Surface treatment process suitable for water tank blank with flow guide structure and water tank thereof

Abstract

The invention discloses a surface treatment process suitable for a water tank blank with a flow guide structure. The surface treatment process at least comprises the following steps that (1) the water tank blank with the flow guide structure is pretreated; (2) sanding; 3) first acid pickling; 4) electrolysis; (5) secondary acid pickling; (6) passivating; (7) coating a nanoscale hydrophobic and oleophobic coating; the surface treatment technology is researched and developed for the water tank blank with the flow guide structure, all steps and parameters of the surface treatment technology are specifically designed, and the surface of the water tank blank with the flow guide structure can be effectively compounded with nanoscale hydrophobic and oleophobic paint under the condition that the function of the flow guide structure is not affected; and the comprehensive performance of the water tank product is further improved. The invention further discloses the water tank based on the surface treatment process.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen hardware, and in particular to a surface treatment process suitable for a sink blank with a diversion structure and a sink thereof. Background Art

[0002] The sink is an important hardware product for daily household use. Among all kinds of kitchen appliances, the sink has the highest utilization rate. It can be used to wash hands, food, and dishes, and can also be used to soak vegetables and meat, etc. In order to improve the scratch resistance of the sink, an embossed sink has appeared on the market. This type of sink is provided with a number of regularly arranged vertical raised textures (cylindrical or elliptical cylinders) on the bottom surface of the sink. The manufacturing process of the embossed sink includes plate processing and metal parts processing, wherein the plate processing includes plate embossing, leveling, grinding and polishing, laminating, cutting and laser cutting, etc., and the metal parts processing includes plate bending, incision welding, and panel frame socketing to produce a formed sink, and then the formed sink is polished and wired to produce a finished product. However, the embossed sink manufactured by the above method has a vertical protrusion of the texture relative to the bottom of the sink, which leads to the problem of residual water at the connection position between the texture and the bottom of the sink. Therefore, the embossed sink has the problem of poor drainage.

[0003] The applicant has been deeply engaged in the field of kitchen and bathroom hardware processing and manufacturing technology for many years. In order to solve the above-mentioned problems, the applicant has developed a water sink pattern that can divert water and applied for a patent, namely, a water sink with a diversion structure with application number 202311024374.2, comprising a trough body and an extension arranged on the outer edge of the upper end of the trough body, and a diversion layer is provided on at least the bottom surface of the inner cavity of the trough body, and the diversion layer is formed by a number of diversion structures arranged at intervals. The diversion structure is at least one of a nipple point, a nipple pattern, a nipple line, a spherical crown, an ellipsoidal crown, a hemisphere, and a semi-ellipsoid. A diversion area is formed between adjacent diversion structures, and the cross-section of the diversion structure is a curved surface, and the slope of the bottom of the curved surface is 20 to 70 degrees.

[0004] The above-mentioned technology of the applicant utilizes a guide structure with a curved cross-section to form a valley peak that can be filled with air between the bottom surface of the sink, thereby forming an air cushion that supports the water / oil, reduces the contact area between the water / oil and the bottom surface of the sink, and facilitates the flow of water / oil, thereby replacing the cylindrical or elliptical raised texture of the existing embossed sink.

[0005] During the product iteration process, the inventor studied the product and found that if a layer of nano-scale hydrophobic and oleophobic coating could be added on the surface of the diversion structure, the overall performance of the product could be further improved. However, due to the special and delicate diversion structure of the product, the composite effect of the diversion structure without any treatment and the hydrophobic and oleophobic coating is not good, and the surface treatment process of the diversion structure also needs to be improved in a targeted manner. Summary of the invention

[0006] In view of the problems in the related technology, the present invention proposes a surface treatment process suitable for a sink blank with a guide structure to overcome the above-mentioned technical problems existing in the existing related technology. The present invention also discloses a sink based on the surface treatment process.

