Preparation method of anti-condensation coating on surface of aluminum alloy and anti-condensation aluminum alloy

Abstract

The invention relates to a preparation method of an anti-condensation coating on the surface of an aluminum alloy and the anti-condensation aluminum alloy. The preparation method of the anti-condensation coating on the surface of the aluminum alloy comprises the following preparation steps that the surface of the aluminum alloy is subjected to laser treatment, and a pretreated aluminum alloy is obtained; and the pretreated aluminum alloy is placed in electrolyte for cathode deposition, an anti-condensation coating is deposited on the surface of the pretreated aluminum alloy, and the anti-condensation aluminum alloy is obtained. According to the preparation method of the anti-condensation coating on the surface of the aluminum alloy, the aluminum alloy is subjected to laser treatment, the pretreated aluminum alloy with high surface uniformity can be obtained, then the anti-condensation coating with high adhesive force can be formed on the surface of the pretreated aluminum alloy during cathode deposition, and the anti-condensation aluminum alloy with excellent anti-condensation performance is obtained.

Description

Technical Field

[0001] This application relates to the technical field of surface coatings, and particularly to a preparation method for an anti-condensation coating on the surface of aluminum alloy and an anti-condensation aluminum alloy. Background Art

[0002] Aluminum alloy has many advantages such as low density, excellent mechanical properties, and easy processing, and has now been widely used in fields such as automobiles, aerospace, biomedicine, and petrochemical industry. However, condensation is likely to occur on the surface of aluminum alloy. During actual use, water vapor will stay on the surface of aluminum alloy for a long time, which not only limits the application scenarios of aluminum alloy, but also greatly increases the possibility of aluminum alloy being corroded. Summary of the Invention

[0003] Based on this, it is necessary to provide a preparation method for an anti-condensation coating on the surface of aluminum alloy and an anti-condensation aluminum alloy to improve the anti-condensation performance of the aluminum alloy surface, thereby improving the service life of the aluminum alloy and broadening the application scenarios of the aluminum alloy.

[0004] In the first aspect of this application, a preparation method for an anti-condensation coating on the surface of aluminum alloy is provided.

[0005] A preparation method for an anti-condensation coating on the surface of aluminum alloy includes the following preparation steps:

[0006] Laser-treat the surface of the aluminum alloy to obtain pretreated aluminum alloy;

[0007] Place the pretreated aluminum alloy in an electrolyte for cathodic deposition, and deposit an anti-condensation coating on the surface of the pretreated aluminum alloy to obtain an anti-condensation aluminum alloy;

[0008] Among them, the components of the electrolyte include sodium tungstate, nickel sulfate, sodium citrate, and ammonium chloride;

[0009] During the cathodic deposition process, the temperature of the electrolyte is maintained at 20°C to 60°C;

[0010] The laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s to 1500 mm / s, the pulse frequency is 20 kHz to 30 kHz, and the output power is 8 W to 20 W;

[0011] The cathodic deposition satisfies the following conditions: it is carried out in a constant voltage mode, and the voltage is 120 V to 250 V.

[0012] In some embodiments, in the electrolyte, the concentration of sodium tungstate is 15 g / L to 30 g / L.

[0013] In some embodiments, in the electrolyte, the concentration of nickel sulfate is 15 g / L to 30 g / L.

[0014] In some of these embodiments, in the electrolyte, the concentration of sodium citrate is 20 g / L to 100 g / L.

[0015] In some of these embodiments, in the electrolyte, the concentration of ammonium chloride is 20 g / L to 30 g / L.

[0016] In some of these embodiments, the duty cycle of the cathode deposition is 30% to 50%.

[0017] In some of these embodiments, the frequency of the cathode deposition is 500 Hz to 700 Hz.

[0018] In some of these embodiments, the processing time of the cathode deposition is 6 min to 30 min.

[0019] In some of these embodiments, the aluminum alloy includes 6061A1 aluminum alloy.

[0020] In the second aspect of the present application, an anti-condensation aluminum alloy is provided.

[0021] An anti-condensation aluminum alloy is prepared by using the above method for preparing an anti-condensation coating on the surface of an aluminum alloy.

