CN113477493A - Method for performing anticorrosive treatment on inner surface of spiral welded pipe by adopting preheating method - Google Patents
Method for performing anticorrosive treatment on inner surface of spiral welded pipe by adopting preheating method Download PDFInfo
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- CN113477493A CN113477493A CN202110724810.1A CN202110724810A CN113477493A CN 113477493 A CN113477493 A CN 113477493A CN 202110724810 A CN202110724810 A CN 202110724810A CN 113477493 A CN113477493 A CN 113477493A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000003973 paint Substances 0.000 claims abstract description 85
- 238000005507 spraying Methods 0.000 claims abstract description 74
- 238000003756 stirring Methods 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 239000003822 epoxy resin Substances 0.000 claims abstract description 16
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 39
- 238000001514 detection method Methods 0.000 claims description 36
- 239000011247 coating layer Substances 0.000 claims description 24
- 230000007547 defect Effects 0.000 claims description 24
- 239000000428 dust Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 24
- 238000007789 sealing Methods 0.000 claims description 24
- 238000005422 blasting Methods 0.000 claims description 17
- 238000002791 soaking Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000005488 sandblasting Methods 0.000 claims description 12
- 238000004381 surface treatment Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 150000008065 acid anhydrides Chemical class 0.000 claims description 3
- 229920003180 amino resin Polymers 0.000 claims description 3
- 125000003118 aryl group Chemical group 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 229920000768 polyamine Polymers 0.000 claims description 3
- 229920003987 resole Polymers 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000005536 corrosion prevention Methods 0.000 claims 8
- 230000000694 effects Effects 0.000 abstract description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
- B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
- B05D7/225—Coating inside the pipe
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a method for performing anticorrosive treatment on the inner surface of a spiral welded pipe by adopting a preheating method, which comprises the following steps: preparing an anticorrosive paint: firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished; (II) treating the inner surface of the spiral welded pipe: A. firstly, the inner surface of the spiral welded pipe is detected. By adopting the treatment method, the inner surface of the spiral welded pipe is treated before the anticorrosive paint is sprayed, so that the anticorrosive paint can be well fixed with the inner surface of the spiral welded pipe, the anticorrosive effect is ensured, and the spiral welded pipe is preheated after the anticorrosive paint is sprayed, so that the anticorrosive paint can be timely connected with the inner surface of the spiral welded pipe, the dripping phenomenon can not occur, the spraying uniformity is better ensured, and the anticorrosive effect is better ensured.
Description
Technical Field
The invention relates to the technical field of spiral welded pipes, in particular to a method for performing anticorrosive treatment on the inner surface of a spiral welded pipe by adopting a preheating method.
Background
The spiral welded pipe is made up by rolling the steel band of low-carbon or low-alloy structural steel into pipe blank according to a certain spiral angle (called forming angle), then seam-welding the pipe blank, and can use narrower band steel to produce large-diameter steel pipe, its specification is expressed by external diameter and wall thickness, and the welded pipe must ensure that the hydraulic test, tensile strength of welded seam and cold bending property are in accordance with the regulation.
Disclosure of Invention
The invention aims to provide a method for performing anti-corrosion treatment on the inner surface of a spiral welded pipe by adopting a preheating method, which is used for solving the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for performing anticorrosion treatment on the inner surface of a spiral welded pipe by adopting a preheating method comprises the following steps:
preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Preferably, the curing agent in the first step is any one or a mixture of several of aromatic polyamine, acid anhydride, resol, amino resin, dicyandiamide and hydrazide.
Preferably, the preheating temperature of the epoxy resin paint in the first step is 40-60 ℃ and the preheating temperature of the curing agent is 30-40 ℃.
Preferably, in the first step, the stirring speed is kept at 1000-1500r/min, and the stirring time is 8-10 min.
Preferably, in the step a of the second step, when the inner surface of the spiral welded pipe is detected, floating ash on the surface and the inner surface of the spiral welded pipe needs to be removed first.
Preferably, in the step B of the second step, the rust treatment is accelerated by ultrasonic vibration during soaking.
Preferably, in the step C of the second step, the shot is a steel shot when shot blasting is performed.
Preferably, the wet film thickness of the anticorrosive coating in the third step is 400-600 μm, and the temperature is kept at 50-60 ℃ during preheating.
Preferably, the temperature of the third step is kept between 80 and 120 ℃ when the curing is carried out, and the time is kept between 1 and 2 hours.
Compared with the prior art, the invention has the following beneficial effects:
by adopting the treatment method designed by the invention, the inner surface of the spiral welded pipe is treated before the anticorrosive paint is sprayed, so that the anticorrosive paint can be well fixed with the inner surface of the spiral welded pipe, the anticorrosive effect is ensured, and the spiral welded pipe is preheated after the anticorrosive paint is sprayed, so that the anticorrosive paint can be timely connected with the inner surface of the spiral welded pipe, the dripping phenomenon can not occur, the spraying uniformity is better ensured, and the anticorrosive effect is better ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that:
a method for performing anticorrosion treatment on the inner surface of a spiral welded pipe by adopting a preheating method comprises the following steps:
preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
The first embodiment is as follows:
preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Example two:
in the first embodiment, the following steps are added:
the curing agent in the first step is any one or a mixture of more of aromatic polyamine, acid anhydride, resol, amino resin, dicyandiamide and hydrazide.
Preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Example three:
in the second embodiment, the following steps are added:
step one, the preheating temperature of the epoxy resin paint is 40-60 ℃ and the preheating temperature of the curing agent is 30-40 ℃ during preheating.
Preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Example four:
in the third embodiment, the following steps are added:
step one, when mixing is carried out, the stirring speed is kept at 1000-1500r/min, and the stirring time is 8-10 min.
Preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Example five:
in the fourth example, the following steps were added:
when the inner surface of the spiral welded pipe is detected in the step A in the step B, floating ash on the surface and the inner surface of the spiral welded pipe needs to be removed.
Preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Example six:
in the fifth example, the following steps were added:
and step B, accelerating the rust treatment by ultrasonic vibration during soaking.
Preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Example seven:
in example six, the following steps were added:
and C, shot blasting is performed when shot blasting is performed in the step C.
Preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Example eight:
in example seven, the following steps were added:
step three, the wet film thickness of the anticorrosive coating is 400-600 mu m, and the temperature is kept between 50 and 60 ℃ during preheating.
Preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Example nine:
in example eight, the following steps were added:
and step three, the temperature is kept between 80 and 120 ℃ during curing, and the time is kept between 1 and 2 hours.
Preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for performing anticorrosive treatment on the inner surface of a spiral welded pipe by adopting a preheating method is characterized by comprising the following steps: the method comprises the following steps:
preparing an anticorrosive paint:
firstly, epoxy resin paint and a curing agent are mixed according to the following ratio of (5-7): (3-5) adding the mixture into a heating furnace according to the proportion for preheating, stirring and mixing the mixture by a stirrer, and preserving heat for later use after stirring is finished;
(II) treating the inner surface of the spiral welded pipe:
A. firstly, carrying out defect detection on the inner surface of the spiral welded pipe, and then carrying out ultrasonic defect detection, and leaving qualified products for later use;
B. then soaking the spiral welded pipe obtained in the step into a rust remover for rust removal, and taking out and drying the spiral welded pipe after the rust removal is finished;
C. performing shot blasting treatment on the inner surface of the spiral welded pipe obtained in the step, performing sand blasting treatment, and adsorbing dust and dregs generated in the inner surface treatment through a dust collector;
(III) spraying anticorrosive paint:
conveying the spiral welded pipe prepared in the step into a spraying production line, uniformly spraying anticorrosive paint on the inner surface of the spiral welded pipe by using a spraying machine, preheating the spiral welded pipe after spraying the anticorrosive paint, preliminarily solidifying the anticorrosive paint on the inner surface of the spiral welded pipe, taking down the prepared spiral welded pipe after spraying and preheating, and conveying the spiral welded pipe into a curing furnace for curing;
and (IV) detection:
and (3) detecting the cured spiral welded pipe, sealing one end of the spiral welded pipe, pouring corrosive liquid, sealing the other end of the spiral welded pipe, standing for 48 hours, pouring the corrosive liquid, and observing whether the anticorrosive coating layer on the inner surface of the spiral welded pipe has the peeling phenomenon or not, wherein if the anticorrosive coating layer is not peeled, the spiral welded pipe is qualified.
2. The method for corrosion prevention treatment of the inner surface of the spiral welded pipe by the preheating method according to claim 1, wherein: the curing agent in the first step is any one or a mixture of more of aromatic polyamine, acid anhydride, resol, amino resin, dicyandiamide and hydrazide.
3. The method for corrosion prevention treatment of the inner surface of the spiral welded pipe by the preheating method according to claim 1, wherein: in the first step, the preheating temperature of the epoxy resin paint is 40-60 ℃ and the preheating temperature of the curing agent is 30-40 ℃.
4. The method for corrosion prevention treatment of the inner surface of the spiral welded pipe by the preheating method according to claim 1, wherein: in the first step, the stirring speed is kept at 1500r/min for 8-10min when mixing is carried out.
5. The method for corrosion prevention treatment of the inner surface of the spiral welded pipe by the preheating method according to claim 1, wherein: when the inner surface of the spiral welded pipe is detected in the step A of the step II, floating ash on the surface and the inner surface of the spiral welded pipe needs to be removed firstly.
6. The method for corrosion prevention treatment of the inner surface of the spiral welded pipe by the preheating method according to claim 1, wherein: and B, accelerating the rust treatment by ultrasonic vibration during soaking.
7. The method for corrosion prevention treatment of the inner surface of the spiral welded pipe by the preheating method according to claim 1, wherein: and C, in the second step, shot blasting is performed when shot blasting is performed, wherein the shot is a steel shot.
8. The method for corrosion prevention treatment of the inner surface of the spiral welded pipe by the preheating method according to claim 1, wherein: the third step is that the wet film thickness of the anticorrosive coating is 400-600 mu m, and the temperature is kept between 50 and 60 ℃ during preheating.
9. The method for corrosion prevention treatment of the inner surface of the spiral welded pipe by the preheating method according to claim 1, wherein: and in the third step, the temperature is kept between 80 and 120 ℃ during curing, and the time is kept between 1 and 2 hours.
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| JP2000084463A (en) * | 1998-09-09 | 2000-03-28 | Nippon Paint Co Ltd | Method for forming coating film excellent in appearance |
| CN108864791A (en) * | 2018-07-03 | 2018-11-23 | 宝鸡石油输送管有限公司 | A kind of steel heat distribution pipeline inner wall high-temperature resistant anti-corrosive coating and construction technology |
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| JP2000084463A (en) * | 1998-09-09 | 2000-03-28 | Nippon Paint Co Ltd | Method for forming coating film excellent in appearance |
| CN108864791A (en) * | 2018-07-03 | 2018-11-23 | 宝鸡石油输送管有限公司 | A kind of steel heat distribution pipeline inner wall high-temperature resistant anti-corrosive coating and construction technology |
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Application publication date: 20211008 |