Surface treatment method of a liquid reservoir

Abstract

The present invention discloses a surface treatment method for a liquid storage device. The liquid storage device includes a tank body with an inner cavity, the tank body has an inlet hole and an outlet hole, and the surface treatment method includes the following steps: filling the tank body with gas to form a positive pressure in the inner cavity of the tank body; sealing the inlet hole and the outlet hole; cleaning the tank body with pure water; immersing the tank body in an acid solution at a set temperature and a set concentration, and passing a current with a set density for anodic oxidation treatment to form an oxide film on the surface of the tank body; cleaning the tank body after anodic oxidation treatment; and curing the tank body. This surface treatment method has a relatively low cost and a relatively low thermal impact on the internal parts of the liquid storage device, the oxidation effect of the tank body is good, and the appearance presents a perfect metallic color.

Description

Technical Field

[0001] The invention relates to the technical field of liquid reservoirs, and in particular to a surface treatment method for a liquid reservoir. Background Art

[0002] The liquid receiver is one of the important parts in the automobile air-conditioning system. Its main functions are to store medium, filter impurities and separate gas and liquid.

[0003] At present, the requirements for the corrosion resistance of liquid storage tanks are getting higher and higher. Simply relying on improving the corrosion resistance of the base material itself can no longer meet customer needs.

[0004] At present, the corrosion resistance of the liquid reservoir is mainly improved by spraying paint or powder on the surface. The spraying paint or powder spraying method requires multiple spraying treatments, and each spraying needs to be dried and cured. The drying and curing temperature is high (close to 200°C), which is easy to cause thermal effects on the internal parts of the liquid reservoir. In addition, the spraying paint or powder spraying method requires multiple spraying treatments, more processes, and higher costs. Summary of the invention

[0005] The object of the present invention is to provide a surface treatment method for a liquid reservoir, which method has low cost and low thermal influence on the internal parts of the liquid reservoir.

[0006] In order to solve the above technical problems, the present invention provides a surface treatment method for a liquid reservoir, wherein the liquid reservoir comprises a tank body having an inner cavity, wherein the tank body has an inlet hole and an outlet hole, and the surface treatment method comprises the following steps:

[0007] Filling the tank with gas to form a positive pressure in the tank cavity; sealing the inlet hole and the outlet hole;

[0008] Cleaning the tank with pure water;

[0009] The tank body is immersed in an acid solution of a set temperature and a set concentration, and an electric current of a set density is passed through the tank body for anodizing treatment to form an oxide film on the surface of the tank body;

[0010] Cleaning the tank after anodizing treatment;

[0011] The can body is cured.

[0012] The surface treatment method of the liquid storage container provided by the above technical solution forms an oxide film on the surface of the tank body of the liquid storage container by means of anodic oxidation. Among them, before the anodic oxidation treatment, gas is first filled into the tank body to form a positive pressure, which can prevent liquid from entering the interior of the tank body during oxidation and avoid damage to the relevant components inside the tank body. This method can perform anodic oxidation treatment on the surface of the entire tank body on the basis of ensuring the internal protection of the tank body, form an oxide film with stable corrosion resistance, and can reduce the thermal influence of the internal parts caused by the high-temperature treatment of the tank body by painting or powder spraying in the background. The overall corrosion resistance of the tank body is improved, the process cost is low, and the appearance presents a perfect metallic color. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic flow chart of the first embodiment of the surface treatment method of the liquid storage container provided by the present invention;

[0014] Figure 2 Schematic flow chart of the second embodiment of the surface treatment method of the liquid storage container provided by the present invention;

[0015] Figure 3 Schematic flow chart of the third embodiment of the surface treatment method of the liquid storage container provided by the present invention;

[0016] Figure 4 Schematic perspective view of an embodiment of the clamping device;

[0017] Figure 5 is Figure 4 Schematic perspective view of the clamping member shown;

[0018] Figure 6 is Figure 5 Schematic left view of the clamping member shown;

[0019] Figure 7 Schematic perspective view of the assembly of the clamping member and the liquid storage container;

[0020] Figure 8 Schematic right view of the assembly of the liquid storage container and the clamping member in another embodiment;

[0021] Figure 9 Schematic right view of the clamping device in an embodiment;

[0022] Figure 10 is Figure 9 Schematic top view of the clamping device shown;

[0023] Figure 11 Schematic perspective view of the clamping member in another embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Please refer to Figure 1 , Figure 1 which is a schematic flow chart of the first embodiment of the surface treatment method for the liquid storage container provided by the present invention.

