Internal combustion locomotive coolant corrosion inhibitor additive, coolant and additive preparation method

Abstract

The present invention belongs to the technical field of diesel locomotive coolants, and provides a diesel locomotive coolant corrosion inhibitor additive, a coolant, and a method for preparing the additive, comprising the following steps: dissolving 3 wt% of benzotriazole in ethanol, and simultaneously adding 10 wt% of sodium benzoate and deionized water, and stirring evenly; adding sodium silicate, polyethylene glycol, zinc acetate, and sodium gluconate, and fully dissolving them; then adding polyepoxysuccinic acid, hydroxyethylidene diphosphonic acid, and aminotrimethylene phosphoric acid; after stirring evenly, adding sodium tetraborate, and gradually adding sodium hydroxide using a pH meter to adjust the pH of the solution to 13, thereby preparing a corrosion inhibitor additive. The corrosion inhibitor additive is added to deionized water, and a few drops of thymolphthalein are added for color development, thereby preparing a diesel locomotive coolant. The present invention has excellent corrosion inhibition effects on various metals, and has excellent long-term protection, storage stability, hard water resistance, and other properties. The preparation process is simple and meets safety and environmental protection requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel locomotive coolant, and in particular relates to a corrosion inhibitor additive for diesel locomotive coolant, the coolant and a method for preparing the additive. Background Art

[0002] Corrosion in diesel locomotive cooling systems is a complex physical and chemical process that damages components, reduces their mechanical strength, and can even lead to traffic accidents. Therefore, the development of an efficient, low-cost organic coolant corrosion inhibitor is crucial. Early engine coolant corrosion inhibitors in my country were mostly two-component, and the two components had to be packaged separately. When preparing the coolant, the first component must be dissolved before the second component is added. Improper preparation can lead to precipitation, which not only renders the coolant useless but also increases the amount of solid matter at the bottom of the tank, making tank cleaning difficult. Therefore, this two-component corrosion inhibitor is very inconvenient to use. A single-component corrosion inhibitor formula can address the inconveniences of traditional corrosion inhibitors during transportation, packaging, storage, and preparation, saving equipment and labor costs.

[0003] In engine water-cooling systems, coolant comes into contact with a variety of metals. To achieve corrosion protection for these metals, a comprehensive formulation of corrosion inhibitors is essential. However, different metals require different types and dosages of effective corrosion inhibitors, and different inhibitor components can exhibit synergistic or antagonistic effects. Therefore, determining the optimal dosage ratio of corrosion inhibitors to achieve synergy and avoid antagonism remains a complex challenge in the corrosion inhibition field. Summary of the Invention

[0004] The present invention provides a corrosion inhibitor additive for diesel locomotive coolant, a coolant and a method for preparing the additive, aiming to solve the problems raised in the above background technology.

[0005] The invention discloses a single-component corrosion inhibitor additive for diesel locomotive coolant, the main ingredients of which include: organic acid corrosion inhibitor, benzotriazole, sodium benzoate, sodium gluconate, sodium silicate, sodium tetraborate, polyethylene glycol, zinc acetate and a color developer; the organic acid corrosion inhibitor includes: polyepoxysuccinic acid, hydroxyethylidene diphosphonic acid and aminotris(methylene)phosphonic acid.

[0006] The method for preparing a corrosion inhibitor additive of the present invention comprises the following steps: S1. dissolving 3 wt% benzotriazole in ethanol, adding 10 wt% sodium benzoate and deionized water, and stirring evenly; S2. adding sodium silicate, polyethylene glycol, zinc acetate, and sodium gluconate, and stirring thoroughly until the sodium silicate, polyethylene glycol, zinc acetate, and sodium gluconate are dissolved; S3. then adding polyepoxysuccinic acid, hydroxyethylidene diphosphonic acid, and aminotrimethylene phosphoric acid; S4. after stirring evenly, adding sodium tetraborate, and gradually adding sodium hydroxide using a pH meter to adjust the pH of the solution to 13, thereby preparing the corrosion inhibitor additive. Optionally, the mass percentage of the sodium silicate is 0.5 wt%.

[0007] Optionally, the mass percentage of the polyethylene glycol is 1.5 wt%.

[0008] Optionally, the mass percentage of the zinc acetate is 0.2-0.4 wt%.

[0009] Optionally, the mass percentage of the sodium gluconate is 16.5-27.5wt%.

[0010] Optionally, the mass percentage of the sodium tetraborate is 9.2 to 24.2 wt%.

[0011] Optionally, the mass percentage of the polyepoxysuccinic acid is 30 to 50 wt%.

