CN114000079A - End face copper-coating process of copper-steel composite reel pipe - Google Patents
End face copper-coating process of copper-steel composite reel pipe Download PDFInfo
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- CN114000079A CN114000079A CN202111289020.1A CN202111289020A CN114000079A CN 114000079 A CN114000079 A CN 114000079A CN 202111289020 A CN202111289020 A CN 202111289020A CN 114000079 A CN114000079 A CN 114000079A
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/38—Wires; Tubes
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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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to the technical field of copper-steel composite reel pipe processing, in particular to an end surface copper-coating process of a copper-steel composite reel pipe, which comprises the following steps: carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment; preheating a part to be coated with copper of the copper-steel composite pipe to 600-1070 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection; under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe; and polishing and grinding the workpiece coated with the copper. The end face copper-clad process disclosed by the invention is low in equipment investment, simple and convenient in process operation, suitable for wide popularization and application, capable of solving the problem that an end face steel base material of a copper-steel composite plate is exposed and easy to rust, and wide in prospect.
Description
Technical Field
The invention relates to the technical field of copper-steel composite reel pipe processing, in particular to an end face copper-coating process of a copper-steel composite reel pipe.
Background
As the reel pipe used as commercial air conditioner accessories and heat pump water heater accessories, pure copper or pure steel materials are generally adopted, wherein the reel pipe made of the pure copper pipe materials is too high in cost, insufficient in rigidity and easy to deform, the pure steel materials are easy to rust, and the welding performance is poor, so that the copper steel composite reel pipe is prepared by adopting low-carbon steel as a base material and compounding the low-carbon steel with copper materials to solve the problems. After the processing is finished, the low-carbon steel base materials on the end faces of the two ends of the copper-iron composite pipe are exposed in the air and are easy to rust, the exposed base materials influence the welding performance of the end face of the coiled pipe, and the problem that the base materials on the two ends are exposed cannot be solved by the pipe fitting product through a stamping and stretching process and a drawing and shrinking process. In the prior art, the conventional method for avoiding rusting is to coat rust preventive oil on the exposed end face of a substrate, but the mode of coating the rust preventive oil needs to be cleaned before use, and meanwhile, the rust preventive oil is easy to remain and influences the welding performance.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the end face copper-coating process for the copper-steel composite reel pipe, the end face copper-coating process has the advantages of less equipment investment, simple and convenient process operation, suitability for wide popularization and application, capability of solving the problem that an end face steel substrate of a copper-steel composite plate is exposed and easy to rust, and wide prospect.
The purpose of the invention is realized by the following technical scheme: an end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) preheating a part to be coated with copper of the copper-steel composite pipe to 600-1070 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas may employ nitrogen or hydrogen. The part to be coated with copper is preheated under the protection of reducing gas, so that the part to be coated with copper is prevented from being oxidized in the preheating process, and the copper coating time of the part to be coated with copper can be greatly shortened by preheating in advance.
According to the invention, the end face of the copper-steel composite reel pipe is coated with copper by adopting the process, so that the antirust capacity of the end face of the copper-steel composite reel pipe can be effectively improved, the copper-steel composite reel pipe is convenient to clean and can be stored for a long time, the fluidity and permeability of a copper solder used in welding on the end face can be improved, the welding performance of the end face of the copper-steel composite reel pipe is improved, the copper-steel composite reel pipe can be directly welded without sleeving other copper pipe connectors in welding, and the phenomenon of falling-off does not occur after the end face is coated with copper after processing and testing, so that the copper-steel composite reel pipe has excellent stability; the end face copper-clad process disclosed by the invention is low in equipment investment, simple and convenient in process operation, suitable for wide popularization and application, capable of solving the problem that an end face steel base material of a copper-steel composite plate is exposed and easy to rust, and wide in prospect.
Wherein, the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) placing the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for soaking for 1 s-1 h, cleaning the copper-steel composite pipe with clean water after rust removal, and then placing the part to be coated with copper in an alkaline reagent for soaking for 1 s-1 h.
