Method for preparing titanium alloy bionic coating through compounding of laser and anodic oxidation
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An anodic oxidation and titanium alloy technology, applied in the field of bionic structure layer, can solve the problems of uncontrollable surface pore structure and process pollution, etc., and achieve the effect of improving service life, accelerating element diffusion, and lowering the harm to human body
Active Publication Date: 2017-07-04
ZHEJIANG UNIV OF TECH
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[0005] 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
[0035] (1) Preparation of samples and reagents
[0036] Take 20×20×5mm TC4 titanium alloy and use 500w IPG fiber laser. Under the conditions of a laser power of 500W, a spot diameter of 0.1mm, a scanning distance of 0.06mm, and a scanning speed of 1000mm / s, the alloy surface was scanned to obtain the TC4 titanium alloy sample 1 after laser pretreatment.
[0037] Control sample: TC4 titanium alloy without laser pretreatment.
[0038] (2) Anodizing treatment
[0039] Put the TC4 titanium alloy sample 1 and the control sample after laser pretreatment in step (1) into anhydrous acetone for ultrasonic cleaning for 5-10 minutes, then rinse with distilled water and put them in an alkaline degreasing solution at 60°C. Soak for 20min, then wash with flowing hot water at 80℃ and then wash with cold water; then put it in anodizing solution as anode, using stainless steel as cathode, the area ratio of anode to cathode is 1:2, and the current density is 9A / dm in the pulse power supply. 2 , The pu...
Embodiment 2
[0043] 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 pulse power supply is 7A / dm 2 , The punching frequency is 1Hz, the duty ratio is 50%, the temperature is 10℃, and the stirring speed is 100r / min for 60min. The other same product 1 is prepared to obtain the titanium alloy sample 2 with the bionic coating, and observe it Surface topography.
Embodiment 3
[0045] 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 punching frequency is 1Hz, the duty cycle is 50%, the temperature is 10℃, and the stirring speed is 100r / min for 60min. The other operations are the same as the preparation of product 1, and the titanium alloy sample 3 with bionic coating is obtained. 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
[0001] (1) Technical field [0002] The invention relates to a composite preparation method of a titanium alloy bionic coating, in particular to a combination of laser processing and anodic oxidation to prepare a bionic structural layer with good corrosion resistance and biological activity on the surface of the titanium alloy. [0003] (2) Background technology [0004] Titanium alloy has low density, high specific strength, good corrosion resistance and fatigue resistance, and is widely used in aerospace, defense, automobile, medical and other fields. Especially in terms of medical implants, titanium alloys are biologically inert and cannot form chemical bonds with bones. At the same time, their wear resistance and corrosion resistance have certain limitations. Therefore, people try various surface modification technologies to form a surface layer with a bionic structure on the surface of the titanium alloy to comprehensively improve the surface properties of the titanium alloy. [...
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