[0022] In the above method for preparing an anti-condensation coating on the surface of an aluminum alloy, by performing laser treatment on the aluminum alloy, a pre-treated aluminum alloy with high surface uniformity can be obtained. Furthermore, during cathode deposition, an anti-condensation coating with strong adhesion can be formed on the surface of the pre-treated aluminum alloy. Moreover, the above method for preparing an anti-condensation coating on the surface of an aluminum alloy adopts high-voltage cathode deposition, which can not only effectively improve the deposition efficiency, but also obtain a denser anti-condensation coating with a higher hydrophobic angle. At the same time, by adjusting the temperature of the electrolyte, the influence of high-voltage heat generation on the coating performance can be reduced, and finally an anti-condensation aluminum alloy with excellent anti-condensation performance can be obtained. The above method for preparing an anti-condensation coating on the surface of an aluminum alloy has the advantages of being safe, non-toxic, simple to operate, and having high production efficiency during the preparation process, and has the prospect of industrial application. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a test diagram of the surface water contact angle of the anti-condensation aluminum alloy prepared in Example 1 of the present application.

[0025] Figure 2 It is a test diagram of the surface water contact angle of the aluminum alloy of Comparative Example 7 of this application.

[0026] Figure 3 It is the performance of the anti-condensation aluminum alloy prepared in Example 1 of this application in a condensation environment.

[0027] Figure 4 It is the performance of the aluminum alloy of Comparative Example 7 of this application in a condensation environment. Detailed Description of the Invention

[0028] To make the above objects, features, and advantages of this application more obvious and understandable, the following provides a detailed description of the specific implementation manners of this application. Many specific details are set forth in the following description to facilitate a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0029] In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined. In this application, "at least one" means more than one, such as one, two, and more than two. The meaning of "a variety of" or "several" is at least two, such as two, three, etc.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] When a numerical range is disclosed herein, the above range is considered continuous and includes the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when the range refers to an integer, it includes each integer between the minimum and maximum values of the range. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.

[0032] Unless otherwise specified, all steps of this application can be carried out sequentially or randomly. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) carried out sequentially, or may include steps (b) and (a) carried out sequentially. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c) in sequence, or may include steps (a), (c), and (b), or may include steps (c), (a), and (b), etc.

[0033] In this application, "above" or "below" both include the number itself. For example, below 1 includes 1.

[0034] The temperature parameter in this application, unless otherwise specifically limited, allows both constant temperature treatment and fluctuations within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuations within ranges such as ±5°C, ±4°C, ±3°C, ±2°C, ±1°C are allowed.

[0035] Aluminum alloys have many advantages such as low density, excellent mechanical properties, and easy processing, and are now widely used in fields such as automobiles, aerospace, biomedicine, and petrochemicals. However, condensation is likely to occur on the surface of aluminum alloys. During actual use, water vapor will stay on the surface of aluminum alloys for a long time, which not only limits the application scenarios of aluminum alloys, but also greatly increases the possibility of aluminum alloys being corroded.

[0036] Based on this, in the first aspect of this application, a preparation method for an anti-condensation coating on the surface of an aluminum alloy and an anti-condensation aluminum alloy are provided to improve the anti-condensation performance of the surface of the aluminum alloy, thereby improving the service life of the aluminum alloy and broadening the application scenarios of the aluminum alloy.

[0037] In the first aspect of this application, a preparation method for an anti-condensation coating on the surface of an aluminum alloy is provided.

[0038] A preparation method for an anti-condensation coating on the surface of an aluminum alloy includes the following steps:

[0039] The surface of the aluminum alloy is subjected to laser treatment to obtain pre-treated aluminum alloy;

[0040] The pre-treated aluminum alloy is placed in an electrolyte for cathodic deposition, and an anti-condensation coating is deposited on the surface of the pre-treated aluminum alloy to obtain anti-condensation aluminum alloy;

[0041] Among them, the components of the electrolyte include sodium tungstate, nickel sulfate, sodium citrate, and ammonium chloride;

[0042] During the cathodic deposition process, the temperature of the electrolyte is maintained at 20°C to 60°C;

[0043] The laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s to 1500 mm / s, the pulse frequency is 20 kHz to 30 kHz, and the output power is 8 W to 20 W;

[0044] The cathode deposition satisfies the following conditions: it is carried out in a constant voltage mode, and the voltage is 120 V to 250 V.

