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Micro-arc oxidation electrolyte and micro-arc oxidation method for titanium alloys

A micro-arc oxidation, titanium alloy technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems affecting the original expression and function of proteins and cells, the unsatisfactory antibacterial coating process, and the wear resistance of titanium. , poor corrosion resistance and other problems, to achieve the effect of good antibacterial function, good corrosion resistance and wear resistance, and smooth surface

Inactive Publication Date: 2014-07-09
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an implant material, titanium alloy has the following disadvantages: 1. Titanium alloy is a biologically inert material, which is surrounded by a layer of encapsulating fibrous membrane after implantation in the body, making it difficult to form a firm bond with biological tissues
2. Titanium alloys are not antibacterial, and there is a risk of postoperative infection
3. Titanium has poor wear resistance and corrosion resistance in the physiological environment and under load conditions, and it is easy to release metal ions to the body, resulting in inflammation or even implant failure.
[0005] There are the following problems in the preparation of calcium-phosphorus salt bioactive coatings by micro-arc oxidation method: First, the calcium-phosphorus salts generated on the surface of titanium alloys are all inorganic substances, which have a large gap with the inorganic substances in biological bone, and only imitate bone Hydroxyapatite synthesized from inorganic components is difficult to form new bone in a short period of time
Second, the process of preparing antibacterial coating is not ideal
This method not only has expensive raw materials and complicated process, but also silver ions can combine with nucleophilic components of biomolecules (such as proteins, enzymes, cell membranes, etc.), which will definitely affect the original expression and function of proteins and cells.
The third is to use micro-arc oxidation technology to modify the surface of titanium alloys, focusing on improving the biological activity of titanium alloys. Part of the research is to prepare antibacterial coatings, but there are not many processes for improving biological activity and antibacterial properties at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The sample is cast Ti6Al4V alloy, the size is 50×50×4mm 3 Cuboid, the specific operation steps are:

[0034] 1. Mechanical pretreatment: use sandblasting or sandpaper grinding to remove burrs, firm oxides, lubricants for extrusion, mold release agents, casting sand, cutting oil and other foreign matter, reduce surface roughness; wash with water;

[0035] 2. Degreasing: wash with a compound solution of 10g / L sodium hydroxide, 15g / L sodium phosphate, and 15g / L sodium carbonate to remove general dirt, sintered lubricants, cutting agents, etc.; the temperature is controlled at 70°C, and the time is 5 divide; wash;

[0036] 3. Pickling: washing with concentrated hydrofluoric acid and phosphoric acid in a volume ratio of 1:1, wherein the mass percentage concentration of HF in hydrofluoric acid is not less than 40%, and the concentration of H in phosphoric acid is not less than 40%. 3 PO 4 The mass percentage concentration is not less than 85%, to remove the unremoved sc...

Embodiment 2

[0044] Using Ti6Al4V alloy;

[0045] The sample is cut into 50×50×4 mm by wire 3 Cuboid, use 180~1000 ＃ Grinding with water sandpaper from coarse to fine, then cleaning in distilled water, finally scrubbing with acetone and drying in the air, then put it in a desiccator for use;

[0046] The difference from Example 1 is:

[0047] The solution used consisted of 15 g / L phytic acid;

[0048] The film adhesion method was used to evaluate the antibacterial properties of the oxidized samples, and the results showed that the antibacterial rates against Escherichia coli and Staphylococcus aureus were 6% and 95.74%, respectively.

Embodiment 3

[0050] Using Ti6Al4V alloy;

[0051] The sample is cut into 50×50×4 mm by wire 3 For the cuboid, use 180~1000# water sandpaper to grind it from coarse to fine, then wash it in distilled water, and finally scrub it with acetone and dry it in the air before placing it in a desiccator for use;

[0052] The difference from Example 1 is:

[0053] The solution used consisted of 15g / L phytic acid and 4g / L tannic acid;

[0054] The film adhesion method was used to evaluate the antibacterial properties of the oxidized samples, and the results showed that the antibacterial rates against Escherichia coli and Staphylococcus aureus were 76.09 and 65.004%, respectively.

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Abstract

The invention relates to a micro-arc oxidation electrolyte and micro-arc oxidation method for titanium alloys. The electrolyte comprises phytic acid or phytate, and one or more of electrolytes such as bioactive element containing calcium salts, magnesium salts, zinc salts or organic additives such as tannic acid and hydroxides also can be added. The micro-arc oxidation method comprises the steps of pretreatment, micro-arc oxidation, and post-processing. The micro-arc oxidation electrolyte disclosed by the invention does not contain Cr<6+>, F<-> and PO4<3->, therefore, the electrolyte has no pollution to the environment. A coating prepared according to the micro-arc oxidation method disclosed by the invention is of a typical microporous structure, and has good antimicrobial properties, biological activity, corrosion resistance and wear resistance; the method is easily-obtained in raw materials, and suitable for industrial production.

Description

technical field [0001] The invention relates to a titanium alloy surface treatment technology, in particular to a process for preparing an antibacterial organic-inorganic bioactive coating by micro-arc oxidation on the surface of a medical titanium alloy. Background technique [0002] Due to its small specific gravity, high specific strength, low elastic modulus, corrosion resistance, excellent biocompatibility and processing formability, titanium alloy has developed into an ideal functional structural material for surgical implants in recent years. However, as an implant material, titanium alloy has the following disadvantages: 1. Titanium alloy is a biologically inert material, which is surrounded by a layer of encapsulating fibrous membrane after implantation, making it difficult to form a firm bond with biological tissues. 2. Titanium alloy is not antibacterial, and there is a risk of postoperative infection. In the United States, nearly 112,000 patients are infected wi...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 张荣发廖爱娣张淑芳曲彪乔丽萍
Owner JIANGXI SCI & TECH NORMAL UNIV
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