[0007] The technical solution of the present invention is achieved in this way:

[0008] The surface treatment process for a water tank blank with a diversion structure includes at least the following steps:

[0009] 1) Pre-treating the water tank blank with the diversion structure;

[0010] 2) Sand blasting;

[0011] 3) First pickling;

[0012] 4) Electrolysis;

[0013] 5) Second pickling;

[0014] 6) Passivation;

[0015] 7) Apply nano-scale hydrophobic and oleophobic coating.

[0016] When the water tank blank with a guide structure is transferred to the surface treatment process designed by the present invention, some oil, dust or other impurities will mostly remain, so it needs to be pre-treated.

[0017] Preferably, in step 1), the pretreatment comprises the following steps:

[0018] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 2 to 8 minutes, wherein the degreasing liquid is prepared by degreasing powder and water at a ratio of 1:3 to 5;

[0019] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0020] Specifically, the degreasing powder adopts the WD-516 chemical degreasing powder produced by Bandai Chemical Raw Materials (Dongguan) Co., Ltd.

[0021] Preferably, in step 2), the diameter of the sand particles used in sand blasting is 0.4-0.8 mm, the sand blasting force is between 0.5-1 MPa, and the sand blasting distance is 10-50 cm.

[0022] The sandblasting operation is based on the premise of retaining the original color of the sink blank. The sand grains can be glass sand, iron sand, stainless steel sand, etc. Technicians in this field can adaptively use sand grains of different materials according to actual requirements.

[0023] Preferably, in step 3), the first pickling operation is: placing the sandblasted water tank blank into a first pickling solution for pickling for 10 to 300 seconds, wherein the first pickling solution is a sulfuric acid solution with a concentration of 8 to 10 mol / L.

[0024] Preferably, in step 4), the specific parameters of electrolysis are:

[0025] The electrolyte is a mixture of sulfuric acid, phosphoric acid and water in a volume ratio of 0.4-0.8:1.5-2:1;

[0026] Current 4~8A;

[0027] Voltage 10~20V;

[0028] The temperature is controlled at 60-80℃;

[0029] The electrolysis time is 20 to 150 seconds.

[0030] Preferably, in step 5), the second pickling operation is: placing the electrolyzed water tank blank into a second pickling solution for pickling for 10 to 300 seconds, wherein the second pickling solution is a sulfuric acid solution with a concentration of 20 to 25 mol / L.

[0031] More preferably, a cleaning and drying step is provided between step 5) and step 6), and the specific operation is: use ultrasonic equipment to add pure water to clean the water tank blank for 3 to 10 minutes, and then place it in a drying equipment at 100 to 200°C for 6 to 35 minutes.

[0032] Preferably, in step 6), the passivation operation is: the water tank blank is completely immersed in a passivation solution, wherein the passivation solution contains a passivator and water in a mass ratio of 1:2 to 4, and the passivation time is 3 to 10 minutes.

[0033] Specifically, the passivating agent is the passivating agent produced by Ronggui Jianquan Detergent Factory in Shunde District, Foshan City.

[0034] Preferably, the coating amount of the nano-scale hydrophobic and oleophobic coating is 15 to 35 g / m 2 .

[0035] More preferably, the nano-scale hydrophobic and oleophobic coating is nano-oil produced by Dongguan Dingcheng Nano Surface Treatment Technology Co., Ltd.

[0036] The present invention develops surface treatment technology for the special guide structure of the prior application, and specifically designs each step and parameter of the surface treatment process. While ensuring that the function of the guide structure is not affected, the surface of the sink blank with the guide structure can be effectively compounded with nano-level hydrophobic and oleophobic coating to further improve the comprehensive performance of the sink product.

[0037] Specifically, the flow guiding structure at least includes a mastoid point, a mastoid pattern and a mastoid line, and the flow guiding structure is used for guiding water and oil;

[0038] The surface of the guide structure has a plurality of pit-like structures, the depth of the guide structure is 10 to 80 μm, a concave guide area is formed between adjacent guide structures, and the distance between adjacent guide structures is 10 μm to 2 mm; the cross-section of the guide structure is a curved surface, and the slope of the bottom of the curved surface is 20 to 70 degrees.