[0045] In the method for preparing the anti-dew condensation coating on the surface of the above aluminum alloy, by laser-treating the aluminum alloy, a pre-treated aluminum alloy with high surface uniformity can be obtained. Then, during cathode deposition, an anti-dew condensation coating with strong adhesion can be formed on the surface of the pre-treated aluminum alloy. Moreover, the method for preparing the anti-dew condensation coating on the surface of the above aluminum alloy adopts high-voltage cathode deposition, which can not only effectively improve the deposition efficiency, but also obtain an anti-dew condensation coating that is denser and has a higher hydrophobic angle. At the same time, by adjusting the temperature of the electrolyte, the influence of heat generation under high voltage on the coating performance can be reduced, and finally an anti-dew condensation aluminum alloy with excellent anti-dew condensation performance can be obtained. The method for preparing the anti-dew condensation coating on the surface of the above aluminum alloy has the advantages of being safe, non-toxic, simple to operate, and having high production efficiency during the preparation process, and has the prospect of industrial application.

[0046] Optionally, the output power of the laser treatment can be, but is not limited to, 8 W, 10 W, 12 W, 14 W, 16 W, 18 W, 20 W or other values within the range of 8 W to 20 W. Keeping the output power of the laser treatment within the above range can reduce the melting phenomenon on the surface of the aluminum alloy and obtain a pre-treated aluminum alloy with good surface consistency. Moreover, an anti-dew condensation coating can be more easily deposited on the surface of the pre-treated aluminum alloy after laser treatment.

[0047] Optionally, the scanning rate of the laser treatment can be, but is not limited to, 1000 mm / s, 1100 mm / s, 1200 mm / s, 1300 mm / s, 1400 mm / s, 1500 mm / s or other values within the range of 1000 mm / s to 1500 mm / s. When using a low scanning rate, the heat-affected area on the surface of the sample will increase, making the surface of the pre-treated aluminum alloy less uniform. Maintaining the laser treatment within the above scanning rate range can obtain a pre-treated aluminum alloy with better surface uniformity. In the above laser treatment, the surface of the sample to be treated is scanned 1 time.

[0048] In some of the embodiments, the model of the instrument used for the laser treatment is Galvo Scanner2RC1001SYA (RC1001 outer A).

[0049] In some of the embodiments, the aluminum alloy is a disc with a diameter of 30 mm and a thickness of 5 mm. At this time, the laser treatment time is about 15 s to 30 s.

[0050] Optionally, the pulse frequency of the laser treatment can be, but is not limited to, 20 kHz, 21 kHz, 22 kHz, 23 kHz, 24 kHz, 25 kHz, 26 kHz, 27 kHz, 28 kHz, 29 kHz, 30 kHz, or other values within the range of 20 kHz to 30 kHz.

[0051] In some embodiments, a constant voltage mode is adopted for the power supply during cathode deposition.

[0052] In some embodiments, during cathode deposition, the duty cycle of the power supply is 30% - 50%, the frequency is 500 Hz - 700 Hz, and the voltage is 120 V - 250 V.

[0053] Optionally, the duty cycle during cathode deposition can be, but is not limited to, 30%, 35%, 40%, 45%, 50%, or other values within the range of 30% - 50%.

[0054] Optionally, the voltage during cathode deposition can be, but is not limited to, 120 V, 130 V, 140 V, 150 V, 160 V, 170 V, 180 V, 190 V, 200 V, 210 V, 220 V, 230 V, 240 V, 250 V, or other values within the range of 120 V - 250 V.

[0055] In some embodiments, the voltage during cathode deposition is 160 - 210 V to obtain a deposition layer with better anti - dew condensation performance.

