CN114713483A - Surface zinc-spraying anti-corrosion treatment process for nodular cast iron pipe - Google Patents
Surface zinc-spraying anti-corrosion treatment process for nodular cast iron pipe Download PDFInfo
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- CN114713483A CN114713483A CN202210423335.9A CN202210423335A CN114713483A CN 114713483 A CN114713483 A CN 114713483A CN 202210423335 A CN202210423335 A CN 202210423335A CN 114713483 A CN114713483 A CN 114713483A
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- degreasing
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- 238000005507 spraying Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 56
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 32
- 238000005260 corrosion Methods 0.000 title claims abstract description 24
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000010276 construction Methods 0.000 claims abstract description 41
- 239000011701 zinc Substances 0.000 claims abstract description 37
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 37
- 238000004140 cleaning Methods 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 239000003973 paint Substances 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 238000004381 surface treatment Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 8
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 7
- 231100000719 pollutant Toxicity 0.000 claims abstract description 7
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 36
- 239000011248 coating agent Substances 0.000 claims description 30
- 238000000576 coating method Methods 0.000 claims description 30
- 238000005238 degreasing Methods 0.000 claims description 29
- 238000005422 blasting Methods 0.000 claims description 24
- 239000003960 organic solvent Substances 0.000 claims description 24
- 238000005488 sandblasting Methods 0.000 claims description 23
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 18
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000012459 cleaning agent Substances 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 12
- 239000010409 thin film Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 239000010408 film Substances 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000003085 diluting agent Substances 0.000 claims description 6
- 238000009956 embroidering Methods 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 239000002957 persistent organic pollutant Substances 0.000 claims description 6
- 239000000565 sealant Substances 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 abstract description 10
- 239000007921 spray Substances 0.000 abstract description 7
- 239000000853 adhesive Substances 0.000 abstract description 5
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 238000004210 cathodic protection Methods 0.000 abstract description 2
- 238000005246 galvanizing Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005536 corrosion prevention Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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Classifications
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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
-
- 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
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- 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
- 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
- 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
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
-
- 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
- B05D2254/00—Tubes
- B05D2254/02—Applying the material on the exterior of the tube
Landscapes
- 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 zinc-spraying anti-corrosion treatment process for the surface of a nodular cast iron pipe, which comprises the following steps: surface treatment, namely treating the surface of the nodular cast iron pipe, wherein the zinc spraying construction has higher requirement on a substrate, the cold zinc spraying adhesive force can be influenced if the surface of the substrate is not completely treated or pollutants exist, and impurities on the surface of the pipe are washed away by a cleaning tool; the cold spray zinc is different from general paint, and a dry film of the cold spray zinc contains more than 96 percent of pure zinc, so that the cold spray zinc can provide good cathodic protection for steel. The steel surface can be protected for a long time even in a very harsh environment. The corrosion resistance can be comparable to or even superior to that of hot galvanizing, and the relative humidity in the construction environment is controlled in the reuse process, so that the corrosion resistance effect of cold spray zinc is improved.
Description
Technical Field
The invention relates to the technical field of nodular cast iron pipes, in particular to a surface zinc-spraying anti-corrosion treatment process for a nodular cast iron pipe.
Background
The nodular cast iron pipe is a pipe which is formed by adding a nodulizer into cast molten iron above No. 18 and then centrifugally casting the molten iron at a high speed by a centrifugal nodular cast iron machine, and is called a nodular cast iron pipe, a nodular cast iron pipe and the like for short. The surface corrosion prevention material is mainly used for conveying tap water, is an ideal selective material for tap water pipelines, and is not required to pay attention to the humidity in a construction environment during the use in the traditional surface corrosion prevention process of the nodular cast iron, so that the quality of a corrosion prevention layer on the surface of a pipe is different, and the nodular cast iron pipe is prone to local corrosion and serious.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a zinc spraying anti-corrosion treatment process for the surface of a nodular cast iron pipe.