[0026] The liquid storage container includes a tank body with an inner cavity. The tank body is usually made of aluminum alloy and is provided with an inlet hole and an outlet hole. The tank body usually also has relevant pipe fittings or filtering components and other liquid storage devices.

[0027] In this embodiment, the surface treatment method of the liquid storage container includes the following steps:

[0028] Fill the inner cavity of the tank body of the liquid storage container with gas to form a positive pressure, and seal the inlet hole and the outlet hole of the tank body;

[0029] In this way, the tank body can be sealed, and because its inner cavity is filled with gas to form a positive pressure, during subsequent processes such as cleaning and anodic oxidation, liquid can be prevented from entering the inside of the tank body and affecting the various liquid storage devices inside the tank body.

[0030] Specifically, the gas filled into the tank body is nitrogen, which has a low cost.

[0031] Specifically, the inlet hole and the outlet hole of the tank body can be sealed with a sealing plug, and the sealing plug can be a special sealing plug for the liquid storage container.

[0032] Clean the tank body with pure water;

[0033] Immerse the tank body in an acid solution at a set temperature and a set concentration, and pass a current with a set density for anodic oxidation treatment to form an oxide film on the surface of the tank body;

[0034] As described above, pure water refers to water without impurities such as distilled water. Before performing anodic oxidation treatment on the tank body, first clean the tank body with pure water. Obviously, it is to clean the outer surface of the tank body, which can prevent dust and other impurities on the outer surface of the tank body, remove the impurity residues in other solutions before anodic oxidation treatment, and prevent these impurities from affecting the effect of anodic oxidation treatment.

[0035] Specifically, the surface of the tank body can be rinsed with pure water. Of course, the tank body can also be soaked in pure water first and then rinsed. No matter which cleaning method is adopted, as long as the floating dust or other impurities on the surface of the tank body can be removed. In practical applications, the rinsing duration can be selected according to the cleanliness of the surface of the tank body, such as 50 to 70 seconds.

[0036] It should be noted that before anodic oxidation, cleaning the tank body with pure water, on the basis of removing the floating dust on the surface of the tank body, the pure water contains no impurities and will not affect the subsequent anodic oxidation.

[0037] During anodic oxidation, the acid solution can be a sulfuric acid solution with a temperature of 13 - 30°C and a concentration of 120 - 190 g / L, and a current with a density of 0.7 - 1.8 A / dm 2 is passed; alternatively, the acid solution can also be a phosphoric acid solution with a temperature of 18 - 20°C and a concentration of 250 - 340 g / L, and the current density passed is specifically 1.2 - 1.8 A / dm 2 .

[0038] Clean the tank body after anodic oxidation treatment;

[0039] Cure the tank body. Place the tank body after anodic oxidation cleaning in an environment with a temperature of 94 - 101°C, and keep it in the set water environment for 1070 - 1100 s for curing. Curing can make the oxide film after oxidation more stable, not easy to fall off, and the appearance presents a perfect metallic color.

[0040] After cleaning the anodic oxidation tank body, first rinse the tank body with tap water, then spray the tank body with tap water with a pH > 6. Specifically, the tank body can be sprayed through a nozzle to remove the residual liquid, and finally clean the tank body with pure water with a pH > 5 more than once.

[0041] Specifically, according to needs, the tank body can be cleaned with pure water with a pH > 5 more than twice to ensure that there is no residual liquid left on the surface of the tank body.

[0042] Specifically, the cleaning duration of each step can be determined according to needs. For example, in a specific application example, first rinse with tap water for 16 seconds, then spray the tank body with tap water with a pH > 6 for about 330 seconds, and finally rinse the tank body with pure water with a pH > 5 twice, each time reaching 10 seconds.

[0043] Selecting tap water or pure water with the above pH values can avoid affecting the formed oxide film during cleaning.

[0044] Among them, specifically, the cleaned tank body can be cured first, and then placed in an environment of 110 - 160°C and kept for 700 - 730 seconds to complete drying.