The acid solution used by the method can peel and decompose the rusty substance on the surface of the part to be coated with copper, and has high rust removal speed and relatively low cost; the alkaline reagent used by the invention can quickly remove the surface oil stain on the part to be coated with copper, so as to achieve the effect of cleaning the surface and be beneficial to subsequent coating with copper.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 3% -6%, and the alkaline reagent is a sodium hydroxide solution with the mass fraction of 8% -12%.
Wherein, the specific steps of the step (3) are as follows: under the protection of reducing gas, heating and melting a copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered with copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1083-1600 ℃, the ultrasonic frequency is 50-5000 Hz, inserting a preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is less than or equal to 10mm, or only attaching the end face of the workpiece to be clad with copper to the molten copper-clad material, keeping the time for 0.2 s-5 min, and taking out the workpiece and cooling to obtain the copper-clad material which is attached to the part to be clad with copper.
Specifically, the insertion depth of the copper-clad material after the end face of the copper-clad workpiece is only attached to the molten copper-clad material is 0 mm.
According to the invention, the copper-clad material is heated and melted, then heat preservation and ultrasonic treatment are carried out, and the heat preservation temperature and the ultrasonic frequency are strictly controlled, so that the atomic collision of the copper-clad material can be enhanced, the adhesion of the copper-clad material on the part to be clad can be greatly improved, the fusion time of the copper-clad material and the part to be clad of a workpiece can be shortened, and the copper-clad stability can be improved; according to the invention, the copper is coated on the part to be coated with copper through the steps, so that the equipment investment is less, the process operation is simple and convenient, the method is suitable for wide popularization and application, and the prospect is wide.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 0.5-5 mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
By adopting the container with the structure, the workpiece can be conveniently inserted into the copper-clad material for copper cladding, the copper-clad material can be saved, the copper cladding is more uniform, the equipment is simple, the manufacturing cost is low, the process operation is simple and convenient, and the container is suitable for wide popularization and application.
Specifically, the copper-clad material is a pure copper block or a copper-based solder.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping or spraying mode, the coverage rate of the copper powder of the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 600-1050 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
According to the invention, the copper is coated on the part to be coated with copper through the steps, so that the copper-coating stability is high, the equipment investment is less, the process operation is simple and convenient, the copper-coating method is suitable for wide popularization and application, and the prospect is wide.
Wherein, the specific steps of the dipping mode in the step (3) are as follows: and inserting the part to be coated with copper into a container loaded with copper powder for 0.5-60 s.
Wherein, the specific steps of the spraying mode in the step (3) are as follows: spraying copper powder on the part to be coated with copper for 0.5-60 s.
The invention has the beneficial effects that: according to the invention, the end face of the copper-steel composite reel pipe is coated with copper by adopting the process, so that the antirust capacity of the end face of the copper-steel composite reel pipe can be effectively improved, the copper-steel composite reel pipe is convenient to clean and can be stored for a long time, the fluidity and permeability of a copper solder used in welding on the end face can be improved, the welding performance of the end face of the copper-steel composite reel pipe is improved, the copper-steel composite reel pipe can be directly welded without sleeving other copper pipe connectors in welding, and the phenomenon of falling-off does not occur after the end face is coated with copper after processing and testing, so that the copper-steel composite reel pipe has excellent stability; the end face copper-clad process disclosed by the invention is low in equipment investment, simple and convenient in process operation, suitable for wide popularization and application, capable of solving the problem that an end face steel base material of a copper-steel composite plate is exposed and easy to rust, and wide in prospect.
Detailed Description
The present invention will be further described below to facilitate understanding of those skilled in the art, and the embodiments are not to be construed as limiting the present invention.
Example 1
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) preheating the part to be coated with copper of the copper-steel composite pipe to 600 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is nitrogen.
Wherein, the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for 1s, cleaning the copper-steel composite pipe with clean water after rust removal, and soaking the part to be coated with copper in an alkaline reagent for 1 s.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 6%, and the alkaline reagent is a sodium hydroxide solution with the mass fraction of 12%.