The invention provides a zinc-spraying anti-corrosion treatment process for the surface of a nodular cast iron pipe, which comprises the following steps:
s1: surface treatment, namely treating the surface of the nodular cast iron pipe, wherein the zinc spraying construction has higher requirement on a substrate, the cold zinc spraying adhesive force can be influenced if the surface of the substrate is not completely treated or pollutants exist, and impurities on the surface of the pipe are washed away by a cleaning tool;
s2: degreasing, namely degreasing by dissolving saponified oil and unsaponifiable oil in an organic solvent, wherein the common organic solvent comprises ethanol, gasoline for cleaning, toluene, carbon tetrachloride, trichloroethylene and the like, wherein the effective solvent comprises carbon tetrachloride and trichloroethylene, the carbon tetrachloride and the trichloroethylene can not burn, degreasing can be carried out at a higher temperature, the degreasing is carried out thoroughly, the paint film is gelled, solidified and peeled after the organic solvent is stained with the oil, and the oil is thoroughly cleaned before sand blasting;
s3: performing shot blasting treatment, wherein the surface of the pipe needs to be subjected to sand blasting or shot blasting treatment, common quartz sand, corner sand, carborundum and steel shot can provide a certain rough surface and cleaning effect, and the grinding material needs to be kept clean and has no organic pollutants;
s4: cleaning, namely cleaning by using compressed air after sand blasting or shot blasting treatment, wherein the surface of the pipe needs to be kept oilless, coating is carried out within 4h, and rust removal is needed when the re-embroidering phenomenon occurs;
s5: coating construction, wherein zinc spraying has extremely high solid content, so that when in use, an electric or pneumatic tool is used for fully and uniformly stirring the coating, then a special diluent and a curing agent are added according to a certain proportion, and construction is carried out after uniform stirring, and in order to keep the zinc powder in a suspension state, the coating must be kept in a continuous stirring state;
s6: experiment, the pipeline after spraying paint is stood and placed for a period of time, then a plurality of zinc-sprayed pipes are randomly selected for carrying out an anticorrosion experiment, then comparison is carried out, a sample is placed in the same simulation environment for a period of time, then the condition of the surface of the sample is observed, and then the thickness of an anticorrosion layer is measured through instruments respectively.
Further, in the oil removing process, it is noted that after the oil is removed by the organic solvent, additional oil removal is also required, because after the solvent is volatilized on the surface of the pipe, a thin film is usually left, and the thin film can be removed by the processes of alkali cleaning oil removal, electrochemical oil removal and the like in the subsequent process.
Furthermore, in the shot blasting treatment process, the surface of the pipe needs to be inspected according to the national standard roughness grade, the surface needs to reach Sa2.5 grade, and the surface needs to reach Sa3 grade when the corrosion is serious.
Furthermore, the coating construction has certain requirements on the environment, in order to ensure the quality of sand blasting, the relative humidity is kept at the best of 40-60%, the temperature of a steel plate is higher than the dew point by 3 ℃, the environmental temperature cannot be lower than 5 ℃ during cold 0 zinc spraying construction, and the highest temperature cannot exceed 40 ℃.
Furthermore, the construction process needs to be carried out for three times in total, namely spraying the first primer, the second sealant and the third finish, wherein the thickness of the primer is 80 mu m.
Further, a special cleaning agent should be used in the surface treatment process, the surface of the pipe cannot be contaminated by impurities in the pipe through the special cleaning agent, and meanwhile, the treatment quality is improved.
The beneficial effects of the invention are as follows:
1. the cold spray zinc of the invention is different from the common paint, and the dry film of the cold spray zinc contains more than 96 percent of pure zinc, thus being capable of providing good cathodic protection for steel. The steel surface can be protected for a long time even in a very harsh environment. The corrosion resistance can be comparable to or even superior to that of hot galvanizing, and the relative humidity in the construction environment is controlled in the reuse process, so that the corrosion resistance effect of cold spray zinc is improved.