[0056] In some embodiments, during cathode deposition, the temperature of the electrolyte is maintained at 20°C - 60°C. The cathode deposition of this application is carried out under high voltage, and the current during the cathode deposition process will also increase significantly, resulting in a sharp increase in heat generation during the cathode deposition process. If the electrolyte temperature is too high, it may cause a decrease in the adhesion of the anti - dew condensation layer during cathode deposition. Keeping the electrolyte temperature within the above range can obtain an anti - dew condensation deposition layer with excellent performance. By controlling the temperature of the electrolyte in this application, an anti - dew condensation coating with poor uniformity can be obtained.

[0057] Optionally, during cathode deposition, the temperature of the electrolyte can be, but is not limited to, 20°C, 22°C, 24°C, 27°C, 30°C, 33°C, 36°C, 39°C, 42°C, 45°C, 48°C, 51°C, 54°C, 57°C, 60°C, or other values within the range of 20°C - 60°C. Optionally, the temperature of the electrolyte can be automatically controlled by the program of the cooling device to maintain the temperature of the electrolyte during cathode deposition within the set range.

[0058] In some embodiments, the temperature of the electrolyte is 20°C - 45°C to reduce the influence of high temperature on the anti - dew condensation layer.

[0059] In some of these embodiments, the type of the aluminum alloy includes 6061A1.

[0060] In some of these embodiments, the anode during cathodic deposition includes stainless steel.

[0061] In some of these embodiments, the components of the electrolyte include sodium tungstate, nickel sulfate, sodium citrate, and ammonium chloride.

[0062] In some of these embodiments, the concentration of sodium tungstate in the electrolyte is 15 g / L to 30 g / L. Optionally, the concentration of sodium tungstate can be, but is not limited to, 15 g / L, 17 g / L, 19 g / L, 21 g / L, 23 g / L, 25 g / L, 27 g / L, 29 g / L, 30 g / L, or other values within the range of 15 g / L to 30 g / L.

[0063] In some of these embodiments, the concentration of nickel sulfate in the electrolyte is 15 g / L to 30 g / L. Optionally, the concentration of nickel sulfate can be, but is not limited to, 15 g / L, 17 g / L, 19 g / L, 21 g / L, 23 g / L, 25 g / L, 27 g / L, 29 g / L, 30 g / L, or other values within the range of 15 g / L to 30 g / L.

[0064] In some of these embodiments, the concentration of sodium citrate in the electrolyte is 20 g / L to 100 g / L. Optionally, the concentration of sodium citrate can be, but is not limited to, 20 g / L, 30 g / L, 40 g / L, 50 g / L, 60 g / L, 70 g / L, 80 g / L, 90 g / L, 100 g / L, or other values within the range of 20 g / L to 100 g / L.

[0065] In some of these embodiments, the concentration of ammonium chloride in the electrolyte is 20 g / L to 30 g / L. Optionally, the concentration of ammonium chloride can be, but is not limited to, 21 g / L, 22 g / L, 23 g / L, 24 g / L, 25 g / L, 26 g / L, 27 g / L, 28 g / L, 29 g / L, 30 g / L, or other values within the range of 20 g / L to 30 g / L.

[0066] In some of these embodiments, the components of the electrolyte include 15 g / L to 30 g / L of sodium tungstate, 15 g / L to 30 g / L of nickel sulfate, 20 g / L to 100 g / L of sodium citrate, and 20 g / L to 30 g / L of ammonium chloride. Keeping the electrolyte used for cathodic deposition within the above components and their contents can generate an anti-condensation layer with a low friction coefficient and strong hydrophobicity on the surface of the pretreated aluminum alloy.

[0067] Optionally, the frequency during cathode deposition can be, but is not limited to, 500 Hz, 550 Hz, 600 Hz, 650 Hz, 700 Hz, or other values within the range of 500 Hz to 700 Hz.

[0068] In some of these embodiments, the processing time for cathode deposition is 6 min to 30 min. It can be, but is not limited to, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, 20 min, 22 min, 24 min, 26 min, 28 min, 30 min, or other values within the range of 6 min to 30 min. The cathode deposition of the present application can be carried out under high pressure, thus having a high deposition efficiency.

[0069] In some of these embodiments, the anti-condensation aluminum alloy prepared by the above method for preparing an anti-condensation coating on the surface of an aluminum alloy is ultrasonically cleaned, and the surface of the wear-resistant stainless steel is cleaned successively with deionized water and acetone.

