CN111962016A - Preparation method of steel lamp pole - Google Patents
Preparation method of steel lamp pole Download PDFInfo
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- CN111962016A CN111962016A CN202010912564.8A CN202010912564A CN111962016A CN 111962016 A CN111962016 A CN 111962016A CN 202010912564 A CN202010912564 A CN 202010912564A CN 111962016 A CN111962016 A CN 111962016A
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention relates to the technical field of lamp post preparation methods, in particular to a preparation method of a steel lamp post, which comprises the following processing steps: (1) a surface cleaning treatment process; (2) a preheating process; (3) a gas co-permeation process; (4) a cooling process; (5) spraying plastics; and after plastic spraying, air-cooling the steel lamp pole sample to room temperature to obtain a finished steel lamp pole product with an anticorrosive surface. The steel lamp pole manufactured by the invention can realize surface cleaning and activation treatment without acid pickling treatment, no waste liquid discharge is generated, no three-waste discharge is generated in the whole production process, and the steel lamp pole is green and environment-friendly; the production can be carried out in a developed continuous production line, the production process is easy to operate, and the cost is low; the prepared steel lamp pole is detected through a 500-hour neutral salt spray corrosion experiment, corrosion does not occur, corrosion resistance is high, and meanwhile, the surface treatment layer has high hardness and wear resistance, so that surface damage caused by collision and friction in the transportation and installation processes can be avoided.
Description
Technical Field
The invention relates to the technical field of lamp post manufacturing methods, in particular to a manufacturing method of a steel lamp post.
Background
The steel lamp pole is one of the important products widely applied to municipal engineering, and the main production method at present is to roll low-carbon steel plates into various shapes and then weld the shapes. The molded steel lamp post comprises other steel products including a signal tower, an electric power tower, a signal lamp, a traffic guardrail, a traffic sign board and the like, and the surface anticorrosion treatment is required, wherein the anticorrosion treatment process is hot-dip galvanizing and plastic spraying composite treatment, and the service life is required to be 20-30 years.
The main problems existing at present are: before the steel lamp pole carries out surface anticorrosion treatment, the surface all has more rust and oxide skin or a small amount of greasy dirt etc. this can seriously influence surface anticorrosion treatment's effect. Therefore, when hot dip galvanizing is carried out, pickling treatment needs to be carried out on the steel lamp pole, a large amount of waste liquid is generated, the waste liquid needs to be treated and discharged, and the environment is seriously polluted. Meanwhile, plating assistant treatment is needed before hot-dip galvanizing, harmful smoke and dust are generated during galvanizing, and the environment is also polluted; during hot dip galvanizing, harmful substances to human bodies such as zinc vapor and zinc oxide dust are also generated. Meanwhile, the surface of a sample after hot dip galvanizing is uneven, and plastic spraying treatment is carried out after polishing, so that the cost is increased; the abraded part of the zinc coating is easy to rust. In addition, the galvanized layer is not resistant to acid rain and marine corrosion, and the binding force of the surface plastic spraying layer can be seriously influenced after the galvanized layer is corroded, so that the plastic spraying layer is easy to fall off.
Based on the above problems, a new anti-corrosion technology replacing the galvanization process is needed to prepare a new steel lamp post.
Disclosure of Invention
The invention provides a preparation method of a steel lamp post to solve the problems, and aims to solve the problems that the steel lamp post generates sealwort pollution in the surface anticorrosion treatment process and the like. The method does not need acid washing for surface cleaning and activating treatment, does not discharge three wastes in the production process, and is green and environment-friendly; the production is carried out in a developed continuous production line, the operation is easy, and the cost is low; the corrosion resistance is excellent.
