Aircraft surface salt removal and prevention cleaning agent and cleaning method

Abstract

The present application relates to the technical field of aircraft maintenance cleaning, and provides an aircraft surface salt removal and prevention cleaning agent and a cleaning method, the cleaning agent comprising the following components in percentage by mass: 0-30% of glycerol, 15-30% of a composite metal protective agent and 2-5% of an anti-salt protective agent, and the balance being distilled water, the composite metal protective agent comprising organic amine, organic acid, ethoxylated phosphate ester and benzotriazole, and the anti-salt protective agent comprising polydimethylsilane emulsion and potassium ferrocyanide; the cleaning agent effectively avoids the corrosion of salt water solution on the aircraft body material, especially metal material and metal plating, during the cleaning process, has good corrosion protection effect, and through the steps of rinsing and air drying or wiping, a protective film can be formed on the surface of the aircraft body, the crystallization of chlorides on the surface of the aircraft body is destroyed, the adhesion is reduced, the re-salting speed is effectively slowed down, and the cleaning agent is especially suitable for the salt removal and maintenance cleaning of military shipboard aircraft and near-shore military aircraft which are exposed to high-salt marine environment for a long time and have long-time low-altitude flight during flight.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aircraft maintenance cleaning, in particular to an aircraft surface salt removal and prevention cleaning agent and a cleaning method. BACKGROUND

[0002] Aircraft, especially military carrier aircraft and near-shore military aircraft, are exposed to high-salt marine environments for a long time, and during flight, they fly at low altitudes for a long time. Crystal salt deposits are easily formed on the surface of the aircraft. The salt deposits are mainly sodium chloride and other chlorides. A large amount of chloride ions can easily damage the passivation film on the metal surface, causing pitting corrosion, crevice corrosion and stress corrosion, which seriously affects the flight safety and service life of the aircraft. Therefore, the aircraft needs to be regularly maintained and cleaned to remove the salt deposits attached to the surface of the aircraft body.

[0003] The salt deposits on the surface of the aircraft are generally cleaned using water or conventional water-based aircraft surface cleaning agents. During the cleaning process, the crystal salt deposits are dissolved in the cleaning solution, forming a solution containing a certain concentration of chloride ions. The solution contacts the water-accumulating areas and poorly drained areas such as the landing gear, skin joints, fastener holes, flaps and hinge grooves of the aircraft during the cleaning process, which can easily lead to potential aggravated corrosion problems.

[0004] Currently, there are many reports and products of aircraft surface cleaning agents. Although the cleaning solution of the standard aircraft surface cleaning agent has good safety for the aircraft body materials, tests have shown that the cleaning solution of the conventional aircraft surface cleaning agent has no protective effect on the aircraft body materials, especially the metal materials and metal plating, after dissolving the chloride salt, and there is a serious corrosion phenomenon.

[0005] With the rapid development of China's military forces, the number of various types of military aircraft in military equipment has also rapidly increased. As the application research of corrosion protection of aircraft in marine climate environments gradually deepens, the special salt removal cleaning of aircraft has become an important corrosion protection means and research topic for aircraft maintenance management. Therefore, special development of a salt removal cleaning agent is needed. SUMMARY

[0006] In order to solve the problem of no protective effect of the cleaning solution on the aircraft body materials, especially the metal materials and metal plating, after dissolving the chloride salt, and the serious corrosion phenomenon, a kind of aircraft surface salt removal and prevention cleaning agent and a cleaning method are provided.

[0007] In one aspect, the present application provides an aircraft surface salt removal and prevention cleaning agent, which comprises the following components by mass percentage: 15-30% of a composite metal protection agent and 2-5% of a salt-resistant protection agent, and the balance is distilled water.

[0008] Further, the composite metal protection agent comprises organic amine, organic acid, ethoxylated phosphate and benzotriazole, and the mass ratio of the organic amine: organic acid: ethoxylated phosphate: benzotriazole is 10-20: 5-10: 0.1-0.5: 0.1-0.5.

[0009] Further, the anti-salt protection agent comprises polydimethylsilane emulsion and potassium ferrocyanide, and the mass ratio of the polydimethylsilane emulsion: potassium ferrocyanide is 2-5: 0.01-0.03.

[0010] Further, the organic amine is diaminopropanolamine or isopropanolamine.

[0011] Further, the organic acid comprises two or more of p-toluenesulfonamide hexanoic acid, triazine triaminohexanoic acid, nonanoic acid or decanoic acid.

[0012] Further, the ethoxylated phosphate structure is R-(CH2CH2O)n-PH2O3, wherein R is C8-C10 alkyl, and n is 6.

[0013] Further, the cleaning agent further comprises glycerol, and the mass percentage of the glycerol is less than or equal to 30%.