Drawings
FIG. 1 is a flow chart of the surface zinc-spraying anti-corrosion treatment process for nodular cast iron pipes provided by the invention;
fig. 2 is a comparison table of humidity and primer thickness of the surface zinc-spraying anticorrosion treatment process for nodular cast iron pipes provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Example one
Referring to fig. 1-2, the surface zinc-spraying anti-corrosion treatment process for the nodular cast iron pipe comprises the following steps:
s1: surface treatment, namely treating the surface of the nodular cast iron pipe, wherein the zinc spraying construction has higher requirement on a substrate, the cold zinc spraying adhesion is influenced if the substrate surface is not completely treated or pollutants exist, and impurities on the surface of the pipe are washed away by a cleaning tool;
s2: degreasing, namely degreasing by dissolving saponified oil and unsaponifiable oil in an organic solvent, wherein the common organic solvent comprises ethanol, gasoline for cleaning, toluene, carbon tetrachloride, trichloroethylene and the like, wherein the effective solvent comprises carbon tetrachloride and trichloroethylene, the carbon tetrachloride and the trichloroethylene can not burn, degreasing can be carried out at a higher temperature, the degreasing is carried out thoroughly, the paint film is gelled, solidified and peeled after the organic solvent is stained with the oil, and the oil is thoroughly cleaned before sand blasting;
s3: performing shot blasting treatment, wherein the surface of the pipe needs to be subjected to sand blasting or shot blasting treatment, common quartz sand, corner sand, carborundum and steel shots can provide a certain rough surface and cleaning effect, and the grinding materials need to be kept clean and have no organic pollutants;
s4: cleaning, wherein oil-free surface of the pipe needs to be kept after sand blasting or shot blasting treatment, the pipe is cleaned by compressed air, coating is carried out within 4h, and rust removal is needed when the phenomenon of re-embroidering occurs;
s5: coating construction, wherein zinc spraying has extremely high solid content, so that when in use, an electric or pneumatic tool is used for fully and uniformly stirring the coating, then a special diluent and a curing agent are added according to a certain proportion, and construction is carried out after uniform stirring, and in order to keep the zinc powder in a suspension state, the coating must be kept in a continuous stirring state;
s6: experiment, the pipeline after spraying paint is stood and placed for a period of time, then a plurality of zinc-sprayed pipes are randomly selected for carrying out an anticorrosion experiment, then comparison is carried out, a sample is placed in the same simulation environment for a period of time, then the condition of the surface of the sample is observed, and then the thickness of an anticorrosion layer is measured through instruments respectively.
In the invention, attention is required to be paid in the oil removing process, after the oil is removed by an organic solvent, the oil is required to be supplemented and removed, because a thin film is usually remained after the solvent is volatilized on the surface of the pipe, the thin film can be removed by alkali cleaning oil removal, electrochemical oil removal and other processes in the subsequent processes, the surface of the pipe is required to be inspected according to the national standard roughness grade in the shot blasting treatment process, the Sa2.5 grade is required to be reached, the Sa3 grade is required to be reached to the serious corrosion, certain requirements of coating construction on the environment are required, in order to ensure the quality of sand blasting, the relative humidity is kept to be the best 35 percent, the temperature of a steel plate is higher than the dew point temperature by 3 ℃, the environmental temperature cannot be lower than 5 ℃ in cold 0 zinc spraying construction, the highest temperature cannot exceed 40 ℃, three times of spraying are required in the construction process, the first primer, the second sealant and the third finish coat are required, wherein the thickness of the primer is 73 mu m, the special cleaning agent is used in the surface treatment process, the surface of the pipe cannot be polluted by impurities in the pipe through the special cleaning agent, and the treatment quality is improved.
Example two
Referring to fig. 1-2, the surface zinc-spraying anti-corrosion treatment process for the nodular cast iron pipe comprises the following steps:
s1: surface treatment, namely treating the surface of the nodular cast iron pipe, wherein the zinc spraying construction has higher requirement on a substrate, the cold zinc spraying adhesive force can be influenced if the surface of the substrate is not completely treated or pollutants exist, and impurities on the surface of the pipe are washed away by a cleaning tool;
s2: degreasing, namely degreasing by dissolving saponified oil and unsaponifiable oil in an organic solvent, wherein the common organic solvent comprises ethanol, gasoline for cleaning, toluene, carbon tetrachloride, trichloroethylene and the like, wherein the effective solvent comprises carbon tetrachloride and trichloroethylene, the carbon tetrachloride and the trichloroethylene can not burn, degreasing can be carried out at a higher temperature, the degreasing is carried out thoroughly, the paint film is gelled, solidified and peeled after the organic solvent is stained with the oil, and the oil is thoroughly cleaned before sand blasting;
s3: performing shot blasting treatment, wherein the surface of the pipe needs to be subjected to sand blasting or shot blasting treatment, common quartz sand, corner sand, carborundum and steel shots can provide a certain rough surface and cleaning effect, and the grinding materials need to be kept clean and have no organic pollutants;
s4: cleaning, wherein oil-free surface of the pipe needs to be kept after sand blasting or shot blasting treatment, the pipe is cleaned by compressed air, coating is carried out within 4h, and rust removal is needed when the phenomenon of re-embroidering occurs;
s5: coating construction, wherein zinc spraying has extremely high solid content, so that when in use, an electric or pneumatic tool is used for fully and uniformly stirring the coating, then a special diluent and a curing agent are added according to a certain proportion, and construction is carried out after uniform stirring, and in order to keep the zinc powder in a suspension state, the coating must be kept in a continuous stirring state;
s6: experiment, the pipeline after spraying paint is stood and placed for a period of time, then a plurality of zinc-sprayed pipes are randomly selected for carrying out an anticorrosion experiment, then comparison is carried out, a sample is placed in the same simulation environment for a period of time, then the condition of the surface of the sample is observed, and then the thickness of an anticorrosion layer is measured through instruments respectively.
