Rust-proof water-soluble quenching medium and preparation method thereof
By adding rust inhibitors and alkaline retainers to water-soluble quenching media, a passivation protective film is formed, which solves the problem of insufficient rust prevention performance of water-soluble quenching media and achieves better rust prevention effect and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIHUA LAB
- Filing Date
- 2023-11-27
- Publication Date
- 2026-07-21
AI Technical Summary
Existing water-soluble quenching media have insufficient rust prevention performance on workpieces after quenching, while oil-based quenching media have problems with environmental pollution and insufficient cooling capacity.
It uses a rust-preventive water-soluble quenching medium containing water, cooling rate regulator, defoamer, rust inhibitor, alkaline retainer, and potassium hydroxide, etc., which forms a multi-layer passivation protective film to isolate the metal from air and moisture and improve rust prevention performance.
It forms multiple passivation layers on the surface of metal workpieces, slows down oxidation and corrosion, provides excellent rust prevention performance, and maintains good results when diluted to a low concentration, thus reducing production costs.
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Figure CN117683975B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of quenching media technology, and in particular to a rust-preventive water-soluble quenching media and its preparation method. Background Technology
[0002] Quenching refers to the process of rapidly cooling a workpiece after it has been heated to a high temperature in a cooling medium. This causes the supercooled austenite to transform into martensite or bainite, resulting in a martensitic or bainitic structure and achieving the desired hardness. There are many types of quenching media, mainly divided into two categories: water-soluble quenching media and oil-based quenching media. Oil-based quenching media have become relatively mature and widely used in recent decades. However, while they are beneficial in reducing workpiece deformation and cracking, they have low cooling capacity in high-temperature zones, poor hardenability, and fail to harden larger workpieces properly. Furthermore, the resulting fumes and dust severely pollute the environment and can easily cause fires. With increasingly stringent national requirements for green environmental protection, there is growing attention to water-soluble quenching media, which are also relatively cheaper.
[0003] Existing technologies (such as CN115505699A and CN103484625A) effectively solve problems such as cracking and poor mechanical properties of workpieces after quenching using water-soluble quenching media, but they do not focus on the rust prevention performance of the workpieces after quenching. Some patents have reported on the rust prevention performance of quenched workpieces, mainly by adding some oleophilic and hydrophilic organic compounds and inorganic salts to the water, which often results in poor rust prevention performance; or by adding carcinogenic or teratogenic components such as nitrites or nitrates for rust prevention. Summary of the Invention
[0004] The main objective of this invention is to provide a rust-resistant water-soluble quenching medium, which aims to improve the rust resistance of quenched workpieces.
[0005] The present invention provides a rust-preventive water-soluble quenching medium, which comprises the following components by mass percentage: water 30%-60%, cooling rate regulator 35%-55%, rust inhibitor 0.01%-6%, defoamer 0.01%-0.05%, alkalinity retainer 0.1%-8%, and potassium hydroxide 2.2%-8%.
[0006] In one embodiment, the rust-preventive water-soluble quenching medium comprises, by mass percentage, the following components: water 30%-55%, cooling rate regulator 40%-50%, rust inhibitor 0.05%-5%, defoamer 0.01%-0.03%, alkalinity retainer 0.2%-6%, and potassium hydroxide 2.5%-6%.
[0007] The present invention also provides a rust-preventive water-soluble quenching medium, wherein the rust-preventive water-soluble quenching medium comprises the following components by mass percentage: water 40%-50%, cooling rate regulator 40%-50%, defoamer 0.01%-0.03%, potassium hydroxide 2.5%-3.5%, benzotriazole 0.03%-0.08%, mixed dicarboxylic acid 3.5%-4.5%, monoethanolamine 0.5%-1.5%, diethylethanolamine 0.5%-1.5%, and triethanolamine 2.5%-3.5%.
[0008] In one embodiment, the cooling rate regulator is a polyether.
[0009] In one embodiment, the cooling rate regulator is polyether 55000.
[0010] In one embodiment, the defoamer is a siloxane.