The purpose of the invention can be realized by the following technical scheme: a preparation method of a steel lamp post comprises the following processing steps:
(1) surface cleaning treatment process: blanking a low-carbon steel plate, then cleaning the surface of the blanked steel plate to remove dust and rust on the surface of the steel plate, wherein the treatment condition is a closed space, compressed air with the pressure of 1-2 MPa is used for rolling and welding the cleaned plate to obtain a steel lamp pole sample, and meanwhile, the dust and the rust generated in the cleaning treatment process are recycled;
(2) preheating: putting the steel lamp pole sample obtained in the step (1) into a preheating furnace for nitrogen protection preheating treatment, wherein the atmosphere pressure in the furnace is kept at positive pressure of 0.01-0.02 MPa, the preheating treatment temperature is 500-600 ℃, and the preheating time is 1 hour;
(3) and (3) gas co-permeation process: directly feeding the steel lamp post sample subjected to the preheating treatment in the step (2) into a 650-680 ℃ gas co-permeation furnace, performing co-permeation for 1-1.5 hours, wherein the atmosphere in the co-permeation furnace is a mixed gas of ammonia gas, air and an additive, and the air pressure in the co-permeation furnace is always kept at positive pressure of 0.018-0.022 MPa;
(4) and (3) cooling: putting the steel lamp pole sample treated in the step (3) into a cooling chamber protected by nitrogen for cooling treatment, keeping the nitrogen pressure in the cooling chamber at positive pressure of 0.01-0.02 Mpa, and cooling the steel lamp pole sample to 200-220 ℃;
(5) and (3) a plastic spraying process: and (3) moving the steel lamp pole sample obtained in the step (4) into a plastic spraying chamber, sealing the plastic spraying chamber, carrying out surface plastic spraying treatment by using the waste heat of the steel lamp pole sample, controlling the thickness of the plastic spraying layer to be 50-100 micrometers, and air-cooling the steel lamp pole sample to room temperature after plastic spraying, thus obtaining a steel lamp pole finished product with an anticorrosive surface.
Further, the volume ratio of the ammonia gas, the air and the additive in the step (3) is 12: 1: 2.
further, the atomic ratio of C, H, O, N in the additive is 10: 20: 5: 3.
further, the additive is a mixture of methanol, acetone, triethanolamine and ammonia water.
Further, in the step (3), the air pressure in the co-permeation furnace is always kept at the positive pressure of 0.02 MPa.
Further, in the step (3), the ammonia gas is directly introduced into a co-permeation furnace, and the air and the additive are preheated at 100-120 ℃ and then introduced into the co-permeation furnace.
Further, the steel lamp pole sample in the step (4) is cooled to 200 ℃.
Further, the thickness of a compound layer in a surface permeation layer of the finished product of the steel lamp post is 30-50 micrometers, the thickness of a total permeation layer is 0.1-0.2 millimeter, and the thickness of a plastic spraying layer is 50-100 micrometers.
The invention has the beneficial effects that:
1. the steel lamp pole manufactured by the invention can realize surface cleaning and activation treatment without acid pickling treatment, does not generate a large amount of waste liquid, does not generate three-waste discharge in the whole production process, and is more environment-friendly;
2. the invention can be produced in a developed continuous production line, is convenient to operate and has low cost;
3. the finished product of the steel lamp post prepared by the invention can pass a neutral salt spray corrosion actual experiment for 500 hours, is not rusted and has strong corrosion resistance.
Description of the drawings:
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 shows the microscopic appearance of the surface anticorrosion treatment layer of the finished steel lamp post product manufactured by the invention.
Detailed Description
The technical solution of the present invention will be further illustrated and described below with reference to the accompanying drawings by means of specific embodiments.
Example 1
A treatment method for corrosion prevention of the surface of a steel lamp post sample comprises the following treatment steps:
(1) surface cleaning treatment process: blanking a low-carbon steel plate, then cleaning the surface of the blanked steel plate to remove dust and floating rust on the surface of the steel plate, wherein the treatment condition is a closed space, compressed air with the pressure of 1MPa is used for rolling and welding the cleaned plate to obtain a steel lamp pole sample, and meanwhile, dust and floating rust generated in the cleaning treatment process are recycled and then mixed with asphalt for paving, so that the environmental pollution and the discharge of solid wastes are avoided;
(2) preheating: putting the steel lamp pole sample obtained in the step (1) into a preheating furnace for nitrogen protection preheating treatment, wherein the atmosphere pressure in the furnace is kept at positive pressure of 0.01MPa, the preheating treatment temperature is 500 ℃, and the preheating treatment time is 1 hour;
(3) and (3) gas co-permeation process: directly feeding the steel lamp post sample subjected to preheating treatment in the step (2) into a gas co-permeation furnace at 680 ℃, co-permeating for 1 hour, wherein the atmosphere in the co-permeation furnace mainly comprises ammonia gas, air and an additive, and the volume ratio of the ammonia gas to the air to the additive is 12: 1: 2, the atomic ratio of C, H, O, N in the additive is 10: 20: 5: 3, methanol, acetone, triethanolamine and ammonia water can be selected. When the device is used, ammonia gas is directly introduced into the co-permeation furnace in proportion, then air and additives are preheated at 100 ℃ and then introduced into the co-permeation furnace in proportion, the total amount of gas introduced into the co-permeation furnace can be controlled by the instantaneous gas pressure in the furnace, and the gas pressure in the co-permeation furnace is always kept at the positive pressure of 0.02 MPa.
