CN113600462A - Anticorrosion treatment process for composite steel pipe - Google Patents
Anticorrosion treatment process for composite steel pipe Download PDFInfo
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- CN113600462A CN113600462A CN202110905436.5A CN202110905436A CN113600462A CN 113600462 A CN113600462 A CN 113600462A CN 202110905436 A CN202110905436 A CN 202110905436A CN 113600462 A CN113600462 A CN 113600462A
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- 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
- B05D7/14—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 metal, e.g. car bodies
- B05D7/146—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 metal, e.g. car bodies to metallic pipes or tubes
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- 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
- B05D7/14—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 metal, e.g. car bodies
- B05D7/148—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 metal, e.g. car bodies using epoxy-polyolefin systems in mono- or multilayers
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- 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
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- 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
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/588—No curing step for the last layer
- B05D7/5883—No curing step for any layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/12—Orthophosphates containing zinc cations
- C23C22/13—Orthophosphates containing zinc cations containing also nitrate or nitrite anions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/088—Iron or steel solutions containing organic acids
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
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- 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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- 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
- B05D2507/00—Polyolefins
- B05D2507/01—Polyethylene
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- 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
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
Abstract
The invention discloses an anticorrosive treatment process of a composite steel pipe, and relates to the technical field of steel pipe surface treatment. The technical key points comprise that: performing primary powder electrostatic spraying on the outer surface of the composite steel pipe to form a powder coating A, performing secondary powder electrostatic spraying on the surface of the powder coating A to form a powder coating B, and finally performing polyethylene spray coating to obtain the composite steel pipe; the powder coating B and the powder coating A both comprise epoxy resin and nano ceramic powder, and the powder coating B further comprises an adhesive. The composite steel pipe treated by the anticorrosion treatment process has the advantages of good anticorrosion performance, large coating adhesion, difficult shedding and easy repair.
Description
Technical Field
The invention relates to the technical field of steel pipe surface treatment, in particular to an anti-corrosion treatment process of a composite steel pipe.
Background
Composite steel pipes are now used in the industries of electricity, coal, urban and rural construction, ships, petrochemical, machinery, nuclear industry, and the like. The surface of the composite steel pipe material and the environment generate chemical/electrochemical reaction to reduce the performance of the material, thereby shortening the service life of the composite steel pipe.
At present, the most important anticorrosion means is to treat the metal surface to passivate the metal surface or isolate the external environment to achieve the purpose of anticorrosion. The phosphating treatment is a common and practical method, and a compact phosphate coating can be formed on the surface of the metal material after the phosphating treatment, so that the corrosion resistance of the metal material and the subsequent adhesive force and binding force between the metal material and an outer organic coating can be effectively improved. The traditional phosphating process comprises the following steps: degreasing, washing, derusting, washing, surface adjustment, phosphating, washing and drying, the process is complicated, and the film forming principle of the phosphating film determines that the conventional phosphating treatment process has troublesome treatment process and the phosphate film is generated at a slow speed or even can not form the film.
For example, chinese patent CN201610397553.4 discloses a formulation of a normal temperature phosphating solution for carbon steel tubes, which is added with a large amount of toxic sodium nitrite phosphating stabilizer, which does not meet the environmental protection requirements and greatly limits the application field thereof.
For example, chinese patent CN104449249A discloses an epoxy resin coating in a 3PE anticorrosive coating of a submarine steel pipe and a preparation method thereof, wherein the epoxy resin anticorrosive coating comprises the following components in percentage by mass: 55 to 65 percent of epoxy resin; 23.5 to 36 percent of color filler; 10.4 to 15.3 percent of auxiliary agent. According to the invention, the talcum powder, the mica powder, the bentonite and the titanium dioxide are properly added into the epoxy resin as partial fillers, so that the dosage of the resin can be relatively reduced, the cost is reduced, and simultaneously, the physical and mechanical properties, such as the elastic modulus, the curing shrinkage rate, the seawater impact resistance and the seawater resistance, can be improved. Although the epoxy resin coating does not introduce substances with high toxicity, the epoxy resin coating has the problems of poor coating adhesion and easy coating falling off due to excessive pigment and filler.
Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide an anticorrosion treatment process for a composite steel pipe, which has the advantages of good anticorrosion performance, large coating adhesion, difficult shedding and easy repair.
In order to achieve the purpose, the invention provides the following technical scheme:
an anti-corrosion treatment process of a composite steel pipe comprises the following steps:
step one, performing shot blasting, acid pickling and phosphating on the composite steel pipe to obtain a pretreated composite steel pipe;
heating the pretreated composite steel pipe to 175-190 ℃, and performing primary powder electrostatic spraying on the outer surface of the composite steel pipe to obtain a powder coating A; the powder coating A comprises the following components in parts by weight: 30-50 parts of epoxy resin, 50-70 parts of nano ceramic powder and 3-6 parts of an auxiliary agent A;
step three, heating the composite steel pipe in the step two to 190-200 ℃, and performing secondary powder electrostatic spraying on the surface of the powder coating A to obtain a powder coating B; the powder coating B comprises the following components in parts by weight: 55-70 parts of epoxy resin, 25-40 parts of nano ceramic powder, 10-20 parts of adhesive and 3-6 parts of auxiliary agent B;
and step four, heating the composite steel pipe in the step three to 195-205 ℃, performing polyethylene spraying on the inner wall and the outer surface of the composite steel pipe, leveling the coating, and cooling to form a polyethylene layer, thus obtaining the composite steel pipe after the anticorrosion treatment.
The anticorrosion treatment process forms the anticorrosion layer by spraying the powder coating A, the powder coating B and the polyethylene layer on the composite steel pipe, and is different from the conventional three-layer polyethylene anticorrosion layer (3 PE for short) in that the powder coating B replaces an adhesive layer, and the powder coating B are only bonded into a whole by adding an adhesive, so that the overall stability is improved, and the anticorrosion layer can be prevented from falling off.
The base material in the powder coating A is epoxy resin, the nano ceramic powder is added into the base material as a filler, and the nano ceramic powder is added in a large amount, so that the nano ceramic powder needs to be subjected to phosphating treatment in the early stage, and can be tightly attached to the surface of the composite steel pipe. In addition, the proportion of the nano ceramic powder can also obviously improve the mechanical strength of the powder coating A and the compactness of the powder coating A, so that the composite steel pipe has better corrosion resistance.
The base material in the powder coating B is epoxy resin, the nano ceramic powder is still added into the base material as a filler, and the powder coating A and the powder coating B are easily combined into a whole and have better bonding performance because the compositions of the powder coating A and the powder coating B are similar. In addition, because the adhesive is added into the powder coating B, the powder coating B and the powder coating B are only bonded into a whole, the overall stability is improved, and the anti-corrosion layer can be prevented from falling off.
Because the outmost polyethylene layer that is of anticorrosive coating, if the anticorrosive coating micro scratch appears, can directly restore, it is more convenient to operate.
Further preferably, in the step one, the pickling is performed by using a pickling solution, wherein the pickling solution comprises the following components in parts by weight: 6-12 parts of sulfuric acid, 5-10 parts of hydrochloric acid, 1-2 parts of hydroxyethylidene diphosphonic acid and 80-95 parts of water.
By adopting the technical scheme, substances such as an oxide layer, dust and the like on the composite steel pipe can be washed off by acid washing, and a protective coating can be formed on the surface in the later period.
Further preferably, in the first step, the phosphating is performed by using a phosphating solution, and the phosphating solution comprises the following components in parts by weight: 5-10 parts of zinc nitrate, 4-10 parts of phosphoric acid, 1-4 parts of ammonium dihydrogen phosphate, 0.5-1 part of fatty acid polyglycol ester and 75-85 parts of water.
By adopting the technical scheme, the phosphating treatment enables the surface of the composite steel pipe to form a phosphating film, so that the corrosion of the composite steel pipe can be prevented, and the adhesive force of the powder coating A can be improved, and the powder coating A can be tightly attached to the surface of the composite steel pipe.
Further preferably, the assistant A comprises the following components in parts by weight: 2-4 parts of a dispersing agent, 2-4 parts of a curing agent and 0.5-1 part of a defoaming agent;
the auxiliary agent B comprises the following components in parts by weight: 2-4 parts of a dispersing agent, 2-4 parts of a curing agent, 0.5-1 part of a defoaming agent and 1-2 parts of a coupling agent.