Wherein, the specific steps of the step (3) are as follows: and under the protection of reducing gas, heating and melting the copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered to copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1083 ℃, the ultrasonic frequency is 50Hz, inserting the preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is 0.5mm, the holding time is 0.2s, and the copper-clad material is attached to the part to be clad with copper after the workpiece is taken out and cooled.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 0.5mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is a pure copper block.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping mode, the coverage rate of the copper powder on the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 600 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the dipping mode in the step (3) are as follows: the part to be coated with copper was inserted into the copper powder-loaded container for 0.5 s.
Example 2
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) preheating the part to be coated with copper of the copper-steel composite pipe to 800 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is nitrogen.
Wherein, the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for 5s, cleaning the copper-steel composite pipe with clean water after rust removal, and soaking the part to be coated with copper in an alkaline reagent for 5 s.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 5%, and the alkaline reagent is a sodium hydroxide solution with the mass fraction of 10%.
Wherein, the specific steps of the step (3) are as follows: and under the protection of reducing gas, heating and melting the copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered to copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1100 ℃, the ultrasonic frequency is 800Hz, inserting the preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is 2mm, the holding time is 10s, and the copper-clad material is adhered to the part to be clad with copper after the workpiece is taken out and cooled.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 0.7mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is a pure copper block.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping mode, the coverage rate of the copper powder on the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 800 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the dipping mode in the step (3) are as follows: and inserting the part to be coated with copper into the container loaded with copper powder for 5 s.
Example 3
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) preheating the part to be coated with copper of the copper-steel composite pipe to 900 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is nitrogen.
Wherein, the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for 8s, cleaning the copper-steel composite pipe with clean water after rust removal, and soaking the part to be coated with copper in an alkaline reagent for 8 s.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 5%, and the alkaline reagent is a sodium hydroxide solution with the mass fraction of 10%.
Wherein, the specific steps of the step (3) are as follows: and under the protection of reducing gas, heating and melting the copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered to copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1200 ℃, the ultrasonic frequency is 1000Hz, inserting the preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is 3mm, the holding time is 20s, and the copper-clad material is adhered to the part to be clad with copper after the workpiece is taken out and cooled.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 1mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is a pure copper block.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping mode, the coverage rate of the copper powder on the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 900 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the dipping mode in the step (3) are as follows: the part to be coated with copper was inserted into the copper powder-loaded container for 50 seconds.
Example 4
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) preheating the part to be coated with copper of the copper-steel composite pipe to 1000 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is hydrogen.
Wherein, the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for 15s, cleaning the copper-steel composite pipe with clean water after rust removal, and soaking the part to be coated with copper in an alkaline reagent for 15 s.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 5%, and the alkaline reagent is a sodium hydroxide solution with the mass fraction of 10%.
Wherein, the specific steps of the step (3) are as follows: and under the protection of reducing gas, heating and melting the copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered to copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1300 ℃, the ultrasonic frequency is 2500Hz, inserting the preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is 5mm, the holding time is 2min, and the copper-clad material is adhered to the part to be clad with copper after the workpiece is taken out and cooled.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 2mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is a pure copper block.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper in a spraying mode, the coverage rate of the copper powder on the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 1000 ℃ by using a high-frequency welding or electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the spraying mode in the step (3) are as follows: and spraying copper powder on the part to be coated with copper for 1 s.
Example 5
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) preheating the part to be coated with copper of the copper-steel composite pipe to 1070 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is hydrogen.
Wherein, the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for 1h, cleaning the copper-steel composite pipe with clean water after rust removal, and soaking the part to be coated with copper in an alkaline reagent for 1 h.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 3%, and the alkaline reagent is a sodium hydroxide solution with the mass fraction of 8%.
Wherein, the specific steps of the step (3) are as follows: and under the protection of reducing gas, heating and melting the copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered to copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1600 ℃, the ultrasonic frequency is 5000Hz, inserting the preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is 10mm, the holding time is 5min, and the copper-clad material is adhered to the part to be clad with copper after the workpiece is taken out and cooled.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 5mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is copper-based solder.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper in a spraying mode, the coverage rate of the copper powder of the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 1050 ℃ by using high-frequency welding or an electric furnace in the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the spraying mode in the step (3) are as follows: and spraying copper powder on the part to be coated with copper for 60 s.