[0012] Optionally, the mass percentage of the hydroxyethylidene diphosphonic acid is 2.5 to 4 wt%.

[0013] Optionally, the mass percentage of the aminotrimethylene phosphoric acid is 4 wt %.

[0014] Coolant, adding deionized water to the diesel locomotive coolant corrosion inhibitor additive, and making the mass ratio of the diesel locomotive coolant corrosion inhibitor additive to water 1: (240-280); adding a few drops of thymolphthalein to develop color, to obtain the coolant.

[0015] The beneficial effects achieved by the present invention are:

[0016] (1) The organic acid corrosion inhibitor prepared by the present invention provides excellent heat exchange and protection performance while abandoning corrosion inhibitors such as nitrites and amines that have a greater impact on the environment and human body, meeting the requirements of safety and environmental protection.

[0017] (2) The present invention accurately compounds a variety of corrosion inhibitors, giving full play to the synergistic effect between the various substances, and has a good corrosion inhibition effect on a variety of metals such as brass, copper, solder, cast iron, carbon steel, and cast aluminum, and avoids the antagonistic effect. It provides a corrosion inhibitor additive formula with high corrosion inhibition for the cooling system of diesel locomotives, has excellent long-term protection, storage stability, hard water resistance and other properties, and meets the actual use requirements of high-power internal combustion engines such as HXN3 and HXN5 that have high requirements for corrosion inhibition performance.

[0018] (3) The present invention adds thymolphthalein color developer, and through visual analysis technology, non-professionals can visually detect the concentration of the corrosion inhibitor on the locomotive by visual inspection and simple colorimetry using the principle that chromaticity is proportional to concentration, thereby determining the amount of corrosion inhibitor to be added.

[0019] (4) The corrosion inhibitor of the present invention is a single component, which avoids the disadvantage of the inconvenience of using a two-component corrosion inhibitor. Non-professionals only need to complete the dosing process according to a simple proportion using the locomotive car as a carrier during locomotive maintenance. No heating or pretreatment steps are required, saving unnecessary equipment expenses and manpower. In addition, due to its non-precipitation and easy solubility, the corrosion inhibition effect is fully exerted without waste. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0021] As used herein, the terms "including," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps, operations, components, or modules is not limited to the listed steps, operations, components, or modules, but may optionally include steps, operations, components, or modules not listed, or may optionally include other steps, operations, components, or modules that are inherent to the process, method, product, or apparatus.

[0022] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] An exemplary embodiment of a method for preparing a single-component corrosion inhibitor additive for a diesel locomotive coolant;

[0024] Example 1

[0025] S1. Dissolve 3 wt% of benzotriazole in a small amount of ethanol, add 10 wt% of sodium benzoate and deionized water, and stir evenly.

[0026] S2. Sequentially add 0.5 wt% sodium silicate, 1.5 wt% polyethylene glycol, 0.3 wt% zinc acetate, and 16.5 wt% sodium gluconate, stirring thoroughly until the sodium silicate, polyethylene glycol, zinc acetate, and sodium gluconate are dissolved.

[0027] S3. Then add 50 wt% polyepoxysuccinic acid, 2.5 wt% hydroxyethylidene diphosphonic acid, and 4 wt% aminotrimethylene phosphoric acid.

[0028] S4. After stirring evenly, 11.7 wt% sodium tetraborate was added, and sodium hydroxide was gradually added using a pH meter to adjust the pH of the solution to 13 to prepare a corrosion inhibitor additive.

[0029] Preparation of diesel locomotive coolant: Take 2.8g of corrosion inhibitor and add it to 750mL of deionized water, stir to dissolve the corrosion inhibitor, add a few drops of thymolphthalein to develop color, and then prepare the coolant.

[0030] Determination of metal corrosion inhibition rate in coolant:

[0031] (1) According to the standard "Q / CR183.2014 Coolant for Internal Combustion Locomotives", place the prepared test piece bundle with metal test pieces in the coolant and cover it with a plug.

[0032] (2) Place the thermometer and vent tube in the coolant to conduct corrosion inhibition experiments on metal specimens.

[0033] (3) The temperature of the corrosion inhibition experiment should be maintained at around 80°C, the air flow rate should be (100±10)mL / min, and the experimental time should be 2 weeks.

[0034] (4) After the experiment, the test pieces were washed and weighed, and their corrosion inhibition rates were calculated. The test results are shown in Table 1.

