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A kind of superhydrophobic composite coating on titanium surface and preparation method thereof

A composite coating and super-hydrophobic technology, which is applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of polluting environmental technology, limited thickness, easily damaged substrate, etc., and achieve safe and easy operation in the operation process Effect

Active Publication Date: 2021-05-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing main methods for preparing superhydrophobic coatings through metal surface modification include: self-assembly, laser, chemical conversion, anodic oxidation composite, electrodeposition, sol-gel, PVD, CVD, etc., but the above methods have their own shortcomings. : Such as low coating growth efficiency, limited thickness or polluted environment or complex process, expensive equipment or strict temperature control, easy to damage the substrate, low yield, etc.

Method used

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  • A kind of superhydrophobic composite coating on titanium surface and preparation method thereof
  • A kind of superhydrophobic composite coating on titanium surface and preparation method thereof
  • A kind of superhydrophobic composite coating on titanium surface and preparation method thereof

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preparation example Construction

[0036] combine figure 1 Shown, the invention provides a kind of preparation method of titanium surface superhydrophobic composite coating, comprising:

[0037] S1, pretreating the surface of the titanium sample;

[0038] S2, configure the basic electrolyte suitable for constructing the micro-nano array mastoid structure;

[0039] S3. Add a low surface energy organic emulsion into the basic electrolyte, and disperse evenly to form a micro-arc induction / thermal pressure field assisted plasma oxidation electrolyte;

[0040] S4. Place the pretreated titanium sample in the micro-arc induction / thermal pressure field assisted plasma oxidation electrolyte, use the stainless steel plate or stainless steel pool as the cathode, and the pretreated titanium sample as the anode, conduct micro Arc-induced / hot pressure field-assisted plasma oxidation forms a superhydrophobic composite coating on the surface of the pretreated titanium sample.

[0041] Therefore, by optimizing the basic elec...

Embodiment 1

[0070] This embodiment provides a method for preparing a superhydrophobic composite coating on a titanium surface, and the specific steps are as follows:

[0071] 1. Choose TA15 titanium alloy as the substrate, polish the surface with 800#, 1000# and 1500# sandpaper in turn, and then ultrasonically clean it with acetone and deionized water for 20 minutes respectively;

[0072] 2. Mix with sodium silicate hydrate 20g / L, sodium metaphosphate 6g / L, and sodium hydroxide 2g / L, that is, the concentration ratio of sodium silicate, sodium metaphosphate and sodium hydroxide is 10:3:1 , mechanically stirred evenly, the electrolyte system is optimized to prepare the basic electrolyte with micro-nano array papillae structure;

[0073] 3. Add 20% volume fraction of polytetrafluoroethylene (PTFE) emulsion into the uniform basic electrolyte, and disperse it ultrasonically for 40 minutes to prepare a micro-arc induction / thermal pressure field assisted plasma oxidation electrolyte with good un...

Embodiment 2

[0077] The difference between this embodiment and the above-mentioned embodiment 1 is that a method for preparing a superhydrophobic composite coating on a titanium surface is provided, and the specific steps are as follows:

[0078] 1. Choose TA15 titanium alloy as the substrate, polish the surface with 800#, 1000# and 1500# sandpaper in sequence, and then ultrasonically clean it with acetone and deionized water for 30 minutes respectively;

[0079] 2. Mix in the ratio of hydrated sodium silicate 18g / L, sodium metaphosphate 6g / L, and sodium hydroxide 3g / L, that is, the concentration ratio of sodium silicate, sodium metaphosphate and sodium hydroxide is 6:2:1 , mechanically stirred evenly to obtain a basic electrolyte;

[0080] 3. Add 20% volume fraction of polytetrafluoroethylene (PTFE) emulsion into the uniform basic electrolyte, and disperse it ultrasonically for 60 minutes to prepare a micro-arc induction / hot pressure field assisted plasma oxidation electrolyte with good u...

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Abstract

The invention provides a super-hydrophobic composite coating on a titanium surface and a preparation method thereof. The preparation method comprises: pretreating the surface of a titanium sample; configuring a basic electrolyte suitable for constructing a micro-nano array papillae structure; Add low surface energy organic emulsion into the basic electrolyte, disperse uniformly to form a micro-arc induction / thermal pressure field assisted plasma oxidation electrolyte; put the pretreated titanium sample in the micro-arc induction / thermal pressure field assisted plasma In the bulk oxidation electrolyte, a stainless steel plate or a stainless steel pool is used as a cathode, and the pretreated titanium sample is used as an anode, and micro-arc induction / thermal pressure field assisted plasma oxidation is performed, and the pretreated titanium sample is A superhydrophobic composite coating on the titanium surface is formed on the surface. The invention constructs a superhydrophobic "lotus leaf" morphology on the titanium surface through a one-step method, and the operation process is safe, efficient, easy to operate, and does not contain any toxic organic solvents or by-products, and is suitable for popularization.

Description

technical field [0001] The invention relates to the field of titanium surface modification, in particular to a superhydrophobic composite coating on a titanium surface and a preparation method thereof. Background technique [0002] Titanium and titanium alloys have excellent properties such as high specific strength, good heat resistance, and good corrosion resistance; while superhydrophobic surfaces have the characteristics of self-cleaning, drag and friction reduction, anti-frosting, and surface corrosion inhibition. Therefore, improving the hydrophobicity of the surface of titanium or titanium alloys is of great significance to the development of industries such as aerospace, ships, and weapons. [0003] The existing main methods for preparing superhydrophobic coatings through metal surface modification include: self-assembly, laser, chemical conversion, anodic oxidation composite, electrodeposition, sol-gel, PVD, CVD, etc., but the above methods have their own shortcomin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26
CPCC25D11/024C25D11/026C25D11/26
Inventor 王亚明王树棋邹永纯贾德昌周玉
Owner HARBIN INST OF TECH
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