CN114438564B - Dehydrogenation treatment process for bearing bush machining - Google Patents
Dehydrogenation treatment process for bearing bush machining Download PDFInfo
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- CN114438564B CN114438564B CN202210136310.0A CN202210136310A CN114438564B CN 114438564 B CN114438564 B CN 114438564B CN 202210136310 A CN202210136310 A CN 202210136310A CN 114438564 B CN114438564 B CN 114438564B
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- bearing bush
- dehydrogenation
- temperature
- hours
- bearing
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- 238000006356 dehydrogenation reaction Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000003754 machining Methods 0.000 title abstract description 4
- 239000002253 acid Substances 0.000 claims abstract description 36
- 238000002161 passivation Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005260 corrosion Methods 0.000 claims abstract description 11
- 230000007797 corrosion Effects 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000005554 pickling Methods 0.000 claims abstract description 9
- 230000009286 beneficial effect Effects 0.000 claims abstract description 7
- 238000007865 diluting Methods 0.000 claims abstract description 6
- 239000003085 diluting agent Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 34
- 229910052739 hydrogen Inorganic materials 0.000 claims description 19
- 239000001257 hydrogen Substances 0.000 claims description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000001994 activation Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000004913 activation Effects 0.000 abstract description 3
- 238000007747 plating Methods 0.000 description 6
- 238000009713 electroplating Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Sliding-Contact Bearings (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention provides a dehydrogenation treatment process for bearing bush machining, which belongs to the technical field of dehydrogenation treatment, and comprises the following steps of: the bearing bush is sprayed and cleaned for 10 minutes by a high-pressure water gun, and is washed by high-pressure water, so that the passivation film on the surface of the bearing bush is peeled off, and the bearing bush is subjected to slight black attachment falling; diluting acid liquor and diluent in a ratio of 18:4.6, then placing the bearing bush into an acid pickling tank for soaking for 30-40 seconds for the activation of the bearing bush, and dissolving a passivation thin layer on the surface after weak corrosion of the acid liquor to increase the surface activity and brighten the surface, thereby being beneficial to forming a good passivation film; the tin foil is used for being wrapped independently and is placed into a vacuum furnace, the furnace temperature is adjusted to be more than 200 ℃, the secondary dehydrogenation time is 2 hours, so that the best dehydrogenation effect can be achieved, and a passivation film cannot be formed on the outer surface of the bearing bush.
Description
Technical Field
The invention belongs to the technical field of dehydrogenation treatment, and particularly relates to a dehydrogenation treatment process for bearing bush machining.
Background
The dehydrogenation is an indispensable key step in the electroplating process. With the increasing demands on product quality and process technology in recent years, many disadvantages of the original process are more prominent. In order to unify standard and standard management, the prior process is carefully analyzed, and a special technical specification for removing hydrogen is formulated for all elastic parts, thin-wall parts (D is less than or equal to 1 mm) and parts with higher requirements on tensile strength in combination with production practice, so that the hydrogen brittleness of the product is reduced to the maximum extent, and the quality and reliability of the product are improved. And simultaneously meets the hydrogen removal process requirements of various plating parts such as zinc plating, silver plating, cadmium plating and the like.
The traditional dehydrogenation treatment process mostly adopts an oil temperature heating or vacuum furnace heating mode to remove the hydrogen on the surface of the workpiece, but after the high-temperature dehydrogenation, a thin and weak passivation film is generated on the surface of the plating layer, and if the color passivation is directly carried out after the dehydrogenation, the passivation film is dark, has no brightness and color film, and the corrosion resistance is greatly reduced.
Therefore, the invention of a dehydrogenation treatment process for bearing bush processing is very necessary.