(4) And (3) cooling: putting the steel lamp pole sample treated in the step (3) into a cooling chamber protected by nitrogen for cooling treatment, keeping the nitrogen pressure in the cooling chamber at positive pressure of 0.02Mpa, and cooling the steel lamp pole sample to 200 ℃;
(5) and (3) a plastic spraying process: and (4) moving the steel lamp pole sample obtained in the step (4) into a plastic spraying chamber, sealing the plastic spraying chamber, carrying out surface plastic spraying treatment by using the waste heat of the steel lamp pole sample, controlling the thickness of the plastic spraying layer to be 50 microns, and air-cooling the steel lamp pole sample to room temperature after plastic spraying to obtain a steel lamp pole finished product with an anticorrosive surface.
The thickness of a compound layer in the surface permeable layer of the steel lamp post prepared by the invention is 50 microns, the thickness of the total permeable layer is 0.15 mm, and the thickness of the plastic spraying layer is 50 microns. The corrosion can be avoided and the corrosion resistance is strong through a neutral salt spray corrosion actual experiment for 500 hours.
Example 2
A treatment method for corrosion prevention of the surface of a steel lamp post sample comprises the following treatment steps:
(1) surface cleaning treatment process: blanking a low-carbon steel plate, then carrying out surface cleaning treatment on the blanked steel plate to remove dust and floating rust on the surface of the steel plate, wherein the treatment condition is a closed space, compressed air with the pressure of 1.5MPa is used for rolling and welding the cleaned plate to obtain a steel lamp pole sample, and meanwhile, dust and floating rust generated in the cleaning treatment process are recycled and then mixed with asphalt for paving, so that the environmental pollution and the discharge of solid wastes are avoided;
(2) preheating: putting the steel lamp pole sample obtained in the step (1) into a preheating furnace for nitrogen protection preheating treatment, wherein the atmosphere pressure in the furnace is kept at positive pressure of 0.02MPa, the preheating treatment temperature is 575 ℃, and the preheating treatment time is 1 hour;
(3) and (3) gas co-permeation process: directly feeding the steel lamp post sample subjected to preheating treatment in the step (2) into a gas co-permeation furnace at 670 ℃, co-permeating for 1.5 hours, wherein the atmosphere in the co-permeation furnace mainly comprises ammonia gas, air and an additive, and the volume ratio of the ammonia gas to the air to the additive is 12: 1: 2, the atomic ratio of C, H, O, N in the additive is 10: 20: 5: 3, methanol, acetone, triethanolamine and ammonia water can be selected. When in use, ammonia gas is directly introduced into the co-permeation furnace in proportion, then air and an additive are preheated at 110 ℃ and then introduced into the co-permeation furnace in proportion, the total amount of the gas introduced into the co-permeation furnace can be controlled by the instantaneous gas pressure in the furnace, and the gas pressure in the co-permeation furnace is always kept at the positive pressure of 0.02 Mpa;
(4) and (3) cooling: putting the steel lamp pole sample treated in the step (3) into a cooling chamber protected by nitrogen for cooling treatment, keeping the nitrogen pressure in the cooling chamber at positive pressure of 0.015Mpa, and cooling the steel lamp pole sample to 200 ℃;
(5) and (3) a plastic spraying process: and (4) moving the steel lamp pole sample obtained in the step (4) into a plastic spraying chamber, sealing the plastic spraying chamber, carrying out surface plastic spraying treatment by using the waste heat of the steel lamp pole sample, controlling the thickness of the plastic spraying layer to be 80 microns, and air-cooling the steel lamp pole sample to room temperature after plastic spraying to obtain a steel lamp pole finished product with an anticorrosive surface.
The thickness of a compound layer in the surface permeable layer of the steel lamp post prepared by the invention is 45 micrometers, the thickness of the total permeable layer is 0.2 millimeter, and the thickness of the plastic spraying layer is 80 micrometers. The corrosion can be avoided and the corrosion resistance is strong through a neutral salt spray corrosion actual experiment for 500 hours.
