A method for preparing titanium alloy biomimetic coating by combining laser and anodic oxidation
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An anodizing and titanium alloy technology, applied in the field of bionic structure layer, can solve the problems of uncontrollable surface pore structure and process pollution, and achieve the effects of easy adjustment, accelerated element diffusion, and improved biological activity.
Active Publication Date: 2019-02-01
ZHEJIANG UNIV OF TECH
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[0003] As a surface modification technology, anodic oxidation can form a titanium dioxide gel layer with a micro-nano multi-level pore structure, but there are problems such as serious process pollution and uncontrollable surface pore structure.
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Embodiment 1
[0030] (1) Preparation of samples and reagents
[0031] Take a 20×20×5mm TC4 titanium alloy and use a 500w IPG fiber laser. Under the conditions of laser power of 500W, spot diameter of 0.1mm, scanning distance of 0.06mm, and scanning speed of 1000mm / s, the alloy surface was scanned to obtain TC4 titanium alloy sample 1 after laser pretreatment.
[0032] Control sample: TC4 titanium alloy without laser pretreatment.
[0033] (2) Anodizing treatment
[0034] Put the TC4 titanium alloy sample 1 and the control sample after the laser pretreatment in step (1) into anhydrous acetone and ultrasonically clean them for 5-10 minutes, rinse them with distilled water after taking them out, put them into an alkaline degreasing solution, and set them at 60°C Soak for 20min, then wash with flowing hot water at 80°C, and then clean with flowing cold water; then put it into the anodic oxidation solution as the anode, use stainless steel as the cathode, the anode-to-cathode area ratio is 1:2...
Embodiment 2
[0038] The laser scanning speed is 1500mm / s, and the composition of the anodizing solution is: malic acid 25g / L, Na 2 SiO 3 5g / L, CaCl 2 3g / L, Na 2 HPO 4 3g / L, the solvent is deionized water. The current density of the pulsed power supply is 7A / dm 2 , the impulse frequency is 1Hz, the duty ratio is 50%, the temperature is 10°C, and the stirring speed is 100r / min, and the treatment is 60min. Others are prepared in the same way as sample 1, and the titanium alloy sample 2 with bionic coating is obtained, and the titanium alloy sample 2 is observed. Surface topography.
Embodiment 3
[0040] The laser scanning speed is 3000mm / s, and the composition of the anodizing solution is: malic acid 5g / L, Na 2 SiO 3 5g / L, CaCl 2 3g / L, Na 2 HPO 4 3g / L, the solvent is deionized water. The current density of the pulse power supply is 5A / dm 2, the impulse frequency is 1Hz, the duty ratio is 50%, the temperature is 10°C, and the stirring speed is 100r / min, and the treatment is 60min. The other operations are the same as the preparation of sample 1 to obtain the titanium alloy sample 3 with bionic coating. Observe its surface morphology.
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Abstract
The invention discloses a method for preparing a titanium alloy bionic coating through compounding of laser and anodic oxidation. The method comprises the following steps: placing titanium alloy subjected to laser pretreatment in absolute ethyl alcohol or acetone for ultrasonic cleaning for 5-10 min; taking out and thoroughly rinsing the titanium alloy with distilled water; placing the rinsed titanium alloy in an alkaline degreasing solution for soaking, and then taking out the soaked titanium alloy; sequentially washing the soaked titanium alloy with running hot water and running cold water; placing the washed titanium alloy in an anodic oxidation solution; and by taking stainless steel as the cathode, performing anodic oxidation treatment for 60-90 min to obtain the titanium alloy with a bionic coating. Compared with a traditional anodic oxidation method, the method provided by the invention has the advantages that before anodic oxidation, pollution-free laser is adopted to pre-process the surface of the titanium alloy, so that the surface microstructure of the titanium alloy can be adjusted more easily; besides, the anodic oxidation adopts the main ingredient of malic acid while such strong-acidity substances as hydrofluoric acid, sulfuric acid and nitric acid are not used in the whole process, high safety and no toxicity are achieved, and pollution to the environment and harms to a human body are reduced to the minimum; the bioactivity, the wear resistance and the corrosion resistance of the material are greatly improved, and the service life of an implant is prolonged.
Description
(1) Technical field [0001] The invention relates to a compound preparation method of a titanium alloy biomimetic coating, in particular to a combination of laser processing and anodic oxidation to prepare a biomimetic structure layer with good corrosion resistance and biological activity on the surface of the titanium alloy. (2) Background technology [0002] Titanium alloy has low density, high specific strength, good corrosion resistance and fatigue resistance, and is widely used in aerospace, national defense, automobile, medical and other fields. Especially in medical implants, because titanium alloy is biologically inert, it cannot form a chemical bond with bone, and its wear resistance and corrosion resistance have certain limitations. Therefore, people try various surface modification techniques to form a surface layer with a bionic structure on the surface of titanium alloys to comprehensively improve the surface properties of titanium alloys. [0003] As a surface ...
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