CN109609988B - Pipe fitting cleaning method before plating - Google Patents
Pipe fitting cleaning method before plating Download PDFInfo
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- CN109609988B CN109609988B CN201910006630.2A CN201910006630A CN109609988B CN 109609988 B CN109609988 B CN 109609988B CN 201910006630 A CN201910006630 A CN 201910006630A CN 109609988 B CN109609988 B CN 109609988B
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- pipe fitting
- pipe
- pickling
- cleaning method
- water
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- 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
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
-
- 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
Abstract
The invention discloses a cleaning method for a pipe fitting before plating, and belongs to the technical field of processing. The cleaning method comprises the following steps: heating the pipe fitting; after the pipe fitting is cooled, pickling the pipe fitting; washing the acid-washed pipe fitting with water for the first time; neutralizing the pipe fittings subjected to the first water washing; carrying out secondary water washing on the neutralized pipe fitting; and drying the pipe fitting. The invention can clean the pipe fitting before plating without affecting the quality of the pipe fitting.
Description
Technical Field
The invention belongs to the technical field of processing, and particularly relates to a cleaning method for a pipe fitting before plating.
Background
Before electroplating a metal pipe, the pipe needs to be cleaned before electroplating to remove various impurities and oil stains on the surface of the pipe.
Generally, the surface of the pipe is coated with a rust preventive oil before the pipe is stored in a warehouse, and if the pipe is stored in the warehouse for a long time, the rust preventive oil forms a chelate on the surface of the pipe. The chelate is not easy to clean, and the surfaces of the pipe fittings are usually cleaned by polishing, sand blasting and other polishing means, so that the treatment period is long, the pipe fittings are damaged, and the quality of the pipe fittings is reduced.
Disclosure of Invention
The embodiment of the invention provides a pipe fitting cleaning method before plating, which can be used for cleaning a pipe fitting before plating under the condition of not influencing the quality of the pipe fitting. The technical scheme is as follows:
the embodiment of the invention provides a cleaning method for a pipe fitting before plating, which comprises the following steps:
heating the pipe fitting;
after the pipe fitting is cooled, carrying out acid pickling on the pipe fitting;
carrying out primary water washing on the pipe fitting subjected to acid washing;
neutralizing the pipe after the first water washing;
carrying out secondary water washing on the neutralized pipe fitting;
and drying the pipe fitting.
Optionally, the warming the tube comprises:
feeding the pipe fitting into a heating furnace;
raising the temperature of the heating furnace to 350-450 ℃, and preserving the heat for 1-3 hours;
the temperature of the heating furnace is raised to 570-600 ℃, and the temperature is kept for 2-5 hours.
Optionally, the cleaning method comprises:
and after the temperature of the heating furnace is naturally cooled to the room temperature, taking the pipe fitting out of the heating furnace, and naturally cooling the pipe fitting to the room temperature.
Optionally, the pickling the pipe comprises:
sending the pipe fitting into a pickling tank for primary pickling;
taking the pipe fitting out of the pickling tank, and purging the inner wall of the pipe fitting;
and sending the pipe fitting into the pickling tank again, and carrying out secondary pickling.
Optionally, the first acid wash comprises:
controlling the pickling solution in the pickling tank at 18-25 ℃, and pickling the pipe fittings for 10-15 minutes.
Optionally, the pickling solution at least comprises hydrochloric acid, sulfuric acid and an acidic cleaning agent, wherein the concentration of the hydrochloric acid is 100-120 ml/l, and the concentration of the sulfuric acid is 80-100 ml/l.
Optionally, the second acid wash comprises:
controlling the pickling solution in the pickling tank at 18-25 ℃, and pickling the pipe fittings for 30-45 minutes.
Optionally, the purging the inner wall of the tubular comprises:
and (3) flushing the inner wall of the pipe fitting for 1-3 minutes by using water vapor, wherein the temperature of the water vapor is 100 ℃, and the pressure of the water vapor is 1-3 MPa.
Optionally, the first water wash comprises:
flushing the pipe fitting for 10-30 seconds by using a water gun, wherein the water temperature of the water gun is room temperature;
and (3) conveying the pipe fitting into a hot water tank for cleaning for 3-5 times, wherein the water temperature in the hot water tank is 70-100 ℃.