[0045] Specifically, after forming an oxide film on the surface of the tank body, the tank body is then cured to stabilize the oxide film. After curing, it is dried to remove residual water in the tank body, etc. The drying temperature is 140-160°C, which is significantly lower than the drying temperature required for methods such as powder spraying or painting (about 200°C). Reducing the need for drying and curing every time powder spraying or painting is used is likely to have a thermal impact on the inside of the liquid storage device, resulting in a relatively high defective rate of the liquid storage device. In addition, since it is easy to have deviations when detecting the internal temperature of the liquid storage device through a temperature sensor, and the drying temperature required for methods such as powder spraying or painting is very high, close to 200°C. Once the actual internal temperature of the liquid storage device exceeds 200°C, the components inside the liquid storage device will be damaged, leading to a relatively high defective rate of the liquid storage device.

[0046] It can be understood that the specific ambient temperature and drying duration during drying can be determined according to requirements and are not limited to the above.

[0047] As described above, the surface treatment method of the liquid storage device provided in this embodiment forms an oxide film on the surface of the tank body of the liquid storage device by means of anodic oxidation. Among them, before the anodic oxidation treatment, gas is first filled into the tank body to form a positive pressure, which can prevent liquid from entering the inside of the tank body during oxidation and avoid damage to the relevant components inside the tank body. This method can perform anodic oxidation treatment on the surface of the entire tank body on the basis of ensuring the internal protection of the tank body, forming an oxide film with stable corrosion resistance and low cost; at the same time, because the entire treatment process is carried out at a relatively low temperature, for example, not exceeding 160°C, which is significantly lower than 200°C, the defective rate is significantly reduced compared with methods such as powder spraying, and the situation where the filtration accuracy of the liquid storage device inside the tank body is reduced due to the heat influence is also reduced.

[0048] Put the cleaned tank body into tap water at a predetermined temperature and keep it for a predetermined time to cure the oxide film.

[0049] Specifically, in order to cure the oxide film, the temperature of the tap water is set relatively high. The predetermined temperature can be selected within the range of 94-101°C, and the above-mentioned predetermined time can specifically be 1070-1100 seconds.

[0050] In actual application, the predetermined temperature and predetermined time can be specifically set according to requirements and are not limited to the above.

[0051] This embodiment specifically targets a liquid storage device with a very clean tank body surface. Before anodic oxidation, only floating ash needs to be removed with pure water; in actual application, the liquid storage device may have been used or stored for a period of time, and natural oxides, etc. exist on the surface of its tank body. At this time, before anodic oxidation, cleaning pretreatment is also required to make the tank body surface clean.

[0052] Please refer to Figure 2 , Figure 2Schematic flow chart of the second embodiment of the surface treatment method for the liquid storage container provided by the present invention.

[0053] In this embodiment, the surface treatment method for the liquid storage container includes the following steps:

[0054] Fill the inner cavity of the liquid storage container with gas to form a positive pressure inside, and seal the inlet hole and outlet hole of the container body;

[0055] For the specific implementation of this step, reference can be made to the steps of the previous embodiment, which will not be repeated here.

[0056] Perform alkaline etching treatment on the surface of the container body;

[0057] There may be residues on the metal surface of the container body of the liquid storage container, such as a natural oxide film. Therefore, it is necessary to remove the residues in advance to expose a clean metal matrix and prepare for the subsequent formation of a uniform oxide film.

[0058] Specifically, the alkaline etching treatment includes the following steps:

[0059] Immerse the container body in an alkaline solution for a preset time in an environment with a preset temperature;

[0060] In a specific solution, the alkaline solution can be selected from sodium hydroxide solution, potassium hydroxide solution, calcium hydroxide solution, etc.

[0061] According to the situation of the residues on the outer surface of the container body, the specific value of the preset temperature, the concentration of the alkaline solution, the soaking duration, etc. can be specifically set.

[0062] For example, in a specific example, the container body can be immersed in a sodium hydroxide solution with a concentration of 30 - 100 g / L and a sodium gluconate with a concentration of 8 - 15 g / L for 40 seconds in an environment with a preset temperature of 50 ± 5 °C.

[0063] For example, in another specific example, the container body can be immersed in a potassium hydroxide solution with a concentration of 60 - 120 g / L and a sodium gluconate with a concentration of 8 - 15 g / L for 40 seconds in an environment with a preset temperature of 60 ± 5 °C.

[0064] First, rinse with water at 55 ± 15 °C for a first set time, and then rinse with water for a second set time.

[0065] After removing the residues on the surface of the container body, first rinse the container body with water at a relatively high temperature, and then rinse the container body with water for a second time to remove the residual liquid remaining on the surface of the container body during the alkaline etching treatment.

[0066] The water for rinsing can specifically be tap water.