[0011] The present invention also provides a rust-preventive water-soluble quenching medium, wherein the rust-preventive water-soluble quenching medium comprises the following components by mass percentage: water 40%-50%, cooling rate regulator 40%-50%, defoamer 0.01%-0.03%, potassium hydroxide 2.5%-5.5%, rust inhibitor 2%-5%, and alkalinity retainer 0.1%-5%.
[0012] In one embodiment, the rust inhibitor is a mixture of benzotriazole and mixed dicarboxylic acids.
[0013] In one embodiment, the alkalinity retainer is at least one of monoethanolamine, diethylethanolamine, and triethanolamine.
[0014] This invention also provides a method for preparing a rust-preventive water-soluble quenching medium, comprising the following steps:
[0015] Step 1: Add water to the reactor, turn on the heating, and raise the temperature to 55±5℃;
[0016] Step 2: Add rust inhibitor, alkaline retainer and potassium hydroxide in sequence, and start stirring;
[0017] Step 3: After stirring for at least 30 minutes, add the cooling rate regulator and defoamer, and continue to circulate and stir for 1 hour to obtain the rust-preventive water-soluble quenching medium.
[0018] The rust-preventive water-soluble quenching medium proposed in this invention can form a multi-layer passivation protective film on the surface of metal workpieces, isolating them from air and moisture in the atmosphere. This reduces the activity of the metal and slows down the oxidation and corrosion rate, resulting in a longer-lasting and more effective rust prevention effect. Workpieces quenched with this rust-preventive water-soluble quenching medium exhibit excellent rust prevention performance. Even when diluted to a low concentration (5%), the rust-preventive water-soluble quenching medium maintains good rust prevention performance, effectively reducing the amount of quenching medium required for production and significantly lowering production costs. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 5% in Comparative Example 1 of this invention.
[0021] Figure 2 This is a schematic diagram of the rust prevention performance test results of cast iron chips at a concentration of 10% in Comparative Example 1 of this invention.
[0022] Figure 3 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 15% in Comparative Example 1 of this invention.
[0023] Figure 4 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 5% in Example 1 of this invention;
[0024] Figure 5 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 10% in Example 1 of this invention;
[0025] Figure 6 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 15% in Example 1 of this invention;
[0026] Figure 7 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 5% in Comparative Example 2 of this invention.
[0027] Figure 8 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 10% in Comparative Example 2 of this invention.
[0028] Figure 9 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 15% in Comparative Example 2 of this invention.
[0029] Figure 10 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 5% in Example 2 of this invention;
[0030] Figure 11 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 10% in Example 2 of this invention;
[0031] Figure 12 This is a schematic diagram showing the test results of the rust prevention performance of cast iron chips at a concentration of 15% in Example 2 of this invention;
[0032] Figure 13 The cooling rate characteristic curves of Examples 1 and 2 of this invention at a concentration of 5%.
[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0035] This invention proposes a rust-preventive water-soluble quenching medium, which comprises the following components by mass percentage: water 30%-60%, cooling rate regulator 35%-55%, rust inhibitor 0.01%-6%, defoamer 0.01%-0.05%, alkalinity retainer 0.1%-8%, and potassium hydroxide 2.2%-8%.
[0036] In one embodiment, the rust-preventive water-soluble quenching medium comprises, by mass percentage, the following components: 30%-55% water, 40%-50% cooling rate regulator, 0.05%-5% rust inhibitor, 0.01%-0.03% defoamer, 0.2%-6% alkalinity retainer, and 2.5%-6% potassium hydroxide.
[0037] The present invention also provides a rust-preventive water-soluble quenching medium, which comprises the following components by mass percentage: water 40%-50%, cooling rate regulator 40%-50%, defoamer 0.01%-0.03%, potassium hydroxide 2.5%-3.5%, benzotriazole 0.03%-0.08%, mixed dicarboxylic acid 3.5%-4.5%, monoethanolamine 0.5%-1.5%, diethylethanolamine 0.5%-1.5%, and triethanolamine 2.5%-3.5%.
