A method for preparing a water-based corrosion inhibitor for aviation

Abstract

The application discloses a preparation method of a water-based corrosion inhibitor for aviation, and comprises the following steps: S1, weighing medicines, and the weight percentage of the medicines is specifically 5-30% of urotropin, 1-30% of p-toluenesulfonate, 1-20% of polyhydroxycarboxylate, 1-20% of imidazole, 1-20% of pyridine and 1-15% of sodium salt; S2, adding sufficient water into a container and heating the water to 30-40 DEG C through water bath; S3, adding the medicines weighed in S1 into the container, and stirring and mixing, wherein the stirring time is 20-40 min, and the stirring speed is 50-500 rpm, so as to obtain the water-based corrosion inhibitor, and the composition of the water-based corrosion inhibitor is as follows: 5-20% of urotropin, 1-20% of p-toluenesulfonate, 1-15% of polyhydroxycarboxylate, 1-15% of imidazole, 1-15% of pyridine, 1-10% of sodium salt and the balance of water, and according to GJB8622-2015, the water-based corrosion inhibitor for aviation of the application meets the corresponding experimental requirements and does not contain phosphorus, and is pollution-free to the environment.

Description

Technical Field

[0001] This invention belongs to the field of corrosion inhibitor technology, specifically relating to a method for preparing a water-based corrosion inhibitor for aviation. Background Technology

[0002] During flight and parking, aircraft inevitably accumulate contaminants such as salt spray, dust, and sand on their external surfaces and components. These contaminants not only affect the aircraft's appearance, reducing its surface smoothness, but more seriously, areas where contaminants accumulate often become inducing factors for corrosion, endangering the aircraft's flight safety. Therefore, developing corrosion inhibitors that have no adverse effects on the metallic materials, coatings, and non-metallic materials that combat aircraft may come into contact with is of great significance.

[0003] Commonly used phosphorus-based corrosion inhibitors, due to their high phosphorus content, can easily cause eutrophication and environmental pollution when discharged into water bodies. Oil-soluble corrosion inhibitors typically use alkanes and alcohols as solvents, which generally have drawbacks such as low flash points and toxicity, posing challenges related to storage, use, and environmental impact. Therefore, developing a phosphorus-free, water-based, environmentally friendly corrosion inhibitor is essential. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a method for preparing a water-based corrosion inhibitor for aviation, thereby solving the problem of toxicity in existing oil-soluble corrosion inhibitor products.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for preparing a water-based corrosion inhibitor for aviation includes the following steps:

[0007] S1: Weigh the drug according to the preset weight percentage. The drug includes urotropine, p-toluenesulfonate, polyhydroxycarboxylate, imidazole, pyridine, and sodium salt.

[0008] S2: Add water to the container and heat it in a water bath to the preset temperature;

[0009] S3: Add the weighed medicine from S1 into a container and stir to mix to obtain a water-based corrosion inhibitor.

[0010] Preferably, the preset weight percentages are: 5%-30% hexamethylenetetramine, 1%-30% p-toluenesulfonate, 1%-20% polyhydroxycarboxylate, 1%-20% imidazole, 1%-20% pyridine, and 1%-15% sodium salt.

[0011] Preferably, after stirring and mixing in S3, the water-based corrosion inhibitor has the following composition by weight percentage: 5%-20% hexamethylenetetramine, 1%-20% p-toluenesulfonate, 1%-15% polyhydroxycarboxylate, 1%-15% imidazole, 1%-15% pyridine, 1%-10% sodium salt, and the balance being water.

[0012] Preferably, the p-toluenesulfonate is at least one of glycine benzyl ester p-toluenesulfonate and S-adenosylmethionine p-toluenesulfonate.

[0013] Preferably, the polyhydroxycarboxylic acid salt is sodium gluconate.

[0014] Preferably, pyridine is at least one of hydroxypyridine, aminopyridine, and mercaptopyridine.

[0015] Preferably, the sodium salt is at least one of sodium nitrite and sodium benzoate.

[0016] Preferably, the preset temperature in S2 is 30-40℃.

[0017] Preferably, the mixing time in S3 is 20-40 min, and the mixing speed is 50-500 rpm.