By adopting the technical scheme, the dispersing agent is added into the auxiliary agent A, so that the epoxy resin and the nano ceramic powder are uniformly dispersed, and a compact and uniform film layer can be formed on the powder coating A; the defoaming agent reduces bubbles and also enables the powder coating A to form a compact and uniform film layer.
By adopting the technical scheme, the coupling agent is added into the auxiliary agent B, so that the interface performance of the powder coating A and the powder coating B can be improved, the overall stability is improved, and the anti-corrosion layer can be prevented from falling off.
Further preferably, the heating temperature in the second step is 180-185 ℃, and the powder coating A comprises the following components in parts by weight: 40-45 parts of epoxy resin, 60-70 parts of nano ceramic powder and 3-6 parts of an auxiliary agent A;
the heating temperature in the third step is 190-195 ℃, and the powder coating B comprises the following components in parts by weight: 60-70 parts of epoxy resin, 30-35 parts of nano ceramic powder, 15-20 parts of adhesive and 3-6 parts of auxiliary agent B;
and in the fourth step, the preheating temperature is 200-205 ℃.
Through adopting above-mentioned technical scheme for spraying powder coating A, powder coating B and polyethylene layer three only bond as an organic wholely, improve holistic stability, also can avoid the anticorrosive coating to drop.
More preferably, the heating temperature in the second step is 185 ℃, and the powder coating A comprises the following components in parts by weight: 40 parts of epoxy resin, 60 parts of nano ceramic powder and 5 parts of an auxiliary agent A;
the heating temperature in the third step is 195 ℃, and the powder coating B comprises the following components in parts by weight: 65 parts of epoxy resin, 35 parts of nano ceramic powder, 20 parts of adhesive and 5 parts of auxiliary agent B;
the preheating temperature in the fourth step is 200 ℃.
Through adopting above-mentioned technical scheme for spraying powder coating A, powder coating B and polyethylene layer three only bond as an organic wholely, improve holistic stability, also can avoid the anticorrosive coating to drop.
More preferably, the thickness of the powder coating A is 200-400 μm, the thickness of the powder coating B is 400-700 μm, and the thickness of the polyethylene layer is 500-2000 μm.
More preferably, the thickness of the powder coating A is 300-350 μm, the thickness of the powder coating B is 600-650 μm, and the thickness of the polyethylene layer is 1000-1500 μm.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the powder coating A, the powder coating B and the polyethylene layer are sprayed on the composite steel pipe to form the anticorrosive coating, the anticorrosive coating is different from a conventional three-layer polyethylene anticorrosive coating (3 PE for short) in that the powder coating B replaces an adhesive layer, the powder coating B and the polyethylene layer are only bonded into a whole by adding an adhesive, the overall stability is improved, and the anticorrosive coating can be prevented from falling off.
(2) The base material in the powder coating A is epoxy resin, the nano ceramic powder is added into the base material as a filler, and the nano ceramic powder is added in a large amount, so that the nano ceramic powder needs to be subjected to phosphating treatment in the early stage, and can be tightly attached to the surface of the composite steel pipe. In addition, the proportion of the nano ceramic powder can also obviously improve the mechanical strength of the powder coating A and the compactness of the powder coating A, so that the composite steel pipe has better corrosion resistance.