Comparative example 1
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) degreasing the copper-steel composite pipe to be coated with copper, and cleaning the copper to be coated with copper by using clear water after degreasing;
(2) preheating the part to be coated with copper of the copper-steel composite pipe to 900 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is nitrogen.
Wherein the oil stain removal treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with the copper of the copper-steel composite pipe in an alkaline reagent for 8 s.
Specifically, the alkaline reagent is a sodium hydroxide solution with the mass fraction of 10%.
Wherein, the specific steps of the step (3) are as follows: and under the protection of reducing gas, heating and melting the copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered to copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1200 ℃, the ultrasonic frequency is 1000Hz, inserting the preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is 3mm, the holding time is 20s, and the copper-clad material is adhered to the part to be clad with copper after the workpiece is taken out and cooled.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 1mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is a pure copper block.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping mode, the coverage rate of the copper powder on the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 900 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the dipping mode in the step (3) are as follows: the part to be coated with copper was inserted into the copper powder-loaded container for 50 seconds.
Comparative example 2
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(5) carrying out rust removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust removal treatment;
(1) preheating the part to be coated with copper of the copper-steel composite pipe to 900 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(2) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(3) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is nitrogen.
Wherein, the rust removing treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with the copper of the copper-steel composite pipe in an acid reagent for 8 s.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 5%.
Wherein, the specific steps of the step (3) are as follows: and under the protection of reducing gas, heating and melting the copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered to copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1200 ℃, the ultrasonic frequency is 1000Hz, inserting the preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is 3mm, the holding time is 20s, and the copper-clad material is adhered to the part to be clad with copper after the workpiece is taken out and cooled.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 1mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is a pure copper block.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping mode, the coverage rate of the copper powder on the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 900 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the dipping mode in the step (3) are as follows: the part to be coated with copper was inserted into the copper powder-loaded container for 50 seconds.
Comparative example 3
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(3) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is nitrogen.
Wherein, the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for 8s, cleaning the copper-steel composite pipe with clean water after rust removal, and soaking the part to be coated with copper in an alkaline reagent for 8 s.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 5%, and the alkaline reagent is a sodium hydroxide solution with the mass fraction of 10%.
Wherein, the specific steps of the step (2) are as follows: and under the protection of reducing gas, heating and melting the copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered to copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1200 ℃, the ultrasonic frequency is 1000Hz, inserting the workpiece to be clad with copper into the molten copper-clad material, the insertion depth is 3mm, the holding time is 20s, and the workpiece is taken out and cooled, so that the copper-clad material is adhered to the part to be clad with copper.
The container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 1mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is a pure copper block.
Wherein, the specific steps of the step (2) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping mode, the coverage rate of the copper powder on the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 900 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the dipping mode in the step (2) are as follows: the part to be coated with copper was inserted into the copper powder-loaded container for 50 seconds.
Comparative example 4
An end face copper-clad process of a copper-steel composite reel pipe comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) preheating the part to be coated with copper of the copper-steel composite pipe to 900 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
Specifically, the reducing gas is nitrogen.
Wherein, the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) soaking the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for 8s, cleaning the copper-steel composite pipe with clean water after rust removal, and soaking the part to be coated with copper in an alkaline reagent for 8 s.
Specifically, the acidic reagent is a hydrochloric acid solution with the mass fraction of 5%, and the alkaline reagent is a sodium hydroxide solution with the mass fraction of 10%.
Wherein, the specific steps of the step (3) are as follows: and under the environment of reducing gas protection, heating and melting the copper-clad material, pouring the copper-clad material into a heat-resistant container which is not adhered with copper, inserting the preheated workpiece to be coated with copper into the melted copper-clad material, wherein the insertion depth is 3mm, the holding time is 20s, and the workpiece is taken out and cooled, so that the copper-clad material is adhered to the part to be coated with copper.