[0014] Another aspect provides an aircraft surface salt removal and prevention cleaning method, comprising the following steps:

[0015] S1, cleaning salt accumulation, diluting the cleaning agent, and applying the diluted cleaning agent to the surface of salt accumulation, and cleaning and removing the salt accumulation by spraying or scrubbing;

[0016] S2, anti-salt rinsing, rinsing the surface from which the salt accumulation has been removed 1-2 times using the diluted cleaning agent in S1;

[0017] S3, anti-salt film forming, drying or airing after rinsing.

[0018] Further, the cleaning agent is diluted by diluting with water to a mass concentration of 10%-30%.

[0019] The advantages of the present application are as follows:

[0020] The cleaning agent of the present application effectively avoids the corrosion of salt water solution on the aircraft body material, especially the metal material and metal plating layer during the cleaning process, has good corrosion protection effect, and can form a protective film on the surface of the aircraft body after cleaning, destroy the crystallization of chlorides on the surface of the aircraft body, reduce the adhesion, effectively slow down the speed of salt accumulation, and is especially suitable for salt removal and maintenance cleaning of military carrier-based aircraft and near-shore military aircraft which are exposed to high-salt marine environment for a long time and have long time low-altitude flight during flight. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a figure of the crevice corrosion test result of Example 1 of the present application;

[0022] Figure 2 is a figure of the crevice corrosion test result of Comparative Example 1 of the present application;

[0023] Figure 3 is a figure of the unpainted surface influence test result of Example 1 of the present application;

[0024] Figure 4 is a figure of the unpainted surface influence test result of Comparative Example 1 of the present application;

[0025] Figure 5 is a figure of the salt deposit resistance test result of the present application after cleaning. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0027] It should be noted that the installation modes and technical terms mentioned in the present application are all technical terms well known in the art, and therefore will not be explained in more detail. In addition, the same reference numerals are used for the same components, but this does not affect or should not affect the accurate understanding of the technical solutions by those skilled in the art.

[0028] An aircraft surface salt removal and prevention cleaning agent, which is composed of the following components in mass percentage: a composite metal protection agent 15%-30% and a salt resistance protection agent 2%-5%, and the balance is distilled water.

[0029] The composite metal protection agent comprises an organic amine, an organic acid, an ethoxylated phosphate ester and a benzotriazole, and the mass ratio of the organic amine: the organic acid: the ethoxylated phosphate ester: the benzotriazole is 10-20: 5-10: 0.1-0.5: 0.1-0.5.

[0030] The organic amine is diaminopropanolamine or isopropanolamine. The organic acid comprises two or more than two of p-toluenesulfonamide hexanoic acid, triazine triaminohexanoic acid, nonanoic acid or decanoic acid. The ethoxylated phosphate ester has a structure of R-(CH2CH2O)n-PH2O3, wherein R is an alkyl group of C8-C10, and n is 6.

[0031] When the cleaning agent is provided for application in a low temperature environment, glycerol can be added to maintain the low temperature stability of the cleaning agent.

[0032] The anti-salt protective agent includes polydimethylsilane emulsion and potassium ferrocyanide, and the mass ratio of polydimethylsilane emulsion:potassium ferrocyanide is 1-5:0.01-0.03.

[0033] The polydimethylsilane emulsion forms an oil film on the surface of the cleaned aircraft, forms a protective layer, makes the surface have good fluidity, reduces the aggregation and adhesion of salt water, and avoids the deposition of salt.

[0034] The application discloses an aircraft surface salt removal and anti-salt cleaning agent.

[0035] S1, cleaning salt, diluting the cleaning agent to 10%-30% mass concentration with water, and coating the dilute cleaning agent on the salt surface, and cleaning and removing the salt by spraying or scrubbing;

[0036] S2, anti-salt rinsing, using the dilute cleaning agent in S1 to rinse the surface from which the salt has been removed for 1-2 times;

[0037] S3, anti-salt film forming, drying or airing after rinsing.

[0038] Through the steps of rinsing and airing or drying, the anti-salt protective agent component in the cleaning agent can form a protective layer on the surface to prevent the deposition of salt on the surface.

[0039] Embodiment 1,

[0040] An aircraft surface salt removal and anti-salt cleaning agent, components and mass percentages thereof are as follows:

[0041] Distilled water 51.49%, glycerol 20%, isopropyl alcohol amine 16%, p-toluenesulfonamide hexanoic acid 8%, nonanoic acid 2%, ethoxylated phosphate ester 0.3%, benzotriazole 0.2%, polydimethylsilane emulsion 2%, and potassium ferrocyanide 0.01%.

[0042] According to the mass percentages, the components are mixed and dissolved to configure the cleaning agent.