[0039] The distance design between adjacent guide structures can avoid the situation where the liquid is filled into the space between adjacent guide structures and valleys that cannot be filled with air are not formed due to the distance between adjacent guide structures being too large. At the same time, the present invention controls the process parameters of sandblasting, electrolysis, and pickling accurately, so that the surface of the guide structure forms a pit-like structure that is conducive to the adhesion of the coating but does not affect the overall structure of the guide structure. The depth design of the guide structure can reduce the processing difficulty of the guide structure. Excessive depth will affect the texture and aesthetics of the guide structure, and too deep will hide dirt, while too shallow will result in poor guide effect.

[0040] The present invention further discloses a water tank, the inner surface of which is provided with a guide layer, the surface of which is treated by the above-mentioned surface treatment process, and the surface of which is coated with a nano-scale hydrophobic and oleophobic coating to form a nano-coating.

[0041] Specifically, the guide layer is formed by a plurality of guide structures arranged at intervals, and the guide structures at least include mastoid points, mastoid patterns and mastoid lines, and the guide structures are used for guiding water and oil.

[0042] The surface of the guide structure has a plurality of pit-like structures, the depth of the guide structure is 10 to 80 μm, a guide area is formed between adjacent guide structures, and the distance between adjacent guide structures is 10 μm to 2 mm; the cross-section of the guide structure is a curved surface, and the slope of the bottom of the curved surface is 20 to 70 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a cross-sectional view of the layer structure of the water tank blank after the surface treatment of the present invention;

[0044] Figure 2 This is a picture of a water tank product after the surface treatment of the present invention;

[0045] Figure 3 Schematic diagram of the pattern shape of the diversion structure.

[0046] Reference numerals

[0047] 1. Flow diversion structure; 2. Flow diversion area; 3. Nano coating. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] With reference to the applicant's prior application, namely, a water sink with a flow-guiding structure and a method for manufacturing the water sink with application number CN202311024374.2, a water sink blank with a flow-guiding structure is produced.

[0051] 1) The guide structure is formed by a rolling machine in conjunction with a mold. The raw material blanks used to make the sink are physically extruded or rolled to press out the texture. The equipment pressure is 200T and the plate conveying speed is 40m / min.

[0052] 2) The blank is sent to a polishing machine for downward pressure polishing. The conveying speed of the blank is 30m / min, the polishing depth is 20μm, the resulting texture has a bright effect of 15K, and the hardness is 150 Rockwell hardness, thereby obtaining a sink blank with a diversion structure.

[0053] Reference Figures 1 to 3 The inner surface of the water tank blank forms a guide layer, which is formed by a plurality of guide structures 1 arranged at intervals. The guide structure 1 is used to guide water and oil. The guide structure 1 includes nipple points, nipple patterns and nipple lines. For specific pattern shapes and structures, please refer to Figure 3 , showing the mastoid point ( Figure 3 1.1), papillary pattern ( Figure 31.2) and papillary lines ( Figure 3 1.3) shape.

[0054] The depth of the guide structure 1 is 45 μm, a guide area 2 is formed between adjacent guide structures 1, and the distance between adjacent guide structures 1 is 1 mm.

[0055] The cross section of the flow-guiding structure 1 is a curved surface, the slope of the bottom of the curved surface is 45 degrees, and the outer edge of the flow-guiding structure 1 is a curve.

[0056] The following are sources of some raw materials in the examples and comparative examples. The rest are conventional commercially available raw materials unless otherwise specified.

[0057] The degreasing powder used is WD-516 chemical degreasing powder produced by Bandai Chemical Raw Materials (Dongguan) Co., Ltd.

[0058] The passivating agent used was produced by Ronggui Jianquan Detergent Factory in Shunde District, Foshan City.