[0035] Table 1 Corrosion inhibition rate of different metal specimens

[0036] test piece Corrosion inhibition rate brass 90.1％ Copper 92.0％ solder 86.7％ carbon steel 97.1％ cast aluminum 86.0％ cast iron 91.5％

[0037] Example 2

[0038] S1. Dissolve 3 wt% of benzotriazole in a small amount of ethanol, add 10 wt% of sodium benzoate and deionized water, and stir evenly.

[0039] S2. Add 0.5 wt% sodium silicate, 1.5 wt% polyethylene glycol, 0.4 wt% zinc acetate, and 21.5 wt% sodium gluconate in sequence, and stir thoroughly until the sodium silicate, polyethylene glycol, zinc acetate, and sodium gluconate are dissolved.

[0040] S3. Then add 40 wt% polyepoxysuccinic acid, 2.5 wt% hydroxyethylidene diphosphonic acid, and 4 wt% aminotrimethylene phosphoric acid.

[0041] S4. After stirring evenly, 16.6 wt % sodium tetraborate was added, and sodium hydroxide was gradually added using a pH meter to adjust the pH of the solution to 13 to prepare a corrosion inhibitor additive.

[0042] Preparation of diesel locomotive coolant: Take 3.1g of corrosion inhibitor and add it to 750mL of deionized water. Stir thoroughly to dissolve the corrosion inhibitor. Add a few drops of thymolphthalein to develop color to prepare the coolant.

[0043] Determination of metal corrosion inhibition rate in coolant:

[0044] (1) According to the standard "Q / CR183.2014 Coolant for Diesel Locomotives", place the prepared test piece bundle with metal test pieces in the coolant and cover it with a plug.

[0045] (2) Place the thermometer and vent tube in the coolant to conduct corrosion inhibition experiments on metal specimens.

[0046] (3) The temperature of the corrosion inhibition experiment should be maintained at around 80°C, the air flow rate should be (100±10)mL / min, and the experimental time should be 2 weeks.

[0047] (4) After the experiment, the test pieces were washed and weighed, and their corrosion inhibition rates were calculated. The test results are shown in Table 2.

[0048] Table 2 Corrosion inhibition rate of different metal specimens

[0049] test piece Corrosion inhibition rate brass 92.0％ Copper 92.0％ solder 85.7％ carbon steel 97.6％ cast aluminum 87.6％ cast iron 88.7％

[0050] Example 3

[0051] S1. Dissolve 3 wt% of benzotriazole in a small amount of ethanol, add 10 wt% of sodium benzoate and deionized water, and stir evenly.

[0052] S2. Add 0.5 wt% sodium silicate, 1.5 wt% polyethylene glycol, 0.3 wt% zinc acetate, and 27.5 wt% sodium gluconate in sequence and stir thoroughly to dissolve.

[0053] S3. Then add 40 wt% of polyepoxysuccinic acid, 4 wt% of hydroxyethylidene diphosphonic acid, and 4 wt% of aminotrimethylene phosphoric acid.

[0054] S4. After stirring evenly, add 9.2 wt% sodium tetraborate and gradually add sodium hydroxide using a pH meter to adjust the pH of the solution to 13.

[0055] Preparation of diesel locomotive coolant: Take 3.68g of corrosion inhibitor and add it to 750mL of deionized water. Stir thoroughly to dissolve the corrosion inhibitor. Add a few drops of thymolphthalein to develop color to prepare the coolant.

[0056] Determination of metal corrosion inhibition rate in coolant:

[0057] (1) According to the standard "Q / CR183.2014 Coolant for Internal Combustion Locomotives", place the prepared test piece bundle with metal test pieces in the coolant and cover it with a plug.

[0058] (2) Place the thermometer and vent tube in the coolant to conduct corrosion inhibition experiments on metal specimens.

[0059] (3) The temperature of the corrosion inhibition experiment should be maintained at around 80°C, the air flow rate should be (100±10)mL / min, and the experimental time should be 2 weeks.

[0060] (4) After the experiment, the test pieces were washed and weighed, and their corrosion inhibition rates were calculated. The test results are shown in Table 3.

[0061] Table 3 Corrosion inhibition rate of different metal specimens

[0062] test piece Corrosion inhibition rate brass 96％ Copper 96％ solder 87.2％ carbon steel 98.2％ cast aluminum 91.1％ cast iron 82.3％

[0063] Example 4

[0064] S1. Dissolve 3 wt% of benzotriazole in a small amount of ethanol, add 10 wt% of sodium benzoate and deionized water, and stir evenly.

[0065] S2. Sequentially add 0.5 wt% sodium silicate, 1.5 wt% polyethylene glycol, 0.2 wt% zinc acetate, and 27.5 wt% sodium gluconate, stirring thoroughly until the sodium silicate, polyethylene glycol, zinc acetate, sodium gluconate, and sodium tetraborate are dissolved.

