CN116815284A - Electrochemical polishing solution for cobalt-chromium alloy bracket, preparation method and polishing method - Google Patents
Electrochemical polishing solution for cobalt-chromium alloy bracket, preparation method and polishing method Download PDFInfo
- Publication number
- CN116815284A CN116815284A CN202310774123.XA CN202310774123A CN116815284A CN 116815284 A CN116815284 A CN 116815284A CN 202310774123 A CN202310774123 A CN 202310774123A CN 116815284 A CN116815284 A CN 116815284A
- Authority
- CN
- China
- Prior art keywords
- cobalt
- electrochemical polishing
- chromium alloy
- parts
- electrochemical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005498 polishing Methods 0.000 title claims abstract description 140
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical class [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 49
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 36
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229960000583 acetic acid Drugs 0.000 claims abstract description 18
- 239000012362 glacial acetic acid Substances 0.000 claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- XSUMSESCSPMNPN-UHFFFAOYSA-N propane-1-sulfonate;pyridin-1-ium Chemical compound C1=CC=NC=C1.CCCS(O)(=O)=O XSUMSESCSPMNPN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 19
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 15
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000003760 magnetic stirring Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 238000002161 passivation Methods 0.000 abstract description 7
- 230000003746 surface roughness Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 18
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 15
- 238000012360 testing method Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 230000010287 polarization Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000004083 survival effect Effects 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 206010053567 Coagulopathies Diseases 0.000 description 1
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000035602 clotting Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002526 effect on cardiovascular system Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000036262 stenosis Effects 0.000 description 1
- 208000037804 stenosis Diseases 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention relates to the field of electrochemical polishing, in particular to an electrochemical polishing solution for a cobalt-chromium alloy bracket, a preparation method and a polishing method, wherein the electrochemical polishing solution comprises the following components in parts by weight: 28-44 parts of glacial acetic acid, 7-9 parts of perchloric acid, 7-13 parts of ethylene glycol, 5-15 parts of pyridinium propane sulfonate and 19-53 parts of absolute ethyl alcohol. The electrochemical polishing solution of the cobalt-chromium alloy bracket can generate a layer of stable passivation film on the surface of the cobalt-chromium alloy bracket so as to improve the corrosion resistance, reduce passivation procedures and improve the production efficiency, and the polishing method adopting a rotary rolling mode can obviously improve the surface treatment quality of the cobalt-chromium alloy bracket, reduce surface salient points and pits and obviously reduce the surface roughness.
Description
Technical Field
The invention relates to the field of electrochemical polishing, in particular to an electrochemical polishing solution for a cobalt-chromium alloy bracket, a preparation method and a polishing method.
Background
Interventional vascular stent treatment is an effective method for solving cardiovascular stenosis, improving the survival probability of patients and improving the survival quality and survival time of the patients. Cobalt-chromium alloy materials are also being used in the production of stents more and more widely. However, after the cobalt-chromium alloy is subjected to primary processing, the surface state of the cobalt-chromium alloy is rough and not smooth, and the compatibility of the stent and blood is affected. The greater the roughness of the stent, the greater the area exposed to the blood, potentially leading to poor blood flow and a greater likelihood of clotting.
Patent publication No. CN113089071A discloses a polishing solution for electrochemical polishing of cobalt-chromium alloy brackets, wherein the polishing solution comprises concentrated sulfuric acid, ethylene glycol, citric acid and water, and patent publication No. CN111850668A discloses a surface modification method of a small-caliber pipe net-shaped metal sample. Although the electrochemical polishing of cobalt-chromium alloy can be realized, the defects of bulges, pits, inner and outer surface corrosion and the like are easy to occur, the polished surface has higher roughness, and passivation treatment is required to be additionally carried out after the electrochemical polishing is finished to increase the corrosion resistance.
Disclosure of Invention
The invention aims to provide an electrochemical polishing solution for a cobalt-chromium alloy bracket, a preparation method and a polishing method.