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

[0019] This application provides a method for preparing a water-based corrosion inhibitor for aviation applications. According to GJB8622-2015, the water-based corrosion inhibitor of this invention meets the requirement that the mass change of the sample in a full immersion test does not exceed 0.04 mg / cm³. 2 • The mass change of the coating corrosion sample over 24 hours should not exceed 0.2 mg / cm³. 2 • The corrosion area of ​​the crevice corrosion sample must not exceed 5% within 24 hours, and this corrosion inhibitor is phosphorus-free and environmentally friendly. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the process of this application. Detailed Implementation

[0021] To facilitate understanding of the technical content of this invention by those skilled in the art, the invention will be further described in detail below with reference to the accompanying drawings and specific examples. It should be understood that the specific examples described herein are merely illustrative and not intended to limit the scope of the invention.

[0022] Example 1

[0023] like Figure 1 As shown, a method for preparing a water-based corrosion inhibitor for aviation includes the following steps:

[0024] S1: Weigh the medicine, specifically the following weight percentages: 5%-30% urotropine, 1%-30% p-toluenesulfonate, 1%-20% polyhydroxycarboxylate, 1%-20% imidazole, 1%-20% pyridine, and 1%-15% sodium salt.

[0025] S2: Add sufficient water to the container and heat it in a water bath to 30-40℃;

[0026] S3: Add the weighed medicine from S1 to a container and stir to mix. The stirring time is 20-40 minutes and the stirring speed is 50-500 rpm to obtain a water-based corrosion inhibitor. The water-based corrosion inhibitor consists of the following components by weight percentage: 5%-20% hexamethylenetetramine, 1%-20% p-toluenesulfonate, 1%-15% polyhydroxycarboxylate, 1%-15% imidazole, 1%-15% pyridine, 1%-10% sodium salt, and the balance is water.

[0027] In this embodiment, this application provides a method for preparing a water-based corrosion inhibitor for aviation applications. According to GJB8622-2015, the water-based corrosion inhibitor for aviation applications of this invention meets the requirement that the mass change of the sample in a full immersion test does not exceed 0.04 mg / cm³. 2 • The mass change of the coating corrosion sample over 24 hours should not exceed 0.2 mg / cm³. 2 • The corrosion area of ​​the crevice corrosion sample must not exceed 5% within 24 hours, and this corrosion inhibitor is phosphorus-free and environmentally friendly.

[0028] Experimental data:

[0029] Experiment 1:

[0030] A method for preparing a water-based corrosion inhibitor for aviation applications, comprising the following raw materials by weight percentage: 8% hexamethylenetetramine, 10% glycine benzyl ester p-toluenesulfonate, 5% sodium gluconate, 5% imidazole, 10% aminopyridine, 3% sodium benzoate, and the balance being water. The method includes the following preparation steps:

[0031] Step 1: Weigh out 8% hexamethylenetetramine, 10% glycine benzyl ester p-toluenesulfonate, 5% sodium gluconate, 5% imidazole, 10% aminopyridine, and 3% sodium benzoate;

[0032] Step 2: Add the remaining water to the container and heat it in a water bath at a temperature of 30°C.

[0033] Step 3: Add the weighed medicine from Step 1 to the solution from Step 2 in sequence, and stir for 30 minutes at a stirring speed of 200 rpm.

[0034] The test results of the full immersion test samples of the aviation water-based corrosion inhibitor prepared in Experiment 1 are shown in Table 1, the test results of the coating corrosion samples are shown in Table 2, and the test results of the crevice corrosion samples are shown in Table 3.

[0035] Experiment 2:

[0036] A method for preparing a water-based corrosion inhibitor for aviation applications, comprising the following raw materials by weight percentage: 12% hexamethylenetetramine, 10% S-adenosylmethionine p-toluenesulfonate, 10% sodium gluconate, 5% imidazole, 8% hydroxypyridine, 8% mercaptopyridine, 5% sodium nitrite, with the balance being water. The method includes the following preparation steps:

[0037] Step 1: Weigh out 12% hexamethylenetetramine, 10% S-adenosylmethionine p-toluenesulfonate, 10% sodium gluconate, 5% imidazole, 8% hydroxypyridine, 8% mercaptopyridine, and 5% sodium nitrite;

[0038] Step 2: Add the remaining water to the container and heat it in a water bath at a temperature of 40°C.

[0039] Step 3: Add the weighed medicine from Step 1 to the solution from Step 2 in sequence, and stir for 40 minutes at a stirring speed of 300 rpm.