[0059] The nano-scale hydrophobic and oleophobic coating uses nano-oil (high hardness, acid and alkali resistance, special for sinks) produced by Dongguan Dingcheng Nano Surface Treatment Technology Co., Ltd.

[0060] Example 1

[0061] The surface treatment process for a water tank blank having a flow guide structure 1 comprises the following steps:

[0062] 1) Pre-treatment of the sink blank with diversion structure:

[0063] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 2 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 75 kg of water;

[0064] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0065] 2) Sand blasting: Use stainless steel sand with a diameter of 0.4mm, the sand blasting force value is between 0.5MPa, and the sand blasting distance is 10cm.

[0066] The moving speed of the gun head of the sandblasting equipment is 5 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0067] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 50 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 8 mol / L.

[0068] 4) Electrolysis:

[0069] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.4:1.5:1;

[0070] Current 4A;

[0071] Voltage 10V;

[0072] The temperature is controlled at 60℃;

[0073] The electrolysis time is 50s.

[0074] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 50 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 20 mol / L.

[0075] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 3 minutes to remove residual passivation liquid and impurities.

[0076] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 100°C and the drying time is 35 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0077] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 2 kg of water. The passivation time is 3 minutes.

[0078] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0079] Example 2

[0080] 1) Pre-treatment of the water tank blank with diversion structure:

[0081] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 4 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 90 kg of water;

[0082] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0083] 2) Sand blasting: Use stainless steel sand with a diameter of 0.5mm, the sand blasting force value is between 0.6MPa, and the sand blasting distance is 20cm.

[0084] The moving speed of the gun head of the sandblasting equipment is 6 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0085] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 100 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 8.5 mol / L.

[0086] 4) Electrolysis:

[0087] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.5:1.5:1;

[0088] Current 5A;

[0089] Voltage 12V;

[0090] The temperature is controlled at 65℃;

[0091] The electrolysis time is 75s.

[0092] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 100 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 21 mol / L.

[0093] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 5 minutes to remove residual passivation liquid and impurities.

[0094] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 125°C and the drying time is 25 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0095] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 2.5 kg of water. The passivation time is 5 minutes.

[0096] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0097] Example 3

[0098] 1) Pre-treatment of the sink blank with diversion structure:

[0099] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 5 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 100 kg of water;

[0100] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0101] 2) Sand blasting: Use stainless steel sand with a diameter of 0.6mm, the sand blasting force value is between 0.7MPa, and the sand blasting distance is 30cm.

[0102] The moving speed of the gun head of the sandblasting equipment is 6 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0103] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 150 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 9 mol / L.

[0104] 4) Electrolysis:

[0105] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.6:1.8:1;

[0106] Current 6A;

[0107] Voltage 15V;

[0108] The temperature is controlled at 70℃;

[0109] The electrolysis time was 100 s.

[0110] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 150 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 22 mol / L.

[0111] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 6 minutes to remove residual passivation liquid and impurities.

[0112] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 150°C and the drying time is 20 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0113] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 3 kg of water. The passivation time is 7 minutes.

[0114] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0115] Example 4

[0116] 1) Pre-treatment of the water tank blank with diversion structure:

[0117] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 6 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 110 kg of water;

[0118] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0119] 2) Sand blasting: Use stainless steel sand with a diameter of 0.7mm, the sand blasting force value is between 0.9MPa, and the sand blasting distance is 40cm.

[0120] The moving speed of the gun head of the sandblasting equipment is 7 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0121] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 200 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 9.5 mol / L.

[0122] 4) Electrolysis:

[0123] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.7:1.8:1;

[0124] Current 7A;

[0125] Voltage 18V;

[0126] The temperature is controlled at 75℃;

[0127] The electrolysis time is 125s.

[0128] 5) Second pickling: the electrolyzed water tank blank is placed in a second pickling solution for pickling for 200 seconds, wherein the second pickling solution is a sulfuric acid solution with a concentration of 24 mol / L.