[0067] The duration of rinsing the container body twice can be determined as needed. For example, each time can be rinsed for 10 seconds.

[0068] After rinsing, perform brightening treatment on the surface of the tank body.

[0069] After performing alkaline etching treatment on the surface of the tank body, some substances in the alloy material such as iron, manganese, copper, magnesium, etc. that are insoluble in alkali will remain on the surface of the workpiece, forming a layer of loose grayish-black substance, which affects the subsequent process and needs to be removed. The removal method can be manual wiping, but the efficiency is low and the effect is poor. Therefore, in this solution, the chemical solution method, that is, the so-called brightening, can be used for brightening treatment, which can make the surface of the aluminum alloy tank body present a crystalline structure with metallic luster and make it fully activated, and can also neutralize the residual alkali solution after alkaline etching.

[0070] Specifically, the brightening treatment includes the steps of:

[0071] Immerse the tank body in an acidic solution for a preset time;

[0072] In a specific solution, the acidic solution can be selected from nitric acid, sulfuric acid, acetic acid, phosphoric acid, etc.

[0073] According to the situation of the surface of the tank body after alkaline etching treatment, an appropriate concentration of acid solution and soaking time can be selected.

[0074] For example, in a specific example, nitric acid with a concentration of 130 - 470 g / L can be selected and soaked for 330 - 3360 seconds; in another specific example, phosphoric acid with a concentration of 220 - 550 g / L can be selected and soaked for 400 - 430 seconds.

[0075] Rinse the tank body with water for a first set time, and then spray the tank body with water for a second set time.

[0076] After removing the loose substance on the surface of the tank body, first rinse the tank body with water, and then spray the tank body with water to remove the residual liquid on the surface of the tank body.

[0077] The water for rinsing or spraying can be tap water.

[0078] Wash the tank body with pure water;

[0079] Specifically, after performing alkaline etching and brightening treatment on the surface of the tank body, the surface of the tank body is also washed with pure water to further remove the residual liquid on the surface of the tank body and avoid affecting the subsequent anodizing treatment process.

[0080] Compared with the foregoing embodiments, since alkaline etching and brightening treatment are performed on the surface of the tank body before washing with pure water, at this time, the time for washing the surface of the tank body with pure water can be appropriately extended to ensure the cleanliness of the surface of the tank body.

[0081] Specifically, it can be rinsed with pure water for 70 - 90 seconds.

[0082] Immerse the tank body in an acid solution with a set temperature and a set concentration, and apply an anodic oxidation treatment with a set density of current to form an oxide film on the surface of the tank body;

[0083] Clean the tank body after the anodic oxidation treatment;

[0084] Put the cleaned tank body into tap water at a predetermined temperature and keep it for a predetermined time;

[0085] Dry the tank body.

[0086] For the specific implementation of the above steps, reference can be made to the steps of the previous embodiment, which will not be repeated here.

[0087] In practical applications, there may be oil and natural oxides on the surface of the tank body of the liquid storage device. At this time, it is also necessary to perform a cleaning pretreatment on the tank body to make the surface of the tank body clean.

[0088] Please refer to Figure 3 , Figure 3 , which is a schematic flow chart of the third embodiment of the surface treatment method of the liquid storage device provided by the present invention.

[0089] In this example, the surface treatment method of the liquid storage device includes the following steps:

[0090] Fill the tank body of the liquid storage device with gas to form a positive pressure in its inner cavity, and seal the inlet hole and the outlet hole of the tank body;

[0091] Perform degreasing treatment on the surface of the tank body;

[0092] The surface of the tank body of the liquid storage device may contain oil. At this time, it is necessary to remove the oil first before performing other cleaning.

[0093] Specifically, the degreasing treatment includes the steps of:

[0094] Immerse the tank body in a degreasing agent for a first preset time, wherein the pH value of the degreasing agent is 8.0 - 11.0 and the temperature is 60 ± 10 °C;

[0095] During specific operation, the first preset time can be selected according to needs.

[0096] At the same time, according to needs, the tank body can be immersed in the degreasing agent more than once. For example, in a specific example, it can be immersed in the degreasing agent for 270 - 300 seconds for the first degreasing, and then immersed in the degreasing agent for 330 - 360 seconds for the second degreasing. Among them, the degreasing agents selected for several degreasings can be the same or different, and the immersion duration for each degreasing is selected according to needs.

[0097] Rinse the tank body with water for a second preset time.

