CN110815059A - Internal spraying corrosion prevention process for corrosion-prevention steel pipe - Google Patents
Internal spraying corrosion prevention process for corrosion-prevention steel pipe Download PDFInfo
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- CN110815059A CN110815059A CN201911194225.4A CN201911194225A CN110815059A CN 110815059 A CN110815059 A CN 110815059A CN 201911194225 A CN201911194225 A CN 201911194225A CN 110815059 A CN110815059 A CN 110815059A
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- Prior art keywords
- spraying
- steel pipe
- paint
- anticorrosion
- wall
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
- B24C9/003—Removing abrasive powder out of the blasting machine
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses an internal spraying anticorrosion process for an anticorrosion steel pipe, which comprises the following steps: preparing, inner sand blasting, inner purging, inner spraying (first bottom), inner spraying (one side), inner spraying (second bottom), inner spraying (two sides), detecting, packaging and the like. According to the internal spraying anticorrosion process for the anticorrosion steel pipe, spraying operation is carried out by designing a spraying mode of twice priming paint and twice finishing paint, a single-layer paint film is completed step by step, the problem of the paint film is conveniently and timely found and timely solved, so that the total thickness of the paint film is accurately controlled, and the flatness of the surface of the paint film is ensured; 1% -1.5% of graphite powder filler is added into epoxy resin paint, graphene with the thickness of a single-layer carbon atom is uniformly dispersed in the paint and can be filled into micropores formed by curing the paint, and corrosive media are prevented from permeating; and finally, by refining the steps of the whole anticorrosion process, ash removal operation is carried out before each spraying, so that the influence of external dust mixed into the paint film on the quality of the paint film is reduced.
Description
Technical Field
The invention relates to the field of pipeline corrosion prevention, in particular to an inner spraying corrosion prevention process for a corrosion-prevention steel pipe.
Background
In the transportation of some corrosive chemicals, the pipeline transportation is the most economic and safe mode, but the common steel pipe cannot be directly used for transportation, and an anticorrosive coating needs to be correspondingly sprayed inside the pipeline to isolate the chemicals from the steel pipe so as to achieve safe transportation, but the existing pipeline internal anticorrosive treatment process is rough, the thickness of a paint film is not easy to control in single-layer spraying operation, so that the inner wall of the pipeline is not flat, and the transportation resistance is increased; meanwhile, a large number of micropores can be generated in the curing process of a pure epoxy resin paint film, so that the corrosion resistance of the coating is reduced; finally, the common anticorrosion treatment process in the pipeline is not tight, and impurities such as dust and the like are easily doped in the spraying operation, so that the quality of the coating is influenced.
Disclosure of Invention
The invention mainly aims to provide an inner spraying anticorrosion process for an anticorrosion steel pipe, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
an internal spraying anticorrosion process for an anticorrosion steel pipe comprises the following steps:
s1, preparing a steel pipe to be processed, removing impurities in the steel pipe and visible oil stain and grease on the surface of the steel pipe, and knocking the steel pipe by using a rubber hammer to remove residual dirt such as oxide skin and rusty spot;
s2, performing internal sand blasting, and performing sand blasting treatment on the inner surface of the steel pipe by using a dry sand blasting machine;
s3, internally purging, namely purging the inner wall of the steel pipe by using high-pressure compressed air to remove fine particles generated in the sand blasting process, and then slowly purging the inner wall of the steel pipe by using a portable electric dust remover to remove dust remained on the inner wall of the steel pipe during sand blasting operation and front-section purging;
s4, performing internal spraying (first spraying), and spraying a first primer on the inner wall of the steel pipe by using a mobile pipeline inner wall liquid coating centrifugal spraying machine;
s5, internally spraying (one surface), waiting for 24 hours after S4 is finished, and spraying finish paint on the inner wall of the steel pipe for the first time by using a mobile pipeline inner wall liquid paint centrifugal spraying machine;
s6, internal spraying (two-bottom), waiting for 8-12 hours after S5 is finished, and spraying the priming paint for the second time on the inner wall of the steel pipe by using a mobile pipeline inner wall liquid paint centrifugal spraying machine
S7, internal spraying (two surfaces), waiting for 24 hours after S6 is finished, and spraying finish paint on the inner wall of the steel pipe for the second time by using a mobile pipeline inner wall liquid paint centrifugal spraying machine;
s8, detecting, namely detecting the overall appearance and the thickness in time after the paint is sprayed for four times, and performing the next procedure after the paint is qualified;
and S9, packaging, sealing and packaging the two ends of the steel pipe after the paint is dried, and waiting for transferring.
Preferably, the dry blasting machine in the step S2 is a press-in dry blasting machine, working pressure is established in the pressure tank by compressed air, and the abrasive is pressed into the sand conveying pipe through the sand outlet valve and ejected through the nozzle to be sprayed onto the inner wall of the steel pipe, wherein the abrasive is a mixture of artificial abrasive silicon carbide and natural abrasive silicon carbide.