[0070] In the second aspect of the present application, an anti-condensation aluminum alloy is provided. The anti-condensation aluminum alloy is prepared by the above method for preparing an anti-condensation coating on the surface of an aluminum alloy.

[0071] In some of these embodiments, the surface water contact angle of the anti-condensation aluminum alloy is 120° to 152°. The surface of the anti-condensation aluminum alloy of the present application has a high surface water contact angle and can exhibit excellent anti-surface condensation ability in a condensation environment.

[0072] The following further describes the present application in detail with specific examples.

[0073] In the following specific examples and comparative examples, the raw materials used, unless otherwise specified, are all commercially available products; the instruments used, unless otherwise specified, are all commercially available products; the processes used, unless otherwise specified, are the conventional selections of those skilled in the art.

[0074] Example 1

[0075] This example provides an anti-condensation aluminum alloy. Figure 1 This is the test chart of the surface water contact angle of the anti-condensation aluminum alloy of this example. Figure 3 This is the performance of the anti-condensation aluminum alloy of this example after being placed in a condensation environment for three minutes.

[0076] The preparation steps of the anti-condensation aluminum alloy are as follows:

[0077] The surface of 6061A1 aluminum alloy is laser-treated to obtain a pretreated aluminum alloy;

[0078] Place the pretreated aluminum alloy in the electrolyte as the cathode, use stainless steel as the anode, and perform cathodic deposition on the pretreated aluminum alloy to deposit an anti-dew condensation coating on the surface of the pretreated aluminum alloy, obtaining an anti-dew condensation aluminum alloy;

[0079] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0080] The preparation method of the electrolyte is as follows: Dissolve 15 g of sodium tungstate, 15 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride in 1 L of deionized water, and mix well to obtain the electrolyte.

[0081] The cathodic deposition satisfies the following conditions: the duty cycle is 40%, the frequency is 600 Hz, the voltage is 200 V, for 10 min, and the temperature of the electrolyte is maintained at 25 °C through a cooling device.

[0082] Example 2

[0083] This example provides an anti-dew condensation aluminum alloy.

[0084] The preparation steps of the anti-dew condensation aluminum alloy are as follows:

[0085] Perform laser treatment on the surface of 6061A1 aluminum alloy to obtain a pretreated aluminum alloy;

[0086] Place the pretreated aluminum alloy in the electrolyte as the cathode, use stainless steel as the anode, and perform cathodic deposition on the pretreated aluminum alloy to deposit an anti-dew condensation coating on the surface of the pretreated aluminum alloy, obtaining an anti-dew condensation aluminum alloy;

[0087] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0088] The preparation method of the electrolyte is as follows: Dissolve 30 g of sodium tungstate, 30 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride in 1 L of deionized water, and mix well to obtain the electrolyte.

[0089] The cathodic deposition satisfies the following conditions: the duty cycle is 40%, the frequency is 600 Hz, the voltage is 200 V, for 10 min, and the temperature of the electrolyte is maintained at 25 °C through a cooling device.

[0090] Example 3

[0091] This example provides an anti-dew condensation aluminum alloy.

[0092] The preparation steps of the anti-dew condensation aluminum alloy are as follows:

[0093] The surface of 6061A1 aluminum alloy is subjected to laser treatment to obtain pretreated aluminum alloy;

[0094] The pretreated aluminum alloy is placed in an electrolyte and used as the cathode, and stainless steel is used as the anode. Cathodic deposition is carried out on the pretreated aluminum alloy, and an anti-dew condensation coating is deposited on the surface of the pretreated aluminum alloy to obtain anti-dew condensation aluminum alloy;

[0095] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0096] The preparation method of the electrolyte is as follows: 40 g of sodium tungstate, 40 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride are dissolved in 1 L of deionized water and mixed thoroughly to obtain the electrolyte.

[0097] The cathodic deposition satisfies the following conditions: the duty cycle is 40%, the frequency is 600 Hz, the voltage is 200 V, and it lasts for 10 min. The temperature of the electrolyte is maintained at 25 °C through a cooling device.

[0098] Example 4

[0099] This example provides an anti-dew condensation aluminum alloy.