In the invention, attention is required to be paid in the oil removing process, after the oil is removed by an organic solvent, the oil is required to be supplemented and removed, because a thin film is usually remained after the solvent is volatilized on the surface of the pipe, the thin film can be removed by alkali cleaning oil removal, electrochemical oil removal and other processes in the subsequent processes, the surface of the pipe is required to be inspected according to the national standard roughness grade in the shot blasting treatment process, the Sa2.5 grade is required to be reached, the Sa3 grade is required to be reached to the serious corrosion, certain requirements of coating construction on the environment are required, in order to ensure the quality of sand blasting, the relative humidity is kept at the best of 45 percent, the temperature of a steel plate is higher than the dew point temperature by 3 ℃, the environmental temperature cannot be lower than 5 ℃ in cold 0 zinc spraying construction, the highest temperature cannot exceed 40 ℃, three times of spraying are required in the construction process, a first primer, a second sealant and a third finish coat are required, wherein the thickness of the primer is 82 mu m, the special cleaning agent is used in the surface treatment process, the surface of the pipe cannot be polluted by impurities in the pipe through the special cleaning agent, and the treatment quality is improved.
EXAMPLE III
Referring to fig. 1-2, the surface zinc-spraying anti-corrosion treatment process for the nodular cast iron pipe comprises the following steps:
s1: surface treatment, namely treating the surface of the nodular cast iron pipe, wherein the zinc spraying construction has higher requirement on a substrate, the cold zinc spraying adhesive force can be influenced if the surface of the substrate is not completely treated or pollutants exist, and impurities on the surface of the pipe are washed away by a cleaning tool;
s2: degreasing, namely degreasing by dissolving saponified oil and unsaponifiable oil in an organic solvent, wherein the common organic solvent comprises ethanol, gasoline for cleaning, toluene, carbon tetrachloride, trichloroethylene and the like, wherein the effective solvent comprises carbon tetrachloride and trichloroethylene, the carbon tetrachloride and the trichloroethylene can not burn, degreasing can be carried out at a higher temperature, the degreasing is carried out thoroughly, the paint film is gelled, solidified and peeled after the organic solvent is stained with the oil, and the oil is thoroughly cleaned before sand blasting;
s3: performing shot blasting treatment, wherein the surface of the pipe needs to be subjected to sand blasting or shot blasting treatment, common quartz sand, corner sand, carborundum and steel shot can provide a certain rough surface and cleaning effect, and the grinding material needs to be kept clean and has no organic pollutants;
s4: cleaning, wherein oil-free surface of the pipe needs to be kept after sand blasting or shot blasting treatment, the pipe is cleaned by compressed air, coating is carried out within 4h, and rust removal is needed when the phenomenon of re-embroidering occurs;
s5: coating construction, wherein zinc spraying has extremely high solid content, so that when in use, an electric or pneumatic tool is used for fully and uniformly stirring the coating, then a special diluent and a curing agent are added according to a certain proportion, and construction is carried out after uniform stirring, and in order to keep the zinc powder in a suspension state, the coating must be kept in a continuous stirring state;
s6: experiment, the pipeline after spraying paint is stood and placed for a period of time, then a plurality of zinc-sprayed pipes are randomly selected for carrying out an anticorrosion experiment, then comparison is carried out, a sample is placed in the same simulation environment for a period of time, then the condition of the surface of the sample is observed, and then the thickness of an anticorrosion layer is measured through instruments respectively.