[0129] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 7 minutes to remove residual passivation liquid and impurities.

[0130] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 175°C and the drying time is 15 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0131] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 3.5 kg of water. The passivation time is 8 minutes.

[0132] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0133] Example 5

[0134] 1) Pre-treatment of the water tank blank with diversion structure:

[0135] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 8 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 125 kg of water;

[0136] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0137] 2) Sand blasting: Use stainless steel sand with a diameter of 0.8mm, the sand blasting force value is between 1MPa, and the sand blasting distance is 50cm.

[0138] The moving speed of the gun head of the sandblasting equipment is 8 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0139] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 250 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 10 mol / L.

[0140] 4) Electrolysis:

[0141] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.8:2:1;

[0142] Current 8A;

[0143] Voltage 20V;

[0144] The temperature is controlled at 80℃;

[0145] The electrolysis time is 150s.

[0146] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 250 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 25 mol / L.

[0147] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 10 minutes to remove residual passivation liquid and impurities.

[0148] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 200°C and the drying time is 6 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0149] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 4 kg of water. The passivation time is 10 minutes.

[0150] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0151] Comparative Example 1

[0152] Compared with Example 3, this comparative example is a water tank blank with a guide structure without any surface treatment.

[0153] Comparative Example 2

[0154] 1) Pre-treatment of the sink blank with diversion structure:

[0155] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 5 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 100 kg of water;

[0156] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0157] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 150 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 9 mol / L.

[0158] 4) Electrolysis:

[0159] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.6:1.8:1;

[0160] Current 6A;

[0161] Voltage 15V;

[0162] The temperature is controlled at 70℃;

[0163] The electrolysis time was 100 s.

[0164] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 150 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 22 mol / L.

[0165] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 6 minutes to remove residual passivation liquid and impurities.

[0166] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 150°C and the drying time is 20 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0167] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 3 kg of water. The passivation time is 7 minutes.

[0168] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0169] Comparative Example 3

[0170] 1) Pre-treatment of the water tank blank with diversion structure:

[0171] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 5 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 100 kg of water;

[0172] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0173] 2) Sand blasting: Use stainless steel sand with a diameter of 0.6mm, the sand blasting force value is between 0.7MPa, and the sand blasting distance is 30cm.

[0174] The moving speed of the gun head of the sandblasting equipment is 6 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0175] 4) Electrolysis:

[0176] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.6:1.8:1;

[0177] Current 6A;

[0178] Voltage 15V;

[0179] The temperature is controlled at 70℃;

[0180] The electrolysis time was 100 s.

[0181] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 150 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 22 mol / L.

[0182] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 6 minutes to remove residual passivation liquid and impurities.

[0183] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 150°C and the drying time is 20 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0184] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 3 kg of water. The passivation time is 7 minutes.

[0185] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0186] Comparative Example 4

[0187] The surface treatment process for a water tank blank having a flow guide structure 1 comprises the following steps:

[0188] 1) Pre-treatment of the water tank blank with diversion structure:

[0189] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 2 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 75 kg of water;

[0190] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0191] 2) Sand blasting: Use stainless steel sand with a diameter of 0.4mm, the sand blasting force value is between 0.5MPa, and the sand blasting distance is 10cm.

[0192] The moving speed of the gun head of the sandblasting equipment is 5 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0193] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 50 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 8 mol / L.

[0194] 4) Electrolysis:

[0195] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.4:1.5:1;

[0196] Current 3A;

[0197] Voltage 10V;

[0198] The temperature is controlled at 55°C;

[0199] The electrolysis time is 40s.

[0200] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 50 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 20 mol / L.

[0201] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 3 minutes to remove residual passivation liquid and impurities.

[0202] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 100°C and the drying time is 35 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0203] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 2 kg of water. The passivation time is 3 minutes.