Disclosure of Invention
In order to solve the technical problems, the invention provides a dehydrogenation treatment process for bearing bush processing, which aims to solve the problems that after high-temperature dehydrogenation, a thin and weak passivation film is generated on the surface of a plating layer, and if the passivation film is directly subjected to color passivation after dehydrogenation, the passivation film is dark, has no brightness and color film and the corrosion resistance is greatly reduced. The dehydrogenation treatment process for processing the bearing bush comprises the following steps of:
step one: heating to remove hydrogen, and performing hydrogen removal operation on the bearing bush for 5-8 hours by utilizing high temperature;
step two: after the temperature of the bearing bush is cooled to the room temperature, the bearing bush is sprayed and cleaned for 10 minutes by a high-pressure water gun, and the bearing bush is washed by high-pressure water, so that a passivation film on the surface of the bearing bush is peeled off the bearing bush;
step three: weak corrosion of acid liquor, diluting the acid liquor and the diluent in a ratio of 20:5, and then placing the bearing bush into an acid pickling tank for soaking;
step four: acid liquor is removed and cleaned, the bearing bush after acid cleaning is placed on a workpiece placing frame, and high-pressure water is used for spray cleaning for 1-15 minutes again, so that the acid liquor on the bearing bush is completely washed away;
step five: and (3) secondary dehydrogenation, wrapping the cleaned bearing bush by using tinfoil, and putting the bearing bush into a vacuum furnace for dehydrogenation.
Preferably, the first step: heating and removing hydrogen, namely performing hydrogen removing operation on the bearing bush at a high temperature for 5-8 hours, heating and removing hydrogen on the bearing bush in three hours, pouring heat conduction oil into a heating kettle, heating the heat conduction oil to 260 ℃, then placing the bearing bush into the heating kettle for heat soaking for 5-8 hours, paying attention to the change of the oil temperature during heating, ensuring that the lowest oil temperature cannot be lower than 200 ℃, and ensuring that the bearing bush is subjected to heat treatment in the heat conduction oil with the temperature of more than 200 ℃ for more than five hours.
Preferably, the step two: and (3) cold water washing, namely after the temperature of the bearing bush is cooled to 15-30 ℃, spraying and washing the bearing bush for 10 minutes by utilizing a high-pressure water gun, flushing the bearing bush by utilizing high-pressure water, and peeling a passivation film on the surface of the bearing bush.
Preferably, the step three: and (3) weakly corroding the acid liquor, and then placing the bearing bush into an acid pickling tank to be soaked for 30-40 seconds for activating the bearing bush.
Preferably, the activation process of the bearing bush comprises the following steps:
H 2 SO 4 (Q＝1.84g/L)：10～30g/L
or (b)
HNO 3 (q=1.42 g/L): 10-30 g/L temperature: room temperature for 20s; after weak corrosion by acid liquor, the passivation thin layer on the surface is dissolved, so that the surface activity is increased, and the surface is bright, thereby being beneficial to forming a good passivation film.
Preferably, in the fifth step, the cleaned bearing bush is individually wrapped by using tinfoil, and is placed into a vacuum furnace, the furnace temperature is adjusted to be more than 200 ℃, and the secondary dehydrogenation time is 2 hours.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of carrying out dehydrogenation operation on a bearing bush at high temperature for 5-8 hours, heating and dehydrogenating the bearing bush in three hours of electroplating, pouring heat conduction oil into a heating kettle, heating the heat conduction oil to 260 ℃, then placing the bearing bush into the heating kettle for heat soaking for 5-8 hours, paying attention to the change of oil temperature during heating, keeping the lowest oil temperature to be not lower than 200 ℃, and ensuring that the bearing bush is heated in the heat conduction oil above 200 ℃ for more than five hours; after the temperature of the bearing bush is cooled to 15-30 ℃, the bearing bush is sprayed and cleaned for 10 minutes by utilizing a high-pressure water gun, the bearing bush is washed by utilizing high-pressure water, a passivation film on the surface of the bearing bush is peeled off, when the bearing bush is cleaned, the high-pressure water gun adopts a fan-shaped nozzle to spray water in a fan shape, and the inner surface and the outer surface of the bearing bush are cleaned in a carpet mode, and the condition that a little black attachment on the bearing bush falls off is adopted; diluting acid liquor and diluent in a ratio of 18:4.6, then placing the bearing bush into an acid pickling tank for soaking for 30-40 seconds for the activation of the bearing bush, and dissolving a passivation thin layer on the surface after weak corrosion of the acid liquor to increase the surface activity and brighten the surface, thereby being beneficial to forming a good passivation film; the tin foil is used for being wrapped independently and is placed into a vacuum furnace, the furnace temperature is adjusted to be more than 200 ℃, the secondary dehydrogenation time is 2 hours, so that the best dehydrogenation effect can be achieved, and a passivation film cannot be formed on the outer surface of the bearing bush.
