CN114798390A - Repairing method for rust treatment of steel structure bridge paint film - Google Patents
Repairing method for rust treatment of steel structure bridge paint film Download PDFInfo
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- CN114798390A CN114798390A CN202210617876.5A CN202210617876A CN114798390A CN 114798390 A CN114798390 A CN 114798390A CN 202210617876 A CN202210617876 A CN 202210617876A CN 114798390 A CN114798390 A CN 114798390A
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- steel structure
- paint
- rust
- treatment
- repairing method
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 132
- 239000010959 steel Substances 0.000 title claims abstract description 132
- 239000003973 paint Substances 0.000 title claims abstract description 108
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 26
- 238000004140 cleaning Methods 0.000 claims abstract description 22
- 238000002161 passivation Methods 0.000 claims abstract description 22
- 230000008439 repair process Effects 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000853 adhesive Substances 0.000 claims abstract description 12
- 230000001070 adhesive effect Effects 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 238000005260 corrosion Methods 0.000 claims description 32
- 230000007797 corrosion Effects 0.000 claims description 31
- 230000001680 brushing effect Effects 0.000 claims description 27
- 238000005488 sandblasting Methods 0.000 claims description 21
- 238000005406 washing Methods 0.000 claims description 18
- 230000007935 neutral effect Effects 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229920000647 polyepoxide Polymers 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 5
- 239000003599 detergent Substances 0.000 claims description 5
- 238000007667 floating Methods 0.000 claims description 5
- 239000004519 grease Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 229910002651 NO3 Inorganic materials 0.000 claims description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 4
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 4
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 4
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 claims description 4
- 238000005562 fading Methods 0.000 claims description 4
- 239000010445 mica Substances 0.000 claims description 4
- 229910052618 mica group Inorganic materials 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 4
- 239000008399 tap water Substances 0.000 claims description 4
- 235000020679 tap water Nutrition 0.000 claims description 4
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 4
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 4
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 4
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 claims description 4
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 239000003082 abrasive agent Substances 0.000 claims 1
- 239000011737 fluorine Substances 0.000 claims 1
- 229910052731 fluorine Inorganic materials 0.000 claims 1
- 230000003116 impacting effect Effects 0.000 claims 1
- 238000005554 pickling Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- JVJQPDTXIALXOG-UHFFFAOYSA-N nitryl fluoride Chemical compound [O-][N+](F)=O JVJQPDTXIALXOG-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction 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
- B05D7/14—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
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate 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
- 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
- B05D7/57—Three layers or more the last layer being a clear coat
- B05D7/574—Three layers or more the last layer being a clear coat at least some layers being let to dry at least partially before applying the next layer
-
- 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
- C23C22/73—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 characterised by the process
-
- 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
- C23C22/73—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 characterised by the process
- C23C22/76—Applying the liquid by spraying
-
- 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
- C23C22/78—Pretreatment of the material to be coated
-
- 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
- B05D2301/00—Inorganic additives or organic salts thereof
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Bridges Or Land Bridges (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to the technical field of steel structure bridge repair, and particularly discloses a repair method for rust treatment of a paint film of a steel structure bridge, wherein in practical application, an oxide layer exposed on the surface of a steel structure is removed according to the rust condition of the steel structure, acid pickling paste is coated on the surface of the steel structure, and then the acid pickling paste is cleaned; passivating the surface of the activated steel structure to generate a passivation film on the metal surface; cleaning the surface of the steel structure after passivation treatment; and (4) coating the surface of the exposed steel structure with a repair rust-resistant finish paint, and drying the repair rust-resistant finish paint. In the scheme, before the steel structure surface is coated and repaired with the rust-resistant finish paint, the surface of the substrate is cleaned, pickled and passivated, so that the oxygen molecular structure passivation film formed on the metal surface is promoted, the film layer has a self-repairing effect in the air, the blocking performance of the finish paint on the water vapor on the surface of the substrate can be improved when the rust-resistant finish paint is coated and repaired, and the adhesive force of the finish paint on the substrate is improved.
Description
Technical Field
The invention relates to the technical field of steel structure bridge repair, in particular to a repair method for rust treatment of a paint film of a steel structure bridge.
Background
The existing steel structure bridge is influenced by the external environment or the performance of the self anti-corrosion material, so that the corrosion of the steel structure bridge is very easy to occur in the long-term use process, the overall strength of the bridge is influenced, and the steel structure bridge has great potential safety hazards and generates certain potential safety hazards.