[0204] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0205] Comparative Example 5

[0206] 1) Pre-treatment of the sink blank with diversion structure:

[0207] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 8 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 125 kg of water;

[0208] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0209] 2) Sand blasting: Use stainless steel sand with a diameter of 0.8mm, the sand blasting force value is between 1MPa, and the sand blasting distance is 50cm.

[0210] The moving speed of the gun head of the sandblasting equipment is 8 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0211] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 250 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 10 mol / L.

[0212] 4) Electrolysis:

[0213] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.8:2:1;

[0214] Current 10A;

[0215] Voltage 20V;

[0216] The temperature is controlled at 85℃;

[0217] The electrolysis time is 180s.

[0218] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 250 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 25 mol / L.

[0219] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 10 minutes to remove residual passivation liquid and impurities.

[0220] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 200°C and the drying time is 6 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0221] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 4 kg of water. The passivation time is 10 minutes.

[0222] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0223] Comparative Example 6

[0224] 1) Pre-treatment of the sink blank with diversion structure:

[0225] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 8 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 125 kg of water;

[0226] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0227] 2) Sand blasting: Use stainless steel sand with a diameter of 0.8mm, the sand blasting force value is between 1MPa, and the sand blasting distance is 50cm.

[0228] The moving speed of the gun head of the sandblasting equipment is 8 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0229] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 250 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 10 mol / L.

[0230] 4) Electrolysis:

[0231] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 1:2.5:1;

[0232] Current 8A;

[0233] Voltage 20V;

[0234] The temperature is controlled at 80℃;

[0235] The electrolysis time is 150s.

[0236] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 250 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 25 mol / L.

[0237] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 10 minutes to remove residual passivation liquid and impurities.

[0238] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 200°C and the drying time is 6 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0239] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 4 kg of water. The passivation time is 10 minutes.

[0240] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0241] Comparative Example 7

[0242] 1) Pre-treatment of the water tank blank with diversion structure:

[0243] 1-1) Using a degreasing device to continuously spray a degreasing liquid on the water tank blank for 8 minutes, the degreasing liquid is prepared from 25 kg of degreasing powder and 125 kg of water;

[0244] 1-2) Inspect the sink blank. If there are any scratches, abrasions, cracks, annealing marks, etc., repair them as much as possible and then proceed to the next step. If they cannot be repaired, treat them as defective products. If there are no scratches, abrasions, cracks, annealing marks, proceed directly to the next step.

[0245] 2) Sand blasting: Use stainless steel sand with a diameter of 0.8mm, the sand blasting force value is between 1MPa, and the sand blasting distance is 50cm.

[0246] The moving speed of the gun head of the sandblasting equipment is 8 mm / s. The gun head moves to completely cover the surface of the guide layer of the water tank blank. One time of sandblasting is one sandblasting cycle. Two sandblasting cycles are set.

[0247] 3) First pickling: The sandblasted water tank blank is placed in a first pickling solution for pickling for 250 seconds. The first pickling solution is a sulfuric acid solution with a concentration of 10 mol / L.

[0248] 4) Electrolysis:

[0249] The electrolyte is a mixture of sulfuric acid (purity 98%), phosphoric acid (purity 85%) and water in a volume ratio of 0.8:2:1;

[0250] Current 8A;

[0251] Voltage 20V;

[0252] The temperature is controlled at 80℃;

[0253] The electrolysis time is 150s.

[0254] 5) Second pickling: The electrolyzed water tank blank is placed in a second pickling solution for pickling for 300 seconds. The second pickling solution is a sulfuric acid solution with a concentration of 25 mol / L.

[0255] Cleaning: Use ultrasonic equipment to add pure water to clean the sink blank for 10 minutes to remove residual passivation liquid and impurities.

[0256] Drying: The cleaned sink blanks enter the drying box through the flow line. The drying temperature is 200°C and the drying time is 6 minutes. The surface of the guide structure of the obtained sink blank has multiple pit-like structures.