Detailed Description
The invention is further described below:
examples:
the invention provides a dehydrogenation treatment process for bearing bush processing, which comprises the following steps of:
step one: heating to remove hydrogen, and performing hydrogen removal operation on the bearing bush for 5-8 hours by utilizing high temperature;
step two: after the temperature of the bearing bush is cooled to the room temperature, the bearing bush is sprayed and cleaned for 10 minutes by a high-pressure water gun, and the bearing bush is washed by high-pressure water, so that a passivation film on the surface of the bearing bush is peeled off the bearing bush;
step three: weak corrosion of acid liquor, diluting the acid liquor and the diluent in a ratio of 20:5, and then placing the bearing bush into an acid pickling tank for soaking;
step four: acid liquor is removed and cleaned, the bearing bush after acid cleaning is placed on a workpiece placing frame, and high-pressure water is used for spray cleaning for 1-15 minutes again, so that the acid liquor on the bearing bush is completely washed away;
step five: and (3) secondary dehydrogenation, wrapping the cleaned bearing bush by using tinfoil, and putting the bearing bush into a vacuum furnace for dehydrogenation.
Preferably, the first step: heating and removing hydrogen, namely performing hydrogen removing operation on the bearing bush at a high temperature for 5-8 hours, heating and removing hydrogen on the bearing bush in three hours, pouring heat conduction oil into a heating kettle, heating the heat conduction oil to 260 ℃, then placing the bearing bush into the heating kettle for heat soaking for 5-8 hours, paying attention to the change of the oil temperature during heating, ensuring that the lowest oil temperature cannot be lower than 200 ℃, and ensuring that the bearing bush is subjected to heat treatment in the heat conduction oil with the temperature of more than 200 ℃ for more than five hours.
Preferably, the step two: and (3) cold water washing, namely after the temperature of the bearing bush is cooled to 15-30 ℃, spraying and washing the bearing bush for 10 minutes by utilizing a high-pressure water gun, flushing the bearing bush by utilizing high-pressure water, and peeling a passivation film on the surface of the bearing bush.
Preferably, the step three: and (3) weakly corroding the acid liquor, and then placing the bearing bush into an acid pickling tank to be soaked for 30-40 seconds for activating the bearing bush.
Preferably, the activation process of the bearing bush comprises the following steps:
H 2 SO 4 (Q＝1.84g/L)：10～30g/L
or (b)
HNO 3 (Q＝1.42g/L)：10～30g/L
Temperature: room temperature for 20s; after weak corrosion by acid liquor, the passivation thin layer on the surface is dissolved, so that the surface activity is increased, and the surface is bright, thereby being beneficial to forming a good passivation film.
Preferably, in the fifth step, the cleaned bearing bush is individually wrapped by using tinfoil, and is placed into a vacuum furnace, the furnace temperature is adjusted to be more than 200 ℃, and the secondary dehydrogenation time is 2 hours.
Principle of operation
In the invention, the high temperature is utilized to carry out dehydrogenation operation on the bearing bush for 5-8 hours, the bearing bush is heated and dehydrogenated within three hours of electroplating, heat conduction oil is poured into a heating kettle, the heat conduction oil is heated to 260 ℃, then the bearing bush is put into the heating kettle to be soaked for 5-8 hours, the change of the oil temperature is noted during the heating, the lowest oil temperature cannot be lower than 200 ℃, and the bearing bush is ensured to be heated in the heat conduction oil with the temperature of more than 200 ℃ for more than five hours; after the temperature of the bearing bush is cooled to 15-30 ℃, the bearing bush is sprayed and cleaned for 10 minutes by utilizing a high-pressure water gun, the bearing bush is washed by utilizing high-pressure water, a passivation film on the surface of the bearing bush is peeled off, when the bearing bush is cleaned, the high-pressure water gun adopts a fan-shaped nozzle to spray water in a fan shape, and the inner surface and the outer surface of the bearing bush are cleaned in a carpet mode, and the condition that a little black attachment on the bearing bush falls off is adopted; diluting acid liquor and diluent in a ratio of 18:4.6, then placing the bearing bush into an acid pickling tank for soaking for 30-40 seconds for the activation of the bearing bush, and dissolving a passivation thin layer on the surface after weak corrosion of the acid liquor to increase the surface activity and brighten the surface, thereby being beneficial to forming a good passivation film; the tin foil is used for being wrapped independently and is placed into a vacuum furnace, the furnace temperature is adjusted to be more than 200 ℃, the secondary dehydrogenation time is 2 hours, so that the best dehydrogenation effect can be achieved, and a passivation film cannot be formed on the outer surface of the bearing bush.