In order to cope with the situation, the service life of the bridge is prolonged, generally, an antirust coating is coated on the surface of the steel beam, but in the existing repair process for the rust corrosion treatment of the steel structure bridge paint film, the original rust coating is not thoroughly treated or the repair construction is not proper, so that the new coating is weak in adhesive force, the service life is short, the repair effect is poor, the repair period is long, the construction cost is increased, and the traffic burden of the construction area is increased to a certain extent.
Disclosure of Invention
The invention aims to provide a repairing method for rust corrosion treatment of a steel structure bridge paint film, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a repairing method for rust treatment of a steel structure bridge paint film comprises the following specific steps:
s1: removing an oxide layer exposed on the surface of the steel structure according to the corrosion condition of the steel structure, and completely removing floating dust and loose particles on the surface by using a dust collector to ensure that the surface of the steel structure is free of oil stain, grease and waxy dirt;
s2: coating acid cleaning paste on the surface of the steel structure treated in the step S1, after the acid cleaning paste is kept still for a period of time, carrying out high-pressure jet washing on the acid cleaning paste by using a large amount of water, and washing the acid cleaning paste on the local surface by using soaking sponge so as to realize the activation treatment on the steel structure;
s3: passivating the surface of the activated steel structure to generate a passivation film on the metal surface;
s4: cleaning and drying the passivated steel structure surface by flowing tap water or demineralized water to ensure that no residual dirt exists on the steel structure surface;
s5: coating an anti-corrosive primer which is high temperature resistant, small in thermal influence and strong in corrosion resistance on the exposed surface of the steel structure, and covering the scratch, local fading and other parts remained on the surface of the steel structure after the treatment by using the anti-corrosive primer so as to keep the surface of the steel structure to be higher in flatness;
s6: coating intermediate paint on the dried antirust primer paint, wherein the brushing direction of the intermediate paint is vertical to the brushing direction of the antirust primer paint;
s7: and coating a repairing rust-resisting finish paint on the dried intermediate paint, wherein the brushing direction of the repairing rust-resisting finish paint is vertical to the brushing direction of the intermediate paint, and after brushing is finished, rapidly drying the repairing rust-resisting finish paint through drying equipment.
As a preferable aspect of the present invention, the method for removing the steel structure oxide layer in step S1 includes:
s11: cleaning oil stains on the surface of a steel structure with relatively intact surface by using a neutral detergent, and washing by using high-pressure water to thoroughly remove the oil stains;
s12: adopting a manual tool to carry out shoveling, brushing and polishing treatment on the surface of the steel structure with the local rusted part, and removing surface coarse grains, and pulverized and aged coatings;
s13: and (4) carrying out sand blasting treatment on the oxide layer damaged in a large range by adopting sand blasting equipment.
As a preferable embodiment of the present invention, in the step S12, when the local rusty portion is polished, the polished portion is at least 5cm beyond the rusty portion and is polished in a slope shape.
As a preferable scheme of the present invention, in step S13, when performing the sand blasting rust removal treatment on the steel structure surface, a sand blasting abrasive with high density and high toughness is used to continuously impact the steel structure surface; the abrasive for blasting comprises iron sand or quartz stone.
In a preferred embodiment of the present invention, the main components of the anti-corrosive primer are: epoxy resin and zinc powder; the intermediate paint comprises the following important components: epoxy resin, mica iron oxide and aluminum tripolyphosphate; the main components of the repair rust-resistant finish paint are as follows: zinc chromate, zinc phosphate and red lead.
In a preferable embodiment of the invention, in the step S5/S6/S7, when the anti-rust primer, the intermediate paint and the repair progenitor rust finish paint are applied, the application direction of each paint layer is kept consistent, the paint layers are connected and rubbed in order, and the spraying nozzle moves in parallel during the application process, so that the thickness of each paint film is kept uniform.
In a preferred embodiment of the present invention, the acid-washing paste applied to the surface of the steel structure in step S2 is a mixture of neutral adhesive and nitric fluoride.
As a preferable scheme of the present invention, the passivation treatment of the steel structure in step S3 is performed by spraying a passivation agent solution or coating a passivation paste.
In a preferred embodiment of the present invention, the solution of the passivating agent is a nitrite, nitrate, chromate or dichromate solution.