[0257] 6) Passivation: The water tank blank enters the passivation tank through the flow line and is completely immersed in the passivation solution, which contains 1 kg of passivator and 4 kg of water. The passivation time is 10 minutes.

[0258] 7) Collection and turnover: After completing the above process, when the sink blanks are stacked, clean paper must be placed between two sink blanks as protection to prevent the sink blanks from causing secondary damage during the turnover and transportation process.

[0259] Examples 1 to 5 and Comparative Examples 1 to 7 were cleaned and dried, referring to Figure 1 The surface of the guide layer of Examples 1 to 5 and Comparative Examples 1 to 7 is coated with a nano-scale hydrophobic and oleophobic coating, with a coating amount of 25 g / m 2 After drying and curing, nano coatings 3 are formed, which are numbered EG1 to EG5 and CG1 to CG7 respectively.

[0260] Performance Testing

[0261] (1) Visual observation of the surface morphology of Examples 1 to 5 and Comparative Examples 1 to 7

[0262]

[0263] It can be seen from the adhesion data in the table that the surface morphology of Examples 1 to 5 is better than that of Comparative Examples 1 to 7, indicating that the surface treatment process of the present invention can effectively improve the surface morphology of the sink with a diversion structure, and can effectively improve the aesthetics of the final sink product. It is also beneficial for the subsequent compounding with nano-scale hydrophobic and oleophobic coatings, indicating that the design of each process step and parameter of the present invention is specifically designed for the diversion structure on the surface of the sink, which is the key technical feature of the present application.

[0264] (2) Adhesion test

[0265] Adhesion test was conducted on EG1~EG5 and CG1~CG7 by XH-M adhesion tester (using 20mm spindle), the results are as follows:

[0266] － Adhesion / MPa － Adhesion / MPa EG1 14.64 CG1 7.21 EG2 15.21 CG2 9.57 EG3 16.30 CG3 9.13 EG4 15.72 CG4 8.31 EG5 15.01 CG5 11.08 － － CG6 10.98 － － CG7 11.45

[0267] It can be seen from the adhesion data in the table that the adhesion of Examples 1 to 5 to the nano-hydrophobic and oleophobic coating is better than that of Comparative Examples 1 to 7, indicating that the surface treatment process of the present invention can effectively improve the surface adhesion of the sink with a guide structure, thereby improving the firmness of the combination of the nano-hydrophobic and oleophobic coating and the surface of the guide layer; it also illustrates that the design of the various process steps and parameters of the present invention is specifically designed for the guide structure on the surface of the sink, which is the key technical feature of the present application.

[0268] (3) Surface performance test

[0269] The water contact angle and oil contact angle of EG1-5 and comparative example 1 in air were tested using a contact angle tester.

[0270] Neutral salt spray test was conducted on EG1-5 and comparative example 1. The specific operation was as follows: a salt solution containing (mass concentration 5±0.5%) sodium chloride and pH value 6.5-7.2 was sprayed in the test chamber through a spray device. The temperature of the test chamber was required to be (35±2)°C, the humidity was >95%, and the fogging amount was 1-2mL / (h·cm 2 ), nozzle pressure is 78.5~137.3kPa(0.8~1.4kgf / cm 2 ).

[0271] The salt mist was allowed to settle on the surfaces of the guide layers of EG1 to 5 and comparative example 1, and the surface corrosion state was observed after a certain period of time.

[0272] If there is no obvious corrosion on the surface after 150 hours, it is qualified.

[0273] － Water contact angle Oil contact angle Neutral salt spray test duration EG1 96° 60° 400h EG2 103° 63° 450h EG3 106° 66° 500h EG4 104° 64° 450h EG5 97° 61° 400h Comparative Example 1 81° 52° 130h

[0274] It can be seen from the above test data that, compared with the comparative example 1 without surface treatment, the hydrophobic and oleophobic properties and corrosion resistance of Examples 1 to 5 after the surface treatment process of the present application can be effectively improved.