[0043] Embodiment 2

[0044] An aircraft surface salt removal and anti-salt cleaning agent, components and mass percentages thereof are as follows:

[0045] Distilled water 60.28%, glycerol 15%, diaminopropanol amine 12%, triazine triaminohexanoic acid 6%, decanoic acid 3%, ethoxylated phosphate ester 0.5%, benzotriazole 0.2%, polydimethylsilane emulsion 3%, and potassium ferrocyanide 0.02%.

[0046] According to the mass percentages, the components are mixed and dissolved to configure the cleaning agent.

[0047] Example 3

[0048] An aircraft surface salt removal and prevention cleaning agent, the components and mass percentages are as follows:

[0049] Distilled water 64.29%, isopropanol amine 10%, diaminobutanol amine 8%, p-toluene sulfonamide hexanoic acid 6%, triazine triaminohexanoic acid 3%, decanoic acid 3%, ethoxylated phosphate ester 0.5%, benzotriazole 0.2%, polydimethylsilane emulsion 5%, potassium ferrocyanide 0.01%.

[0050] According to the mass percentages described above, the components are mixed and dissolved to configure the cleaning agent.

[0051] Comparative Example 1: A general aircraft outer surface cleaning agent is selected, produced by CHEMETALL, model ARDROX6025.

[0052] Experimental Example 1: PH value detection

[0053] The PH values of the cleaning agents of Example 1 to Example 3 and Comparative Example 1 were tested according to the method in GB / T6368, as shown in Table 1.

[0054] Table 1 PH value detection results

[0055]

[0056]

[0057] Experimental Example 2: Full immersion corrosion test

[0058] The cleaning agents of Example 1 to Example 3 and Comparative Example 1 were subjected to full immersion corrosion test according to the method in 4.5.4 of GJB8622-2015, and the corrosion amount results are shown in Table 2, unit: mg / cm 2 24h.

[0059] Table 2 Full immersion corrosion test results

[0060] Metal material Example 1 Example 2 Example 3 Comparative Example 1 7A04-T6 0.01 0.02 0.03 10 TC4 titanium alloy 0.003 0.003 0.005 0.08 45# steel 0.005 0.006 0.008 15 MB2 magnesium alloy 0.06 0.09 0.08 20

[0061] The full immersion corrosion effects of Example 1 to Example 3 are all better than that of Comparative Example 1, and the optimal Example 1 is selected for subsequent test.

[0062] Experimental Example 3: Crevice corrosion test

[0063] The crevice corrosion of the cleaning agent of Example 1 and the cleaning agent of Comparative Example 1 on 2A12-T3 (aluminum-coated), 2A12-T3 (bare aluminum), 7A04-T6 (aluminum-coated), and 7A04-T6 (bare aluminum) was tested according to the method of 4.5.6 in GJB8622-2015, and the crevice corrosion test results are shown in Figure 1 and Figure 2 .

[0064] The crevice corrosion grade of the cleaning agent of Example 1 was significantly lower than that of the cleaning agent of Comparative Example 1, and there was no crevice corrosion on 2A12-T3 (aluminum-coated), 2A12-T3 (bare aluminum), and 7A04-T6 (aluminum-coated).

[0065] Experimental Example 4: Impact Test on Non-painted Surface

[0066] The impact test of the cleaning agent of Example 1 and the cleaning agent of Comparative Example 1 on non-painted surface was tested according to the method of 4.5.16 in GJB8622-2015, and the surface change results are shown in Table 3, and the appearance changes are shown in Figure 3 and Figure 4 .

[0067] Table 3 Impact Test Results on Non-painted Surface

[0068] Metal material Example 1 Comparative Example 1 7A04-T6 (aluminum-coated) No streaks, no spots on the surface Spots corrosion on the surface TC4 titanium alloy No streaks, no spots on the surface No streaks, no spots on the surface

[0069] The cleaning agent of Example 1 had no impact on the metal material of the non-painted surface, which was better than that of Comparative Example 1.

[0070] Experimental Example 5: Corrosion Test on Cadmium-titanium Plating

[0071] The corrosion test on cadmium-titanium plating was carried out according to the method of 4.5.5 in GJB8622-2015, and the corrosion amount results are shown in Table 4, with the unit of mg / cm 2 · 24h, the cleaning agent of Example 1 had no obvious corrosion discoloration on cadmium-titanium plating, which was better than that of Comparative Example 1.