[0040] The test results of the full immersion test samples of the aviation water-based corrosion inhibitor prepared in Experiment 2 are shown in Table 1, the test results of the coating corrosion samples are shown in Table 2, and the test results of the crevice corrosion samples are shown in Table 3.

[0041] Experiment 3:

[0042] A method for preparing a water-based corrosion inhibitor for aviation applications, comprising the following raw materials by weight percentage: 15% hexamethylenetetramine, 5% glycine benzyl ester p-toluenesulfonate, 5% S-adenosylmethionine p-toluenesulfonate, 5% sodium gluconate, 10% imidazole, 5% aminopyridine, 5% mercaptopyridine, 5% sodium benzoate, with the balance being water. The method includes the following preparation steps:

[0043] Step 1: Weigh out 15% hexamethylenetetramine, 5% glycine benzyl ester p-toluenesulfonate, 5% S-adenosylmethionine p-toluenesulfonate, 5% sodium gluconate, 10% imidazole, 5% aminopyridine, 5% mercaptopyridine, and 5% sodium benzoate.

[0044] Step 2: Add the remaining water to the container and heat it in a water bath at a temperature of 40°C.

[0045] Step 3: Add the weighed medicine from Step 1 to the solution from Step 2 in sequence, and stir for 50 minutes at a stirring speed of 300 rpm.

[0046] The test results of the full immersion test samples of the aviation water-based corrosion inhibitor prepared in Experiment 3 are shown in Table 1, the test results of the coating corrosion samples are shown in Table 2, and the test results of the crevice corrosion samples are shown in Table 3.

[0047] Comparative Example

[0048] A commercially available water-based corrosion inhibitor was selected for full immersion tests, coating corrosion tests, and crevice corrosion tests. The test results for the comparative corrosion inhibitor's full immersion test samples are shown in Table 1, the coating corrosion test samples are shown in Table 2, and the crevice corrosion test samples are shown in Table 3.

[0049] Table 1

[0050]

[0051] Table 2

[0052]

[0053] Table 3

[0054]

[0055] As can be seen from the test results in Table 1-3 above, the water-based corrosion inhibitors for aviation prepared in Experiments 1-3 all meet the requirements of GJB8622-2015, where the mass change of the full immersion test specimen does not exceed 0.04 mg / cm³. 2 • The mass change of the coating corrosion sample over 24 hours should not exceed 0.2 mg / cm³. 2 • The index is that the corrosion area of ​​the crevice corrosion sample does not exceed 5% within 24 hours.

[0056] The above embodiments illustrate and describe the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles and main features of the invention and are not intended to limit the scope of the invention in any way. Various changes and modifications can be made to the invention without departing from its scope, and all such changes and modifications fall within the scope of the claims.

Claims

1. A method for preparing a water-based corrosion inhibitor for aviation, characterized in that, Includes the following steps: S1: Weigh the drug according to the preset weight percentage. The drug includes urotropine, p-toluenesulfonate, polyhydroxycarboxylate, imidazole, pyridine, and sodium salt. The p-toluenesulfonate is at least one of glycine benzyl ester p-toluenesulfonate and S-adenosylmethionine p-toluenesulfonate. S2: Add water to the container and heat it in a water bath to the preset temperature, which is 30-40℃; S3: Add the weighed medicine from S1 into a container, stir and mix to obtain a water-based corrosion inhibitor; After mixing, the water-based corrosion inhibitor has the following composition by weight percentage: 5%-20% hexamethylenetetramine, 1%-20% p-toluenesulfonate, 1%-15% polyhydroxycarboxylate, 1%-15% imidazole, 1%-15% pyridine, 1%-10% sodium salt, and the remainder is water.

2. The method for preparing a water-based corrosion inhibitor for aviation according to claim 1, characterized in that, The polyhydroxycarboxylic acid salt is sodium gluconate.

3. The method for preparing a water-based corrosion inhibitor for aviation according to claim 1, characterized in that, Pyridine is at least one of hydroxypyridine, aminopyridine, and mercaptopyridine.

4. The method for preparing a water-based corrosion inhibitor for aviation according to claim 1, characterized in that, The sodium salt is at least one of sodium nitrite and sodium benzoate.

5. The method for preparing a water-based corrosion inhibitor for aviation according to claim 1, characterized in that, The mixing time in S3 is 20-40 minutes, and the mixing speed is 50-500 rpm.

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