[0038] In one embodiment, the cooling rate regulator is a polyether.
[0039] In one embodiment, the cooling rate regulator is polyether 55000.
[0040] In one embodiment, the defoamer is a siloxane.
[0041] The present invention also provides a rust-preventive water-soluble quenching medium, which comprises the following components by mass percentage: water 40%-50%, cooling rate regulator 40%-50%, defoamer 0.01%-0.03%, potassium hydroxide 2.5%-5.5%, rust inhibitor 2%-5%, and alkalinity retainer 0.1%-5%.
[0042] In one embodiment, the rust inhibitor is a mixture of benzotriazole and mixed dicarboxylic acids.
[0043] In one embodiment, the alkalinity retainer is at least one of monoethanolamine, diethylethanolamine, and triethanolamine.
[0044] As a water quality stabilizer, cooling rate regulators are more likely to cause scale formation when calcium and magnesium ion concentrations are high. However, because the cooling rate regulator is adsorbed onto the crystal surface, it hinders crystal aggregation, resulting in a loose scale layer that is easily washed away by water flow. This achieves the purpose of preventing and removing scale, with a significant scale-preventing effect. Polyether-based cooling rate regulators can be used. Polyether is a high-molecular polymer formed by the polymerization reaction of compounds containing epoxy structures and organic compounds containing active hydrogen. Specifically, water-soluble polyether 55000 can be selected. Polyether 55000 is a polymer with diol as an initiator, containing 75% by weight of ethylene oxide groups and 25% by weight of propylene oxide groups, with two terminal hydroxyl groups. Polyether 55000 is soluble in water at 75℃.
[0045] Defoamers reduce the surface tension of water, solutions, suspensions, etc., preventing foam formation or reducing or eliminating existing foam. Defoamers can prevent the formation of bubbles in rust-inhibiting water-soluble quenching media during use, thus preventing damage to stamped parts and dies. Siloxanes can be used as defoamers; FOAM BAN HP720 is a specific example.
[0046] To ensure the rust-proof performance of the quenched workpiece surface, multiple rust inhibitors need to be added in combination. However, most rust inhibitors are acidic substances (the rust inhibitor in this invention is a mixture of benzotriazole and mixed dibasic acids). Because acidic substances release H+ in aqueous solutions... + Ions, active free H+ +It reacts with metals, therefore it cannot directly prevent rust. Rust prevention generally requires neutralization with an alkaline substance to form a corresponding acid salt, which then adheres to the metal as an insoluble passivation film or reactive film, thus achieving a rust-preventive effect. The alkaline substance in this invention is a mixture of an alkaline retainer and potassium hydroxide. The alkaline retainer is one or more of monoethanolamine, triethanolamine, and diethylethanolamine. The mixed dicarboxylic acid is a mixture of aliphatic dicarboxylic acids, such as dodecanoic acid and sebacic acid.
[0047] This invention also provides a method for preparing a rust-preventive water-soluble quenching medium, comprising the following steps:
[0048] Step 1: Add water to the reactor, turn on the heating, and raise the temperature to 55±5℃;
[0049] Step 2: Add rust inhibitor, alkaline retainer and potassium hydroxide in sequence, and start stirring;
[0050] Step 3: After stirring for at least 30 minutes, add the cooling rate regulator and defoamer, and continue to circulate and stir for 1 hour to obtain the rust-preventive water-soluble quenching medium.
[0051] The raw materials used in the preparation process are as follows:
[0052] Polyether 55000: Tianjin Haoruisen Chemical Trading Co., Ltd.;
[0053] Benzotriazole (BTA): Jiangsu Chuangteng New Material Technology Co., Ltd.;
[0054] Mixed dicarboxylic acids: Shandong Kaisai Biotechnology Co., Ltd.;
[0055] Siloxane (FOAM BAN HP720): Mengqingxin Additives Co., Ltd.;
[0056] Monoethanolamine: Tianjin Xinnuowei Chemical Co., Ltd.;
[0057] Diethylethanolamine: Shanghai Gaoming Chemical Co., Ltd.;
[0058] Triethanolamine: Shanghai Junyan New Materials Technology Co., Ltd.;
[0059] Potassium hydroxide: Tianjin Yitaicheng Chemical Technology Co., Ltd., the concentration of potassium hydroxide is 45%.