In order to solve the technical problems, the invention provides an electrochemical polishing solution for a cobalt-chromium alloy bracket, which comprises the following components in parts by weight: 28-44 parts of glacial acetic acid, 7-9 parts of perchloric acid, 7-13 parts of ethylene glycol, 5-15 parts of pyridinium propane sulfonate and 19-53 parts of absolute ethyl alcohol.
Further, the weight percentage concentration of the glacial acetic acid is 28% -44%, and the weight percentage concentration of the perchloric acid is 7% -9%.
Further, the weight percentage concentration of the glacial acetic acid is 28%, and the weight percentage concentration of the perchloric acid is 7%.
In still another aspect, the present invention further provides a method for preparing an electrochemical polishing solution for a cobalt-chromium alloy stent, including: 28 to 44 parts of glacial acetic acid, 7 to 9 parts of perchloric acid, 7 to 13 parts of ethylene glycol, 5 to 15 parts of pyridinium propane sulfonate and 19 to 53 parts of absolute ethyl alcohol are respectively weighed according to parts by weight; mixing the weighed glacial acetic acid, glycol and pyridinium propane sulfonate, stirring for 10-15 minutes at the rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a first premix; adding the weighed perchloric acid into absolute ethyl alcohol, mixing, stirring for 10-15 minutes at the rotating speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a second premix; and mixing the first premix and the second premix, stirring for 30-40 minutes at a rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare the electrochemical polishing solution.
In a third aspect, the present invention also provides an electrochemical polishing method for a cobalt-chromium alloy stent, including: and fixing the cobalt-chromium alloy bracket to be polished by using an electrochemical polishing device, and performing electrochemical polishing in the electrochemical polishing liquid in a rotary rolling mode.
Further, the parameters of the electrochemical polishing are that the polishing voltage is 15-30V, the polishing current is 1-7A, the polishing temperature is 5-25 ℃, the polishing time is 1-8 min, and the cathode-anode distance is 5-25 cm.
Further, the electrochemical polishing apparatus includes: the electrochemical polishing groove is used for containing the electrochemical polishing solution, and a cathode tube connected with a negative electrode of a direct current power supply is arranged in the electrochemical polishing groove; the magnetic stirrer is used for driving a magnetic rotor in the electrochemical polishing tank to stir the electrochemical polishing solution; the movable lifting platform is arranged above the electrochemical polishing groove; and the rotating mechanism is arranged on the movable lifting platform in a sliding manner and is used for driving the cobalt-chromium alloy bracket to be polished, which is connected with the positive electrode of the direct current power supply, to rotate in the electrochemical polishing solution.
Further, the rotation mechanism includes: the positioning installation seat is slidably installed on the movable lifting platform; the top positioning piece is fixed after sliding to a preset position on the positioning mounting seat, and a motor clamping groove for placing the rotating motor is formed below the top positioning piece; the titanium alloy core rod is arranged below the motor clamping groove and used for fixing the cobalt-chromium alloy bracket to be polished; and a fixing clamp for fixing the titanium alloy core rod and the output shaft of the rotating motor.
Further, the working process of the electrochemical polishing device comprises the following steps: fixing a cobalt-chromium alloy bracket to be polished; starting a magnetic stirrer, controlling a magnetic rotor to stir the electrochemical polishing solution, and switching on a direct current power supply; and placing the cobalt-chromium alloy support to be polished into electrochemical polishing solution, rotating the cobalt-chromium alloy support along the opposite direction of magnetic stirring, and enabling the cobalt-chromium alloy support to reciprocate, rise and fall in the electrochemical polishing solution.
Further, the stirring speed of the magnetic rotor is 200 r/min-1000 r/min.
