.

[0049] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0050] Comparative Example 3

[0051] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 8%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0052] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0053] Comparative Example 4

[0054] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, fatty alcohol ethoxylated phosphate 8%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0055] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0056] Comparative Example 5

[0057] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 2.6%, fatty alcohol ethoxylated phosphate 5.4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0058] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0059] Comparative Example 6

[0060] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 5.4%, fatty alcohol ethoxylated phosphate 2.6%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0061] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0062] Comparative Example 7

[0063] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 0.5%, polyethylene glycol 400 1.5%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 69.2%.

[0064] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0065] Comparative Example 8

[0066] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 2%, polyethylene glycol 400 6%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 63.2%.

[0067] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0068] Comparative Example 9

[0069] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: 5% triethanolamine borate, 1% organosiloxane, 1% sodium petroleum sulfonate, 3% fatty alcohol polyoxyethylene ether phosphate, 4% 2-amino-2-methyl-1-propanol, 4% fatty alcohol ethoxylated phosphate, 2.5% sodium benzoate, 11% triethanolamine, 0.3% polyether, 2% fatty alcohol polyoxyethylene ether carboxylic acid, and 66.2% deionized water.

[0070] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0071] Comparative Example 10

[0072] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: polyethylene glycol 4005%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0073] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0074] Comparative Example 11

[0075] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.6%, polyethylene glycol 400 3.4%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0076] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0077] Comparative Example 12

[0078] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1%, polyethylene glycol 400 4%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0079] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0080] Comparative Example 13

[0081] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 0.4%, sodium petroleum sulfonate 0.4%, fatty alcohol polyoxyethylene ether phosphate 1.2%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 69.2%.

[0082] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0083] Comparative Example 14

[0084] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1.8%, sodium petroleum sulfonate 1.8%, fatty alcohol polyoxyethylene ether phosphate 5.4%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 62.2%.

[0085] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0086] Comparative Example 15

[0087] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 5%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0088] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0089] Comparative Example 16

[0090] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, sodium petroleum sulfonate 5%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0091] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0092] Comparative Example 17

[0093] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, fatty alcohol polyoxyethylene ether phosphate 5%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0094] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0095] Comparative Example 18

[0096] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 2.5%, sodium petroleum sulfonate 1.25%, fatty alcohol polyoxyethylene ether phosphate 1.25%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0097] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0098] Comparative Example 19

[0099] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1.25%, sodium petroleum sulfonate 2.5%, fatty alcohol polyoxyethylene ether phosphate 1.25%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0100] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0101] Comparative Example 20

[0102] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1.25%, sodium petroleum sulfonate 1.25%, fatty alcohol polyoxyethylene ether phosphate 2.5%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0103] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0104] Comparative Example 21

[0105] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 3%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 1%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0106] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0107] Comparative Example 22

[0108] This comparative example provides a magnesium alloy cutting fluid, the composition of which by mass percentage is as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 3%, fatty alcohol polyoxyethylene ether phosphate 1%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0109] The preparation steps of this comparative magnesium alloy cutting fluid are as follows: Add compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide to deionized water in sequence, mix and stir evenly, heat and maintain the temperature at 45℃±2℃ to make the solution clear and transparent, then add defoamer and anti-hard water agent, and finally add pH adjuster to adjust the overall pH value of the solution to 8.5, and continue stirring until the solution is clear and transparent to obtain the magnesium alloy fully synthetic cutting fluid.

[0110] Conclusion: After multiple comparative experiments, the optimal component ratio of magnesium alloy cutting fluid was obtained as follows: triethanolamine borate 1.25%, polyethylene glycol 400 3.75%, organosiloxane 1%, sodium petroleum sulfonate 1%, fatty alcohol polyoxyethylene ether phosphate 3%, 2-amino-2-methyl-1-propanol 4%, fatty alcohol ethoxylated phosphate 4%, sodium benzoate 2.5%, triethanolamine 11%, polyether 0.3%, fatty alcohol polyoxyethylene ether carboxylic acid 2%, and deionized water 66.2%.

[0111] The methods for testing the performance of magnesium alloy cutting fluids obtained in the above embodiments and comparative examples are as follows:

[0112] Corrosion inhibition performance testing method: According to section 5.6 of GB / T 6144-2010 Test Method for Synthetic Cutting Fluids, corrosion test, a 5% concentration of the test magnesium alloy cutting fluid was placed in five beakers. Five groups of treated magnesium alloy test pieces (AZ31B, AZ80A, ZK60A, AM60B, and AZ91D) were then slowly placed into different beakers. Glass lids were then placed on the beakers, and the temperature was raised to 55℃±2℃. The samples were then immersed at this constant temperature for 8 hours and the surface condition of the test pieces was observed. The results are shown in Table 1.

[0113] Rust prevention performance testing method: According to section 5.6 of GB / T 6144-2010 Test Method for Synthetic Cutting Fluids, corrosion test, a 5% concentration of magnesium alloy cutting fluid was placed in a beaker, and then the treated cast iron sheets were slowly placed into different beakers. The beakers were then covered with glass lids, heated to 55℃±2℃, and immersed at this constant temperature for 24 hours. The surface condition of the test pieces was then observed. The rust prevention performance of single and stacked sheets was tested according to section 5.7 of GB / T 6144-2010 Test Method for Synthetic Cutting Fluids. The results are shown in Table 2.

[0114] Lubrication performance testing method: The lubricity of magnesium alloy cutting fluid was tested using a BOOST-BSV05 tapping torque meter to obtain tapping torque test data. The results are shown in Table 3.

