CN114607839A - Multilayer composite metal pipe based on cathodic protection and preparation method thereof - Google Patents
Multilayer composite metal pipe based on cathodic protection and preparation method thereof Download PDFInfo
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- CN114607839A CN114607839A CN202210177067.7A CN202210177067A CN114607839A CN 114607839 A CN114607839 A CN 114607839A CN 202210177067 A CN202210177067 A CN 202210177067A CN 114607839 A CN114607839 A CN 114607839A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 214
- 239000002184 metal Substances 0.000 title claims abstract description 214
- 239000002131 composite material Substances 0.000 title claims abstract description 52
- 238000004210 cathodic protection Methods 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 238000005260 corrosion Methods 0.000 claims abstract description 152
- 230000007797 corrosion Effects 0.000 claims abstract description 147
- 239000010953 base metal Substances 0.000 claims abstract description 105
- 239000010410 layer Substances 0.000 claims abstract description 91
- 239000002344 surface layer Substances 0.000 claims abstract description 48
- 239000003292 glue Substances 0.000 claims abstract description 22
- 238000001125 extrusion Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 238000001192 hot extrusion Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 39
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000013329 compounding Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 230000033116 oxidation-reduction process Effects 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 229910052728 basic metal Inorganic materials 0.000 abstract description 13
- 150000003818 basic metals Chemical class 0.000 abstract description 13
- 230000000694 effects Effects 0.000 description 5
- 239000007769 metal material Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000013064 chemical raw material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 238000005504 petroleum refining Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007799 dermal corrosion Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- 231100000108 skin corrosion Toxicity 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a multilayer composite metal pipe based on cathodic protection and a preparation method thereof, wherein the multilayer composite metal pipe comprises a base metal pipe, a surface layer corrosion-resistant metal pipe and an inner layer corrosion-resistant metal pipe; filling metal glue with sealing and bonding functions in an annular space between the base metal pipe and the surface corrosion-resistant metal pipe; metal glue with sealing and bonding functions is filled in an annular space between the base metal pipe and the inner layer corrosion-resistant metal pipe; the surface layer corrosion-resistant metal pipe is physically compounded with the base metal pipe through hot extrusion deformation of an extrusion head; the inner layer corrosion-resistant metal pipe is physically compounded with the base metal pipe through cold reaming of the reamer; the wall thickness ratio of the base metal pipe to the surface layer corrosion-resistant metal pipe is 3-4. The wall thickness ratio of the basic metal pipe to the inner layer corrosion-resistant metal pipe is more than 4.5, and the corrosion-resistant metal layers are formed on the inner surface and the outer surface of the basic metal pipe, so that the overall corrosion resistance of the composite pipe is effectively improved, and the service life and the safety of the composite pipe are improved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of structures and manufacturing of pipelines with anticorrosive outer surfaces, which are used in oil and gas exploration and development, oil and gas pipeline transportation, petrochemical industry and the like, in particular to a multilayer composite metal pipe based on cathodic protection and a preparation method thereof.
[ background of the invention ]
In pipeline transportation of petroleum and natural gas and petroleum refining and chemical raw material production enterprises, a large number of pipelines operate in an environment with corrosive media for a long time. Meanwhile, the pipeline is exposed to humid air with corrosive media or stratum for a long time, as a result, the inner surface and the outer surface of the pipeline are seriously corroded, the use safety and the service life of the pipeline are directly influenced, and in case of serious accidents caused by pipeline leakage, material loss and environmental pollution are caused, and even serious consequences of casualties occur. Currently, the whole pipeline is compounded by adopting a corrosion-resistant metal material lining or an anti-corrosion coating is coated on the outer surface of the pipeline, which is an effective means for solving the problem of corrosion resistance. The compound mode of inside lining mainly adopts water pressure and the mode of explosion, and water pressure is compound to the sealed requirement of body height, and the explosion mode requires highly to the manufacturing enterprise, especially to the management and control of explosive. And the anticorrosive coating coated on the outer surface of the pipeline is easy to age and crack and has short aging. If the whole pipeline is made of corrosion-resistant metal materials, the production and operation cost of the pipeline is greatly increased.
Accordingly, there is a need to address the deficiencies of the prior art in order to address or mitigate one or more of the problems identified above.
[ summary of the invention ]
In view of the above, the invention provides a multilayer composite metal pipe based on cathodic protection and a preparation method thereof, wherein a layer of metal pipe with stronger corrosion resistance and oxidation resistance than a basic pipeline is compounded on the inner surface of the basic pipeline in a mechanical hole expansion mode, and a layer of anti-corrosion metal pipe is added on the outer surface of the pipeline, so that the anti-corrosion performance of the whole pipeline is effectively improved, the service life and the safety and reliability of the pipeline are improved, and meanwhile, the production and operation cost of the pipeline is reduced.