[0100] The preparation steps of the anti-dew condensation aluminum alloy are as follows:

[0101] The surface of 6061A1 aluminum alloy is subjected to laser treatment to obtain pretreated aluminum alloy;

[0102] The pretreated aluminum alloy is placed in an electrolyte and used as the cathode, and stainless steel is used as the anode. Cathodic deposition is carried out on the pretreated aluminum alloy, and an anti-dew condensation coating is deposited on the surface of the pretreated aluminum alloy to obtain anti-dew condensation aluminum alloy;

[0103] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0104] The preparation method of the electrolyte is as follows: 15 g of sodium tungstate, 15 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride are dissolved in 1 L of deionized water and mixed thoroughly to obtain the electrolyte.

[0105] The cathodic deposition satisfies the following conditions: the duty cycle is 40%, the frequency is 600 Hz, the voltage is 150 V, and it lasts for 10 min. The temperature of the electrolyte is maintained at 25 °C through a cooling device.

[0106] Example 5

[0107] This example provides an anti-dew condensation aluminum alloy.

[0108] The preparation steps of the anti-dew condensation aluminum alloy are as follows:

[0109] The surface of 6061A1 aluminum alloy is subjected to laser treatment to obtain a pretreated aluminum alloy;

[0110] The pretreated aluminum alloy is placed in an electrolyte solution and used as the cathode, and stainless steel is used as the anode. Cathodic deposition is carried out on the pretreated aluminum alloy, and an anti-dew condensation coating is deposited on the surface of the pretreated aluminum alloy to obtain an anti-dew condensation aluminum alloy;

[0111] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0112] The preparation method of the electrolyte solution is as follows: 15 g of sodium tungstate, 15 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride are dissolved in 1 L of deionized water and mixed thoroughly to obtain the electrolyte solution.

[0113] The cathodic deposition satisfies the following conditions: the duty cycle is 40%, the frequency is 600 Hz, the voltage is 250 V, for 10 min, and the temperature of the electrolyte solution is maintained at 25 °C through a cooling device.

[0114] Example 6

[0115] This example provides an anti-dew condensation aluminum alloy.

[0116] The preparation steps of the anti-dew condensation aluminum alloy are as follows:

[0117] The surface of 6061A1 aluminum alloy is subjected to laser treatment to obtain a pretreated aluminum alloy;

[0118] The pretreated aluminum alloy is placed in an electrolyte solution and used as the cathode, and stainless steel is used as the anode. Cathodic deposition is carried out on the pretreated aluminum alloy, and an anti-dew condensation coating is deposited on the surface of the pretreated aluminum alloy to obtain an anti-dew condensation aluminum alloy;

[0119] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0120] The preparation method of the electrolyte solution is as follows: 15 g of sodium tungstate, 15 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride are dissolved in 1 L of deionized water and mixed thoroughly to obtain the electrolyte solution.

[0121] The cathodic deposition satisfies the following conditions: the duty cycle is 60%, the frequency is 600 Hz, the voltage is 200 V, for 10 min, and the temperature of the electrolyte solution is maintained at 25 °C through a cooling device.

[0122] Example 7

[0123] This example provides an anti-dew condensation aluminum alloy.

[0124] The preparation steps of the anti-condensation aluminum alloy are as follows:

[0125] The surface of 6061A1 aluminum alloy is subjected to laser treatment to obtain a pretreated aluminum alloy;

[0126] The pretreated aluminum alloy is placed in an electrolyte and used as the cathode, and stainless steel is used as the anode. The pretreated aluminum alloy is subjected to cathodic deposition to deposit an anti-condensation coating on the surface of the pretreated aluminum alloy, obtaining an anti-condensation aluminum alloy;

[0127] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0128] The preparation method of the electrolyte is as follows: Dissolve 5 g of sodium tungstate, 5 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride in 1 L of deionized water, and mix well to obtain the electrolyte.

[0129] The cathodic deposition satisfies the following conditions: the duty cycle is 40%, the frequency is 600 Hz, the voltage is 200 V, for 10 min, and the temperature of the electrolyte is maintained at 25 °C through a cooling device.