In the invention, attention is required to be paid in the oil removing process, after the oil is removed by an organic solvent, the oil is required to be supplemented and removed, because a thin film is usually remained after the solvent is volatilized on the surface of the pipe, the thin film can be removed by alkali cleaning oil removal, electrochemical oil removal and other processes in the subsequent processes, the surface of the pipe is required to be inspected according to the national standard roughness grade in the shot blasting treatment process, the Sa2.5 grade is required to be reached, the Sa3 grade is required to be reached to the serious corrosion, certain requirements of coating construction on the environment are required, in order to ensure the quality of sand blasting, the relative humidity is kept at the best 55%, the temperature of a steel plate is higher than the dew point temperature by 3 ℃, the environmental temperature cannot be lower than 5 ℃ in cold 0 zinc spraying construction, the highest temperature cannot exceed 40 ℃, three times of spraying are required in the construction process, the first primer, the second sealant and the third finish, wherein the thickness of the primer is 86 μm, the special cleaning agent is used in the surface treatment process, the surface of the pipe cannot be polluted by impurities in the pipe through the special cleaning agent, and the treatment quality is improved.
Example four
Referring to fig. 1-2, the surface zinc-spraying anti-corrosion treatment process for the nodular cast iron pipe comprises the following steps:
s1: surface treatment, namely treating the surface of the nodular cast iron pipe, wherein the zinc spraying construction has higher requirement on a substrate, the cold zinc spraying adhesive force can be influenced if the surface of the substrate is not completely treated or pollutants exist, and impurities on the surface of the pipe are washed away by a cleaning tool;
s2: degreasing, namely degreasing by dissolving saponified oil and unsaponifiable oil in an organic solvent, wherein the common organic solvent comprises ethanol, gasoline for cleaning, toluene, carbon tetrachloride, trichloroethylene and the like, wherein the effective solvent comprises carbon tetrachloride and trichloroethylene, the carbon tetrachloride and the trichloroethylene can not burn, degreasing can be carried out at a higher temperature, the degreasing is carried out thoroughly, the paint film is gelled, solidified and peeled after the organic solvent is stained with the oil, and the oil is thoroughly cleaned before sand blasting;
s3: performing shot blasting treatment, wherein the surface of the pipe needs to be subjected to sand blasting or shot blasting treatment, common quartz sand, corner sand, carborundum and steel shot can provide a certain rough surface and cleaning effect, and the grinding material needs to be kept clean and has no organic pollutants;
s4: cleaning, wherein oil-free surface of the pipe needs to be kept after sand blasting or shot blasting treatment, the pipe is cleaned by compressed air, coating is carried out within 4h, and rust removal is needed when the phenomenon of re-embroidering occurs;
s5: coating construction, wherein the zinc spraying has extremely high solid content, so that when in use, an electric or pneumatic tool is used to fully and uniformly stir the coating, then a special diluent and a curing agent are added according to a certain proportion, and construction is carried out after uniform stirring, and the coating must be kept in a continuous stirring state in order to keep the zinc powder in a suspension state;
s6: experiment, the pipeline after spraying paint is stood and placed for a period of time, then a plurality of zinc-sprayed pipes are randomly selected for carrying out an anticorrosion experiment, then comparison is carried out, a sample is placed in the same simulation environment for a period of time, then the condition of the surface of the sample is observed, and then the thickness of an anticorrosion layer is measured through instruments respectively.
In the invention, attention is required to be paid in the oil removing process, after the oil is removed by an organic solvent, the oil is required to be supplemented and removed, because a thin film is usually remained after the solvent is volatilized on the surface of the pipe, the thin film can be removed by alkali cleaning oil removal, electrochemical oil removal and other processes in the subsequent processes, the surface of the pipe is required to be inspected according to the national standard roughness grade in the shot blasting treatment process, the Sa2.5 grade is required to be reached, the Sa3 grade is required to be reached to the serious corrosion, certain requirements of coating construction on the environment are required, in order to ensure the quality of sand blasting, the relative humidity is kept at the optimum 65%, the temperature of a steel plate is higher than the dew point temperature by 3 ℃, the environmental temperature cannot be lower than 5 ℃ in cold 0 zinc spraying construction, the highest temperature cannot exceed 40 ℃, three times of spraying are required in the construction process, the first primer, the second sealant and the third finish, wherein the thickness of the primer is 66 mu m, the special cleaning agent is used in the surface treatment process, the surface of the pipe cannot be polluted by impurities in the pipe through the special cleaning agent, and the treatment quality is improved.