[0060] The present invention will now be described in detail with reference to the embodiments.
[0061] The following components are calculated as a percentage by mass.
[0062] Comparative Example 1:
[0063] Step 1: Add 49.58% water to the reactor, turn on the heating, and raise the temperature to 55±5℃;
[0064] Step 2: Add the rust inhibitor (0.05% BTA and 1.5% mixed dicarboxylic acid), alkalinity retainer (0.27% monoethanolamine, 1% diethylethanolamine, 1.98% triethanolamine) and 1.6% potassium hydroxide in sequence, and start stirring;
[0065] Step 3: After stirring for at least 30 minutes, add the cooling rate regulator (44% polyether 55000) and defoamer (0.02% siloxane), and continue stirring for 1 hour to obtain a rust-preventive water-soluble quenching medium. The rust-preventive water-soluble quenching medium is a colorless, semi-transparent medium with a uniform appearance and moderate viscosity.
[0066] Example 1:
[0067] Step 1: Add 43.78% water to the reactor, turn on the heating, and raise the temperature to 55±5℃;
[0068] Step 2: Add the rust inhibitor (0.05% BTA and 4% mixed dicarboxylic acid), alkalinity retainer (1.27% monoethanolamine, 1% diethylethanolamine, 2.98% triethanolamine) and 2.9% potassium hydroxide in sequence, and start stirring;
[0069] Step 3: After stirring for at least 30 minutes, add the cooling rate regulator (44% polyether 55000) and defoamer (0.02% siloxane), and continue stirring for 1 hour to obtain a rust-preventive water-soluble quenching medium. The rust-preventive water-soluble quenching medium is a colorless, semi-transparent medium with a uniform appearance and moderate viscosity.
[0070] Comparative Example 2:
[0071] Step 1: Add 45.94% water to the reactor, turn on the heating, and raise the temperature to 55±5℃;
[0072] Step 2: Add the rust inhibitor (0.06% BTA and 3.5% mixed dicarboxylic acid), the alkalinity retainer (0.27% monoethanolamine, 1.3% diethylethanolamine, and 2.78% triethanolamine) and 2.13% potassium hydroxide in sequence, and start stirring;
[0073] Step 3: After stirring for at least 30 minutes, add the cooling rate regulator (44% polyether 55000) and defoamer (0.02% siloxane), and continue stirring for 1 hour to obtain a rust-preventive water-soluble quenching medium. The rust-preventive water-soluble quenching medium is a colorless, semi-transparent medium with a uniform appearance and moderate viscosity.
[0074] Example 2:
[0075] Step 1: Add 43.04% water to the reactor, turn on the heating, and raise the temperature to 55±5℃;
[0076] Step 2: Add the rust inhibitor (0.06% BTA and 3.5% mixed dicarboxylic acid), the alkalinity retainer (0.27% monoethanolamine, 1.3% diethylethanolamine, and 2.78% triethanolamine) and 5.05% potassium hydroxide in sequence, and start stirring;
[0077] Step 3: After stirring for at least 30 minutes, add the cooling rate regulator (44% polyether 55000) and defoamer (0.02% siloxane), and continue stirring for 1 hour to obtain a rust-preventive water-soluble quenching medium. The rust-preventive water-soluble quenching medium is a colorless, semi-transparent medium with a uniform appearance and moderate viscosity.
[0078] Comparative Examples 1-2 and Examples 1-2 were carried out according to each step of the preparation method of rust-preventive water-soluble quenching medium, with the only difference being the different raw material ratios, as shown in Table 1;
[0079] Table 1 - Mass percentage of each component in Comparative Examples 1-2 and Examples 1-2
[0080]
[0081]
[0082] Conductivity, pH value, and rust-preventive performance tests were conducted on various comparative examples and embodiments of the rust-preventive water-soluble quenching medium proposed in this invention. The test methods are as follows:
[0083] (1) Conductivity test method shall be carried out in accordance with Section 5 of GB11007-1989 Conductivity Meter Test Method.
