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Method for preparing BaTiO3/TiO2 piezoelectric antibacterial coating on titanium surface

An antibacterial coating and piezoelectric technology, applied in the field of metal surface coating, can solve the problems of easy corrosion, accelerated corrosion of titanium metal, and endangering the ecological environment, and achieve the effects of low cost, high production efficiency, and simple preparation process

Active Publication Date: 2021-06-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the single micro-arc oxidation electrolyte in this method, it is not conducive to the growth of the film layer. The prepared micro-arc oxidation layer is extremely thin and can be used for dielectric films. If it is used as a marine anti-corrosion and anti-fouling coating, it is extremely wear-resistant Can not meet the service conditions; secondly, the film prepared by this method is easy to generate BaCO 3 phase, which is easily corroded under acidic conditions, thus destroying the integrity of the film and accelerating the corrosion of titanium metal, etc.
[0005] In view of the above research status and problems, the present invention aims to provide a method for preparing antibacterial and antifouling coatings on titanium surfaces based on piezoelectric responses, that is, using micro-arc oxidation technology to use spontaneously polarizable BaTiO 3 Micro-nano particles modify the titanium surface (under the excitation of sea waves, ultrasound or other external forces, the polarization phenomenon of the modified titanium surface will be more obvious), which endows the titanium substrate with excellent antibacterial, corrosion and wear resistance properties, and avoids Solve the problem that the traditional antibacterial micro-arc oxidation titanium coating will endanger the ecological environment and affect the health of organisms through the release of heavy metal ions for sterilization

Method used

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  • Method for preparing BaTiO3/TiO2 piezoelectric antibacterial coating on titanium surface
  • Method for preparing BaTiO3/TiO2 piezoelectric antibacterial coating on titanium surface
  • Method for preparing BaTiO3/TiO2 piezoelectric antibacterial coating on titanium surface

Examples

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Embodiment 1

[0044] This embodiment provides a kind of titanium base surface preparation BaTiO 3 / TiO 2 The method for piezoelectric antibacterial coating, the steps are as follows:

[0045] (1) The titanium matrix TA1 (its chemical composition is (wt.%), Fe: 0.03-0.05%, C: 0.08%, N: 0.03%, H: 0.014-0.018%, O: 0.015-0.018%, the rest Ti (≥99.8wt.% purity)) was cut into a square sample of 50×50×0.5mm, polished and polished successively with 180#, 360#, 800# and 1200# sandpaper, and then the polished titanium substrate was respectively Ultrasonic cleaning in acetone, ethanol, and pure water for 10 minutes each to obtain pretreated titanium samples, and dry them with cold air before use;

[0046] (2) The pretreated titanium sample that step (1) obtains is immersed in the Na containing 0.014mol / L by wire. 2 SiO 3 9H 2 O, 0.017mol / L (NaPO 3 ) 6 and 0.026mol / L BaTiO 3 Powder (particle size less than 3μm) in the electrolyte (use pure water to prepare the above chemical reagents into 3L ele...

Embodiment 2

[0054] This embodiment provides a kind of titanium base surface preparation BaTiO 3 / TiO 2 The method of piezoelectric antibacterial coating, step is basically the same as embodiment 1, and difference is only: in this experimental example, in step (3) in order to improve the surface roughness of micro-arc oxidation coating, the micro-arc oxidation voltage output of adopting For positive and negative pulses, the positive pulse voltage is 500V, the negative pulse voltage is 60V, the frequency is 600Hz, the positive pulse duty cycle is 20%, the negative pulse duty cycle is 10%, and the positive and negative pulse number ratio is 4:1.

[0055] The BaTiO prepared in this example 3 / TiO 2 The surface roughness of the coating is 1.45 μm (the surface roughness of the coating obtained in Example 1 is 2.19 μm). Compared with Example 1, the micro-arc discharge intensity is obviously weakened, the roughness is reduced, the hardness is improved, and the internal defects of the coating ar...

Embodiment 3

[0057] This embodiment provides a kind of titanium base surface preparation BaTiO 3 / TiO 2 The method of piezoelectric antibacterial coating, step is basically the same as embodiment 1, and difference is only: in the present embodiment, in the step (3) in order to obtain the micro-arc oxidation coating of appreciable thickness, adopt operating mode to be constant current mode That is, the micro-arc oxidation treatment was performed for 10 minutes under the operating parameters of a current of 0.25A, a frequency of 800 Hz, and a pulse duty ratio of 30%.

[0058] The BaTiO prepared in this example 3 / TiO 2 The thickness of the coating is 18 μm (the thickness of the coating obtained in Example 1 is 12 μm). Compared with Example 1, although the thickness of the micro-arc oxidation film layer increases and the oxidation resistance increases, but due to the constant oxidation current, the micro-arc The growth of the oxide film layer did not weaken in the later stage.

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Abstract

The invention provides a method for preparing a BaTiO3 / TiO2 piezoelectric antibacterial coating on a titanium surface. The method comprises the following steps that A, a titanium substrate is pretreated; b, the pretreated titanium substrate is immersed in an electrolyte, micro-arc oxidation treatment is carried out, and the BaTiO3 / TiO2 piezoelectric antibacterial coating is obtained; in the step B, the electrolyte is prepared from the components including 0.007-0.028 mol / L of sodium silicate nonahydrate, 0.008-0.033 mol / L of sodium hexametaphosphate and 0.002-0.035 mol / L of barium titanate powder. According to the method, the BaTiO3-doped TiO2 modified titanium coating is prepared on the surface of the titanium substrate in situ by the aid of the micro-arc oxidation technology, the BaTiO3 / TiO2 composite ceramic coating with piezoelectric response is obtained, and the BaTiO3 / TiO2 composite ceramic coating has antibacterial performance, corrosion resistance and wear resistance and can be used for surface antibacterial protective layers of underwater long-term service facilities and the like.

Description

technical field [0001] The invention relates to the technical field of metal surface coating, in particular to a method for preparing BaTiO on a titanium surface 3 / TiO 2 A method for piezoelectric antimicrobial coatings. Background technique [0002] Titanium and its alloys have been widely used as materials for the aviation industry, marine ships, and medical surgical instruments due to their low density, non-magnetic properties, high specific strength, good biocompatibility, non-toxicity, and corrosion resistance. Especially when used as a marine service facility, the chloride ion (Cl - ) have good resistance to corrosion. Although metal titanium is widely used in various fields due to its excellent comprehensive properties, there are still some problems in practical applications with the widening of its application range. First of all, titanium-based metals have poor wear resistance, which affects their safety and durability during use. Secondly, metal titanium itse...

Claims

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Application Information

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IPC IPC(8): C25D11/26C25D15/00
CPCC25D11/26C25D11/026C25D11/024C25D15/00
Inventor 刘磊王若云周潼刘洁杨剑飞胡文斌
Owner SHANGHAI JIAO TONG UNIV
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