As a preferable aspect of the present invention, the present invention is characterized in that: the passivation paste is a mixture of a neutral adhesive and a nitric acid product.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the scheme, before the steel structure surface is coated with the rust-resistant finish paint for repairing, the surface of a base material is cleaned, pickled and passivated, and the passivation promotes the formation of an oxygen molecular structure passivation film on the metal surface.
2. The invention provides a repairing method for corrosion treatment of a paint film of a steel structure bridge, which is characterized in that a primer is coated on the surface of a treated bridge steel structure, an intermediate paint is coated on the primer, and a repairing rust-resisting finish paint is coated on the intermediate paint, so that various components in the primer, the intermediate paint and the finish paint can play a corrosion inhibition role on the steel structure, the corrosion resistance of the steel structure under various acid-base media, corrosive gases or salt spray test environments is improved, the metal surface can be protected within a certain time, and the corrosion speed of the steel structure is reduced.
3. The repairing method for the rust corrosion treatment of the paint film of the steel structure bridge, provided by the invention, has the advantages that the whole repairing process is convenient to construct, the construction period is greatly shortened, the construction cost is reduced, the construction efficiency is improved, and the time for closing a road is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1: a repairing method for rust treatment of a steel structure bridge paint film comprises the following specific steps:
s1: removing an oxide layer exposed on the surface of the steel structure according to the corrosion condition of the steel structure, and completely removing floating dust and loose particles on the surface by using a dust collector to ensure that the surface of the steel structure is free of oil stain, grease and waxy dirt;
s2: coating acid cleaning paste on the surface of the steel structure treated in the step S1, after the acid cleaning paste is kept still for a period of time, carrying out high-pressure jet washing on the acid cleaning paste by using a large amount of water, and washing the acid cleaning paste on the local surface by using soaking sponge so as to realize the activation treatment on the steel structure;
s3: passivating the surface of the activated steel structure to generate a passivation film on the metal surface;
s4: cleaning and drying the passivated steel structure surface by flowing tap water or demineralized water to ensure that no residual dirt exists on the steel structure surface;
s5: coating an anti-corrosive primer which is high temperature resistant, small in thermal influence and strong in corrosion resistance on the exposed surface of the steel structure, and covering the scratch, local fading and other parts remained on the surface of the steel structure after the treatment by using the anti-corrosive primer so as to keep the surface of the steel structure to be higher in flatness;
s6: coating intermediate paint on the dried antirust primer paint, wherein the brushing direction of the intermediate paint is vertical to the brushing direction of the antirust primer paint;
s7: and coating a repairing rust-resisting finish paint on the dried intermediate paint, wherein the brushing direction of the repairing rust-resisting finish paint is vertical to the brushing direction of the intermediate paint, and after brushing is finished, rapidly drying the repairing rust-resisting finish paint through drying equipment.
As a preferable aspect of the present invention, the method for removing the steel structure oxide layer in step S1 includes:
s11: cleaning oil stains on the surface of a steel structure with relatively intact surface by using a neutral detergent, and washing by using high-pressure water to thoroughly remove the oil stains;
s12: shoveling, brushing and polishing the surface of the steel structure with a rusted part by using a manual tool to remove coarse grains on the surface and pulverized and aged coatings;
s13: and (4) carrying out sand blasting treatment on the oxide layer damaged in a large range by adopting sand blasting equipment.
As a preferable embodiment of the present invention, in the step S12, when the local rusty portion is polished, the polished portion is at least 5cm beyond the rusty portion and is polished in a slope shape.
As a preferable scheme of the present invention, in step S13, when performing the sand blasting rust removal treatment on the steel structure surface, a sand blasting abrasive with high density and high toughness is used to continuously impact the steel structure surface; the abrasive for blasting comprises iron sand or quartz stone.
In a preferred embodiment of the present invention, the main components of the anti-corrosive primer are: epoxy resin and zinc powder; the intermediate paint comprises the following important components: epoxy resin, mica iron oxide and aluminum tripolyphosphate; the main components of the repair rust-resisting finish paint are as follows: zinc chromate, zinc phosphate and red lead.
In a preferable embodiment of the invention, in the step S5/S6/S7, when the anti-rust primer, the intermediate paint and the repair progenitor rust finish paint are applied, the application direction of each paint layer is kept consistent, the paint layers are connected and rubbed in order, and the spraying nozzle moves in parallel during the application process, so that the thickness of each paint film is kept uniform.