[0098] During specific operations, tap water can be selected for rinsing. It can be rinsed only once or more than twice according to needs, and the duration of each rinsing is set according to needs.

[0099] Perform alkaline etching treatment on the surface of the tank body;

[0100] Perform brightening treatment on the surface of the tank body;

[0101] Clean the tank body with pure water;

[0102] Immerse the tank body in an acid solution with a set temperature and set concentration, and pass a current with a set density for anodic oxidation treatment to form an oxide film on the surface of the tank body;

[0103] Clean the tank body after anodic oxidation treatment;

[0104] Put the cleaned tank body into tap water at a predetermined temperature and keep it for a predetermined time;

[0105] Dry the tank body.

[0106] The above steps can refer to the steps of the aforementioned second embodiment and the first embodiment, and will not be repeated here.

[0107] In addition, during the pre-cleaning treatment and anodic oxidation treatment of the tank body, a clamping device needs to be used. Using the clamping device, the tank body is assembled to the clamping device with the head facing up. The clamping device includes a bracket and at least one clamping member. The head end of the tank body is limited to the top section of the clamping member, and the bottom end of the tank body is limited to the bottom section of the clamping member. Clean the tank body with pure water, and immerse the clamping member holding the tank body into an acid solution with a set temperature and set concentration.

[0108] Since anodic oxidation treatment needs to be performed on the whole body of the tank body, if the clamping device is not used, the tank body can only be thrown into the solution as a whole, or other equipment is used, which cannot ensure that as much surface of the tank body as possible has an oxide film, and will affect the uniformity and integrity of the film on the surface of the tank body. At the same time, with the head of the tank body facing up, the inlet hole and outlet hole of the tank body are located at the head, which helps to seal the inlet hole and outlet hole.

[0109] Specifically, the clamping device used will be described in detail below.

[0110] Please refer to Figures 4 - 7 As shown, a clamping device 100 includes a bracket 1 and at least one clamping member 2. The clamping member 2 is fixedly arranged with the bracket 1. The clamping member 2 includes a top section 21, a middle section 22 and a bottom section 23. The top section 21 is bent relative to the middle section 22, and the bottom section 23 is bent relative to the middle section 22.

[0111] The top section 21 has a first limiting portion 211, and the bottom section 23 has a second limiting portion 231. The second limiting portion 231 faces the top section 21. Along the axial direction of the clamping member 2, at least part of the first limiting portion 211 is disposed opposite to the second limiting portion 231 and / or the center line of the first limiting portion 211 is disposed opposite to the second limiting portion 231, so that the liquid reservoir can be limited between the first limiting portion 211 and the second limiting portion 231.

[0112] Wherein, Figure 5 the Y direction is the axial direction of the clamping member 2. When the liquid reservoir is assembled to the clamping device 100, the first limiting portion 211 and the second limiting portion 231 can be used to limit the liquid reservoir. In this embodiment, along the axial direction of the clamping member 2, the center line of the first limiting portion 211 is disposed opposite to the second limiting portion 231, so that the first limiting portion 211 and the second limiting portion 231 can limit the liquid reservoir. Of course, according to actual situations, at least part of the first limiting portion 211 can be disposed opposite to the second limiting portion.

[0113] In this embodiment, the middle section 22 is fixedly disposed with the bracket 1. The top section 21 has a cover body 212 and an extending portion 213. The extending portion 213 is integrally formed with the middle section 22. The extending portion 213 is bent relative to the middle section 22. The cover body 212 is fixedly disposed with the extending portion 213.

[0114] The cover body includes a bottom wall and / or a side wall, and the first limiting portion is located on the bottom wall or the side wall. In this embodiment, the cover body 212 includes a side wall 2122, and the first limiting portion 211 is located on the side wall 2122. Such a setting enables part of the liquid reservoir to be placed inside the cover body 212, which can relatively enhance the stability of the liquid reservoir during installation. Of course, according to actual situations, the cover body can be set to include a bottom wall, and the first limiting portion is located on the bottom wall. The bottom wall faces the extending portion, and the bottom wall is fixedly disposed with the extending portion, which can also limit the liquid reservoir between the cover body and the second limiting portion; or, the cover body includes a bottom wall and a side wall, the first limiting portion is located on the bottom wall or the side wall, the bottom wall faces the extending portion, the bottom wall is connected to the side wall, and the bottom wall is fixedly disposed with the extending portion, which can also realize the liquid reservoir being limited between the cover body and the second limiting portion; or, the liquid reservoir can also be limited between the extending portion and the second limiting portion.