(3) The base material in the powder coating B is epoxy resin, the nano ceramic powder is still added into the base material as a filler, and the powder coating A and the powder coating B are easily combined into a whole due to the similar composition of the powder coating A and the powder coating B, so that the powder coating A and the powder coating B are better in bonding performance. In addition, because the adhesive is added into the powder coating B, the powder coating B and the powder coating B are only bonded into a whole, the overall stability is improved, and the anti-corrosion layer can be prevented from falling off.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1: an anti-corrosion treatment process of a composite steel pipe comprises the following steps:
the method comprises the following steps of firstly, preheating a steel pipe to 30 ℃ through a flame preheating furnace, and removing combustible pollutants on the surface of the steel pipe by adopting flame combustion to obtain a preheated composite steel pipe;
derusting the surface of the preheated composite steel pipe by using a shot blasting derusting machine, and sweeping and recovering steel grit and steel shots on the inner wall of the composite steel pipe by using an in-pipe cleaning device to obtain the composite steel pipe subjected to shot blasting;
thirdly, heating the surface of the swept composite steel pipe through a heating furnace (the heating temperature is 55 ℃), and immersing the composite steel pipe into pickling solution for pickling (the temperature is 55 ℃), so as to obtain the pickled composite steel pipe; wherein the pickling solution comprises the following components in parts by weight: 10 parts of sulfuric acid, 5 parts of hydrochloric acid, 2 parts of hydroxyethylidene diphosphonic acid and 83 parts of water;
step four, immersing the pickled composite steel pipe into phosphating solution for phosphating (at the temperature of 55 ℃), and forming a layer of phosphating film on the surface of the composite steel pipe through phosphating, so as to enhance the adhesive force of the epoxy powder electrostatic spraying coating and obtain a pretreated composite steel pipe; the phosphating solution comprises the following components in parts by weight: 8 parts of zinc nitrate, 6 parts of phosphoric acid, 3 parts of ammonium dihydrogen phosphate, 1 part of fatty acid polyethylene glycol ester and 82 parts of water;
fifthly, heating the pretreated composite steel pipe to 175 ℃, and performing primary powder electrostatic spraying on the outer surface of the composite steel pipe to obtain a powder coating A with the thickness of 200 mu m; the powder coating A comprises the following components in parts by weight: 30 parts of epoxy resin, 50 parts of nano ceramic powder and 3 parts of an auxiliary agent A; the auxiliary agent A comprises the following components in parts by weight: 2 parts of a dispersant (KN-F110), 2 parts of a curing agent (PL400), 0.6 parts of a defoaming agent (byk 530);
step six, heating the composite steel pipe in the step five to 190 ℃, and performing secondary powder electrostatic spraying on the surface of the powder coating A to obtain a powder coating B with the thickness of 500 mu m; the powder coating B comprises the following components in parts by weight: 55 parts of epoxy resin, 25 parts of nano ceramic powder, 10 parts of adhesive (Shenzhen Tianzhong plastic Co., Ltd., model SPB9992) and 4 parts of auxiliary agent B; the auxiliary agent B comprises the following components in parts by weight: 3 parts of a dispersant (PL400), 3 parts of a curing agent (KH560), 0.8 part of a defoaming agent (byk530), 1.5 parts of a coupling agent (coupling agent KH 550);
and step seven, heating the composite steel pipe in the step three to 195 ℃, performing polyethylene spraying on the inner wall and the outer surface of the composite steel pipe, leveling the coating, and cooling with water to form a polyethylene layer with the thickness of 500 microns, thus obtaining the composite steel pipe after the anticorrosion treatment.
Examples 2 to 6: the difference between the anticorrosion treatment process of the composite steel pipe and the embodiment 1 is that the components and the corresponding parts by weight are shown in Table 1.
TABLE 1 Components and parts by weight of examples 1-6
Example 7: the difference between the anticorrosion treatment process of the composite steel pipe and the embodiment 6 is that the heating temperature in the fifth step is 180 ℃; the heating temperature in the sixth step is 190 ℃; the preheating temperature in the seventh step is 200 ℃.
Example 8: the difference between the anticorrosion treatment process for the composite steel pipe and the embodiment 6 is that the heating temperature in the fifth step is 185 ℃; the heating temperature in the sixth step is 195 ℃; the preheating temperature in the seventh step is 205 ℃.
Example 9: the difference between the anticorrosion treatment process for the composite steel pipe and the embodiment 6 is that the heating temperature in the fifth step is 185 ℃; the heating temperature in the sixth step is 195 ℃; the preheating temperature in the seventh step is 200 ℃.
Example 10: the difference between the anticorrosion treatment process of the composite steel pipe and the anticorrosion treatment process of the composite steel pipe in example 9 is that the thickness of the powder coating A is 300 microns, the thickness of the powder coating B is 600 microns, and the thickness of the polyethylene layer is 1100 microns.
Example 11: the difference between the anticorrosion treatment process of the composite steel pipe and the anticorrosion treatment process of the composite steel pipe in example 9 is that the thickness of the powder coating A is 350 micrometers, the thickness of the powder coating B is 650 micrometers, and the thickness of the polyethylene layer is 1200 micrometers.
