CN110760829A - Brass passivation solution - Google Patents
Brass passivation solution Download PDFInfo
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- CN110760829A CN110760829A CN201911000217.1A CN201911000217A CN110760829A CN 110760829 A CN110760829 A CN 110760829A CN 201911000217 A CN201911000217 A CN 201911000217A CN 110760829 A CN110760829 A CN 110760829A
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- Prior art keywords
- brass
- passivation
- sulfuric acid
- water
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
- C23C22/37—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also hexavalent chromium compounds
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to a brass passivation solution, wherein solutes of the brass passivation solution are sulfuric acid, potassium dichromate and sodium fluoride, and a solvent of the brass passivation solution is water; the volume ratio of the mass of the sulfuric acid to the volume of the water is 5-10: 1, unit is gram/liter; the volume ratio of the mass of the potassium dichromate to the volume of the water is 90-150: 1, unit is gram/liter; the volume ratio of the mass of the sodium fluoride to the volume of the water is 3-5: 1 in grams/liter. The brass passivation solution of the invention has the advantages that the film forming speed is accelerated and thickened due to temperature passivation, and the film has high corrosion resistance due to the corrosion resistance and oxidation resistance of sodium fluoride. The passivation solution of the invention has simple operation and low cost, the thickness and corrosion resistance of the passivation film are twice higher than those of the passivation film prepared by the common method, and the passivation solution can be popularized and used for the passivation of various brass alloy material parts in war industry, spaceflight, shipping and the like.
Description
Technical Field
The invention belongs to a technical method for solving the problem of a thick passivation film of a brass member, and relates to a technical method for the thick passivation film of the brass member and a tank liquor preparation problem.
Background
At present, general brass parts can be passivated after removing oil and acid washing to remove oxides, the common passivation film has poor corrosion resistance, and the special requirements of products can not be ensured by the passivation of the common brass parts.
Disclosure of Invention
The purpose of the invention is: improve the corrosion resistance of the brass part passivation film thickness reinforcing film, and meet the requirements of the product.
The technical scheme of the invention is as follows:
providing a brass passivation solution, wherein solutes of the brass passivation solution are sulfuric acid, potassium dichromate and sodium fluoride, and a solvent of the brass passivation solution is water; the volume ratio of the mass of the sulfuric acid to the volume of the water is 5-10: 1, unit is gram/liter; the volume ratio of the mass of the potassium dichromate to the volume of the water is 90-150: 1, unit is gram/liter; the volume ratio of the mass of the sodium fluoride to the volume of the water is 3-5: 1 in grams/liter.
Further, the volume ratio of the mass of sulfuric acid to water is 7: 1 in grams/liter.
Further, the volume ratio of the mass of the potassium dichromate to the water is 130: 1 in grams/liter.
Further, the volume ratio of the mass of the sodium fluoride to the water is 4: 1 in grams/liter.
And then adding potassium dichromate into the dilute sulfuric acid, stirring uniformly, radiating and cooling, then adding sodium fluoride into the solution, and reacting fully to obtain the brass passivation solution.
Furthermore, the concentration range of the dilute sulfuric acid is 0.5-0.9%.
Further, the concentration range of the potassium dichromate is 8.2-12.9%.
Furthermore, the concentration range of the sodium fluoride is 0.3-0.4%.
The temperature of the brass passivating liquid is 45-55 ℃ when the brass passivating liquid passivates a workpiece, and the time for passivating the workpiece is 10-15 seconds.
The invention has the advantages that: the brass passivation solution of the invention has the advantages that the film forming speed is accelerated and thickened due to temperature passivation, and the film has high corrosion resistance due to the corrosion resistance and oxidation resistance of sodium fluoride. The passivation solution of the invention has simple operation and low cost, the thickness and corrosion resistance of the passivation film are twice higher than those of the passivation film prepared by the common method, and the passivation solution can be popularized and used for the passivation of various brass alloy material parts in war industry, spaceflight, shipping and the like.
Detailed Description
The present invention is described in further detail below.
Example 1
The rotor end plate material is brass and has strong passivation and corrosion resistance
The preparation method of the passivation solution comprises the following steps: and (2) injecting sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding sodium fluoride into the solution, and fully reacting to obtain the brass passivation solution.
The concentration of dilute sulfuric acid is 0.5%.
The concentration of potassium dichromate was 8.2%.
The concentration of sodium fluoride was 0.3%.
The temperature of the brass passivation solution is 45 ℃ when the workpiece is passivated, and the time is 15 seconds.
Example 2
The rotor end plate material is brass and has strong passivation and corrosion resistance
The preparation method of the passivation solution comprises the following steps: and (2) injecting sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding sodium fluoride into the solution, and fully reacting to obtain the brass passivation solution.
The concentration of dilute sulfuric acid was 0.9%.
The concentration of potassium dichromate was 12.9%.
The concentration of sodium fluoride was 0.4%.
The temperature of the brass passivation solution is 55 ℃ when the workpiece is passivated, and the time is 10 seconds.
Example 3
The contact material brass has strong passivation and corrosion resistance
The preparation method of the passivation solution comprises the following steps: and (2) injecting sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding sodium fluoride into the solution, and fully reacting to obtain the brass passivation solution.
The concentration of dilute sulfuric acid was 0.6%.
The concentration of potassium dichromate was 9.2%.
The concentration of sodium fluoride was 0.32%.
The temperature of the brass passivating liquid is 46 ℃ when the brass passivating liquid passivates a workpiece, and the time is 15 seconds.
Example 4
The brass material of the contact piece is brass which has strong passivation and corrosion resistance
The preparation method of the passivation solution comprises the following steps: and (2) injecting sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding sodium fluoride into the solution, and fully reacting to obtain the brass passivation solution.