The container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the width of the containing groove is 1mm larger than the thickness of the pipe wall of the copper-steel composite pipe to be clad with copper.
Specifically, the copper-clad material is a pure copper block.
Wherein, the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping mode, the coverage rate of the copper powder on the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 900 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
Wherein, the specific steps of the dipping mode in the step (3) are as follows: the part to be coated with copper was inserted into the copper powder-loaded container for 50 seconds.
Copper is respectively coated on the end faces of the copper-steel composite reel pipes by the processes of the examples 1-5 and the comparative examples 1-4, and the performance of the copper-coated part of the copper-steel composite reel pipe is as follows:
finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. An end face copper-clad process of a copper-steel composite reel pipe is characterized in that: the method comprises the following steps:
(1) carrying out rust and oil stain removal treatment on a part to be coated with copper of the copper-steel composite pipe, and cleaning the part to be coated with copper by using clear water after the rust and oil stain removal treatment;
(2) preheating a part to be coated with copper of the copper-steel composite pipe to 600-1070 ℃ by using high-frequency welding or electric furnace heating in the environment of reducing gas protection;
(3) under the protection of reducing gas, melting the copper-clad material and attaching the copper-clad material to a part to be clad with copper of the copper-steel composite pipe;
(4) and polishing and grinding the workpiece coated with the copper.
2. The end face copper-clad process of the copper-steel composite reel pipe according to claim 1, characterized in that: the rust and oil removing treatment in the step (1) comprises the following specific steps: and (3) placing the part to be coated with copper of the copper-steel composite pipe in an acidic reagent for soaking for 1 s-1 h, cleaning the copper-steel composite pipe with clean water after rust removal, and then placing the part to be coated with copper in an alkaline reagent for soaking for 1 s-1 h.
3. The end face copper-clad process of the copper-steel composite reel pipe according to claim 1, characterized in that: the specific steps of the step (3) are as follows: under the protection of reducing gas, heating and melting a copper-clad material, pouring the molten copper-clad material into a heat-resistant container which is not adhered with copper, carrying out heat preservation and ultrasonic treatment, wherein the heat preservation temperature is 1083-1600 ℃, the ultrasonic frequency is 50-5000 Hz, inserting a preheated workpiece to be clad with copper into the molten copper-clad material, the insertion depth is less than or equal to 10mm, or only attaching the end face of the workpiece to the molten copper-clad material, keeping the time for 0.2 s-5 min, and taking out the workpiece and cooling, so that the copper-clad material is attached to the part to be clad with copper.
4. The end face copper-clad process of the copper-steel composite reel pipe according to claim 3, characterized in that: the container is a heat-insulating crucible or a ceramic container, the container is an annular container, the annular container is provided with a containing groove for containing the melted copper-clad material, and the groove width of the containing groove is 0.5-5 mm larger than the pipe wall thickness of the copper-steel composite pipe to be clad with copper.
5. The end face copper-clad process of the copper-steel composite reel pipe according to claim 1, characterized in that: the specific steps of the step (3) are as follows: the copper powder is adhered to the part to be coated with the copper by using a dipping or spraying mode, the coverage rate of the copper powder of the part to be coated with the copper is more than 60%, the part to be coated with the copper is heated to 600-1050 ℃ by using high-frequency welding or an electric furnace under the environment of reducing gas protection, or the part to be coated with the copper is heated by using flame brazing, the copper powder adhered to the part to be coated with the copper is melted, and the cooled copper forms a copper layer on the part to be coated with the copper.
6. The end face copper-clad process of the copper-steel composite reel pipe according to claim 5, characterized in that: the dipping method in the step (3) comprises the following specific steps: and inserting the part to be coated with copper into a container loaded with copper powder for 0.5-60 s.
7. The end face copper-clad process of the copper-steel composite reel pipe according to claim 5, characterized in that: the specific steps of the spraying mode in the step (3) are as follows: spraying copper powder on the part to be coated with copper for 0.5-60 s.
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