Optionally, the second water wash comprises:
sending the pipe fitting into a hot water tank for cleaning for 3-5 times, wherein the water temperature in the hot water tank is 70-100 ℃;
and flushing the pipe fitting for 10-30 seconds by using a water gun, wherein the water temperature of the water gun is room temperature.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
when the cleaning method provided by the embodiment of the invention is used for cleaning the pipe before plating, the pipe is firstly subjected to high-temperature treatment to scorch chelate on the surface of the pipe so as to facilitate subsequent stripping. And then, carrying out acid cleaning on the pipe subjected to high-temperature treatment to clean the chelate on the surface of the pipe. And then, the pipe fitting is washed for the first time so as to wash away acidic substances and residual impurities on the pipe fitting, thereby facilitating the subsequent neutralization treatment. The pipe fitting is thoroughly cleaned of acidic substances by neutralization treatment and washed with water for a second time to wash out the pipe fitting of alkaline substances. And finally, drying the pipe fitting to obtain the cleaned pipe fitting. That is to say, according to the cleaning method provided by the embodiment of the invention, the chelate on the surface of the pipe fitting is burnt by a high-temperature heating means, so that the pipe fitting can be easily peeled off by subsequent acid washing. In addition, the surface of the pipe fitting is not polished in the processes of heating, pickling, washing, neutralizing treatment and blow-drying, so that the quality of the pipe fitting is not affected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for cleaning a pipe before plating according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for cleaning a pipe before plating according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a cleaning method for a pipe fitting before plating, which comprises the following steps of:
step 101: the pipe is heated.
Step 102: after the pipe is cooled, the pipe is pickled.
Step 103: and carrying out primary water washing on the pipe fitting subjected to acid washing.
Step 104: and (4) neutralizing the pipe after the first water washing.
Step 105: and carrying out secondary water washing on the neutralized pipe fitting.
Step 106: and drying the pipe fitting.
When the cleaning method provided by the embodiment of the invention is used for cleaning the pipe before plating, the pipe is firstly subjected to high-temperature treatment to scorch chelate on the surface of the pipe so as to facilitate subsequent stripping. And then, carrying out acid cleaning on the pipe subjected to high-temperature treatment to clean the chelate on the surface of the pipe. And then, the pipe fitting is washed for the first time so as to wash away acidic substances and residual impurities on the pipe fitting, thereby facilitating the subsequent neutralization treatment. The pipe fitting is thoroughly cleaned of acidic substances by neutralization treatment and washed with water for a second time to wash out the pipe fitting of alkaline substances. And finally, drying the pipe fitting to obtain the cleaned pipe fitting. That is to say, according to the cleaning method provided by the embodiment of the invention, the chelate on the surface of the pipe fitting is burnt by a high-temperature heating means, so that the pipe fitting can be easily peeled off by subsequent acid washing. In addition, the surface of the pipe fitting is not polished in the processes of heating, pickling, washing, neutralizing treatment and blow-drying, so that the quality of the pipe fitting is not affected.
Fig. 2 is a flowchart of another pipe cleaning method before plating according to an embodiment of the present invention, and with reference to fig. 2, the cleaning method includes:
step 201: the tube is fed into a furnace.
Optionally, when warming the tubes, the distance between two adjacent tubes is not less than 30mm to ensure that each tube can be sufficiently heated.
Step 202: the temperature of the heating furnace is raised to 350-450 ℃ and kept for 1-3 hours.
It should be noted that the holding time in step 202 refers to the duration of the holding time after the temperature of the heating furnace is increased to 350-450 ℃.
Step 203: the temperature of the heating furnace is raised to 570-600 ℃ and the temperature is kept for 2-5 hours.
It should be noted that the holding time in step 203 refers to the holding time after the temperature of the heating furnace is increased to 570-600 ℃.
The heating of the pipe is realized through step 201 and 203, so that the chelate on the surface of the pipe can be burnt to facilitate the subsequent stripping.
Step 204: and after the temperature of the heating furnace is naturally cooled to the room temperature, taking the pipe fitting out of the heating furnace, and naturally cooling the pipe fitting to the room temperature.
Cooling of the pipe is achieved via step 204.
In the implementation mode, the heating furnace is firstly closed, so that the temperature of the furnace body in the heating furnace is naturally cooled to the room temperature, then the pipe fitting is taken out of the heating furnace, and the pipe fitting is continuously kept standing until the pipe fitting is naturally cooled to the room temperature.
Step 205: and (4) sending the pipe fitting into a pickling tank for primary pickling.
In this way, the chelate on the surface of the pipe may be corroded and loosened to facilitate blowing the chelate off the pipe via step 206.
During specific implementation, the pipe fitting is inclined by 5-15 degrees and hung into the pickling tank, so that the pipe fitting can stably slide in, and pickling solution is prevented from being stirred up.