Example 3
A treatment method for corrosion prevention of the surface of a steel lamp post sample comprises the following treatment steps:
(1) surface cleaning treatment process: blanking a low-carbon steel plate, then cleaning the surface of the blanked steel plate to remove dust and floating rust on the surface of the steel plate, wherein the treatment condition is a closed space, compressed air with the pressure of 2MPa is used for rolling and welding the cleaned plate to obtain a steel lamp pole sample, and meanwhile, dust and floating rust generated in the cleaning treatment process are recycled and then mixed with asphalt for paving, so that the environmental pollution and the discharge of solid wastes are avoided;
(2) preheating: putting the steel lamp pole sample obtained in the step (1) into a preheating furnace for nitrogen protection preheating treatment, wherein the atmosphere pressure in the furnace is kept at positive pressure of 0.02MPa, the preheating treatment temperature is 500 ℃, and the preheating treatment time is 1 hour;
(3) and (3) gas co-permeation process: directly feeding the steel lamp post sample subjected to the preheating treatment in the step (2) into a 650 ℃ gas co-permeation furnace, carrying out co-permeation for 1 hour, wherein the atmosphere in the co-permeation furnace mainly comprises ammonia gas, air and an additive, and the volume ratio of the ammonia gas to the air to the additive is 12: 1: 2, the atomic ratio of C, H, O, N in the additive is 10: 20: 5: 3, methanol, acetone, triethanolamine and ammonia water can be selected. When in use, ammonia gas is directly introduced into the co-permeation furnace in proportion, then air and an additive are preheated at 120 ℃ and then introduced into the co-permeation furnace in proportion, the total amount of the gas introduced into the co-permeation furnace can be controlled by the instantaneous gas pressure in the furnace, and the gas pressure in the co-permeation furnace is always kept at the positive pressure of 0.02 Mpa;
(4) and (3) cooling: putting the steel lamp pole sample treated in the step (3) into a cooling chamber protected by nitrogen for cooling treatment, keeping the nitrogen pressure in the cooling chamber at positive pressure of 0.01Mpa, and cooling the steel lamp pole sample to 200 ℃;
(5) and (3) a plastic spraying process: and (4) moving the steel lamp pole sample obtained in the step (4) into a plastic spraying chamber, sealing the plastic spraying chamber, carrying out surface plastic spraying treatment by using the waste heat of the steel lamp pole sample, controlling the thickness of the plastic spraying layer to be 100 microns, and air-cooling the steel lamp pole sample to room temperature after plastic spraying to obtain a steel lamp pole finished product with an anticorrosive surface.
The thickness of a compound layer in the surface permeable layer of the steel lamp post prepared by the invention is 30 micrometers, the thickness of the total permeable layer is 0.1 millimeter, and the thickness of the plastic spraying layer is 100 micrometers. The corrosion can be avoided and the corrosion resistance is strong through a neutral salt spray corrosion actual experiment for 500 hours.
Example 4
A treatment method for corrosion prevention of the surface of a steel lamp post sample comprises the following treatment steps:
(1) surface cleaning treatment process: blanking a low-carbon steel plate, then cleaning the surface of the blanked steel plate to remove dust and floating rust on the surface of the steel plate, wherein the treatment condition is a closed space, compressed air with the pressure of 1MPa is used for rolling and welding the cleaned plate to obtain a steel lamp pole sample, and meanwhile, dust and floating rust generated in the cleaning treatment process are recycled and then mixed with asphalt for paving, so that the environmental pollution and the discharge of solid wastes are avoided;
(2) preheating: putting the steel lamp pole sample obtained in the step (1) into a preheating furnace for nitrogen protection preheating treatment, wherein the atmosphere pressure in the furnace is kept at positive pressure of 0.01MPa, the preheating treatment temperature is 500 ℃, and the preheating treatment time is 1 hour;
(3) and (3) gas co-permeation process: directly feeding the steel lamp post sample subjected to the preheating treatment in the step (2) into a gas co-permeation furnace at 680 ℃, co-permeating for 1.5 hours, wherein the atmosphere in the co-permeation furnace mainly comprises ammonia gas, air and an additive, and the volume ratio of the ammonia gas to the air to the additive is 12: 1: 2, the atomic ratio of C, H, O, N in the additive is 10: 20: 5: 3, methanol, acetone, triethanolamine and ammonia water can be selected. When the device is used, ammonia gas is directly introduced into the co-permeation furnace in proportion, then air and additives are preheated at 120 ℃ and then introduced into the co-permeation furnace in proportion, the total amount of gas introduced into the co-permeation furnace can be controlled by the instantaneous gas pressure in the furnace, and the gas pressure in the co-permeation furnace is always kept at the positive pressure of 0.02 MPa.