[0072] Table 4 Corrosion Test Results on Cadmium-titanium Plating

[0073]

[0074] Experimental Example 6: Surface Salt Deposition Resistance Test After Cleaning

[0075] The test plate used in 4.2.8 of GJB8622-2015 is used to wash the sample according to the steps of S1 salt accumulation cleaning, S2 salt prevention rinsing, and S3 salt prevention film forming with 10% concentration of the diluent of the cleaning agent in Example 1 and Comparative Example 1, and then the treated test plate is placed in the neutral salt spray test conditions specified in 5.2 of GB / T10125 for 4 hours, then the test plate is taken out and placed in a 38℃ oven for drying for 30min, and the salt deposition on the surface of the test plate is observed, and the results are shown in Figure 5 After the cleaning agent in Comparative Example 1 is cleaned, there is still a large amount of salt accumulation, and after the cleaning agent in Example 1 is cleaned, there is only a small amount of salt accumulation on the surface, which is significantly better than Comparative Example 1.

[0076] As shown by Experimental Examples 2-6, the cleaning agent of the present application can effectively prevent the corrosion of the salt water solution on the body material, especially the metal material and metal plating, during the cleaning process, and has good corrosion protection effect; Experimental Example 6 shows that Example 1 can effectively slow down the rate of re-salt accumulation, and a protective film can be formed on the surface of the body after cleaning, which can destroy the crystallization of chloride on the surface of the body and reduce its adhesion, and is especially suitable for salt removal and maintenance cleaning of military carrier-based aircraft and near-shore military aircraft that are exposed to high-salt marine environments for a long time and have long-time low-altitude flight during flight.

[0077] For those skilled in the art, the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application; therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0078] The above is only a preferred embodiment of the present application and is not intended to limit the present application, and any minor modification, equivalent replacement and improvement of the above embodiments according to the technical essence of the present application should be included in the protection scope of the technical solution of the present application.

Claims

1. An aircraft surface de- and anti-icing cleaning agent, characterized in that, The cleaning agent is composed of the following components by mass percentage: a composite metal protection agent 15%-30% and a salt resistance protection agent 2%-5%, with the balance being distilled water; the composite metal protection agent comprises an organic amine, an organic acid, an ethoxylated phosphate ester and a benzotriazole, and the mass ratio of the organic amine: organic acid: ethoxylated phosphate ester: benzotriazole is 10-20: 5-10: 0.1-0.5: 0.1-0.5; the salt resistance protection agent comprises a polydimethylsilane emulsion and potassium ferrocyanide, and the mass ratio of the polydimethylsilane emulsion: potassium ferrocyanide is 1-5: 0.01-0.

03.

2. An aircraft surface de-icing and anti-icing cleaning agent according to claim 1, wherein, The organic amine is diaminopropanolamine or isopropanolamine.

3. The aircraft surface salt removal and prevention cleaning agent according to claim 1, characterized in that, The organic acid comprises two or more of p-toluenesulfonamide hexanoic acid, triazine triaminohexanoic acid, nonanoic acid or decanoic acid.

4. The aircraft surface deicing and anti-icing cleaning agent of claim 1, wherein, The ethoxylated phosphate structure is R-(CH2CH2O) n -PH2O3, wherein R is an alkyl group of C8-C10 and n is 6.

5. An aircraft surface de-icing and anti-icing cleaning agent according to any one of claims 1 to 4, characterised in that, The cleaning agent further comprises glycerol, and the mass percentage of the glycerol is less than or equal to 30%.

6. A method of cleaning an aircraft surface using the salt removing and preventing cleaning agent according to claim 5, characterized in that, The method comprises the following steps: S1, cleaning salt accumulation, diluting the cleaning agent, and applying the diluted cleaning agent to the surface of the salt accumulation, and cleaning and removing the salt accumulation by spraying or scrubbing; S2, salt resistance rinsing, rinsing the surface from which the salt accumulation has been removed 1-2 times using the diluted cleaning agent of step S1; S3, salt resistance film forming, and drying or airing after rinsing.

7. A method of cleaning an aircraft surface to remove and prevent salt deposits according to claim 6, wherein, The cleaning agent is diluted to a mass concentration of 10%-30% by water. The organic amine is diaminopropanolamine or isopropanolamine. The organic acid comprises two or more of p-toluenesulfonamide hexanoic acid, triazine triaminohexanoic acid, nonanoic acid or decanoic acid. The cleaning agent further comprises glycerol, and the mass percentage of the glycerol is less than or equal to 30%. The method comprises the following steps: S1, cleaning salt accumulation, diluting the cleaning agent, and applying the diluted cleaning agent to the surface of the salt accumulation, and cleaning and removing the salt accumulation by spraying or scrubbing; S2, salt resistance rinsing, rinsing the surface from which the salt accumulation has been removed 1-2 times using the diluted cleaning agent of step S1; S3, salt resistance film forming, and drying or airing after rinsing. The cleaning agent is diluted to a mass concentration of 10%-30% by water.

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