Specifically, the pickling solution in the pickling tank is controlled at 18-25 ℃ to pickle the pipe fittings for 10-15 minutes.
Optionally, the pickling solution at least comprises hydrochloric acid, sulfuric acid and an acidic cleaning agent, wherein the concentration of the hydrochloric acid can be 100-120 ml/l, and the concentration of the sulfuric acid can be 80-100 ml/l.
Step 206: and taking the pipe fitting out of the pickling tank, and purging the inner wall of the pipe fitting.
In the concrete implementation, the inner wall of the pipe fitting is flushed by water vapor for 1-3 minutes, the temperature of the water vapor is 100 ℃, and the pressure of the water vapor is 1-3 MPa.
In the above implementation mode, since the chelate on the inner wall of the pipe fitting is thick, after the first time of pickling, the chelate on the inner wall of the pipe fitting is partially loosened, and the chelate on the inner wall of the pipe fitting needs to be blown away by means of purging.
Step 207: and (4) sending the pipe fitting into the pickling tank again, and carrying out secondary pickling.
Therefore, the chelate remained on the surface of the pipe fitting can be further corroded to ensure that the chelate on the surface of the pipe fitting is completely removed.
In the concrete implementation, the pipe fitting is hung into the pickling tank by adopting the same method as the step 205, and the pickling solution in the pickling tank is controlled at 18-25 ℃ for pickling the pipe fitting for 30-45 minutes.
Alternatively, the acid wash used for the second acid wash may be the same as the acid wash used for the first acid wash.
Step 208: and carrying out primary water washing on the pipe fitting subjected to acid washing.
In this way, the pipe surface may be initially washed of the pickling solution to facilitate the performance of step 209.
Specifically, step 208 may be implemented by:
firstly, flushing the pipe fitting for 10-30 seconds by a water gun, wherein the water temperature of the water gun is room temperature. Optionally, the squirt gun can receive the tap, directly wash through running water to the operation of being convenient for.
Then, the pipe fittings are sent into a hot water tank to be cleaned for 3-5 times, and the water temperature in the hot water tank is 70-100 DEG C
Step 209: and (4) neutralizing the pipe after the first water washing.
Thus, the residual pickling solution on the surface of the pipe can be completely removed.
Alternatively, the time of the neutralization treatment can be 1-3 minutes, and the neutralization solution can be a sodium carbonate solution with the mass concentration of 8-15%.
Step 210: and carrying out secondary water washing on the neutralized pipe fitting.
Thus, residual neutralization liquid on the surface of the pipe can be washed away.
Specifically, step 210 may be implemented by:
firstly, the pipe fitting is put into a hot water tank to be cleaned for 3-5 times, and the water temperature in the hot water tank is 70-100 ℃.
Then, the water gun is used for flushing the pipe fitting for 10-30 seconds, and the water temperature of the water gun is room temperature.
Step 211: and drying the pipe fitting.
During specific implementation, the pipe fitting is dried by clean, anhydrous and oilless compressed air.
When the cleaning method provided by the embodiment of the invention is used for cleaning the pipe before plating, the pipe is firstly subjected to high-temperature treatment to scorch chelate on the surface of the pipe so as to facilitate subsequent stripping. And then, carrying out acid cleaning on the pipe subjected to high-temperature treatment to clean the chelate on the surface of the pipe. And then, the pipe fitting is washed for the first time so as to wash away acidic substances and residual impurities on the pipe fitting, thereby facilitating the subsequent neutralization treatment. The pipe fitting is thoroughly cleaned of acidic substances by neutralization treatment and washed with water for a second time to wash out the pipe fitting of alkaline substances. And finally, drying the pipe fitting to obtain the cleaned pipe fitting. That is to say, according to the cleaning method provided by the embodiment of the invention, the chelate on the surface of the pipe fitting is burnt by a high-temperature heating means, so that the pipe fitting can be easily peeled off by subsequent acid washing. In addition, the surface of the pipe fitting is not polished in the processes of heating, pickling, washing, neutralizing treatment and blow-drying, so that the quality of the pipe fitting is not affected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A cleaning method before plating of a pipe, characterized in that the cleaning method is used for cleaning a chelate on a metal pipe, the chelate is formed by a long-time reaction between rust preventive oil on the metal pipe and the metal pipe, and the cleaning method comprises the following steps:
heating the pipe to burn the chelate on the surface of the pipe;
after the pipe fitting is cooled, carrying out acid pickling on the pipe fitting;
carrying out primary water washing on the pipe fitting subjected to acid washing;
neutralizing the pipe after the first water washing;
carrying out secondary water washing on the neutralized pipe fitting;
and drying the pipe fitting.