In summary, the humidity of the construction environment is in the range of 40-60%, the thickness of the primer is about 80 μm, and when the humidity exceeds or falls below the range, the adhesion between the primer and the surface of the pipe is reduced, thereby affecting the normal thickness of the primer.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The surface zinc spraying anticorrosion treatment process for the nodular cast iron pipe is characterized by comprising the following steps:
s1: surface treatment, namely treating the surface of the nodular cast iron pipe, wherein the zinc spraying construction has higher requirement on a substrate, the cold zinc spraying adhesion is influenced if the substrate surface is not completely treated or pollutants exist, and impurities on the surface of the pipe are washed away by a cleaning tool;
s2: degreasing, namely degreasing by dissolving saponified oil and unsaponifiable oil in an organic solvent, wherein the common organic solvent comprises ethanol, gasoline for cleaning, toluene, carbon tetrachloride, trichloroethylene and the like, wherein the effective solvent comprises carbon tetrachloride and trichloroethylene, the carbon tetrachloride and the trichloroethylene can not burn, degreasing can be carried out at a higher temperature, the degreasing is carried out thoroughly, the paint film is gelled, solidified and peeled after the organic solvent is stained with the oil, and the oil is thoroughly cleaned before sand blasting;
s3: performing shot blasting treatment, wherein the surface of the pipe needs to be subjected to sand blasting or shot blasting treatment, common quartz sand, corner sand, carborundum and steel shots can provide a certain rough surface and cleaning effect, and the grinding materials need to be kept clean and have no organic pollutants;
s4: cleaning, wherein oil-free surface of the pipe needs to be kept after sand blasting or shot blasting treatment, the pipe is cleaned by compressed air, coating is carried out within 4h, and rust removal is needed when the phenomenon of re-embroidering occurs;
s5: coating construction, wherein zinc spraying has extremely high solid content, so that when in use, an electric or pneumatic tool is used for fully and uniformly stirring the coating, then a special diluent and a curing agent are added according to a certain proportion, and construction is carried out after uniform stirring, and in order to keep the zinc powder in a suspension state, the coating must be kept in a continuous stirring state;
s6: experiment, the pipeline after spraying paint is stood and placed for a period of time, then a plurality of zinc-sprayed pipes are randomly selected for carrying out an anticorrosion experiment, then comparison is carried out, a sample is placed in the same simulation environment for a period of time, then the condition of the surface of the sample is observed, and then the thickness of an anticorrosion layer is measured through instruments respectively.
2. The surface zinc-spraying anticorrosion treatment process for ductile cast iron pipes as claimed in claim 1, wherein during said degreasing process, it is noted that after degreasing with organic solvent, additional degreasing is necessary, because when the solvent volatilizes on the surface of the pipe, a thin film usually remains, which can be removed by alkali cleaning degreasing, electrochemical degreasing, etc. in the following processes.
3. The surface zinc-spraying anti-corrosion treatment process for the ductile cast iron pipe as claimed in claim 1, wherein the surface of the pipe needs to be inspected according to national standard roughness grade in the shot blasting treatment process, the surface needs to reach Sa2.5 grade, and the surface needs to reach Sa3 grade when the pipe is corroded seriously.
4. The surface zinc-spraying anticorrosion treatment process for the nodular cast iron pipe as claimed in claim 1, wherein the coating construction has certain requirements on the environment, in order to ensure the quality of sand spraying, the relative humidity is kept at the best of 40-60%, the temperature of the steel plate is higher than the dew point by 3 ℃, the environmental temperature cannot be lower than 5 ℃ during cold 0 zinc spraying construction, and the maximum temperature cannot exceed 40 ℃.
5. The surface zinc-spraying anti-corrosion treatment process for the nodular cast iron pipe as claimed in claim 1, wherein the construction process requires three spraying times, a first primer, a second sealant and a third finish, wherein the thickness of the primer is 80 μm.
6. The surface zinc-spraying anti-corrosion treatment process for the ductile cast iron pipe as claimed in claim 1, wherein a special cleaning agent is used in the surface treatment process, the surface of the pipe is not contaminated by impurities in the pipe by the special cleaning agent, and the treatment quality is improved.
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