In one aspect, the present invention provides a cathodic protection based multilayer composite metal tube comprising a base metal tube, a surface layer corrosion resistant metal tube, and an inner layer corrosion resistant metal tube; filling metal glue with sealing and bonding functions in an annular space between the base metal pipe and the surface corrosion-resistant metal pipe; metal glue with sealing and bonding functions is filled in an annular space between the base metal pipe and the inner layer corrosion-resistant metal pipe; the surface layer corrosion-resistant metal pipe is physically compounded with the base metal pipe through hot extrusion deformation of an extrusion head; the inner layer corrosion-resistant metal pipe is physically compounded with the base metal pipe through cold reaming of the reamer; the wall thickness ratio of the base metal pipe to the surface layer corrosion-resistant metal pipe is 3-4. (ii) a The ratio of the wall thickness of the base metal pipe to the wall thickness of the inner layer corrosion-resistant metal pipe is more than 4.5.
The above aspects and any possible implementation manners further provide an implementation manner, wherein the base metal pipe is a seamless rolled pipe or welded pipe with smooth inner and outer surfaces, and bears stress and load under the service condition of the metal pipe, and the out-of-roundness of the inner and outer circumferences of the base metal pipe is less than 3%.
The above aspects and any possible implementations further provide an implementation in which the corrosion-resistant performance layers of the surface layer corrosion-resistant metal pipe and the inner layer corrosion-resistant metal pipe are superior to those of the base metal pipe, and the oxidation-reduction properties of the surface layer corrosion-resistant metal pipe material and the inner layer corrosion-resistant metal pipe material are stronger than those of the base metal pipe material.
The above aspects and any possible implementation further provide an implementation in which the surface layer corrosion-resistant metal tube material has a strength lower than 60% -75% of that of the base metal tube material, and is suitable for extrusion molding, and the inner layer corrosion-resistant metal tube material has a strength lower than 55% of that of the base metal tube material.
The above aspects and any possible implementations further provide an implementation in which the elongation of the inner layer corrosion resistant metal tube material is greater than 16%.
The above aspects and any possible implementations further provide an implementation in which the surface layer corrosion-resistant metal tube material and the inner layer corrosion-resistant metal tube material are both preferably pure aluminum or 5000 series aluminum alloy.
The above aspects and any possible implementations further provide a method for producing a multilayer composite metal pipe, for producing the multilayer composite metal pipe, the method comprising the steps of:
s1: preparing a base metal pipe and a surface layer corrosion-resistant metal pipe, wherein the outer diameter of the base metal pipe is 3-5 mm smaller than the inner diameter of the surface layer corrosion-resistant metal pipe, and the inner diameter of the base metal pipe is 3-5 mm larger than the outer diameter of the inner layer corrosion-resistant metal pipe;
s2: coating a layer of metal adhesive on the outer surface of the base metal pipe at the interval of 1.5-2 m, and coating a layer of metal adhesive on the outer surface of the inner-layer corrosion-resistant metal pipe at the interval of 1.5-2 m;
s3: compounding, namely compounding the base metal pipe and the inner-layer corrosion-resistant metal pipe, and compounding the base metal pipe and the surface-layer corrosion-resistant metal pipe to obtain a multilayer composite metal pipe blank;
s4: and naturally cooling the multilayer composite metal pipe blank in air, and cutting off burrs at two ends to obtain the multilayer composite metal pipe.
According to the above aspect and any possible implementation manner, an implementation manner is further provided, in S2, the widths of the metal glue coated twice are both 280-320 mm, the thicknesses of the metal glue coated twice are both 0.4-0.6 mm, and the waiting time is both 30-40 min.
In the above aspect and any possible implementation manner, an implementation manner is further provided, before the base metal pipe and the inner layer corrosion-resistant metal pipe are composited in S3, the base metal pipe is preheated to 280-320 ℃, and the temperature is maintained for 5-10 min.
The above aspects and any possible implementation manners further provide an implementation manner, in S3, when the base metal pipe and the surface corrosion-resistant metal pipe are composited, the surface corrosion-resistant metal pipe is preheated to 400-.