[0115] In this embodiment, the cover body 212 has a side wall 2122, and the side wall 2122 is not parallel to the axial direction of the clamping member 2. The side wall 2122 has a first end 2122' and a second end 2122". The distance between the first end 2122' and the bottom section 23 is less than the distance between the second end 2122" and the bottom section 23. The side wall 2122 radially contracts from the first end 2122' to the second end 2122". The radial direction refers to the diameter direction of the first end 2122' and the second end 2122".

[0116] The first limiting portion 211 is located on the side wall 2122 of the cover 212 and between the first end 2122' and the second end 2122". This arrangement can relatively enhance the stability of the liquid reservoir being clamped between the cover 212 and the second limiting portion 231.

[0117] The second end 2122" is annular, and the extension 213 is welded and fixed to the second end 2122". The cover body 212 has a first opening 2123 and a second opening 2124. The first opening 2123 is located at the first end 2122', and the second opening 2124 is located at the second end 2122". The equivalent diameter of the second opening 2124 is smaller than the equivalent diameter of the first opening 2123, and the width of the extension 213 is smaller than the equivalent diameter of the second opening 2124. When the clamping part holding the tank body is immersed in an acid solution of a set temperature and a set concentration, the cover body 212 is immersed in the acid solution, so that the solution can enter the cover body 212 through the second opening 2124, so that the upper part of the liquid reservoir can react with the solution.

[0118] Of course, according to actual conditions, the side wall can be provided with one or more openings, and one or more openings can be located between the first limiting portion and the second end, so that the solution can enter the body through the openings on the side wall, react with the upper part of the liquid reservoir, and increase the coating area.

[0119] Please refer to Figure 11 As shown, in the second embodiment, the cover 212' has a bottom wall 2121', and the bottom wall 2121' is welded and fixed to the extension 213. The first limiting portion is located at the bottom wall 2121', and the bottom wall 2122 has one or more orifices, so that the solution can react with the upper part of the reservoir, increasing the coating area of the reservoir. The cover 212' has a side wall 2122, and the radial dimension of the side wall 2122 is greater than or equal to the bottom wall 2121', so that the reservoir can be partially placed in the cover 212', and the upper end of the reservoir can be limited with the cover 212'.

[0120] In this embodiment, the bottom section 23 has at least one convex portion 232, and the convex portion 232 extends along the width direction of the bottom section 23. The projection of the convex portion 232 along the axial direction of the clamping member 2 to the top section 21 is located in the region of the top section 21, and the second limiting portion 231 is located at the convex portion 232, so that the contact area between the lower part of the reservoir and the second limiting portion 231 is as small as possible, and the contact area between the reservoir and the solution is relatively increased. In the present invention, being located in the region of the cover body 212 includes the situation where the middle of the region of the cover body 212 is empty. The width direction of the bottom section 23 is the direction in which the side length of the bottom section 23 is smaller.

[0121] In this embodiment, the bottom section 23 at least includes a first convex portion 2321, a second convex portion 2322, and a concave portion 2323. The concave portion 2323 is located between the first convex portion 2321 and the second convex portion 2322. The first convex portion 2321 and the second convex portion 2322 extend along the width direction of the bottom section 23, and the concave portion 2323 extends along the width direction of the bottom section 23. The projections of the first convex portion 2321 and the second convex portion 2322 along the axial direction of the clamping member 2 onto the top section 21 are located within the area of the cover body 212, and the projection of the concave portion 2323 along the axial direction of the clamping member 2 onto the top section 21 is located within the area of the cover body 212, such that the bottom of the liquid reservoir contacts the first convex portion 2321 and the second convex portion 2322, minimizing the contact area between the liquid reservoir and the bottom section 23, maximizing the contact area between the bottom of the liquid reservoir and the solution, and relatively increasing the coating area on the surface of the liquid reservoir.

[0122] Please refer to Figures 7 - 9 As shown, in this embodiment, a part of the second limiting portion 231 is located on the first convex portion 2321, and a part of the second limiting portion 231 is located on the second convex portion 2322. Such a setting can relatively reduce the contact surface between the liquid reservoir and the bottom section 23, maximizing the contact area between the bottom of the liquid reservoir and the solution, and relatively increasing the coated surface of the liquid reservoir. Of course, according to actual situations, a part of the second limiting portion can be set between the first convex portion 2321' and the concave portion 2323, and a part of the second limiting portion can be set between the second convex portion 2322' and the concave portion 2323. The center line of the concave portion 2323 coincides with the center line of the cover body 212. At this time, the contact area between the liquid reservoir and the bottom section is even smaller, further increasing the coating area on the surface of the liquid reservoir. Of course, the bottom section can also include more than three convex portions and more than two concave portions.