The electrochemical polishing solution for the cobalt-chromium alloy bracket has the advantages that a stable passivation film can be formed on the surface of the cobalt-chromium alloy bracket, so that the corrosion resistance is improved, passivation procedures are reduced, the production efficiency is improved, the surface treatment quality of the cobalt-chromium alloy bracket can be obviously improved by adopting a polishing method in a rotary rolling mode, surface salient points and pits are reduced, and the surface roughness is obviously reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of an alternative electrochemical polishing apparatus in the electrochemical polishing method of a cobalt-chromium alloy stent of the present invention;
FIG. 2 is a schematic view showing the surface state of a cobalt-chromium alloy stent after polishing in example 1 of the present invention;
FIG. 3 is a schematic view showing the surface state of a cobalt-chromium alloy stent after polishing in comparative example 1 of the present invention;
FIG. 4 is a graph of electrochemical electrokinetic potential cycling polarization of a cobalt-chromium alloy stent after polishing in example 1 of the present invention;
FIG. 5 is a graph of electrochemical electrokinetic cyclic polarization of a cobalt-chromium alloy stent of comparative example 1 after polishing according to the present invention;
FIG. 6 is a graph of electrochemical electrokinetic cyclic polarization of a cobalt-chromium alloy stent after polishing in comparative example 2 of the present invention.
In the figure:
electrochemical polishing groove 1, cathode tube 11, magnetic stirrer 2, movable lifting platform 3, rotary mechanism 4, positioning mount 41, top positioning piece 42, motor clamping groove 43, rotary motor 44, titanium alloy core rod 45, and fixed fixture 46.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment 1 provides an electrochemical polishing solution for a cobalt-chromium alloy bracket, which is prepared by the following steps:
(1) 28 parts of glacial acetic acid, 7 parts of perchloric acid, 7 parts of ethylene glycol, 5 parts of pyridinium propane sulfonate and 53 parts of absolute ethyl alcohol are respectively weighed according to parts by weight;
(2) Mixing the weighed glacial acetic acid, glycol and pyridinium propane sulfonate, stirring for 10-15 minutes at the rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a first premix;
(3) Adding the weighed perchloric acid into absolute ethyl alcohol, mixing, stirring for 10-15 minutes at the rotating speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a second premix;
(4) And mixing the first premix and the second premix, stirring for 30-40 minutes at a rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare the electrochemical polishing solution.
Setting the parameters of electrochemical polishing to be 15-30V, the polishing current to be 1-7A, the polishing temperature to be 5-25 ℃, the polishing time to be 1-8 min, the cathode-anode spacing to be 5-25 cm, and the stirring speed to be 200-1000 r/min; after the cobalt-chromium alloy bracket to be polished is sleeved on the periphery of the titanium alloy core rod 45, the upper end of the titanium alloy core rod 45 is fixed through a fixing clamp 46, the cobalt-chromium alloy bracket to be polished is put into electrochemical polishing liquid to rotate along the opposite direction of magnetic stirring, and is made to reciprocate in the electrochemical polishing liquid to rise, fall and polish.
Example 2
The embodiment 2 provides an electrochemical polishing solution for a cobalt-chromium alloy bracket, which is prepared by the following steps:
(1) 36 parts of glacial acetic acid, 10 parts of perchloric acid, 8 parts of ethylene glycol, 10 parts of pyridinium propane sulfonate and 36 parts of absolute ethyl alcohol are respectively weighed according to parts by weight;
(2) Mixing the weighed glacial acetic acid, glycol and pyridinium propane sulfonate, stirring for 10-15 minutes at the rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a first premix;
(3) Adding the weighed perchloric acid into absolute ethyl alcohol, mixing, stirring for 10-15 minutes at the rotating speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a second premix;
(4) And mixing the first premix and the second premix, stirring for 30-40 minutes at a rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare the electrochemical polishing solution.
Setting the parameters of electrochemical polishing to 15-30V, polishing current to 1-7A, polishing temperature to 5-25 ℃, polishing time to 1-8 min, cathode-anode spacing to 5-25 cm, stirring speed to 200-1000 r/min, sleeving a cobalt-chromium alloy support to be polished on the periphery of a titanium alloy core rod 45, fixing the upper end of the titanium alloy core rod 45 through a fixing clamp 46, and placing the cobalt-chromium alloy support to be polished into electrochemical polishing liquid for standing and polishing.