[0275] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also change and modify the above implementation modes. Therefore, the present invention is not limited to the specific implementation modes disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A surface treatment process for a water tank blank with a diversion structure, characterized in that: At least the following steps are included: 1) Pre-treating the water tank blank with the diversion structure; 2) Sand blasting; 3) First pickling; 4) Electrolysis; 5) Second pickling: 6) Passivation; 7) Apply nano-scale hydrophobic and oleophobic coating.

2. The surface treatment process according to claim 1, characterized in that: In step 2), the diameter of the sand particles used in the sand blasting is 0.4-0.8 mm, the sand blasting force value is between 0.5-1 MPa, and the sand blasting distance is 10-50 cm.

3. The surface treatment process according to claim 1 or 2, characterized in that: In step 4), the specific parameters of electrolysis are: the electrolyte is a mixture of sulfuric acid, phosphoric acid and water in a volume ratio of 0.4-0.8:1.5-2:1, the current is 4-8A, the voltage is 10-20V, the temperature is controlled at 60-80°C, and the electrolysis time is 20-150s.

4. The surface treatment process according to claim 3, characterized in that: In step 3), the first pickling operation is: placing the sandblasted water tank blank into a first pickling solution for pickling for 10 to 300 seconds, wherein the first pickling solution is a sulfuric acid solution with a concentration of 8 to 10 mol / L.

5. The surface treatment process according to claim 3, characterized in that: In step 5), the second pickling operation is: putting the electrolyzed water tank blank into a second pickling solution for pickling for 10 to 300 seconds, wherein the second pickling solution is a sulfuric acid solution with a concentration of 20 to 25 mol / L.

6. The surface treatment process according to claim 5, characterized in that: In step 6), the passivation operation is as follows: the water tank blank is completely immersed in a passivation solution, wherein the passivation solution contains a passivation agent and water in a mass ratio of 1:2 to 4, and the passivation time is 3 to 10 minutes; A cleaning and drying step is provided between step 5) and step 6), and the specific operation is: use ultrasonic equipment to add pure water to clean the water tank blank for 3 to 10 minutes, and then place it in a drying equipment at 100 to 200° C. for 6 to 35 minutes.

7. The surface treatment process according to claim 1 or 2, characterized in that: The coating amount of the nano-scale hydrophobic and oleophobic coating is 15 to 35 g / m 2 .

8. The surface treatment process according to claim 6, characterized in that: The nano-scale hydrophobic and oleophobic coating is nano-oil produced by Dongguan Dingcheng Nano Surface Treatment Technology Co., Ltd.; The passivating agent is produced by Ronggui Jianquan Detergent Factory in Shunde District, Foshan City.

9. The surface treatment process according to claim 1 or 2, characterized in that: The diversion structure at least includes a mastoid point, a mastoid pattern and a mastoid line; The surface of the guide structure has a plurality of pit-shaped structures, the depth of the guide structure is 10 to 80 μm, a concave guide area is formed between adjacent guide structures, and the distance between adjacent guide structures is 10 μm to 2 mm; The cross section of the diversion structure is a curved surface, and the slope of the bottom of the curved surface is 20 to 70 degrees.

10. A water tank, characterized in that: The inner surface of the water tank has a guide layer, the surface of the guide layer is treated by the surface treatment process according to any one of claims 1 to 9, and the surface of the guide layer is coated with a nano-scale hydrophobic and oleophobic coating to form a nano-coating; The guide layer is formed by a plurality of guide structures arranged at intervals, and the guide structures at least include mastoid points, mastoid patterns and mastoid lines; The surface of the guide structure has a plurality of pit-shaped structures, the depth of the guide structure is 10 to 80 μm, a guide area is formed between adjacent guide structures, and the distance between adjacent guide structures is 10 μm to 2 mm; The cross section of the diversion structure is a curved surface, and the slope of the bottom of the curved surface is 20 to 70 degrees.

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