In a preferred embodiment of the present invention, the acid-washing paste applied to the surface of the steel structure in step S2 is a mixture of neutral adhesive and nitric fluoride.
As a preferable scheme of the present invention, the passivation treatment of the steel structure in step S3 is performed by spraying a passivation agent solution or coating a passivation paste.
In a preferred embodiment of the present invention, the solution of the passivating agent is a nitrite, nitrate, chromate or dichromate solution.
As a preferable aspect of the present invention, the present invention is characterized in that: the passivation paste is a mixture of a neutral adhesive and a nitric acid product.
Example 2: a repairing method for rust treatment of a steel structure bridge paint film comprises the following specific steps:
s1: removing an oxide layer exposed on the surface of the steel structure according to the corrosion condition of the steel structure, and completely removing floating dust and loose particles on the surface by using a dust collector to ensure that the surface of the steel structure is free of oil stain, grease and waxy dirt;
s2: coating an anti-corrosive primer which is high temperature resistant, small in thermal influence and strong in corrosion resistance on the exposed surface of the steel structure, and covering the scratch, local fading and other parts remained on the surface of the steel structure after the treatment by using the anti-corrosive primer so as to keep the surface of the steel structure to be higher in flatness;
s3: coating intermediate paint on the dried antirust primer paint, wherein the brushing direction of the intermediate paint is vertical to the brushing direction of the antirust primer paint;
s4: and coating a repairing rust-resisting finish paint on the dried intermediate paint, wherein the brushing direction of the repairing rust-resisting finish paint is vertical to the brushing direction of the intermediate paint, and after brushing is finished, rapidly drying the repairing rust-resisting finish paint through drying equipment.
As a preferable aspect of the present invention, the method for removing the steel structure oxide layer in step S1 includes:
s11: cleaning oil stains on the surface of a steel structure with relatively intact surface by using a neutral detergent, and washing by using high-pressure water to thoroughly remove the oil stains;
s12: adopting a manual tool to carry out shoveling, brushing and polishing treatment on the surface of the steel structure with the local rusted part, and removing surface coarse grains, and pulverized and aged coatings;
s13: and (4) carrying out sand blasting treatment on the oxide layer damaged in a large range by adopting sand blasting equipment.
As a preferable embodiment of the present invention, in the step S12, when the local rusty portion is polished, the polished portion is at least 5cm beyond the rusty portion and is polished in a slope shape.
As a preferable scheme of the present invention, in step S13, when performing the sand blasting rust removal treatment on the steel structure surface, a sand blasting abrasive with high density and high toughness is used to continuously impact the steel structure surface; the blasting abrasive includes iron sand or quartz stone.
In a preferred embodiment of the present invention, the main components of the anti-corrosive primer are: epoxy resin and zinc powder; the intermediate paint comprises the following important components: epoxy resin, mica iron oxide and aluminum tripolyphosphate; the main components of the repair rust-resistant finish paint are as follows: zinc chromate, zinc phosphate and red lead.
In a preferable embodiment of the invention, in the step S2/S3/S4, when the anti-rust primer, the intermediate paint and the repair progenitor rust finish paint are applied, the application direction of each paint layer is kept consistent, the paint layers are connected and rubbed in order, and the spraying nozzle moves in parallel during the application process, so that the thickness of each paint film is kept uniform.
Example 2 is identical to the paint coating process of the above examples, except that the pretreatment process for the bridge steel structure is different.
