CN110878417A - Acid pickling process for aluminum alloy section - Google Patents
Acid pickling process for aluminum alloy section Download PDFInfo
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- CN110878417A CN110878417A CN201911290203.8A CN201911290203A CN110878417A CN 110878417 A CN110878417 A CN 110878417A CN 201911290203 A CN201911290203 A CN 201911290203A CN 110878417 A CN110878417 A CN 110878417A
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- aluminum alloy
- alloy section
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- pickling
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses an aluminum alloy section acid pickling process which comprises the following steps of a, soaking an aluminum alloy section in acid liquor for ultrasonic acid pickling, wherein the ultrasonic frequency is 50-60KHz, the pickling time is 1-3min, a product A is obtained, B, washing the product A with high-pressure water flow, the flow velocity of the water flow is 30-40m/s, a product B is obtained, and c, drying the product B, and a finished product is obtained; in the step a, the acid solution consists of 50-80 parts by weight of dilute nitric acid, 10 parts by weight of hydrogen peroxide and 1 part by weight of sodium hydrogen fluoride, wherein the concentration of the nitric acid solution is 3mol/L, and the concentration of the hydrogen peroxide is 30%. The aluminum alloy section treated by the method has the advantage that the paint surface is not easy to peel off after paint spraying.
Description
Technical Field
The invention belongs to the field of pickling processes before painting of aluminum alloy sections.
Background
Before painting, the aluminum alloy section generally needs to be pickled to remove stains and oxide layers on the surface of the aluminum alloy section and improve the bonding strength of a paint surface. The existing pickling process is to soak the aluminum alloy section in acid liquor for pickling; washing the aluminum alloy section with water after acid washing to remove residual acid liquor on the surface; the aluminum alloy section is washed by water and dried, so that the aluminum alloy section is prevented from further oxidation under the action of moisture. The aluminum alloy section is easy to have the phenomenon of ash hanging after acid cleaning, namely, a reaction product of the acid solution and the aluminum alloy section is deposited on the surface of the aluminum alloy section, and the reaction product and the aluminum alloy section have certain adhesive force and are difficult to eliminate in the subsequent steps, and the paint surface is prevented from being effectively combined with the aluminum alloy section, so that the paint surface of the aluminum alloy section is easy to peel off after the paint is sprayed. Therefore, the aluminum alloy section treated by the existing pickling process has the defect that the painted surface is easy to peel off after painting.
Disclosure of Invention
The invention aims to provide an acid washing process for an aluminum alloy section. The aluminum alloy section treated by the method has the advantage that the paint surface is not easy to peel off after paint spraying.
The technical scheme of the invention is as follows: an acid washing process for an aluminum alloy section,
the pickling process of the aluminum alloy section comprises the following steps,
a. soaking the aluminum alloy section in acid liquor for ultrasonic pickling with ultrasonic frequency of 50-60KHz for 1-3min to obtain product A,
b. washing the product A with high-pressure water flow at a flow rate of 30-40m/s to obtain product B,
c. and drying the product B to obtain a finished product.
In the acid washing process of the aluminum alloy section, in the step a, the acid solution consists of 50-80 parts by weight of dilute nitric acid, 10 parts by weight of hydrogen peroxide and 1 part by weight of sodium hydrogen fluoride, wherein the concentration of the nitric acid solution is 3mol/L, and the concentration of the hydrogen peroxide is 30%.
In the pickling process of the aluminum alloy section, in the step a, the pickling temperature is 50-60 ℃.
In the pickling process of the aluminum alloy section, in the step a, the pickling temperature is 55 ℃.
In the pickling process of the aluminum alloy section, in the step b, the temperature of the high-pressure water flow is 60-80 ℃.
In the acid washing process of the aluminum alloy section, in the step b, the temperature of the high-pressure water flow is 70 ℃.
Compared with the prior art, the acid solution contains nitric acid, the aluminum alloy section reacts with the nitric acid to generate a large amount of heat, a large amount of bubbles are generated on the surface of the aluminum alloy section, reaction products are adhered to the bubbles, and the bubbles rapidly leave the aluminum alloy section under the action of ultrasonic waves, so that the aluminum alloy section is not easy to generate a phenomenon of ash hanging after acid washing. The hydrogen peroxide can prevent the aluminum alloy from yellowing under the action of nitric acid, maintain the original color of the aluminum alloy section and avoid the color difference of the aluminum alloy section after paint spraying. Because the aluminum alloy section is not coated with ash after being pickled, the paint surface formed by spraying paint is effectively combined with the aluminum alloy section, so that the paint surface is not easy to peel off. Therefore, the aluminum alloy section treated by the method has the advantage that the paint surface is not easy to peel off after paint spraying.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example 1. An acid cleaning process for an aluminum alloy section comprises the following steps,
a. soaking the aluminum alloy section in acid liquor for ultrasonic pickling with ultrasonic frequency of 55KHz for 2min to obtain product A,
b. washing the product A with high-pressure water flow with the flow velocity of 35m/s to obtain product B,
c. and drying the product B to obtain a finished product.
In the step a, the acid solution consists of 65 parts by weight of dilute nitric acid, 10 parts by weight of hydrogen peroxide and 1 part by weight of sodium hydrogen fluoride, wherein the concentration of the nitric acid solution is 3mol/L, and the concentration of the hydrogen peroxide is 30%.