[0130] Comparative Example 1

[0131] This comparative example provides an anti-condensation aluminum alloy.

[0132] The preparation steps of the anti-condensation aluminum alloy are as follows:

[0133] The surface of 6061A1 aluminum alloy is subjected to laser treatment to obtain a pretreated aluminum alloy;

[0134] The pretreated aluminum alloy is placed in an electrolyte and used as the cathode, and stainless steel is used as the anode. The pretreated aluminum alloy is subjected to cathodic deposition to deposit an anti-condensation coating on the surface of the pretreated aluminum alloy, obtaining an anti-condensation aluminum alloy;

[0135] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0136] The preparation method of the electrolyte is as follows: Dissolve 30 g of sodium tungstate, 20 g of sodium citrate, and 20 g of ammonium chloride in 1 L of deionized water, and mix well to obtain the electrolyte.

[0137] The cathodic deposition satisfies the following conditions: the duty cycle is 40%, the frequency is 600 Hz, the voltage is 200 V, for 10 min, and the temperature of the electrolyte is maintained at 25 °C through a cooling device.

[0138] Comparative Example 2

[0139] This comparative example provides an anti-condensation aluminum alloy.

[0140] The preparation steps of the anti-condensation aluminum alloy are as follows:

[0141] The surface of 6061A1 aluminum alloy is subjected to laser treatment to obtain a pretreated aluminum alloy;

[0142] The pretreated aluminum alloy is placed in an electrolyte and used as the cathode, and stainless steel is used as the anode. The pretreated aluminum alloy is subjected to cathodic deposition, and an anti-condensation coating is deposited on the surface of the pretreated aluminum alloy to obtain an anti-condensation aluminum alloy;

[0143] Among them, the laser treatment satisfies the following conditions: the scanning rate is 1000 mm / s, the pulse frequency is 20 kHz, and the output power is 10 W.

[0144] The preparation method of the electrolyte is as follows: 30 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride are dissolved in 1 L of deionized water and mixed thoroughly to obtain the electrolyte.

[0145] The cathodic deposition satisfies the following conditions: the duty cycle is 40%, the frequency is 600 Hz, the voltage is 200 V, for 10 min, and the temperature of the electrolyte is maintained at 25 °C through a cooling device.

[0146] Comparative Example 3

[0147] This comparative example provides an anti-condensation aluminum alloy.

[0148] The preparation method of the anti-condensation aluminum alloy in this comparative example is basically the same as that of Example 1, except that: the voltage of the cathodic deposition is 100 V.

[0149] Comparative Example 4

[0150] This comparative example provides an anti-condensation aluminum alloy.

[0151] The preparation method of the anti-condensation aluminum alloy in this comparative example is basically the same as that of Example 1, except that: during the cathodic deposition process, the temperature of the electrolyte is not controlled, the initial temperature of the electrolyte is 25 °C, and the final temperature is 77 °C.

[0152] Comparative Example 5

[0153] This comparative example provides an anti-condensation aluminum alloy.

[0154] The preparation steps of the anti-condensation aluminum alloy are as follows:

[0155] 6061A1 aluminum alloy is placed in an electrolyte and used as the cathode, and stainless steel is used as the anode. The aluminum alloy is subjected to cathodic deposition, and an anti-condensation coating is deposited on the aluminum alloy to obtain an anti-condensation aluminum alloy;

[0156] Among them, the preparation method of the electrolyte is as follows: Dissolve 15 g of sodium tungstate, 15 g of nickel sulfate, 20 g of sodium citrate, and 20 g of ammonium chloride in 1 L of deionized water, and mix well to obtain the electrolyte.

[0157] The cathode deposition satisfies the following conditions: duty cycle 40%, frequency 600 Hz, voltage 200 V, duration 10 min, and electrolyte temperature 25°C.

[0158] Comparative Example 6

[0159] This comparative example provides a pretreated aluminum alloy.

[0160] The preparation steps of the pretreated aluminum alloy are as follows:

[0161] Perform laser treatment on the surface of 6061A1 aluminum alloy to obtain the pretreated aluminum alloy;

[0162] Among them, the laser treatment satisfies the following conditions: scanning rate 1000 mm / s, pulse frequency 20 kHz, and output power 10 W.