[0123] Please refer to Figures 9 - 10 As shown, the thickness of the middle section 22 is w1, and the thickness of the bottom section 23 is w2, where 10 mm ≤ w1 ≤ 40 mm and 10 mm ≤ w2 ≤ 40 mm. Within this range, the stability of clamping the liquid reservoir can be enhanced. The width of the middle section 22 is t1, and the width of the bottom section 23 is t2, where 1 mm ≤ t1 ≤ 1.5 mm and 1 mm ≤ t2 ≤ 1.5 mm. Within this range, the bearing capacity requirement of the bottom section can be met, and the resilience requirement of the bottom section can also be met. The strength of the bottom section can bear the weight of the components, and at the same time, it is convenient for clamping and installing the liquid reservoir.

[0124] The material of the clamping member 2 is titanium, or the material of the clamping member 2 is steel with a titanium coating on its surface. This can meet the requirements for the corrosion resistance of the clamping member, and can also meet the requirements for the strength and resilience of the clamping member.

[0125] The bracket 1 includes a first plate member 11. The first plate member 11 includes a mounting portion 111 and a hook portion 112. The mounting portion 111 and the hook portion 112 are integrally provided. The middle section 22 is fixed to the mounting portion 111, and the hook portion 112 extends out of the clamping member 2.

[0126] The bracket 1 includes a first plate member 11, a second plate member 12, and at least two third plate members 13. One end of the third plate member 13 is fixed to the first plate member 11, and the other end of the third plate member 13 is fixed to the second plate member 12. The at least two third plate members 13 are spaced apart. The clamping members 2 are multiple, and the middle sections 22 of the respective clamping members 2 are fixed to the at least two third plate members 13.

[0127] Two adjacent third plate members 13 respectively include at least one through hole 131, and the middle section 22 includes at least two through holes 221. The clamping device 100 further includes at least two screws 3. The screws 3 pass through the through holes 131 and the through holes 221, so that the clamping member 2 is fixed to the bracket 1. Of course, according to the actual situation, the middle section 22 and the third plate member 13 can be fixed by welding, and the fixing of the clamping member 2 and the bracket 1 can also be realized. Of course, the hook portion 112 can be provided on the first plate member 11, the second plate member 12, or the third plate member 13.

Claims

1. A surface treatment method for a liquid storage container, the liquid storage container including a tank body having an inner cavity, the tank body having an inlet hole and an outlet hole, characterized in that, The surface treatment method includes the following steps: Fill the tank with gas to form a positive pressure inside the tank; seal the inlet hole and the outlet hole; Clean the tank with pure water; Immerse the tank in an acid solution at a set temperature and set concentration, and pass a current of set density for anodic oxidation treatment to form an oxide film on the surface of the tank; Clean the tank after anodic oxidation treatment and perform a sealing treatment.

2. The surface treatment method according to claim 1, characterized in that, Using a clamping device, assemble the sealed tank to the clamping device with the head facing up. The clamping device includes a bracket and at least one clamping component. Limit the head end of the tank at the top section of the clamping component, and limit the bottom end of the tank at the bottom section of the clamping component. When performing anodic oxidation, immerse the clamping component holding the tank into an acid solution at a set temperature and set concentration.

3. The surface treatment method according to claim 2, wherein Limit the head end of the tank to the cover at the top section. The first limiting part of the cover for the tank is located on the side wall of the cover. The side wall has a first end and a second end. The distance between the first end and the bottom section is less than the distance between the second end and the bottom section. The side wall radially contracts from the first end to the second end. The cover has a first opening and a second opening. The first opening is located at the first end, and the second opening is located at the second end. The equivalent diameter of the second opening is less than the equivalent diameter of the first opening. When immersing the clamping component holding the tank into an acid solution at a set temperature and set concentration, the cover is immersed in the acid solution.

4. The surface treatment method according to any one of claims 1-3, characterized in that The gas filled into the tank is nitrogen; When anodic oxidation is carried out, the set temperature is 13 to 30 °C, the acid solution is a sulfuric acid solution with a concentration of 120 to 190 g / L, and the set density of the current is 0.7 to 1.8 A / dm 2 ; In the sealing treatment, the treatment temperature is 94-101 °C and the treatment time is 1070-1100 s.