2. The cleaning method of claim 1, wherein the warming the tube comprises:
feeding the pipe fitting into a heating furnace;
raising the temperature of the heating furnace to 350-450 ℃, and preserving the heat for 1-3 hours;
the temperature of the heating furnace is raised to 570-600 ℃, and the temperature is kept for 2-5 hours.
3. The cleaning method according to claim 2, characterized in that the cleaning method comprises:
and after the temperature of the heating furnace is naturally cooled to the room temperature, taking the pipe fitting out of the heating furnace, and naturally cooling the pipe fitting to the room temperature.
4. The cleaning method of claim 1, wherein the pickling of the pipe comprises:
sending the pipe fitting into a pickling tank for primary pickling;
taking the pipe fitting out of the pickling tank, and purging the inner wall of the pipe fitting;
and sending the pipe fitting into the pickling tank again, and carrying out secondary pickling.
5. The cleaning method according to claim 4, wherein the first pickling comprises:
controlling the pickling solution in the pickling tank at 18-25 ℃, and pickling the pipe fittings for 10-15 minutes.
6. The cleaning method according to claim 5, wherein the pickling solution comprises at least hydrochloric acid, sulfuric acid and an acidic cleaning agent, wherein the concentration of the hydrochloric acid is 100 to 120ml/l, and the concentration of the sulfuric acid is 80 to 100 ml/l.
7. The cleaning method according to claim 6, wherein the second acid washing comprises:
controlling the pickling solution in the pickling tank at 18-25 ℃, and pickling the pipe fittings for 30-45 minutes.
8. The cleaning method of claim 4, wherein the purging the interior wall of the tubular member, comprises:
and (3) flushing the inner wall of the pipe fitting for 1-3 minutes by using water vapor, wherein the temperature of the water vapor is 100 ℃, and the pressure of the water vapor is 1-3 MPa.
9. The cleaning method according to claim 4, wherein the first water washing comprises:
flushing the pipe fitting for 10-30 seconds by using a water gun, wherein the water temperature of the water gun is room temperature;
and (3) conveying the pipe fitting into a hot water tank for cleaning for 3-5 times, wherein the water temperature in the hot water tank is 70-100 ℃.
10. The cleaning method according to claim 4, wherein the second water washing comprises:
sending the pipe fitting into a hot water tank for cleaning for 3-5 times, wherein the water temperature in the hot water tank is 70-100 ℃;
and flushing the pipe fitting for 10-30 seconds by using a water gun, wherein the water temperature of the water gun is room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910006630.2A CN109609988B (en) | 2019-01-04 | 2019-01-04 | Pipe fitting cleaning method before plating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910006630.2A CN109609988B (en) | 2019-01-04 | 2019-01-04 | Pipe fitting cleaning method before plating |
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| CN109609988A CN109609988A (en) | 2019-04-12 |
| CN109609988B true CN109609988B (en) | 2020-07-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1386907A (en) * | 2001-05-18 | 2002-12-25 | 天津市宇泰化工高科技有限公司 | Liquid for removing oil and rust from metal and its preparing process |
| CN107502905A (en) * | 2017-10-25 | 2017-12-22 | 苏州华丰不锈钢紧固件有限公司 | A kind of acid cleaning process for effectively removing thick oxide film |
| CN108441865A (en) * | 2018-03-09 | 2018-08-24 | 安徽金环电气设备有限责任公司 | A kind of handware recycling derusting pickle and its configuration method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3770630A (en) * | 1971-09-02 | 1973-11-06 | Dart Ind Inc | Treatment of electroless process and stripping solutions |
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2019
- 2019-01-04 CN CN201910006630.2A patent/CN109609988B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1386907A (en) * | 2001-05-18 | 2002-12-25 | 天津市宇泰化工高科技有限公司 | Liquid for removing oil and rust from metal and its preparing process |
| CN107502905A (en) * | 2017-10-25 | 2017-12-22 | 苏州华丰不锈钢紧固件有限公司 | A kind of acid cleaning process for effectively removing thick oxide film |
| CN108441865A (en) * | 2018-03-09 | 2018-08-24 | 安徽金环电气设备有限责任公司 | A kind of handware recycling derusting pickle and its configuration method |
Non-Patent Citations (1)
| Title |
|---|
| 锅底的油垢怎么去除;网名;《百度经验》;20170123;1-4 * |
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