(4) And (3) cooling: putting the steel lamp pole sample treated in the step (3) into a cooling chamber protected by nitrogen for cooling treatment, keeping the nitrogen pressure in the cooling chamber at positive pressure of 0.02Mpa, and cooling the steel lamp pole sample to 200 ℃;
(5) and (3) a plastic spraying process: and (4) moving the steel lamp pole sample obtained in the step (4) into a plastic spraying chamber, sealing the plastic spraying chamber, carrying out surface plastic spraying treatment by using the waste heat of the steel lamp pole sample, controlling the thickness of the plastic spraying layer to be 50 microns, and air-cooling the steel lamp pole sample to room temperature after plastic spraying to obtain a steel lamp pole finished product with an anticorrosive surface.
The thickness of a compound layer in the surface permeable layer of the steel lamp post prepared by the invention is 50 microns, the thickness of the total permeable layer is 0.2 mm, and the thickness of the plastic spraying layer is 50 microns. The corrosion can be avoided and the corrosion resistance is strong through a neutral salt spray corrosion actual experiment for 500 hours.
Example 5
A treatment method for corrosion prevention of the surface of a steel lamp post sample comprises the following treatment steps:
(1) surface cleaning treatment process: blanking a low-carbon steel plate, then carrying out surface cleaning treatment on the blanked steel plate to remove dust and floating rust on the surface of the steel plate, wherein the treatment condition is a closed space, compressed air with the pressure of 1.5MPa is used for rolling and welding the cleaned plate to obtain a steel lamp pole sample, and meanwhile, dust and floating rust generated in the cleaning treatment process are recycled and then mixed with asphalt for paving, so that the environmental pollution and the discharge of solid wastes are avoided;
(2) preheating: putting the steel lamp pole sample obtained in the step (1) into a preheating furnace for nitrogen protection preheating treatment, wherein the atmosphere pressure in the furnace is kept at positive pressure of 0.018MPa, the preheating treatment temperature is 600 ℃, and the preheating treatment time is 1 hour;
(3) and (3) gas co-permeation process: directly putting the steel lamp post sample subjected to the preheating treatment in the step (2) into a 675 ℃ gas co-permeation furnace, carrying out co-permeation for 1.2 hours, wherein the atmosphere in the co-permeation furnace mainly comprises ammonia gas, air and an additive, and the volume ratio of the ammonia gas to the air to the additive is 12: 1: 2, the atomic ratio of C, H, O, N in the additive is 10: 20: 5: 3, methanol, acetone, triethanolamine and ammonia water can be selected. When the device is used, ammonia gas is directly introduced into the co-permeation furnace in proportion, then air and additives are preheated at 110 ℃ and then introduced into the co-permeation furnace in proportion, the total amount of gas introduced into the co-permeation furnace can be controlled by the instantaneous gas pressure in the furnace, and the gas pressure in the co-permeation furnace is always kept at the positive pressure of 0.02 MPa.
(4) And (3) cooling: putting the steel lamp pole sample treated in the step (3) into a cooling chamber protected by nitrogen for cooling treatment, keeping the nitrogen pressure in the cooling chamber at positive pressure of 0.015Mpa, and cooling the steel lamp pole sample to 200 ℃;
(5) and (3) a plastic spraying process: and (4) moving the steel lamp pole sample obtained in the step (4) into a plastic spraying chamber, sealing the plastic spraying chamber, carrying out surface plastic spraying treatment by using the waste heat of the steel lamp pole sample, controlling the thickness of the plastic spraying layer to be 75 micrometers, and air-cooling the steel lamp pole sample to room temperature after plastic spraying to obtain a steel lamp pole finished product with an anticorrosive surface.
The thickness of a compound layer in the surface permeable layer of the steel lamp post prepared by the invention is 40 micrometers, the thickness of the total permeable layer is 0.17 millimeter, and the thickness of the plastic spraying layer is 75 micrometers. The corrosion can be avoided and the corrosion resistance is strong through a neutral salt spray corrosion actual experiment for 500 hours.