Example 12: the difference between the anticorrosion treatment process of the composite steel pipe and the anticorrosion treatment process of the composite steel pipe in example 9 is that the thickness of the powder coating A is 300 microns, the thickness of the powder coating B is 650 microns, and the thickness of the polyethylene layer is 1150 microns.
Comparative example 1: the difference between the anticorrosion treatment process of the composite steel pipe and the embodiment 12 is that the nano-ceramic powder is replaced by nano-montmorillonite.
Comparative example 2: the anticorrosion treatment process of the composite steel pipe is different from the anticorrosion treatment process of the embodiment 12 in that the powder coating B is not arranged, and the adhesive is directly adopted as the only component.
Comparative example 3: the difference between the anticorrosion treatment process for the composite steel pipe and the embodiment 12 is that the heating temperature in the fifth step is 160 ℃.
The adhesion test was performed on the composite steel pipes subjected to the anticorrosive treatment in examples 1 to 12 and comparative examples 1 to 3, and the test results are shown in table 2:
table 2 adhesion test
As can be seen from the data in Table 2, the adhesion of the anticorrosive layers (powder coating A, powder coating B and polyethylene layer) of examples 1-12 all meet the standard and are much higher than the standard value. In addition, the montmorillonite added in the comparative example 1 has a test value above the standard value, but is also obviously reduced compared with the example. Comparative example 2 and comparative example 3 are the same.
The composite steel pipes after the anticorrosive treatment in examples 1 to 12 and comparative examples 1 to 3 were subjected to a bending resistance test (1.5 °, 25 ℃), and the test results are shown in table 3:
TABLE 3 bending resistance test
As can be seen from the data in Table 3, the anti-corrosive layers (powder coating A, powder coating B and polyethylene layer) of examples 1 to 12 all met the standard for bending resistance. In addition, montmorillonite is added in the comparative example 1, so that a uniform and compact coating cannot be formed on the surface of the composite steel pipe, and cracks appear in the bending resistance test.
The corrosion-treated composite steel pipes of examples 1 to 12 and comparative examples 1 to 3 were subjected to an acid resistance test (10 wt% sulfuric acid, 25 ℃, 720 hours) and the test results are shown in table 4:
table 4 acid resistance test
The composite steel pipes after the corrosion prevention treatment in examples 1 to 12 and comparative examples 1 to 3 were subjected to an alkali resistance test (5 wt% sodium hydroxide, 25 ℃, 720 hours), and the test results are shown in table 5:
TABLE 5 alkali resistance test
As can be seen from the data in tables 4 and 5, the anticorrosive layers (powder coating A, powder coating B and polyethylene layer) of examples 1 to 12 are excellent in acid and alkali resistance. Therefore, the composite steel pipe subjected to the anticorrosion treatment has the advantages of good anticorrosion performance, large coating adhesion, difficulty in falling and easiness in repair.
The anticorrosion treatment process forms the anticorrosion layer by spraying the powder coating A, the powder coating B and the polyethylene layer on the composite steel pipe, and is different from the conventional three-layer polyethylene anticorrosion layer (3 PE for short) in that the powder coating B replaces an adhesive layer, and the powder coating B are only bonded into a whole by adding an adhesive, so that the integral stability is improved, and the anticorrosion layer can be prevented from falling off.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The anti-corrosion treatment process of the composite steel pipe is characterized by comprising the following steps of:
step one, performing shot blasting, acid pickling and phosphating on the composite steel pipe to obtain a pretreated composite steel pipe;
heating the pretreated composite steel pipe to 175-190 ℃, and performing primary powder electrostatic spraying on the outer surface of the composite steel pipe to obtain a powder coating A; the powder coating A comprises the following components in parts by weight: 30-50 parts of epoxy resin, 50-70 parts of nano ceramic powder and 3-6 parts of an auxiliary agent A;
step three, heating the composite steel pipe in the step two to 190-200 ℃, and performing secondary powder electrostatic spraying on the surface of the powder coating A to obtain a powder coating B; the powder coating B comprises the following components in parts by weight: 55-70 parts of epoxy resin, 25-40 parts of nano ceramic powder, 10-20 parts of adhesive and 3-6 parts of auxiliary agent B;
and step four, heating the composite steel pipe in the step three to 195-205 ℃, performing polyethylene spraying on the inner wall and the outer surface of the composite steel pipe, leveling the coating, and cooling to form a polyethylene layer, thus obtaining the composite steel pipe after the anticorrosion treatment.