Example 3
The embodiment 3 provides an electrochemical polishing solution for a cobalt-chromium alloy bracket, which is prepared by the following steps:
(1) 44 parts of glacial acetic acid, 13 parts of perchloric acid, 9 parts of ethylene glycol, 15 parts of pyridinium propane sulfonate and 19 parts of absolute ethyl alcohol are respectively weighed according to parts by weight;
(2) Mixing the weighed glacial acetic acid, glycol and pyridinium propane sulfonate, stirring for 10-15 minutes at the rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a first premix;
(3) Adding the weighed perchloric acid into absolute ethyl alcohol, mixing, stirring for 10-15 minutes at the rotating speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a second premix;
(4) And mixing the first premix and the second premix, stirring for 30-40 minutes at a rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare the electrochemical polishing solution.
The parameters of electrochemical polishing are set to be polishing voltage of 15-30V, polishing current of 1-7A, polishing temperature of 5-25 ℃, polishing time of 1-8 min, cathode-anode spacing of 5-25 cm, stirring speed of 200-1000 r/min, the cobalt-chromium alloy support to be polished is sleeved on the periphery of the titanium alloy core rod 45, the upper end of the titanium alloy core rod 45 is fixed through a fixing clamp 46, and the cobalt-chromium alloy support is polished by adopting an immersion polishing method.
Comparative example 1
The comparative example 1 provides an electrochemical polishing solution for a cobalt-chromium alloy bracket, which is prepared by the following steps:
(1) 50 parts of ethylene glycol, 1 part of citric acid, 10 parts of water and 40 parts of concentrated sulfuric acid are respectively weighed according to parts by weight;
(2) Mixing the weighed glycol, citric acid and water, and stirring for 10-15 minutes at a rotation speed of 400-600 rpm to obtain a premix;
(3) Pouring the weighed concentrated sulfuric acid into the premix solution, mixing, controlling the temperature to be not more than 55 ℃ in the preparation process, and stirring for 30-40 minutes at the rotating speed of 400-600 rpm to prepare the electrochemical polishing solution.
Setting the parameters of electrochemical polishing to 15-30V, polishing current to 1-7A, polishing temperature to 5-25 ℃, polishing time to 1-8 min, cathode-anode spacing to 5-25 cm, stirring speed to 200-1000 r/min, sleeving a cobalt-chromium alloy support to be polished on the periphery of a titanium alloy core rod 45, fixing the upper end of the titanium alloy core rod 45 through a fixing clamp 46, and placing the cobalt-chromium alloy support to be polished into electrochemical polishing liquid for standing and polishing.
Comparative example 2
The comparative example 2 provides an electrochemical polishing solution for a cobalt-chromium alloy bracket, and the preparation method comprises the following steps:
(1) Respectively weighing 70 parts of ethylene glycol, 2 parts of citric acid, 8 parts of water and 15 parts of concentrated sulfuric acid according to parts by weight;
(2) Mixing the weighed glycol, citric acid and water, and stirring for 10-15 minutes at a rotation speed of 400-600 rpm to obtain a premix;
(3) Pouring the weighed concentrated sulfuric acid into the premix solution, mixing, controlling the temperature to be not more than 55 ℃ in the preparation process, and stirring for 30-40 minutes at the rotating speed of 400-600 rpm to prepare the electrochemical polishing solution.
Setting the parameters of electrochemical polishing to 15-30V, polishing current to 1-7A, polishing temperature to 5-25 ℃, polishing time to 1-8 min, cathode-anode spacing to 5-25 cm, stirring speed to 200-1000 r/min, sleeving a cobalt-chromium alloy support to be polished on the periphery of a titanium alloy core rod 45, fixing the upper end of the titanium alloy core rod 45 through a fixing clamp 46, and placing the cobalt-chromium alloy support to be polished into electrochemical polishing liquid for standing and polishing.