[0066] S3. Then add 30 wt% polyepoxysuccinic acid, 2.5 wt% hydroxyethylidene diphosphonic acid, and 4 wt% aminotrimethylene phosphoric acid.

[0067] S4. After stirring evenly, add 20.8 wt% sodium tetraborate, and gradually add sodium hydroxide using a pH meter to adjust the pH of the solution to 13 to prepare a corrosion inhibitor additive.

[0068] Preparation of diesel locomotive coolant: Take 2.8g of corrosion inhibitor and add it to 750mL of deionized water, stir to dissolve the corrosion inhibitor, add thymolphthalein to develop color, and then prepare the coolant.

[0069] Determination of metal corrosion inhibition rate in coolant:

[0070] (1) According to the standard "Q / CR183.2014 Coolant for Diesel Locomotives", place the prepared test piece bundle with metal test pieces in the coolant and cover it with a plug.

[0071] (2) Place the thermometer and vent tube in the coolant to conduct corrosion inhibition experiments on metal specimens.

[0072] (3) The temperature of the corrosion inhibition experiment should be maintained at around 80°C, the air flow rate should be (100±10)mL / min, and the experimental time should be 2 weeks.

[0073] (4) After the experiment, the test pieces were washed and weighed, and their corrosion inhibition rates were calculated. The test results are shown in Table 4.

[0074] Table 4 Corrosion inhibition rate of different metal specimens

[0075] test piece Corrosion inhibition rate brass 95.2％ Copper 84％ solder 97.6％ carbon steel 89.7％ cast aluminum 75.8％ cast iron 94.8％

[0076] Example 5

[0077] S1. Dissolve 3 wt% of benzotriazole in a small amount of ethanol, add 10 wt% of sodium benzoate and deionized water, and stir evenly.

[0078] S2. Add 0.5 wt% sodium silicate, 1.5 wt% polyethylene glycol, 0.2 wt% zinc acetate, and 16.5 wt% sodium gluconate in sequence and stir thoroughly to dissolve.

[0079] S3. Then add 40 wt% polyepoxysuccinic acid, 3.1 wt% hydroxyethylidene diphosphonic acid, and 4 wt% aminotrimethylene phosphoric acid.

[0080] S4. After stirring evenly, add 24.2 wt% sodium tetraborate, and gradually add sodium hydroxide using a pH meter to adjust the pH of the solution to 13 to prepare a corrosion inhibitor additive.

[0081] Preparation of diesel locomotive coolant: Take 3.68g of corrosion inhibitor and add it to 750mL of deionized water. Stir thoroughly to dissolve the corrosion inhibitor. Add a few drops of thymolphthalein to develop color to prepare the coolant.

[0082] Determination of metal corrosion inhibition rate in coolant:

[0083] (1) According to the standard "Q / CR183.2014 Coolant for Diesel Locomotives", place the prepared test piece bundle with metal test pieces in the coolant and cover it with a plug.

[0084] (2) Place the thermometer and vent tube in the coolant to conduct corrosion inhibition experiments on metal specimens.

[0085] (3) The temperature of the corrosion inhibition experiment should be maintained at around 80°C, the air flow rate should be (100±10)mL / min, and the experimental time should be 2 weeks.

[0086] (4) After the experiment, the test pieces were washed and weighed, and their corrosion inhibition rates were calculated. The test results are shown in Table 5.

[0087] Table 5 Corrosion inhibition rate of different metal specimens

[0088]

[0089]

[0090] The above experimental tests show that the corrosion inhibitor disclosed in the present invention for use in diesel locomotive coolant has excellent corrosion inhibition effects on a variety of metals, and has excellent long-term protection, storage stability, hard water resistance and other properties. The preparation process is simple and meets safety and environmental protection requirements, and can meet the actual use requirements of high-power internal combustion engines such as HXN3 and HXN5 that have high requirements for corrosion inhibition performance.