Preferably, in the step S3, the compressed air is sprayed out through a nozzle with a fan-shaped spray, the inner wall of the steel pipe is manually and repeatedly purged for multiple times, and the surface of the steel pipe is lightly knocked by a rubber hammer during purging, so that the abrasive attached to the inner wall of the steel pipe is blown away under vibration.
Preferably, the portable electric dust collector in the step S3 is a blowing and sucking dual-purpose type, and the air suction operation mode is selected in the internal blowing and sweeping step.
Preferably, in the steps S4, S5, S6 and S7, before each layer of paint is sprayed, a portable electric dust collector is used to completely absorb the fine impurities and dust in the pipe, then a controller matched with the spraying machine is used to control the spraying machine to automatically move forward in the pipe until the pipe end stops, the spraying head starts spraying outside the pipe, and after the spraying is normal, the trolley is started to move backward at a constant speed, so that the paint is uniformly sprayed on the pipe wall.
Preferably, the thickness of the single layer dry paint film in the steps S4, S5, S6 and S7 is 40-50 μm, and the thickness of the wet film is controlled and detected by a wet film thickness meter after the spraying is finished.
Preferably, the paints used in the steps S4, S5, S6 and S7 are mainly epoxy resins, to which 1% to 1.5% of graphite powder filler is additionally added.
Preferably, the steps S4, S5, S6 and S7 reserve an area of 8-10cm at both ends of the pipeline during the spraying operation without spraying.
Preferably, in the step S8, an electronic vernier caliper is used to detect whether the total thickness of the paint film is 160-200 μm, and whether the paint film is uniform and consistent, and whether phenomena such as sagging, missing coating, bottom exposure, and wrinkling exist is observed in a visual inspection manner.
Preferably, in step S9, the portable electric dust collector is used to remove dust from the interior of the pipe, the rubber cover is used to seal the two ends of the pipe, and finally a layer of film is wound on the outer surface to complete the packaging.
Compared with the prior art, the invention carries out spraying operation by designing a spraying mode of twice priming paint and twice finishing paint, controls and detects the thickness of each layer of wet film by using a wet film instrument, completes the single-layer paint film step by step, conveniently and timely finds out the problem of the paint film and solves the problem in time, thereby achieving the purposes of accurately controlling the total thickness of the paint film and ensuring the flatness of the surface of the paint film; 1% -1.5% of graphite powder filler is added into epoxy resin paint, graphene with the thickness of a single-layer carbon atom is uniformly dispersed in the paint and can be filled into micropores formed by curing the paint, and corrosive media are prevented from permeating; and finally, by refining the steps of the whole anticorrosion process, ash removal operation is carried out before each spraying, so that the influence of external dust mixed into the paint film on the quality of the paint film is reduced.
Drawings
FIG. 1 is a schematic view of a process flow of the anticorrosion technology for spraying inside an anticorrosion steel pipe.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The internal spraying anticorrosion process for the anticorrosion steel pipe as shown in figure 1 comprises the following steps:
s1, preparing a steel pipe to be processed, removing impurities in the steel pipe and visible oil stain and grease on the surface of the steel pipe, and knocking the steel pipe by using a rubber hammer to remove residual dirt such as oxide skin and rusty spot;
s2, performing internal sand blasting, and performing sand blasting treatment on the inner surface of the steel pipe by using a dry sand blasting machine;
s3, internally purging, namely purging the inner wall of the steel pipe by using high-pressure compressed air to remove fine particles generated in the sand blasting process, and then slowly purging the inner wall of the steel pipe by using a portable electric dust remover to remove dust remained on the inner wall of the steel pipe during sand blasting operation and front-section purging;
s4, performing internal spraying (first spraying), and spraying a first primer on the inner wall of the steel pipe by using a mobile pipeline inner wall liquid coating centrifugal spraying machine;
s5, internally spraying (one surface), waiting for 24 hours after S4 is finished, and spraying finish paint on the inner wall of the steel pipe for the first time by using a mobile pipeline inner wall liquid paint centrifugal spraying machine;
s6, internal spraying (two-bottom), waiting for 8-12 hours after S5 is finished, and spraying the priming paint for the second time on the inner wall of the steel pipe by using a mobile pipeline inner wall liquid paint centrifugal spraying machine
S7, internal spraying (two surfaces), waiting for 24 hours after S6 is finished, and spraying finish paint on the inner wall of the steel pipe for the second time by using a mobile pipeline inner wall liquid paint centrifugal spraying machine;
s8, detecting, namely detecting the overall appearance and the thickness in time after the paint is sprayed for four times, and performing the next procedure after the paint is qualified;
and S9, packaging, sealing and packaging the two ends of the steel pipe after the paint is dried, and waiting for transferring.