The testing method comprises the following steps:
1. the cobalt-chromium alloy stents polished by the electrochemical polishing solutions of example 1, example 2, example 3, comparative example 1 and comparative example 2 were subjected to surface roughness test: the microscopic part of the surface is amplified by a laser scanning microscope for measurement, and the highest resolution reaches 10nm to obtain the roughness of the surface to be measured.
2. The corrosion resistance of cobalt-chromium alloy brackets polished by the electrochemical polishing solutions of example 1, example 2, example 3, comparative example 1 and comparative example 2 was evaluated by using electrochemical electrokinetic potential cycle polarization curves, and test samples were ultrasonically cleaned by using acetone, absolute ethyl alcohol and deionized water for 10 minutes, respectively. Potentiodynamic cyclic polarization test: after the open circuit voltage is stabilized, the scanning speed is 1mV/s, and the scanning interval is-1V (vs. OCP). The solutions were all PBS buffer at pH 7.
Test results:
by observing the surface state of the cobalt-chromium alloy after electrochemical polishing treatment, the surface state of the cobalt-chromium alloy support subjected to rotary rolling polishing in the example 1 is shown in fig. 1, the surface is bright and smooth, the defects of bulges, pits and the like are avoided, the surface state of the cobalt-chromium alloy support subjected to immersion polishing in the comparative example 1 is shown in fig. 2, and the defects of bulges, pits, corrosion of the inner surface and the outer surface and the like are overcome.
The electrochemical potentiodynamic cyclic polarization curves of the cobalt-chromium alloy stents polished in example 1, comparative example 1 and comparative example 2 are shown in fig. 3, 4 and 5, respectively, and the surface roughness test results and breakdown voltage test results of the cobalt-chromium alloy stents polished in example 1, example 2, example 3, comparative example 1 and comparative example 2 are shown in table 1 below.
TABLE 1
Compared with the surface roughness values of the cobalt-chromium alloy brackets polished by the electrochemical polishing solution in the examples 2 and 3, the surface roughness values of the cobalt-chromium alloy brackets in the example 1 are lower, so that the rotary rolling polishing method is adopted to lead the oxygen evolution reaction to be severe in the polishing process, thereby accelerating the dissolution and diffusion of the adhesive film and the generated oxide film on the surface of the anode cobalt-chromium alloy brackets, and the cobalt-chromium alloy brackets can be completely exposed in the electrochemical polishing solution, so that the surface convexities are continuously flat, uniform and bright, the surface convex points and pits can be effectively reduced, the surface roughness is obviously reduced, and the surface effect is improved.
Compared with the breakdown voltage of the cobalt-chromium alloy stent polished by the electrochemical polishing solution in comparative example 1 and comparative example 2, the breakdown voltage of the cobalt-chromium alloy stent in example 1, example 2 and example 3 is higher, and thus the electrochemical polishing solution of the cobalt-chromium alloy stent has better corrosion resistance.
Specifically, in the electrochemical polishing solution of the cobalt-chromium alloy bracket, perchloric acid can improve the conductivity of the electrochemical polishing solution, promote the current density distribution in the electrochemical polishing to be more uniform, increase the dissolution speed and improve the processing efficiency; glacial acetic acid plays a role of a stabilizer and has a corrosion-relieving effect; the pyridinium propane sulfonate and glycol are used as brightening agents, and the absolute ethyl alcohol is used as a cooling agent and a corrosion inhibitor.
The electrochemical polishing solution for the cobalt-chromium alloy bracket is adopted for polishing treatment, so that a passivation film can be generated on the surface of the cobalt-chromium alloy bracket, the corrosion resistance of the cobalt-chromium alloy bracket is effectively improved, passivation procedures are reduced, and the production efficiency is improved.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. The electrochemical polishing solution for the cobalt-chromium alloy bracket is characterized by comprising the following components in parts by weight:
28-44 parts of glacial acetic acid, 7-9 parts of perchloric acid, 7-13 parts of ethylene glycol, 5-15 parts of pyridinium propane sulfonate and 19-53 parts of absolute ethyl alcohol.