By utilizing the technical scheme of the invention or under the inspired by the technical scheme of the invention, a similar technical scheme is designed by a person skilled in the art, so that the technical effects are achieved, and the technical scheme falls into the protection scope of the invention.
Claims (6)
1. The dehydrogenation treatment process for processing the bearing bush is characterized by comprising the following steps of: the method comprises the following steps:
step one: heating to remove hydrogen, and performing hydrogen removal operation on the bearing bush for 5-8 hours by utilizing high temperature;
step two: after the temperature of the bearing bush is cooled to the room temperature, the bearing bush is sprayed and cleaned for 10 minutes by a high-pressure water gun, and the bearing bush is washed by high-pressure water, so that a passivation film on the surface of the bearing bush is peeled off the bearing bush;
step three: weak corrosion of acid liquor, diluting the acid liquor and the diluent in a ratio of 20:5, and then placing the bearing bush into an acid pickling tank for soaking;
step four: acid liquor is removed and cleaned, the bearing bush after acid cleaning is placed on a workpiece placing frame, and high-pressure water is used for spray cleaning for 1-15 minutes again, so that the acid liquor on the bearing bush is completely washed away;
step five: and (3) secondary dehydrogenation, wrapping the cleaned bearing bush by using tinfoil, and putting the bearing bush into a vacuum furnace for dehydrogenation.
2. A process for the dehydrogenation treatment of a bearing shell according to claim 1, characterized in that: the first step is as follows: heating and removing hydrogen, namely performing hydrogen removing operation on the bearing bush at a high temperature for 5-8 hours, heating and removing hydrogen on the bearing bush in three hours, pouring heat conduction oil into a heating kettle, heating the heat conduction oil to 260 ℃, then placing the bearing bush into the heating kettle for heat soaking for 5-8 hours, paying attention to the change of the oil temperature during heating, ensuring that the lowest oil temperature cannot be lower than 200 ℃, and ensuring that the bearing bush is subjected to heat treatment in the heat conduction oil with the temperature of more than 200 ℃ for more than five hours.
3. A process for the dehydrogenation treatment of a bearing shell according to claim 2, characterized in that: the second step is as follows: and (3) cold water washing, namely after the temperature of the bearing bush is cooled to 15-30 ℃, spraying and washing the bearing bush for 10 minutes by utilizing a high-pressure water gun, flushing the bearing bush by utilizing high-pressure water, and peeling a passivation film on the surface of the bearing bush.
4. A process for the dehydrogenation treatment of a bearing shell according to claim 1, characterized in that: and step three: and (3) weakly corroding the acid liquor, and then placing the bearing bush into an acid pickling tank to be soaked for 30-40 seconds for activating the bearing bush.
5. The dehydrogenation process for bearing bush processing according to claim 4, wherein: the activation process of the bearing bush comprises the following steps:
h with a density of 1.84g/L 2 SO 4 ：10～30g/L
Or (b)
HNO having a density of 1.42g/L 3 ：10～30g/L
Temperature: room temperature for 20s; after weak corrosion by acid liquor, the passivation thin layer on the surface is dissolved, so that the surface activity is increased, and the surface is bright, thereby being beneficial to forming a good passivation film.
6. A process for the dehydrogenation treatment of a bearing shell according to claim 2, characterized in that: and fifthly, in the secondary dehydrogenation, the cleaned bearing bush is individually wrapped by using tinfoil, and is placed into a vacuum furnace, the furnace temperature is adjusted to be more than 200 ℃, and the secondary dehydrogenation time is 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210136310.0A CN114438564B (en) | 2022-02-15 | 2022-02-15 | Dehydrogenation treatment process for bearing bush machining |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210136310.0A CN114438564B (en) | 2022-02-15 | 2022-02-15 | Dehydrogenation treatment process for bearing bush machining |
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| Publication Number | Publication Date |
|---|---|
| CN114438564A CN114438564A (en) | 2022-05-06 |
| CN114438564B true CN114438564B (en) | 2024-03-29 |
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|---|---|---|---|
| CN202210136310.0A Active CN114438564B (en) | 2022-02-15 | 2022-02-15 | Dehydrogenation treatment process for bearing bush machining |
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