In a word, the steel lamp pole manufactured by the invention can realize surface cleaning and activation treatment without acid washing treatment, no waste liquid discharge is generated, no three-waste discharge is generated in the whole production process, and the production process is green and environment-friendly; the method can be used for continuous production in a developed continuous production line, the production process is easy to operate, and the cost is low; the prepared steel lamp pole product is detected through a 500-hour neutral salt spray corrosion experiment, corrosion does not occur, corrosion resistance is high, and meanwhile, the surface treatment layer has high hardness and wear resistance, so that surface damage caused by collision and friction in the transportation and installation processes can be avoided.
In summary, the present invention is only a preferred embodiment, and not intended to limit the scope of the invention, and all equivalent changes and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.
Claims (8)
1. A preparation method of a steel lamp post is characterized by comprising the following steps:
the method comprises the following processing steps:
(1) surface cleaning treatment process: blanking a low-carbon steel plate, then cleaning the surface of the blanked steel plate to remove dust and rust on the surface of the steel plate, wherein the treatment condition is a closed space, compressed air with the pressure of 1-2 MPa is used for rolling and welding the cleaned plate to obtain a steel lamp pole sample, and meanwhile, the dust and the rust generated in the cleaning treatment process are recycled;
(2) preheating: putting the steel lamp pole sample obtained in the step (1) into a preheating furnace for nitrogen protection preheating treatment, wherein the atmosphere pressure in the furnace is kept at positive pressure of 0.01-0.02 MPa, the preheating treatment temperature is 500-600 ℃, and the preheating treatment time is 1 hour;
(3) and (3) gas co-permeation process: directly feeding the steel lamp post sample subjected to the preheating treatment in the step (2) into a 650-680 ℃ gas co-permeation furnace, performing co-permeation for 1-1.5 hours, wherein the atmosphere in the co-permeation furnace is a mixed gas of ammonia gas, air and an additive, and the air pressure in the co-permeation furnace is always kept at positive pressure of 0.018-0.022 MPa;
(4) and (3) cooling: putting the steel lamp pole sample treated in the step (3) into a cooling chamber protected by nitrogen for cooling treatment, keeping the nitrogen pressure in the cooling chamber at positive pressure of 0.01-0.02 Mpa, and cooling the steel lamp pole sample to 200-220 ℃;
(5) and (3) a plastic spraying process: and (3) moving the steel lamp pole sample obtained in the step (4) into a plastic spraying chamber, sealing the plastic spraying chamber, carrying out surface plastic spraying treatment by using the waste heat of the steel lamp pole sample, controlling the thickness of the plastic spraying layer to be 50-100 micrometers, and air-cooling the steel lamp pole sample to room temperature after plastic spraying, thus obtaining a steel lamp pole finished product with an anticorrosive surface.
2. The method for manufacturing a steel lamp post according to claim 1, wherein the method comprises the following steps: the volume ratio of the ammonia gas, the air and the additive in the step (3) is 12: 1: 2.
3. the method for manufacturing a steel lamp post according to claim 2, wherein the method comprises the following steps: the atomic ratio of C, H, O, N in the additive is 10: 20: 5: 3.
4. the method for manufacturing a steel lamp post according to claim 3, wherein the method comprises the following steps: the additive is a mixture of methanol, acetone, triethanolamine and ammonia water.
5. The method for manufacturing a steel lamp post according to claim 1, wherein the method comprises the following steps: and (3) keeping the air pressure in the co-permeation furnace at positive pressure of 0.02MPa all the time.
6. The method for manufacturing a steel lamp post according to claim 1, wherein the method comprises the following steps: and (3) directly introducing the ammonia gas into a co-permeation furnace, and introducing the air and the additive into the co-permeation furnace after preheating at 100-120 ℃.
7. The method for manufacturing a steel lamp post according to claim 1, wherein the method comprises the following steps: and (4) cooling the steel lamp pole sample to 200 ℃.
8. The method for manufacturing a steel lamp post according to claim 1, wherein the method comprises the following steps: the thickness of a compound layer in the surface permeation layer of the finished product of the steel lamp post is 30-50 micrometers, the thickness of the total permeation layer is 0.1-0.2 millimeter, and the thickness of the plastic spraying layer is 50-100 micrometers.
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