2. The electrochemical polishing solution for cobalt-chromium alloy stents according to claim 1, wherein,
the weight percentage concentration of the glacial acetic acid is 28% -44%, and the weight percentage concentration of the perchloric acid is 7% -9%.
3. The electrochemical polishing solution for cobalt-chromium alloy stents according to claim 2, wherein,
the weight percentage concentration of the glacial acetic acid is 28%, and the weight percentage concentration of the perchloric acid is 7%.
4. The preparation method of the electrochemical polishing solution for the cobalt-chromium alloy bracket is characterized by comprising the following steps of:
28 to 44 parts of glacial acetic acid, 7 to 9 parts of perchloric acid, 7 to 13 parts of ethylene glycol, 5 to 15 parts of pyridinium propane sulfonate and 19 to 53 parts of absolute ethyl alcohol are respectively weighed according to parts by weight;
mixing the weighed glacial acetic acid, glycol and pyridinium propane sulfonate, stirring for 10-15 minutes at the rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a first premix;
adding the weighed perchloric acid into absolute ethyl alcohol, mixing, stirring for 10-15 minutes at the rotating speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare a second premix;
and mixing the first premix and the second premix, stirring for 30-40 minutes at a rotation speed of 400-600 rpm, and controlling the temperature at 20-30 ℃ to prepare the electrochemical polishing solution.
5. An electrochemical polishing method for a cobalt-chromium alloy bracket, which is characterized by comprising the following steps:
fixing a cobalt-chromium alloy support to be polished by an electrochemical polishing device, and performing electrochemical polishing in the electrochemical polishing solution according to any one of claims 1-3 by means of rotary rolling.
6. The electrochemical polishing method of a cobalt-chromium alloy stent of claim 5, wherein,
the parameters of the electrochemical polishing are that the polishing voltage is 15-30V, the polishing current is 1-7A, the polishing temperature is 5-25 ℃, the polishing time is 1-8 min, and the cathode-anode distance is 5-25 cm.
7. The electrochemical polishing method of a cobalt-chromium alloy stent of claim 5, wherein,
the electrochemical polishing apparatus includes:
an electrochemical polishing tank (1) for containing the electrochemical polishing solution, wherein a cathode tube (11) connected with a negative electrode of a direct current power supply is arranged in the electrochemical polishing tank;
a magnetic stirrer (2) for driving a magnetic rotor in the electrochemical polishing tank (1) to stir the electrochemical polishing solution;
a movable lifting platform (3) arranged above the electrochemical polishing groove (1); and
the rotating mechanism (4) is arranged on the movable lifting platform (3) in a sliding manner and is used for driving the cobalt-chromium alloy support to be polished, which is connected with the positive electrode of the direct current power supply, to rotate in the electrochemical polishing solution.
8. The electrochemical polishing method of a cobalt-chromium alloy stent according to claim 7, wherein,
the rotation mechanism (4) includes:
a positioning mounting seat (41) which is slidably mounted on the movable lifting platform (3);
the top positioning piece (42) is fixed after sliding to a preset position on the positioning mounting seat (41), and a motor clamping groove (43) for placing a rotating motor (44) is arranged below the top positioning piece;
the titanium alloy core rod (45) is arranged below the motor clamping groove (43) and used for fixing the cobalt-chromium alloy bracket to be polished; and
and a fixing clamp (46) for fixing the titanium alloy core rod (45) and the output shaft of the rotating motor (44).