[0115] Table 1 Comparison of Corrosion Inhibition Performance of Magnesium Alloy Cutting Fluids (Test Results)

[0116] Example 1 Grade A Grade A Grade A Grade A Grade A Example 2 Grade A Grade A Grade A Grade A Grade A Example 3 Grade A Grade A Grade A Grade A Grade A Comparative Example 1 Grade B Grade A Grade B Class C Grade B Comparative Example 2 Class C Class C Grade A Grade B Grade B Comparative Example 3 Class D Class D Class D Grade B Grade A Comparative Example 4 Grade A Grade B Class D Class D Class C Comparative Example 5 Class C Grade A Grade B Grade A Grade A Comparative Example 6 Grade A Grade B Grade A Grade A Grade B

[0117] As shown in Table 1, the compound aluminum-magnesium alloy corrosion inhibitor in the magnesium alloy cutting fluid provided by the present invention, when the effective concentration range (mass fraction) is 5% to 10%, and 2-amino-2-methyl-1-propanol and fatty alcohol ethoxylated phosphate are mixed in a mass ratio of 1:1, has a significant corrosion inhibition effect on the magnesium alloy surface, thereby greatly improving the corrosion resistance of magnesium alloy in cutting.

[0118] Table 2 Comparison Test Results of Machining and Rust Prevention Performance of Magnesium Alloys

[0119] Example 1 Grade A Grade A Grade A No rust, no obvious overprinting Example 6 Grade A Grade A Grade A No rust, no obvious overprinting Example 7 Grade A Grade A Grade A No rust, no obvious overprinting Comparative Example 13 Class D class Class C Obvious rust, obvious overprinting Comparative Example 14 Class C Class C Class C Obvious rust, obvious overprinting Comparative Example 15 Class D Class D Class D Severe corrosion, obvious overprinting Comparative Example 16 Class D Class D Class D Severe corrosion, obvious overprinting Comparative Example 17 Class D Class C Class C Obvious rust, obvious overprinting Comparative Example 18 Grade B Class C Class C Slight rust, obvious overprinting Comparative Example 19 Grade B Grade B Grade B Slight rust, obvious overprinting Comparative Example 20 Grade B Class C Class C Obvious rust, obvious overprinting Comparative Example 21 Grade B Grade B Grade B Slight rust, obvious overprinting Comparative Example 22 Grade B Grade A Grade A Slight rust, obvious overprinting

[0120] As shown in Table 2, the compound rust inhibitor in the magnesium alloy cutting fluid provided by the present invention, when the effective concentration range (mass fraction) is 3% to 8%, and the mixture of organosiloxane, sodium petroleum sulfonate and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:1:3, has a significant anti-corrosion effect on cast iron, thereby protecting machine tools during cutting.

[0121] Table 3 Comparison of tapping torque test results for magnesium alloy cutting fluid

[0122]

[0123] As shown in Table 3, the average torque obtained during the tapping torque test of the compound extreme pressure lubricant in the magnesium alloy cutting fluid provided by the present invention is relatively small when the effective concentration range (mass fraction) is 3% to 7% and the triethanolamine borate and polyethylene glycol 400 are mixed at a mass ratio of 1:3. The lubricity is good, and the compound extreme pressure lubricant can improve its lubricity.

[0124] It should be noted that the above embodiments are only for explaining the present invention and do not constitute any limitation on the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory terms, not limiting terms. Modifications can be made to the present invention within the scope of the claims, and revisions can be made to the present invention without departing from the scope and spirit of the present invention. Although the present invention described herein relates to specific methods, materials, and embodiments, it does not mean that the present invention is limited to the specific examples disclosed herein; on the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A magnesium alloy cutting fluid, characterized in that, The product is composed of the following components by weight percentage: 3%~7% compound extreme pressure lubricant, 3%~8% compound rust inhibitor, 5%~10% compound aluminum-magnesium alloy corrosion inhibitor, 2%~3% bactericide, 10%~12% pH adjuster, 0.2%~0.4% defoamer, 1%~3% anti-hard water agent, and the balance being deionized water. The compound extreme pressure lubricant is composed of triethanolamine borate and polyethylene glycol 400 in a mass ratio of 1:3; the compound rust inhibitor is composed of organosiloxane, sodium petroleum sulfonate and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 1:1:3; the compound aluminum-magnesium alloy corrosion inhibitor is composed of 2-amino-2-methyl-1-propanol and fatty alcohol ethoxylated phosphate in a mass ratio of 1:

1.

2. The magnesium alloy cutting fluid according to claim 1, characterized in that, The bactericide is sodium benzoate.

3. The magnesium alloy cutting fluid according to claim 1, characterized in that, The pH adjuster is triethanolamine.

4. The magnesium alloy cutting fluid according to claim 1, characterized in that, The defoamer is polyether.

5. The magnesium alloy cutting fluid according to claim 1, characterized in that, The anti-hard water agent is fatty alcohol polyoxyethylene ether carboxylic acid.

6. A method for preparing the magnesium alloy cutting fluid according to any one of claims 1 to 5, characterized in that, The process includes the following steps: adding compound extreme pressure lubricant, compound rust inhibitor, compound aluminum-magnesium alloy corrosion inhibitor, and bactericide sequentially to deionized water, mixing and stirring until homogeneous, heating and maintaining the temperature at 45℃±2℃ to make the solution clear and transparent, then adding defoamer and anti-hard water agent, and finally adding pH adjuster to adjust the overall pH value of the solution to 8.0~9.0, and continuing to stir until the solution is clear and transparent, thus obtaining magnesium alloy cutting fluid.

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