The dry sand blasting machine in the step S2 is a press-in dry sand blasting machine, working pressure is built in a pressure tank through compressed air, abrasive is pressed into a sand conveying pipe through a sand outlet valve and is ejected through a nozzle to be sprayed onto the inner wall of the steel pipe, and the abrasive is a mixture of artificial abrasive silicon carbide and natural abrasive silicon carbide; in the step S3, compressed air is sprayed out through a fan-shaped spraying nozzle, the inner wall of the steel pipe is manually and repeatedly swept for many times, and the surface of the steel pipe is lightly knocked by a rubber hammer in the sweeping process, so that the abrasive attached to the inner wall of the steel pipe is blown away under the vibration; the portable electric dust collector in the step S3 is of a blowing and sucking dual-purpose type, and an air sucking working mode is selected in the internal blowing step, so that the problem of poor cleaning effect caused by secondary dust raising can be effectively avoided, and the field operation environment can be improved; in the steps S4, S5, S6 and S7, before each layer of paint is sprayed, a portable electric dust collector is required to suck up fine sundries and dust in the pipe, then a controller matched with the spraying machine is used for controlling the spraying machine to automatically move forwards in the pipe until the pipe end stops, a spraying head starts spraying outside the pipe, a trolley is started to move backwards at a constant speed after normal atomization, the paint is uniformly sprayed on the pipe wall, and the optimal moving speed and spraying flow rate of the spraying machine are calculated in advance through tests; the thickness of the single-layer dry paint film in the steps S4, S5, S6 and S7 is 40-50 μm, and the thickness of the wet film is controlled and detected by a wet film meter after the spraying is finished; the paints used in steps S4, S5, S6 and S7 are mainly epoxy resins, to which 1-1.5% of graphite powder filler is additionally added; in the steps S4, S5, S6 and S7, 8-10cm areas are reserved at two ends of the pipeline in the spraying operation process, and spraying is not carried out, so that the pipeline can be conveniently connected in the later period; in the step S8, an electronic vernier caliper is used for detecting whether the total thickness of the paint film is 160-200 μm, and whether the paint film is uniform or not, and whether phenomena of sagging, missing coating, bottom exposure, wrinkling and the like exist or not is observed in a visual inspection mode; in step S9, the portable electric dust collector is used to remove the dust in the pipeline, the rubber cover is used to block the two ends of the pipeline, and finally a layer of film is wound on the outer surface to complete the package.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. An internal spraying anticorrosion process for an anticorrosion steel pipe is characterized in that: the method comprises the following steps:
s1, preparing a steel pipe to be processed, removing impurities in the steel pipe and visible oil stain and grease on the surface of the steel pipe, and knocking the steel pipe by using a rubber hammer to remove residual dirt such as oxide skin and rusty spot;
s2, performing internal sand blasting, and performing sand blasting treatment on the inner surface of the steel pipe by using a dry sand blasting machine;
s3, internally purging, namely purging the inner wall of the steel pipe by using high-pressure compressed air to remove fine particles generated in the sand blasting process, and then slowly purging the inner wall of the steel pipe by using a portable electric dust remover to remove dust remained on the inner wall of the steel pipe during sand blasting operation and front-section purging;
s4, performing internal spraying (first spraying), and spraying a first primer on the inner wall of the steel pipe by using a mobile pipeline inner wall liquid coating centrifugal spraying machine;
s5, internally spraying (one surface), waiting for 24 hours after S4 is finished, and spraying finish paint on the inner wall of the steel pipe for the first time by using a mobile pipeline inner wall liquid paint centrifugal spraying machine;
s6, internal spraying (two-bottom), waiting for 8-12 hours after S5 is finished, and spraying the priming paint for the second time on the inner wall of the steel pipe by using a mobile pipeline inner wall liquid paint centrifugal spraying machine
S7, internal spraying (two surfaces), waiting for 24 hours after S6 is finished, and spraying finish paint on the inner wall of the steel pipe for the second time by using a mobile pipeline inner wall liquid paint centrifugal spraying machine;
s8, detecting, namely detecting the overall appearance and the thickness in time after the paint is sprayed for four times, and performing the next procedure after the paint is qualified;
and S9, packaging, sealing and packaging the two ends of the steel pipe after the paint is dried, and waiting for transferring.
2. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 1, which is characterized in that: and the dry sand blasting machine in the step S2 is a press-in dry sand blasting machine, working pressure is built in a pressure tank through compressed air, abrasive is pressed into a sand conveying pipe through a sand outlet valve and is ejected through a nozzle to be sprayed onto the inner wall of the steel pipe, wherein the abrasive is a mixture of artificial abrasive silicon carbide and natural abrasive silicon carbide.
3. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 1, which is characterized in that: and in the step S3, compressed air is sprayed out through a fan-shaped spraying nozzle, the inner wall of the steel pipe is manually and repeatedly swept for many times, and the surface of the steel pipe is lightly knocked by a rubber hammer in the sweeping process, so that the abrasive attached to the inner wall of the steel pipe is blown away under the vibration.
4. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 1, which is characterized in that: the portable electric dust collector in the step S3 is of a blowing and sucking dual-purpose type, and an air sucking working mode is selected in the internal blowing and sweeping step.
5. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 1, which is characterized in that: in the steps S4, S5, S6 and S7, before each layer of paint is sprayed, a portable electric dust collector is used for completely absorbing fine impurities and dust in the pipe, then a controller matched with the spraying machine is used for controlling the spraying machine to automatically move forwards in the pipe until the pipe end stops, the spraying head starts spraying outside the pipe, and after the spraying is normal, the trolley is started to move backwards at a constant speed, so that the paint is uniformly sprayed on the pipe wall.
6. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 5, which is characterized in that: the thickness of the single-layer dry paint film in the steps S4, S5, S6 and S7 is 40-50 μm, and the thickness of the wet film is controlled and detected by a wet film meter after the spraying is finished.
7. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 5, which is characterized in that: the paints used in the steps S4, S5, S6 and S7 are mainly epoxy resins, to which 1-1.5% of graphite powder filler is additionally added.
8. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 1, which is characterized in that: the steps S4, S5, S6 and S7 reserve an area of 8-10cm at both ends of the pipeline during the spraying operation without spraying.
9. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 1, which is characterized in that: in the step S8, an electronic vernier caliper is used to detect whether the total thickness of the paint film is 160-200 μm, and whether the paint film is uniform and consistent, and whether phenomena such as sagging, missing coating, bottom exposure, wrinkling, etc. exist is observed by a visual inspection method.
10. The internal spraying anticorrosion process for anticorrosion steel pipes as claimed in claim 1, which is characterized in that: in the step S9, the portable electric dust collector is used to remove the dust in the pipeline, the rubber sealing cover is used to block the two ends of the pipeline, and finally a layer of film is wound on the outer surface to complete the packaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911194225.4A CN110815059A (en) | 2019-11-28 | 2019-11-28 | Internal spraying corrosion prevention process for corrosion-prevention steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911194225.4A CN110815059A (en) | 2019-11-28 | 2019-11-28 | Internal spraying corrosion prevention process for corrosion-prevention steel pipe |
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| Publication Number | Publication Date |
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| CN110815059A true CN110815059A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911194225.4A Pending CN110815059A (en) | 2019-11-28 | 2019-11-28 | Internal spraying corrosion prevention process for corrosion-prevention steel pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846656A (en) * | 2020-12-31 | 2021-05-28 | 无锡恒丰祥钢管科技有限公司 | Production process of round pipe and steel pipe with corrosion resistance |
| CN112934543A (en) * | 2021-01-27 | 2021-06-11 | 武船重型工程股份有限公司 | Spraying robot |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1370295A (en) * | 1971-09-10 | 1974-10-16 | Baldock H C | Mechanical working of metallic surfaces |
| CN1052879A (en) * | 1989-12-29 | 1991-07-10 | 天津化工厂 | Antiwear and anticorrosion coating |
| CN203532995U (en) * | 2013-08-30 | 2014-04-09 | 宜兴市华盛环保管道有限公司 | Composite anti-corrosion structure of buried pipe |
| CN109078824A (en) * | 2018-09-27 | 2018-12-25 | 中国电建市政建设集团有限公司 | It is a kind of using water paint to the construction method of wind-power tower coating |
-
2019
- 2019-11-28 CN CN201911194225.4A patent/CN110815059A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1370295A (en) * | 1971-09-10 | 1974-10-16 | Baldock H C | Mechanical working of metallic surfaces |
| CN1052879A (en) * | 1989-12-29 | 1991-07-10 | 天津化工厂 | Antiwear and anticorrosion coating |
| CN203532995U (en) * | 2013-08-30 | 2014-04-09 | 宜兴市华盛环保管道有限公司 | Composite anti-corrosion structure of buried pipe |
| CN109078824A (en) * | 2018-09-27 | 2018-12-25 | 中国电建市政建设集团有限公司 | It is a kind of using water paint to the construction method of wind-power tower coating |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112846656A (en) * | 2020-12-31 | 2021-05-28 | 无锡恒丰祥钢管科技有限公司 | Production process of round pipe and steel pipe with corrosion resistance |
| CN112934543A (en) * | 2021-01-27 | 2021-06-11 | 武船重型工程股份有限公司 | Spraying robot |
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Application publication date: 20200221 |