[0084] (2) pH test method: The pH test method shall be carried out in accordance with Section 7 of GB6920-1986 Test Method for Determination of pH Value of Water (Glass Electrode Method).
[0085] (3) The rust prevention performance test method shall be carried out in accordance with Section 8 of JBT9189-2016 Test Method for Rust Prevention of Water-based Materials (Cast Iron Shavings Test).
[0086] The conductivity test results of Comparative Examples 1-2 and Examples 1-2 are shown in Table 2:
[0087] Table 2 - Conductivity test results of Comparative Examples 1-2 and Examples 1-2
[0088] 5％ 718 1458 1177 1786 10％ 1245 2488 2055 3069 15％ 1659 3294 2727 3991
[0089] The pH test results of Comparative Examples 1-2 and Examples 1-2 are shown in Table 3:
[0090] Table 3 - pH value test results of Comparative Examples 1-2 and Examples 1-2
[0091] 5％ 10.38 9.62 9.01 10.46 10％ 10.43 9.69 9.03 10.50 15％ 10.46 9.77 9.05 10.52
[0092] Based on the conductivity test results in Table 2, the pH value test results in Table 3, and... Figures 1-12 It is known that the rust-preventive performance of cast iron chips is related to the pH value of the rust-preventive water-soluble quenching medium and the content of the effective rust-preventive components in the medium. By adjusting the ratio of the alkaline retainer and potassium hydroxide to the rust inhibitor, a rust-preventive water-soluble quenching medium with excellent rust-preventive performance can be obtained. The rust-preventive water-soluble quenching media prepared in Examples 1 and 2 still maintain good rust-preventive performance even when diluted to a low concentration (5%). The higher the concentration of the rust-preventive water-soluble quenching medium, the better the rust-preventive performance of the cast iron chips.
[0093] Please refer to Figures 1 to 6 ,in, Figure 2 This is a schematic diagram showing the test results of the rust-preventive performance of cast iron chips at a concentration of 10% using the rust-preventive water-soluble quenching medium prepared in Comparative Example 1. Figure 2 The area circled in the middle is rust from cast iron filings.
[0094] When the concentration of the rust-preventive water-soluble quenching medium is the same, the higher the content of the effective rust-preventing component in the rust-preventive water-soluble quenching medium, the better the rust-preventive performance of cast iron chips. It is evident that the rust-preventive performance of the rust-preventive water-soluble quenching medium prepared in Example 1 is better than that prepared in Comparative Example 1. By increasing the proportion of the mixed dicarboxylic acid to increase the content of the effective rust-preventing component, and simultaneously increasing the content of the alkaline retainer and potassium hydroxide, the rust-preventive water-soluble quenching medium becomes weakly alkaline. Under the combined effect of a higher content of the effective rust-preventing component and the weakly alkaline nature of the rust-preventive water-soluble quenching medium, the rust-preventive water-soluble quenching medium prepared in Example 1 exhibits superior rust-preventive performance for cast iron chips.
[0095] Please refer to Figures 7 to 12 The rust-preventive water-soluble quenching medium prepared in Example 2 exhibits better rust-preventive properties for cast iron chips than the rust-preventive water-soluble quenching medium prepared in Comparative Example 2. By increasing the potassium hydroxide component, the pH value of the rust-preventive water-soluble quenching medium is increased. When the content of the effective rust-preventive component is approximately the same, the rust-preventive properties of the cast iron chips from the rust-preventive water-soluble quenching medium prepared in Example 2 with a pH value of 10.4-10.6 are superior to those from the rust-preventive water-soluble quenching medium prepared in Comparative Example 2 with a pH value of 9.0-9.1.