Example 3: a repairing method for rust treatment of a steel structure bridge paint film comprises the following specific steps:
s1: removing an oxide layer exposed on the surface of the steel structure according to the corrosion condition of the steel structure, and completely removing floating dust and loose particles on the surface by using a dust collector to ensure that the surface of the steel structure is free of oil stain, grease and waxy dirt;
the method for removing the steel structure oxide layer in the step S1 includes:
s11: cleaning oil stains on the surface of a steel structure with relatively intact surface by using a neutral detergent, and washing by using high-pressure water to thoroughly remove the oil stains;
s12: adopting a manual tool to carry out shoveling, brushing and polishing treatment on the surface of the steel structure with the local rusted part, and removing surface coarse grains, and pulverized and aged coatings; when a local rusty part is polished, the polished part at least exceeds the rusty part by 5cm and is polished in a slope shape;
s13: carrying out sand blasting treatment on the large-range damaged oxide layer by adopting sand blasting equipment, and carrying out continuous impact on the surface of the steel structure by adopting sand blasting abrasive with higher density and stronger toughness when carrying out sand blasting rust removal treatment on the surface of the steel structure; the sand blasting abrasive comprises iron sand or quartz stone;
s2: coating acid washing paste on the surface of the steel structure treated in the step S1, wherein the acid washing paste is a mixture of neutral adhesive and nitric fluoride;
after the pickling paste is kept stand for a period of time, carrying out high-pressure jet washing on the pickling paste by using a large amount of water, and washing the pickling paste on the local surface by using a soaking sponge so as to realize the activation treatment on the steel structure;
s3: passivating the surface of the steel structure after activation treatment to generate a passivation film (a three-dimensional phase forming film or a two-dimensional adsorption layer) on the surface of the steel structure, wherein the passivation film on the surface of the steel structure plays a role in physical isolation on the surface of the steel structure, so that the corrosion speed of the steel structure is greatly reduced, and the corrosion resistance of the steel structure is improved;
the passivation treatment of the steel structure in the step S3 is carried out by spraying a passivating agent solution or coating a passivating paste; the passivating agent solution is a nitrite solution, a nitrate solution, a chromate solution or a dichromate solution; the passivation paste is a mixture of neutral adhesive and nitric acid products;
s4: cleaning and drying the passivated steel structure surface by flowing tap water or demineralized water to ensure that no residual dirt exists on the steel structure surface;
s5: coating the surface of the exposed steel structure with a repair rust-resistant finish paint, and drying the repair rust-resistant finish paint; the repairing rust-resistant finish paint is coated in a double-layer covering mode, and the coating time interval of the two layers of repairing rust-resistant finish paint is 6-8 hours.
The embodiment 3 is the same as the pretreatment process for the bridge steel structure in the above embodiments, except that the paint coating process for the pretreated bridge steel structure is different.
The steel structure bridge paint films repaired by the repairing method for the corrosion treatment of the steel structure bridge paint film in the examples 1-3 are tested on the aspects of adhesive force, liquid resistance, flexibility, temperature change resistance, impact resistance and the like under the same environmental factors, and the results are evaluated by A, B, C, D, and the following tables show that:
| sample (I) | Adhesion force | Liquid-proof agent | Flexibility | Temperature change resistance | Impact resistance |
| Example 1 | A | A | B | A | A |
| Example 2 | C | B | B | C | C |
| Example 3 | A | B | B | B | C |
It can be seen from the table that the steel structure bridge paint film repaired by the repairing method for the corrosion treatment of the steel structure bridge paint film provided in the embodiment 1 has better effects in the aspects of adhesive force, liquid resistance, flexibility, temperature change resistance and impact resistance.
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 (10)
1. A repairing method for corrosion treatment of a steel structure bridge paint film is characterized by comprising the following steps: the method comprises the following specific steps:
s1: removing an oxide layer exposed on the surface of the steel structure according to the corrosion condition of the steel structure, and completely removing floating dust and loose particles on the surface by using a dust collector to ensure that the surface of the steel structure is free of oil stain, grease and waxy dirt;
s2: coating acid cleaning paste on the surface of the steel structure treated in the step S1, after the acid cleaning paste is kept still for a period of time, carrying out high-pressure jet washing on the acid cleaning paste by using a large amount of water, and washing the acid cleaning paste on the local surface by using soaking sponge so as to realize the activation treatment on the steel structure;
s3: passivating the surface of the activated steel structure to generate a passivation film on the metal surface;
s4: cleaning and drying the passivated steel structure surface by flowing tap water or demineralized water to ensure that no residual dirt exists on the steel structure surface;
s5: coating an anti-corrosive primer which is high temperature resistant, small in thermal influence and strong in corrosion resistance on the exposed surface of the steel structure, and covering the scratch, local fading and other parts remained on the surface of the steel structure after the treatment by using the anti-corrosive primer so as to keep the surface of the steel structure to be higher in flatness;
s6: coating intermediate paint on the dried antirust primer paint, wherein the brushing direction of the intermediate paint is vertical to the brushing direction of the antirust primer paint;
s7: and coating a repairing rust-resisting finish paint on the dried intermediate paint, wherein the brushing direction of the repairing rust-resisting finish paint is vertical to the brushing direction of the intermediate paint, and after brushing is finished, rapidly drying the repairing rust-resisting finish paint through drying equipment.