[0163] Comparative Example 7

[0164] This comparative example provides a 6061A1 aluminum alloy. Figure 2 This is the test chart of the surface water contact angle of the aluminum alloy in this comparative example. Figure 4 This is the performance of the aluminum alloy in this comparative example after being placed in a dew condensation environment for three minutes.

[0165] Test Example

[0166] Perform friction experiments (reciprocating friction machine test), friction coefficient (dry friction environment), and water contact angle tests on the samples obtained in Examples 1-7 and Comparative Examples 1-7. The test results are shown in Table 1.

[0167] Table 1 Performance test results of aluminum alloy products obtained in each example and comparative example

[0168]

[0169] As can be seen from Table 1, when the electrolyte temperature is not controlled, the performance of the obtained anti-dew condensation aluminum alloy is poor, which may be due to the decrease in the adhesion of the anti-dew condensation coating caused by high temperature. In addition, when the voltage is too high, the performance of the coating will also decrease, which may be caused by excessive local heat generation leading to melting of the aluminum alloy surface. In summary, the anti-dew condensation aluminum alloy prepared by the preparation method of the anti-dew condensation coating on the aluminum alloy surface of the present application has good mechanical properties and better surface hydrophobic performance, and is more suitable for the application environment of dew condensation compared with ordinary aluminum alloys.

[0170] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0171] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the invention patent should be subject to the appended claims, and the specification can be used to explain the content of the claims.

Claims

1. A method for preparing an anti-condensation coating on an aluminum alloy surface, characterized in that: The following steps are involved: Laser treatment is performed on the surface of the aluminum alloy to obtain a pretreated aluminum alloy; Placing the pretreated aluminum alloy in an electrolyte for cathode deposition, depositing an anti-condensation coating on the surface of the pretreated aluminum alloy to obtain an anti-condensation aluminum alloy; Wherein, the components of the electrolyte include sodium tungstate, nickel sulfate, sodium citrate and ammonium chloride; During the cathode deposition process, the temperature of the electrolyte is maintained at 20°C to 60°C; The laser treatment meets the following conditions: scanning rate is 1000mm / s~1500mm / s, pulse frequency is 20kHz~30kHz, output power is 8W~20W; The cathode deposition satisfies the following conditions: it is carried out in a constant voltage mode with a voltage of 150V to 250V.

2. The method for preparing an anti-condensation coating on an aluminum alloy surface according to claim 1, characterized in that: In the electrolyte, the concentration of sodium tungstate is 15 g / L to 30 g / L.

3. The method for preparing an anti-condensation coating on an aluminum alloy surface according to claim 1, characterized in that: In the electrolyte, the concentration of nickel sulfate is 15g / L~30g / L.

4. The method for preparing an anti-condensation coating on an aluminum alloy surface according to claim 1, characterized in that: In the electrolyte, the concentration of sodium citrate is 20 g / L to 100 g / L.

5. The method for preparing an anti-condensation coating on an aluminum alloy surface according to claim 1, characterized in that: In the electrolyte, the concentration of ammonium chloride is 20 g / L to 30 g / L.

6. The method for preparing an anti-condensation coating on an aluminum alloy surface according to any one of claims 1 to 5, characterized in that: The duty cycle of the cathode deposition is 30% to 50%.

7. The method for preparing an anti-condensation coating on an aluminum alloy surface according to any one of claims 1 to 5, characterized in that: The frequency of the cathode deposition is 500 Hz to 700 Hz.

8. The method for preparing an anti-condensation coating on an aluminum alloy surface according to any one of claims 1 to 5, characterized in that: The cathode deposition treatment time is 6 min to 30 min.

9. The method for preparing an anti-condensation coating on an aluminum alloy surface according to any one of claims 1 to 5, characterized in that: The aluminum alloy includes 6061A1 aluminum alloy.

10. An anti-condensation aluminum alloy, characterized in that: The anti-condensation coating on the surface of an aluminum alloy is prepared by the method for preparing the anti-condensation coating on the surface of an aluminum alloy as described in any one of claims 1 to 9.

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