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A kind of electrochemical polishing liquid and polishing method for nickel-titanium alloy

A nickel-titanium alloy, electrochemical technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of excessive electrolytic polishing in electrolytic polishing process, complicated follow-up process, hidden safety hazards, etc., to avoid Corrosion and harm, simple follow-up treatment, low cost effect

Active Publication Date: 2022-05-10
KOKA NANTONG LIFESCIENCES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patent can realize the polishing of the inner titanium alloy, it still has the problem that the electrolytic polishing process is prone to excessive electrolytic polishing, the follow-up process is complicated, the cost is high, and there are great potential safety hazards.

Method used

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  • A kind of electrochemical polishing liquid and polishing method for nickel-titanium alloy
  • A kind of electrochemical polishing liquid and polishing method for nickel-titanium alloy
  • A kind of electrochemical polishing liquid and polishing method for nickel-titanium alloy

Examples

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Embodiment 1

[0035] This embodiment provides an electrochemical polishing solution for nickel-titanium alloys, which comprises the first mixed solution with a concentration of 150-170 g / L obtained by mixing sodium fluorotitanate and ethylene glycol, and the volume fraction is 10%-15 % deionized water is added to the first mixed liquid to obtain a second mixed liquid, and ethanol with a volume fraction of 3-5% is added to the second mixed liquid to obtain a polishing liquid.

[0036] The additive of the electrolytic polishing solution in this embodiment is absolute ethanol, which is a polar substance and can dissolve part of the nickel salt to ensure the thickness of the salt film. In addition, ethanol can also adjust the viscosity of the solution to ensure the gloss of the metal surface.

Embodiment 2

[0038] This embodiment provides an electrochemical polishing method for nickel-titanium alloy, including the electrochemical polishing solution in Embodiment 1.

[0039] Electrochemical polishing methods such as figure 1 shown, including steps:

[0040] S1. subjecting the mechanically polished nickel-titanium alloy sheet to chemical degreasing and sandblasting pretreatment at room temperature to obtain the treated nickel-titanium alloy sheet;

[0041] S2. ultrasonically treating the treated nickel-titanium alloy sheet, drying the ultrasonically-treated nickel-titanium alloy sheet, and pickling the dried nickel-titanium alloy sheet to obtain a pickled nickel-titanium alloy sheet;

[0042] S3. placing the pickled nickel-titanium alloy sheet in a polishing solution for electrochemical polishing, and cleaning the polished nickel-titanium alloy sheet to obtain the first cleaned nickel-titanium alloy sheet;

[0043] S4. Put the nickel-titanium alloy sheet after the first cleaning ...

Embodiment 3

[0070] This embodiment provides a kind of electrochemical polishing method that is used for nickel-titanium alloy and the difference with embodiment 1 is: this embodiment compares with the mode of prior art (such as the polishing solution of acid-alcohol system), to Verify the effect of the present invention.

[0071] The electrochemical polishing method of the present invention is similar to that of Embodiment 2, and will not be repeated here.

[0072] The steps of the electrochemical polishing method using the polishing solution of the acid-alcohol system of the prior art are:

[0073] 1. Carry out normal temperature chemical degreasing and sandblasting pretreatment to the nickel-titanium alloy sheet after mechanical polishing to obtain the treated nickel-titanium alloy sheet. The normal temperature chemical degreasing formula and sandblasting treatment are similar to those in Example 2;

[0074] 2. ultrasonically treating the treated nickel-titanium alloy sheet, drying the...

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Abstract

The invention discloses an electrochemical polishing method for nickel-titanium alloy, comprising: S1. performing chemical degreasing and sandblasting pretreatment on the mechanically polished nickel-titanium alloy sheet at room temperature; S2. treating the treated nickel-titanium alloy Ultrasonic treatment of the sheet, drying the ultrasonically treated nickel-titanium alloy sheet, and pickling the dried nickel-titanium alloy sheet; S3. placing the pickled nickel-titanium alloy sheet in a polishing solution for electrochemical Polishing, and cleaning the polished nickel-titanium alloy sheet to obtain the first cleaned nickel-titanium alloy sheet; S4. putting the first cleaned nickel-titanium alloy sheet into a high-temperature furnace for high-temperature oxidation for a period of time, Cool the nickel-titanium alloy sheet after high temperature oxidation to room temperature, and clean the nickel-titanium alloy sheet cooled to room temperature to obtain the second cleaned nickel-titanium alloy sheet; S5. passivate the second cleaned nickel-titanium alloy sheet After a period of time, the passivated nickel-titanium alloy sheet is cleaned and dried to obtain the final nickel-titanium alloy sheet, which is sealed and preserved.

Description

technical field [0001] The invention relates to the technical field of biomedical materials, in particular to an electrochemical polishing liquid and a polishing method for nickel-titanium alloys. Background technique [0002] Cardiovascular disease refers to the pathological phenomenon that blood clots form on the inner wall of blood vessels due to various reasons, thereby affecting the heart and blood vessels. According to statistics, about 20 million people worldwide die from cardiovascular diseases. In the current surgical treatment of coronary heart disease, cardiovascular stent implantation is still the main treatment method for advanced patients. Blood clots are removed by implanting a stretchable cardiovascular stent to keep the blood vessel open and prevent it from breaking. Typically, cardiovascular stents are made of nickel-titanium alloys, cobalt-chromium alloys, and various types of stainless steel. Among these alloys, Nitinol has become the main choice. Nit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/22C23C8/10
CPCC25F3/22C23C8/10
Inventor 沈海龙吴明明陈大凯
Owner KOKA NANTONG LIFESCIENCES CO LTD