In the step a, the pickling temperature is 55 ℃.
In the step b, the temperature of the high-pressure water flow is 70 ℃.
Example 2. An acid cleaning process for an aluminum alloy section comprises the following steps,
a. soaking the aluminum alloy section in acid liquor for ultrasonic pickling with ultrasonic frequency of 50KHz for 3min to obtain product A,
b. washing the product A with high-pressure water flow at the flow rate of 30m/s to obtain product B,
c. and drying the product B to obtain a finished product.
In the step a, the acid solution consists of 80 parts by weight of dilute nitric acid, 10 parts by weight of hydrogen peroxide and 1 part by weight of sodium hydrogen fluoride, wherein the concentration of the nitric acid solution is 3mol/L, and the concentration of the hydrogen peroxide is 30%.
In the step a, the pickling temperature is 50 ℃.
In the step b, the temperature of the high-pressure water flow is 80 ℃.
Example 3. An acid cleaning process for an aluminum alloy section comprises the following steps,
a. soaking the aluminum alloy section in acid liquor for ultrasonic pickling with ultrasonic frequency of 60KHz for 1min to obtain product A,
b. washing the product A with high-pressure water flow at a flow rate of 40m/s to obtain product B,
c. and drying the product B to obtain a finished product.
In the step a, the acid solution consists of 50 parts by weight of dilute nitric acid, 10 parts by weight of hydrogen peroxide and 1 part by weight of sodium hydrogen fluoride, wherein the concentration of the nitric acid solution is 3mol/L, and the concentration of the hydrogen peroxide is 30%.
In the step a, the pickling temperature is 60 ℃.
In the step b, the temperature of the high-pressure water flow is 60 ℃.
The aluminum alloy section treated by the method has the advantage that the paint surface is not easy to peel off after paint spraying.
Claims (6)
1. An acid washing process for an aluminum alloy section is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
a. soaking the aluminum alloy section in acid liquor for ultrasonic pickling with ultrasonic frequency of 50-60KHz for 1-3min to obtain product A,
b. washing the product A with high-pressure water flow at a flow rate of 30-40m/s to obtain product B,
c. and drying the product B to obtain a finished product.
2. The pickling process of the aluminum alloy profile according to claim 1, characterized in that: in the step a, the acid solution consists of 50-80 parts by weight of dilute nitric acid, 10 parts by weight of hydrogen peroxide and 1 part by weight of sodium hydrogen fluoride, wherein the concentration of the nitric acid solution is 3mol/L, and the concentration of the hydrogen peroxide is 30%.
3. The pickling process of the aluminum alloy profile according to claim 1, characterized in that: in the step a, the pickling temperature is 50-60 ℃.
4. The pickling process of the aluminum alloy profile according to claim 3, characterized in that: in the step a, the pickling temperature is 55 ℃.
5. The pickling process of the aluminum alloy profile according to claim 1, characterized in that: in the step b, the temperature of the high-pressure water flow is 60-80 ℃.
6. The pickling process of the aluminum alloy profile according to claim 5, characterized in that: in the step b, the temperature of the high-pressure water flow is 70 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911290203.8A CN110878417A (en) | 2019-12-16 | 2019-12-16 | Acid pickling process for aluminum alloy section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911290203.8A CN110878417A (en) | 2019-12-16 | 2019-12-16 | Acid pickling process for aluminum alloy section |
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| Publication Number | Publication Date |
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| CN110878417A true CN110878417A (en) | 2020-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911290203.8A Withdrawn CN110878417A (en) | 2019-12-16 | 2019-12-16 | Acid pickling process for aluminum alloy section |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009130248A1 (en) * | 2008-04-23 | 2009-10-29 | Martin-Nikolaus Meyn | Method for chemical deburring |
| CN104152927A (en) * | 2014-08-01 | 2014-11-19 | 北京新立机械有限责任公司 | Novel pickling solution for pretreating surfaces of aluminum and aluminum alloy |
| CN103318102B (en) * | 2013-07-10 | 2015-11-18 | 宁波华翔特雷姆汽车饰件有限公司 | A kind of automobile decoration layer structure and Rotating fields treatment process |
| CN107843478A (en) * | 2017-11-08 | 2018-03-27 | 宁波江丰电子材料股份有限公司 | Preparation method and ultra-pure aluminum sample impurity analysis method for the ultra-pure aluminum sample of GDMS detections |
-
2019
- 2019-12-16 CN CN201911290203.8A patent/CN110878417A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009130248A1 (en) * | 2008-04-23 | 2009-10-29 | Martin-Nikolaus Meyn | Method for chemical deburring |
| CN103318102B (en) * | 2013-07-10 | 2015-11-18 | 宁波华翔特雷姆汽车饰件有限公司 | A kind of automobile decoration layer structure and Rotating fields treatment process |
| CN104152927A (en) * | 2014-08-01 | 2014-11-19 | 北京新立机械有限责任公司 | Novel pickling solution for pretreating surfaces of aluminum and aluminum alloy |
| CN107843478A (en) * | 2017-11-08 | 2018-03-27 | 宁波江丰电子材料股份有限公司 | Preparation method and ultra-pure aluminum sample impurity analysis method for the ultra-pure aluminum sample of GDMS detections |
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| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200313 |