2. The repairing method for the corrosion treatment of the paint film of the steel structure bridge according to claim 1, characterized by comprising the following steps: the method for removing the steel structure oxide layer in the step S1 includes:
s11: cleaning oil stains on the surface of a steel structure with relatively intact surface by using a neutral detergent, and washing by using high-pressure water to thoroughly remove the oil stains;
s12: adopting a manual tool to carry out shoveling, brushing and polishing treatment on the surface of the steel structure with the local rusted part, and removing surface coarse grains, and pulverized and aged coatings;
s13: and (4) carrying out sand blasting treatment on the oxide layer damaged in a large range by adopting sand blasting equipment.
3. The repairing method for the corrosion treatment of the paint film of the steel structure bridge as claimed in claim 2, wherein the repairing method comprises the following steps: in step S12, when the local rusted portion is polished, the polished portion at least exceeds the rusted portion by 5cm, and is polished in a slope shape.
4. The repairing method for the corrosion treatment of the paint film of the steel structure bridge as claimed in claim 2, wherein the repairing method comprises the following steps: in the step S13, when performing the sand blasting rust removal treatment on the steel structure surface, continuously impacting the steel structure surface with a sand blasting abrasive material with high density and high toughness; the blasting abrasive includes iron sand or quartz stone.
5. The repairing method for the corrosion treatment of the paint film of the steel structure bridge according to claim 1, characterized by comprising the following steps: the main components of the anti-rust primer are as follows: epoxy resin and zinc powder; the intermediate paint comprises the following important components: epoxy resin, mica iron oxide and aluminum tripolyphosphate; the main components of the repair rust-resistant finish paint are as follows: zinc chromate, zinc phosphate and red lead.
6. The repairing method for the corrosion treatment of the paint film of the steel structure bridge according to claim 1, characterized by comprising the following steps: in the step S5/S6/S7, when the anti-rust primer, the intermediate paint and the repair rust-resisting finish paint are brushed, the brushing direction of each paint layer is kept consistent, the paint layers are jointed and rubbed orderly, and the spraying nozzles move in parallel in the brushing process, so that the thickness of each paint film is kept uniform and consistent.
7. The repairing method for the corrosion treatment of the paint film of the steel structure bridge according to claim 1, characterized by comprising the following steps: the acid-washing paste coated on the surface of the steel structure in the step S2 is a mixture of neutral adhesive and fluorine and nitric acid.
8. The repairing method for the rust corrosion treatment of the steel structure bridge paint film according to claim 1, characterized by comprising the following steps: and the passivation treatment of the steel structure in the step S3 is carried out by adopting a passivating agent spraying solution or a passivating paste coating.
9. The repairing method for the paint film corrosion treatment of the steel structure bridge according to claim 8, characterized by comprising the following steps: the passivating agent solution is a nitrite solution, a nitrate solution, a chromate solution or a dichromate solution.
10. The repairing method for the rust corrosion treatment of the steel structure bridge paint film according to claim 8, characterized by comprising the following steps: the passivation paste is a mixture of a neutral adhesive and a nitric acid product.
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| CN111013987A (en) * | 2019-12-12 | 2020-04-17 | 广东中烨建筑钢构有限公司 | Steel structure anticorrosion construction process |
| CN112676130A (en) * | 2020-11-17 | 2021-04-20 | 中交第三公路工程局有限公司 | Bridge steel structure coating method |
| CN114130634A (en) * | 2021-10-29 | 2022-03-04 | 宁夏兴昊永胜盐业科技有限公司 | Steel structure rust removal and corrosion prevention method |
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| CN111013987A (en) * | 2019-12-12 | 2020-04-17 | 广东中烨建筑钢构有限公司 | Steel structure anticorrosion construction process |
| CN112676130A (en) * | 2020-11-17 | 2021-04-20 | 中交第三公路工程局有限公司 | Bridge steel structure coating method |
| CN114130634A (en) * | 2021-10-29 | 2022-03-04 | 宁夏兴昊永胜盐业科技有限公司 | Steel structure rust removal and corrosion prevention method |
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Application publication date: 20220729 |