The concentration of dilute sulfuric acid was 0.7%.
The concentration of potassium dichromate was 12.9%.
The concentration of sodium fluoride was 0.33%.
The temperature of the brass passivation solution is 50 ℃ when the workpiece is passivated, and the time is 10 seconds.
Example 5
The brass of the commutator material has strong passivation and corrosion resistance
The preparation method of the passivation solution comprises the following steps: and (2) injecting sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding sodium fluoride into the solution, and fully reacting to obtain the brass passivation solution.
The concentration of dilute sulfuric acid is 0.8%.
The concentration of potassium dichromate was 11%.
The concentration of sodium fluoride was 0.36%.
The temperature of the brass passivation solution is 45 ℃ when the workpiece is passivated, and the time is 10 seconds.
Example 6
The brass material of the commutator segment is brass, and has strong passivation and corrosion resistance
The preparation method of the passivation solution comprises the following steps: and (2) injecting sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding sodium fluoride into the solution, and fully reacting to obtain the brass passivation solution.
The concentration of dilute sulfuric acid was 0.66%.
The concentration of potassium dichromate is 12%.
The concentration of sodium fluoride was 0.38%.
The temperature of the brass passivation solution is 55 ℃ when the workpiece is passivated, and the time is 10 seconds.
Example 7
The conductive frame material brass has strong passivation and corrosion resistance
The preparation method of the passivation solution comprises the following steps: and (2) injecting sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding sodium fluoride into the solution, and fully reacting to obtain the brass passivation solution.
The concentration of dilute sulfuric acid is 0.58%.
The concentration of potassium dichromate was 8.9%.
The concentration of sodium fluoride was 0.32%.
The temperature of the brass passivation solution is 48 ℃ when the workpiece is passivated, and the time is 15 seconds.
Example 8
The material of the brush holder is brass, and the passivation and corrosion resistance are strong
The preparation method of the passivation solution comprises the following steps: and (2) injecting sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, then adding sodium fluoride into the solution, and fully reacting to obtain the brass passivation solution.
The concentration of dilute sulfuric acid is 0.85%.
The concentration of potassium dichromate was 11.9%.
The concentration of sodium fluoride was 0.39%.
The temperature of the brass passivation solution is 55 ℃ when the workpiece is passivated, and the time is 10 seconds.
Claims (8)
1. The brass passivation solution comprises the solutes of sulfuric acid, potassium dichromate and sodium fluoride, and the solvent of the brass passivation solution is water; the volume ratio of the mass of the sulfuric acid to the volume of the water is 5-10: 1, unit is gram/liter; the volume ratio of the mass of the potassium dichromate to the volume of the water is 90-150: 1, unit is gram/liter; the volume ratio of the mass of the sodium fluoride to the volume of the water is 3-5: 1 in grams/liter.
2. The brass passivating solution of claim 1, wherein: the volume ratio of the mass of sulfuric acid to water is 7: 1 in grams/liter.
3. The brass passivating solution of claim 1, wherein: the volume ratio of the mass of the potassium dichromate to the water is 130: 1 in grams/liter.
4. The brass passivating solution of claim 1, wherein: the ratio of the mass of sodium fluoride to the volume of water is 4: 1 in grams/liter.
5. And adding sulfuric acid into water to form dilute sulfuric acid, uniformly stirring, radiating and cooling, adding potassium dichromate into the dilute sulfuric acid, uniformly stirring, radiating and cooling, adding sodium fluoride into the solution, and reacting fully to obtain the brass passivation solution.
6. The method for preparing a brass passivating solution as defined in claim 1, wherein: the concentration range of the dilute sulfuric acid is 0.5-0.9%.
7. The method for preparing a brass passivating solution as defined in claim 1, wherein: the concentration range of the potassium dichromate is 8.2-12.9%.
8. The method for preparing a brass passivating solution as defined in claim 1, wherein: the concentration range of the sodium fluoride is 0.3-0.4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911000217.1A CN110760829A (en) | 2019-10-21 | 2019-10-21 | Brass passivation solution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911000217.1A CN110760829A (en) | 2019-10-21 | 2019-10-21 | Brass passivation solution |
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|---|---|
| CN110760829A true CN110760829A (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911000217.1A Pending CN110760829A (en) | 2019-10-21 | 2019-10-21 | Brass passivation solution |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046197A (en) * | 1989-04-03 | 1990-10-17 | 陈惠国 | Many rare earth metals additive for chrome-plating and manufacturing process |
| CN1258760A (en) * | 1999-12-30 | 2000-07-05 | 上海交通大学 | Black inactivation process for zinc-nickel alloy coating |
| CN101781763A (en) * | 2010-04-01 | 2010-07-21 | 中国兵器工业第五九研究所 | Preparation method of cast aluminum alloy film coat |
-
2019
- 2019-10-21 CN CN201911000217.1A patent/CN110760829A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046197A (en) * | 1989-04-03 | 1990-10-17 | 陈惠国 | Many rare earth metals additive for chrome-plating and manufacturing process |
| CN1258760A (en) * | 1999-12-30 | 2000-07-05 | 上海交通大学 | Black inactivation process for zinc-nickel alloy coating |
| CN101781763A (en) * | 2010-04-01 | 2010-07-21 | 中国兵器工业第五九研究所 | Preparation method of cast aluminum alloy film coat |
Non-Patent Citations (2)
| Title |
|---|
| 唐军 主编: "《表面处理工技能》", 31 August 1992, 航空工业出版社 * |
| 赵文轸: "《金属材料表面新技术》", 30 November 1992, 西安交通大学出版社 * |
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Application publication date: 20200207 |