[0096] Table 4 shows the cooling rate characteristics of Examples 1-2 at a concentration of 5%:
[0097] Table 4 - Cooling rate characteristics test results of Examples 1-2 at 5% concentration
[0098] Maximum cooling rate / (°C / s) 202.83 206.71 Cooling rate at 300℃ / (℃ / s) 84.04 80.79 HP value 1686.53 1653.46
[0099] Depend on Figure 13 As shown in Table 4, the rust-resistant water-soluble quenching medium proposed in this invention has a high cooling rate (the maximum cooling rate is above 200℃ / s, and the cooling rate at 300℃ is above 80℃ / s), which enables the supercooled austenite to reach the martensitic transformation temperature zone at a relatively high cooling rate. It has good hardening and hardening capabilities, which is beneficial for metal workpieces to achieve the required hardening depth and hardness.
[0100] The rust-preventive water-soluble quenching medium proposed in this invention can form a multi-layer passivation protective film on the surface of metal workpieces, isolating them from air and moisture in the atmosphere. This reduces the activity of the metal and slows down the oxidation and corrosion rate, resulting in a longer-lasting and more effective rust prevention effect. Workpieces quenched with this rust-preventive water-soluble quenching medium exhibit excellent rust prevention performance. Even when diluted to a low concentration (5%), the rust-preventive water-soluble quenching medium maintains good rust prevention performance, effectively reducing the amount of quenching medium required for production and significantly lowering production costs.
[0101] In addition, the rust-preventive water-soluble quenching medium stock solution and its dilution are stable, can be stored for a long time, and are not prone to deterioration such as discoloration, agglomeration, or precipitation.
[0102] The rust-preventive water-soluble quenching medium uses high molecular weight water-soluble polyether 55000. This polyether is alkyl-terminated and has good reverse solubility. Appropriate quenching medium temperatures can be selected based on the different shapes and sizes of workpieces.
[0103] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.
Claims
1. A rust-preventive water-soluble quenching medium, characterized in that, The rust-preventive water-soluble quenching medium comprises the following components by mass percentage: water 30%-60%, cooling rate regulator 35%-55%, rust inhibitor, defoamer 0.01%-0.05%, alkalinity retainer, and potassium hydroxide 2.2%-8%; The rust inhibitor is a mixture of benzotriazole and mixed dicarboxylic acid, with the following mass percentages: benzotriazole 0.03%-0.08%, mixed dicarboxylic acid 3.5%-4.5%. The alkalinity retainer is a mixture of monoethanolamine, diethylethanolamine, and triethanolamine, with the following mass percentages: monoethanolamine 0.5%-1.5%, diethylethanolamine 0.5%-1.5%, and triethanolamine 2.5%-3.5%. The sum of all components is 100%; The cooling rate regulator is a polyether.
2. The rust-preventive water-soluble quenching medium as described in claim 1, characterized in that, The rust-preventive water-soluble quenching medium comprises the following components by mass percentage: water 30%-55%, cooling rate regulator 40%-50%, defoamer 0.01%-0.03%, and potassium hydroxide 2.5%-6%.
3. The rust-preventive water-soluble quenching medium as described in claim 1, characterized in that, Water 40%-50%, cooling rate regulator 40%-50%, defoamer 0.01%-0.03%, potassium hydroxide 2.5%-5.5%.
4. The rust-preventive water-soluble quenching medium as described in claim 1, characterized in that, The cooling rate regulator is polyether 55000.
5. The rust-preventive water-soluble quenching medium as described in claim 1, characterized in that, The defoamer is a siloxane.
6. A method for preparing a rust-preventive water-soluble quenching medium, used to prepare the rust-preventive water-soluble quenching medium as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Add water to the reactor, turn on the heating, and raise the temperature to 55±5℃; Step 2: Add rust inhibitor, alkaline retainer and potassium hydroxide in sequence, and start stirring; Step 3: After stirring for at least 30 minutes, add the cooling rate regulator and defoamer, and continue to circulate and stir for 1 hour to obtain the rust-preventive water-soluble quenching medium.