5. The surface treatment method according to any one of claims 1-3, characterized in that Before cleaning the tank with pure water, first perform a pre-cleaning treatment on the surface of the tank. The pre-cleaning treatment includes degreasing treatment. The degreasing treatment includes the steps of Immerse the tank in the degreasing agent more than once; the pH value of the degreasing agent is 8.0-11.0 and the temperature is 60±10 °C; Rinse the tank with water more than once.

6. The surface treatment method according to claim 4, characterized in that Before cleaning the tank with pure water, first perform a pre-cleaning treatment on the surface of the tank. The pre-cleaning treatment includes degreasing treatment. The degreasing treatment includes the steps of Immerse the tank in the degreasing agent more than once; the pH value of the degreasing agent is 8.0-11.0 and the temperature is 60±10 °C; Rinse the tank with water more than once.

7. The surface treatment method according to any one of claims 1-3, characterized in that Before cleaning the tank with pure water, first perform a pre-cleaning treatment on the surface of the tank. The pre-cleaning treatment includes alkaline etching treatment. The alkaline etching treatment includes the steps of Immerse the tank in an alkaline solution for a preset time in an environment of a preset temperature; The alkaline solution includes a sodium hydroxide solution with a concentration of 30 to 100 g / L or a potassium hydroxide solution with a concentration of 60 to 120 g / L and an etching additive with a concentration of 8 - 15 g / L, and the etching additive is sodium gluconate; First, rinse with water at 50 ± 20 °C for a first set time, and then rinse with water for a second set time.

8. The surface treatment method according to claim 4, wherein Before the tank body is cleaned with pure water, the surface of the tank body is first subjected to pre-cleaning treatment, and the pre-cleaning treatment includes etching treatment, and the etching treatment includes the steps of: In an environment at a preset temperature, immerse the tank body in the alkaline solution for a preset time; The alkaline solution includes a sodium hydroxide solution with a concentration of 30 to 100 g / L or a potassium hydroxide solution with a concentration of 60 to 120 g / L and an etching additive with a concentration of 8 - 15 g / L, and the etching additive is sodium gluconate; First, rinse with water at 50 ± 20 °C for a first set time, and then rinse with water for a second set time.

9. The surface treatment method according to claim 7, characterized in that After the etching treatment, brightening treatment is further included, and the brightening treatment includes the steps of: Immerse the tank body in the acidic solution for a preset time; the acidic solution is nitric acid with a concentration of 130 to 470 g / L or phosphoric acid with a concentration of 220 to 550 g / L; First, rinse the tank body with water for a first set time, and then spray the tank body with water for a second set time.

10. The surface treatment method according to claim 8, characterized in that, After the etching treatment, brightening treatment is further included, and the brightening treatment includes the steps of: Immerse the tank body in the acidic solution for a preset time; the acidic solution is nitric acid with a concentration of 130 to 470 g / L or phosphoric acid with a concentration of 220 to 550 g / L; First, rinse the tank body with water for a first set time, and then spray the tank body with water for a second set time.

11. The surface treatment method according to any one of claims 1-3, characterized in that, Cleaning the tank body after anodic oxidation treatment includes: First, rinse the tank body with water, then spray the tank body with water having a pH > 6, and finally clean the tank body with pure water having a pH > 5 more than once.

12. The surface treatment method according to claim 5, characterized in that, The sealing treatment includes: Put the cleaned tank body into water at 94 - 101 °C and keep it for a predetermined time of 1070 - 1100 s.

13. The surface treatment method according to any one of claims 6, 8, 9, and 10, characterized in that, The sealing treatment includes: Put the cleaned tank body into water at 94 - 101 °C and keep it for a predetermined time of 1070 - 1100 s.

14. The surface treatment method according to claim 7, characterized in that, The sealing treatment includes: Put the cleaned tank body into water at 94 - 101 °C and keep it for a predetermined time of 1070 - 1100 s.

15. The surface treatment method according to claim 11, characterized in that, The sealing treatment includes: Put the cleaned tank body into water at 94 - 101 °C and keep it for a predetermined time of 1070 - 1100 s.

16. The surface treatment method according to any one of claims 1-3, characterized in that, After the sealing treatment, a drying step is further included: Put the tank body after the sealing treatment into an environment at 90 - 160 °C and keep it for a certain time to dry the tank body.

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