2. The corrosion prevention treatment process of the composite steel pipe as claimed in claim 1, wherein the pickling in the step one is carried out by using a pickling solution, and the pickling solution comprises the following components in parts by weight: 6-12 parts of sulfuric acid, 5-10 parts of hydrochloric acid, 1-2 parts of hydroxyethylidene diphosphonic acid and 80-95 parts of water.
3. The anticorrosion treatment process of a composite steel pipe as claimed in claim 1, wherein the phosphating in the first step adopts phosphating solution for treatment, and the phosphating solution comprises the following components in parts by weight: 5-10 parts of zinc nitrate, 4-10 parts of phosphoric acid, 1-4 parts of ammonium dihydrogen phosphate, 0.5-1 part of fatty acid polyglycol ester and 75-85 parts of water.
4. The anticorrosion treatment process of a composite steel pipe as claimed in claim 1, wherein the additive A comprises the following components in parts by weight: 2-4 parts of a dispersing agent, 2-4 parts of a curing agent and 0.5-1 part of a defoaming agent;
the auxiliary agent B comprises the following components in parts by weight: 2-4 parts of a dispersing agent, 2-4 parts of a curing agent, 0.5-1 part of a defoaming agent and 1-2 parts of a coupling agent.
5. The anticorrosion treatment process for the composite steel pipe as claimed in any one of claims 1 to 4, wherein the heating temperature in the second step is 180 to 185 ℃, and the powder coating A comprises the following components in parts by weight: 40-45 parts of epoxy resin, 60-70 parts of nano ceramic powder and 3-6 parts of an auxiliary agent A;
the heating temperature in the third step is 190-195 ℃, and the powder coating B comprises the following components in parts by weight: 60-70 parts of epoxy resin, 30-35 parts of nano ceramic powder, 15-20 parts of adhesive and 3-6 parts of auxiliary agent B;
and in the fourth step, the preheating temperature is 200-205 ℃.
6. The anticorrosion treatment process for the composite steel pipe as claimed in claim 5, wherein the heating temperature in the second step is 185 ℃, and the powder coating A comprises the following components in parts by weight: 40 parts of epoxy resin, 60 parts of nano ceramic powder and 5 parts of an auxiliary agent A;
the heating temperature in the third step is 195 ℃, and the powder coating B comprises the following components in parts by weight: 65 parts of epoxy resin, 35 parts of nano ceramic powder, 20 parts of adhesive and 5 parts of auxiliary agent B;
the preheating temperature in the fourth step is 200 ℃.
7. The anticorrosion treatment process for a composite steel pipe as claimed in any one of claims 1 to 4, wherein the thickness of said powder coating layer A is 200 to 400 μm, the thickness of said powder coating layer B is 400 to 700 μm, and the thickness of said polyethylene layer is 500 to 2000 μm.
8. The anticorrosion treatment process for a composite steel pipe as claimed in claim 7, wherein the thickness of the powder coating A is 300-350 μm, the thickness of the powder coating B is 600-650 μm, and the thickness of the polyethylene layer is 1000-1500 μm.
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| CN201386866Y (en) * | 2009-03-27 | 2010-01-20 | 潍坊亿斯特管业科技有限公司 | Composite steel pipe with outer polyethylene layer and inner epoxy resin layer |
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| CN201386866Y (en) * | 2009-03-27 | 2010-01-20 | 潍坊亿斯特管业科技有限公司 | Composite steel pipe with outer polyethylene layer and inner epoxy resin layer |
| CN102559120A (en) * | 2011-12-30 | 2012-07-11 | 浙江天和树脂有限公司 | Temperature-resistant, corrosion-resistant and high-adhesion adhesive and preparation method thereof |
| CN103243340A (en) * | 2013-05-08 | 2013-08-14 | 张文卓 | Stainless steel environment-friendly pickling solution |
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