Electropolishing process on the surface of cobalt-chromium metal.

TH28218UActive Publication Date: 2026-06-02NATIONAL SCIENCE TECHNOLOGY DEVELOPMENT AGENCY
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Patent Information

Application Number
TH2103002780
Authority / Receiving Office
TH · TH
Patent Type
Utility models
Current Assignee / Owner
Filing Date
2021-09-24
Publication Date
2026-06-02
Estimated Expiration
2027-09-23

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Abstract

OCR 09WP 20 / 05 / 2569 This invention relates to an electropolishing process for the surface of cobalt-chromium metal. It consists of the following steps. A. The preparation of the anode, which is a polished workpiece made of cobalt-chromium alloy. A CoCr alloy is bonded in place with titanium, and the cathode is made of copper. The anode and cathode are in an electrolyte solution containing phosphoric acid. (H3PO4) Sulfuric acid (H2SO4) Hydrofluoric acid (HF) Glycerol in solvents. Dissolves in water B. Supplying an electrical current of 0.04-0.15 amperes per square millimeter, calculating the current supplied per area. Cobalt-chromium alloys are treated with a potential difference of 22-24 volts for 0.5 - 6 minutes.
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Claims

OCR 09WP 20 / 05 / 2569 1. The electropolishing process on the surface of cobalt-chromium metal consists of the following steps: A. The placement of the anode, which is a polished workpiece made of cobalt alloy. Chromium (CoCr alloy) is bonded to the titanium electrode, which is the cathode. Copper metal is immersed at the anode and cathode in an electrolyte solution consisting of... Phosphoric acid (H3PO4) at a concentration of 9.70-9.80 molar. Sulfuric acid (H2SO4) with a concentration of 3.60-3.70 molar. Hydrofluoric acid (HF) with a concentration of 0.80-0.90 molar. Glycerol, concentration 0.03-0.04 molar. In an aqueous solvent. B. Electrical current supply of 0.04-0.15 amperes per square millimeter, calculated based on current supplied per area. Cobalt-chromium alloys were subjected to a potential difference of 22-24 volts for 0.5 - 6 minutes.

2. Electropolishing process on the surface of cobalt-chromium metal according to claim 1, where time This is within the range of 0.5 - 1 minute.

3. Electropolishing process on the surface of cobalt-chromium metal according to claim 1, where The electric current is in the range of 0.04-0.09 amperes per square millimeter.

4. The electropolishing process on the surface of cobalt-chromium metal, as per claim 1, also includes: Additionally, the cobalt-chromium alloy should be cleaned with alcohol beforehand. Step B.

5. Electropolishing process on the surface of cobalt-chromium metal, as per claim 1, which also includes... Additionally, a cleaning procedure for the cobalt-chromium alloy should be performed afterward. Step B. Clean according to the following steps: C. Washing with nitric acid solution. d. Washing with an alkaline solution, preferably ammonium hydroxide solution. Sodium bicarbonate solution, ammonia solution, or a mixture of these substances. as mentioned above e. Washing with alcohol.

6. Electropolishing process on the surface of cobalt-chromium metal according to claim 4 or 5, where The alcohol can be selected from isopropanol, ethanol, or a mixture of these substances. as mentioned above