9. The electrochemical polishing method of a cobalt-chromium alloy stent according to claim 8, wherein,
the working process of the electrochemical polishing device comprises the following steps:
fixing a cobalt-chromium alloy bracket to be polished;
starting a magnetic stirrer (2), controlling a magnetic rotor to stir the electrochemical polishing solution, and switching on a direct current power supply;
and placing the cobalt-chromium alloy support to be polished into electrochemical polishing solution, rotating the cobalt-chromium alloy support along the opposite direction of magnetic stirring, and enabling the cobalt-chromium alloy support to reciprocate, rise and fall in the electrochemical polishing solution.
10. The electrochemical polishing method of a cobalt-chromium alloy stent according to claim 9, wherein,
the stirring speed of the magnetic rotor is 200 r/min-1000 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310774123.XA CN116815284A (en) | 2023-06-28 | 2023-06-28 | Electrochemical polishing solution for cobalt-chromium alloy bracket, preparation method and polishing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310774123.XA CN116815284A (en) | 2023-06-28 | 2023-06-28 | Electrochemical polishing solution for cobalt-chromium alloy bracket, preparation method and polishing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116815284A true CN116815284A (en) | 2023-09-29 |
Family
ID=88119820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310774123.XA Pending CN116815284A (en) | 2023-06-28 | 2023-06-28 | Electrochemical polishing solution for cobalt-chromium alloy bracket, preparation method and polishing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116815284A (en) |
-
2023
- 2023-06-28 CN CN202310774123.XA patent/CN116815284A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020186892A1 (en) | Method for preparing ultra-low-temperature weak current control metal material ebsd sample | |
| CN108118388B (en) | Ni-Ti alloy electrochemical polishing solution and polishing method | |
| CN106567122B (en) | Electrochemical polishing electrolyte for titanium and titanium alloy and polishing method thereof | |
| CN112160018B (en) | Method for preparing super martensitic stainless steel EBSD sample | |
| CN116815284A (en) | Electrochemical polishing solution for cobalt-chromium alloy bracket, preparation method and polishing method | |
| CN113481585A (en) | Electrolytic polishing solution and electrolytic polishing method for stainless steel | |
| CN110618153A (en) | Preparation method of electropolished titanium alloy large-size rod-shaped or plate-shaped sample | |
| CN117848798A (en) | Preparation method of EBSD sample of titanium and titanium alloy | |
| Mogoda et al. | Electrochemical behavior of titanium in NaF solutions and characterization of oxide film formed on its surface | |
| JP2014025126A (en) | Anodic oxide film of aluminum stock and method for producing the same | |
| CN117535776A (en) | Electropolishing preparation method of metal tungsten foil capable of obtaining excellent surface integrity | |
| FR2795433A1 (en) | Bath composition for electropolishing of titanium surfaces includes sulfuric, hydrofluoric and acetic acids | |
| CN109440181B (en) | Method for removing anodic oxidation Ni-Ti-O nano-pore disordered layer on surface of NiTi alloy | |
| CN116575106A (en) | Electrochemical treatment auxiliary equipment and method for hollow metal interventional instrument | |
| CN111551573A (en) | Rotary motion type automatic electrolytic polishing device and method for EBSD test sample | |
| CN113089071B (en) | Electrochemical polishing solution, preparation method thereof and polishing method of cobalt-chromium alloy intravascular stent | |
| CN113897664B (en) | Device and method for laser composite electrochemical polishing of titanium alloy | |
| JPS61101946A (en) | Mesh manufacturing system | |
| CN219772321U (en) | Electrolytic polishing device for arc-shaped sample | |
| Kestel | Polishing methods for metallic and ceramic transmission electron microscopy specimens: Revision 1 | |
| CN108677237A (en) | Pretreatment liquid and magnesium alloy differential arc oxidation pre-treating method and differential arc oxidation method for magnesium alloy differential arc oxidation | |
| CN104099645A (en) | Deep eutectic solution iron electroplating solution | |
| CN113340690A (en) | Preparation method of high-purity aluminum gold phase sample | |
| CN116555882A (en) | Electrolytic polishing device and method for arc-shaped sample | |
| CN219907915U (en) | Rotary rolling electrochemical polishing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |