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Preparation method of super-wetting coating on inner surface of U-shaped titanium tube

A super-wetting and inner surface technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of small size and other problems, achieve the effect of low cost, simple and convenient operation process, and low equipment price

Pending Publication Date: 2019-12-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the special shape and small size of the U-shaped tube, it is a great challenge to modify the super-wetting coating and control the uniformity of the inner surface of the U-shaped tube.

Method used

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  • Preparation method of super-wetting coating on inner surface of U-shaped titanium tube
  • Preparation method of super-wetting coating on inner surface of U-shaped titanium tube
  • Preparation method of super-wetting coating on inner surface of U-shaped titanium tube

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preparation example Construction

[0036] A preparation method for a super-wetting coating on the inner surface of a U-shaped titanium tube, characterized in that, comprising the following steps:

[0037] 1) In the embodiment, the inner diameter of the U-shaped titanium tube 1 to be processed is 3-30 mm, and the ratio of the bending diameter to the inner diameter of the tube is 0.5-30. The U-shaped titanium tube 1 is ultrasonically cleaned with detergent, tap water, isopropanol, deionized water, and alcohol in sequence, and the cleaning time is 10-30 minutes. Then dry it. When drying, blow dry with a nitrogen spray gun first, and then keep warm in an oven at 40-110°C for 0.5-10 hours.

[0038] 2) Connect the first nozzle of the three-way pipe I4 and the first nozzle of the three-way pipe II5 to the two nozzles of the U-shaped titanium pipe 1 respectively. see figure 1 , the three-way pipe I4 and the three-way pipe II5 are fixed above the U-shaped titanium pipe 1. The U-shaped titanium tube 1 is fixed by a b...

Embodiment 1

[0052]With above-mentioned specific embodiment, present embodiment provides a kind of preparation method of U-shaped titanium tube inner surface superwetting coating, it is characterized in that, comprises the following steps:

[0053] 1) In the embodiment, see figure 2 , the inner diameter of the U-shaped titanium tube 1 to be treated is 8 mm, and the ratio of the bending diameter to the inner diameter of the tube is 6.25. The U-shaped titanium tube 1 is treated with detergent, tap water, isopropanol, deionized water, and alcohol in turn. Ultrasonic cleaning, cleaning time is 30min. Then dry it. When drying, blow dry with a nitrogen spray gun, and then keep it in an oven at 40°C for 10 hours.

[0054] 2) such as figure 1 As shown, it is connected according to the method of step 2 of the specific embodiment, wherein the diameter of the flexible carbon fiber filament 2 is 1 mm. Nine small polytetrafluoroethylene insulating balls 3 with a diameter close to 8 mm are used.

...

Embodiment 2

[0067] The difference from Example 1 is:

[0068] 1. Step 1] The inner diameter of the U-shaped titanium tube is 3 mm, the ratio of the bending diameter to the inner diameter of the tube is 30, and the cleaning time is 10 minutes. The drying temperature is 110°C and the drying time is 0.5h.

[0069] 2. In step 2), the diameter of the carbon fiber is 0.1 mm, and the insulating ball is a polypropylene holed ball with a diameter of 3 mm.

[0070] 3. In step 3), the flow rate of the electrolyte is 30ml / min, and the concentration of the sodium chloride electrolyte is 1moL / L. The voltage of electrochemical etching is 150V, and the etching time is 1h.

[0071] 4. In step 6), the flow rate of the electrolyte solution is 30ml / min, and the solvent of the electrolyte solution 2 is ethylene glycol solution, which contains 0.1wt% ammonium fluoride and 1vol% deionized water. The anodizing voltage is 80V, and the oxidation time is 3h.

[0072] 5. Step 8] The soaking time of the medium an...

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Abstract

The invention relates to the field of preparation of an inner surface coating and fluid resistance reduction of a special-shaped tube, in particular to a preparation method of a super-wetting (super-hydrophilic or super-hydrophobic) coating suitable for the inner surface of a U-shaped titanium tube. When the special-shaped tube is used for transferring fluid, the fluid generates a large pressure loss in the bent portion. The super-hydrophobic coating is prepared on the inner surface of the special-shaped tube, so that resistance and energy loss are obviously reduced, and the purpose of reducing the resistance during fluid transmission is achieved. A titanium oxide nanotube array coating is uniformly prepared on the inner surface of the U-shaped titanium tube by taking the U-shaped titaniumtube as a raw material and adopting a coaxial anodic oxidation method suitable for the U-shaped tube, so that the purpose of modifying the super-wetting coating on the inner surface of the U-shaped titanium tube is achieved. The preparation method has the advantages of being simple to operate, wide in application range, high in practicability, low in cost and the like, and can be widely applied to the fields of fluid resistance reduction of the special-shaped tube and the like.

Description

technical field [0001] The invention relates to the fields of coating preparation on the inner surface of special-shaped pipes and fluid resistance reduction, in particular to a preparation method for a super-wetting (super-hydrophilic or super-hydrophobic) coating on the inner surface of a U-shaped titanium pipe. Background technique [0002] U-shaped tube is a common engineering component, which is widely used in fluid transmission, condensation heat transfer and other fields. When the fluid flows through the U-shaped tube, the drag coefficient increases due to the change of the flow velocity direction; especially when the U-shaped tube has a bending radius much larger than the pipe diameter, the drag coefficient increases significantly, which increases the energy consumption at the input end. The superhydrophobic coating prepared on the inner surface of the U-shaped tube can effectively reduce the flow resistance and has important engineering application significance. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C25D5/02C25D5/08C25D7/04
CPCC25D5/028C25D5/08C25D7/04C25D11/26
Inventor 孙立东李伟金鉴赵凯岐
Owner CHONGQING UNIV
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