[0091] Specifically, the organic acid type corrosion inhibitor prepared by the present invention, while providing excellent heat exchange and protective performance, abandons the corrosion inhibitors such as nitrites and amines that have a greater impact on the environment and the human body, and meets the requirements of safety and environmental protection. The present invention has accurately compounded a variety of corrosion-inhibiting substances, fully exerted the synergistic effect between a variety of substances, and has a good corrosion inhibition effect on a variety of metals such as brass, copper, solder, cast iron, carbon steel, cast aluminum, and avoided antagonistic effects, and provided a corrosion inhibitor additive formula with an efficient corrosion inhibition effect for the cooling system of a diesel locomotive, with excellent long-term protection, storage stability, hard water resistance and other properties, meeting the actual use requirements of high-power internal combustion engines such as HXN3 and HXN5 and high corrosion inhibition performance requirements. The present invention has added thymolphthalein developer, and by visual analysis technology, it can be visually detected by non-professionals on a locomotive using the principle that chromaticity is proportional to concentration by visual inspection and simple colorimetry, so as to determine the amount of corrosion inhibitor to be added. The corrosion inhibitor of the present invention is a single component, which avoids the disadvantage of the inconvenience of using a two-component corrosion inhibitor. Non-professionals only need to complete the dosing process according to a simple proportion using the locomotive car as a carrier during locomotive maintenance. No heating or pretreatment steps are required, saving unnecessary equipment expenses and manpower. In addition, due to its non-precipitation and easy solubility, the corrosion inhibition effect is fully exerted without waste.

[0092] A single-component corrosion inhibitor additive for diesel locomotive coolant, comprising: an organic acid corrosion inhibitor, benzotriazole, sodium benzoate, sodium gluconate, sodium silicate, sodium tetraborate, polyethylene glycol, zinc acetate and a color developer; the organic acid corrosion inhibitor comprises: polyepoxysuccinic acid, hydroxyethylidene diphosphonic acid and aminotri(methylene)phosphonic acid. The small amount of zinc acetate described above can be compounded with aminotrimethylenephosphonic acid to further improve the corrosion inhibition effect of carbon steel; benzotriazole is a copper corrosion inhibitor that can be adsorbed on the copper surface to form a very thin film to protect the copper from corrosion by harmful media in water; sodium benzoate can be compounded with benzotriazole to fill the gaps in the benzotriazole adsorption film, and has a corrosion inhibition effect on cast aluminum, cast iron, solder, and carbon steel; sodium silicate can promote the passivation of cast aluminum or form a conversion film on its surface, inhibit the pitting corrosion of cast aluminum, thereby reducing the generation of crack sources and improving the pitting corrosion resistance of cast aluminum in solution; polyethylene glycol can make the film-forming performance of sodium silicate more stable; sodium tetraborate is conducive to the adsorption of oxygen on the metal surface and promotes the passivation of the metal, and has a good corrosion inhibition effect on cast iron; sodium gluconate has an excellent coordination effect and can be compounded with other corrosion inhibitors to improve the corrosion inhibition effect of the system; the color developer is thymolphthalein, which realizes the visual judgment of the concentration of the corrosion inhibition additive.

[0093] The exemplary embodiments of the present application may be combined with each other, and the exemplary embodiments obtained by the combination also fall within the scope of the present application.

[0094] This application uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for technical personnel in this field, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for preparing a corrosion inhibitor additive for diesel locomotive coolant, characterized in that: The steps include: S1. The mass percentage of 3wt% benzotriazole was dissolved in ethanol, and 10wt% of sodium benzoate and deionized water were added and stirred; S2. Add sodium silicate, polyethylene glycol, zinc acetate, and sodium gluconate, and stir thoroughly until the sodium silicate, the polyethylene glycol, the zinc acetate, and the sodium gluconate are dissolved; S3. Then polyepoxysuccinic acid, hydroxyethylidene diphosphonic acid and 4wt% by mass of amino trimethylene phosphoric acid were added; S4. After stirring, sodium tetraborate was added, and sodium hydroxide was gradually added using a pH meter to obtain a solution pH of 13 to prepare a corrosion inhibitor additive; The mass percentage of the sodium silicate is 0.5wt%; The mass percentage of the polyethylene glycol is 1.5wt%; The mass percentage of the zinc acetate is 0.2-0.4wt%; The mass percentage of the sodium gluconate is 16.5-27.5wt%; The mass percentage of the sodium tetraborate is 9.2-24.2 wt %; The mass percentage of the polyepoxysuccinic acid is 30-50wt%; The mass percentage of the hydroxyethylidene diphosphonic acid is 2.5-4 wt %.

2. A corrosion inhibitor additive for diesel locomotive coolant, characterized in that: The invention is prepared by the preparation method of the corrosion inhibitor additive for diesel locomotive coolant as described in claim 1.

3. Coolant, characterized in that: Deionized water is added to the diesel locomotive coolant corrosion inhibitor additive described in claim 2, and the mass ratio of the diesel locomotive coolant corrosion inhibitor additive to water is 1: (240-280); thymolphthalein is added for color development to obtain a coolant.

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