Compared with the prior art, the invention can obtain the following technical effects:
1): according to the multilayer composite metal pipe based on cathodic protection and the manufacturing method thereof, the inner and outer corrosion-resistant alloy pipes with better corrosion resistance, stronger oxidability and lower strength are respectively compounded on the inner and outer surfaces of the base metal pipe, so that the corrosion-resistant metal layers are formed on the inner and outer surfaces of the base metal pipe, the overall corrosion resistance of the composite pipe is effectively improved, and the service life and the safety of the composite pipe are improved;
2): the metal glue in the annular space of the composite pipe effectively ensures annular sealing between the double-layer metal pipes and enables the composite metal pipes to be combined more tightly, so that the adhesive force of the composite metal pipes is increased;
3): the invention has the outstanding characteristics that: even if the inner layer and the outer layer of the anti-corrosion metal pipe are damaged or are used for a long time to corrode, thin and perforate, the basic metal pipe at the damaged point is protected by the cathode due to stronger oxidizability of the surface metal, the anti-corrosion performance of the whole bimetal composite pipe is not changed, the basic metal pipe is continuously protected and cannot corrode, so that the service performance of the whole bimetal composite pipe is not changed, and the service life of the bimetal composite pipe is greatly prolonged.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic illustration of a multilayer composite metal pipe as it is being manufactured according to one embodiment of the present invention.
Wherein, in the figure:
1-a base metal pipe, 2-a surface layer corrosion-resistant metal pipe, 3-an inner layer corrosion-resistant metal pipe, 4-metal glue between the base metal pipe and the surface layer corrosion-resistant metal pipe, 5-metal glue between the base metal pipe and the inner layer corrosion-resistant metal pipe, 6-a roller type reaming cone and 7-an extrusion head.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The invention provides a multilayer composite metal pipe based on cathodic protection, which comprises a base metal pipe, a surface layer corrosion-resistant metal pipe and an inner layer corrosion-resistant metal pipe, wherein the base metal pipe is a metal pipe; filling metal glue with sealing and bonding effects in the annular space gap between the base metal pipe and the surface corrosion-resistant metal pipe; metal glue with sealing and bonding functions is filled in an annular space between the base metal pipe and the inner layer corrosion-resistant metal pipe; the surface layer corrosion-resistant metal pipe is physically compounded with the base metal pipe through hot extrusion deformation of an extrusion head; the inner layer corrosion-resistant metal pipe is physically compounded with the base metal pipe through cold reaming of the reamer; the wall thickness ratio of the base metal pipe to the surface layer corrosion-resistant metal pipe is 3-4. (ii) a The ratio of the wall thickness of the base metal pipe to the wall thickness of the inner layer corrosion-resistant metal pipe is more than 4.5.
The basic metal pipe is a seamless rolled pipe or a welded pipe with smooth inner and outer surfaces, and bears stress and load under the working condition of the metal pipe, and the non-roundness of the inner circumference and the outer circumference of the basic metal pipe is less than 3%. The corrosion resistance layers of the surface layer corrosion-resistant metal pipe and the inner layer corrosion-resistant metal pipe are superior to those of the base metal pipe, and the oxidation reduction performance of the surface layer corrosion-resistant metal pipe and the inner layer corrosion-resistant metal pipe is stronger than that of the base metal pipe. The strength of the surface layer corrosion-resistant metal pipe material is lower than 60% -75% of that of the base metal pipe material, the surface layer corrosion-resistant metal pipe material is suitable for extrusion forming, and the strength of the inner layer corrosion-resistant metal pipe material is lower than 55% of that of the base metal pipe material. The elongation of the inner layer corrosion-resistant metal pipe material is more than 16 percent. The surface layer corrosion-resistant metal pipe material and the inner layer corrosion-resistant metal pipe material are both preferably pure aluminum or 5000 series aluminum alloy.
The invention also provides a preparation method of the multilayer composite metal pipe, which is used for preparing the multilayer composite metal pipe and comprises the following steps:
s1: preparing a base metal pipe and a surface layer corrosion-resistant metal pipe, wherein the outer diameter of the base metal pipe is 3-5 mm smaller than the inner diameter of the surface layer corrosion-resistant metal pipe, and the inner diameter of the base metal pipe is 3-5 mm larger than the outer diameter of the inner layer corrosion-resistant metal pipe;
s2: coating a layer of metal adhesive on the outer surface of the base metal pipe at the interval of 1.5-2 m, and coating a layer of metal adhesive on the outer surface of the inner-layer corrosion-resistant metal pipe at the interval of 1.5-2 m;
s3: compounding, namely compounding the base metal pipe and the inner-layer corrosion-resistant metal pipe, and compounding the base metal pipe and the surface-layer corrosion-resistant metal pipe to obtain a multilayer composite metal pipe blank;
s4: and naturally cooling the multilayer composite metal pipe blank in air, and cutting off burrs at two ends to obtain the multilayer composite metal pipe.
The width of the metal glue coated twice in the S2 is 280-320 mm, the thickness of the metal glue is 0.4-0.6 mm, and the waiting time is 30-40 min. Before the basic metal pipe and the inner layer corrosion-resistant metal pipe are compounded in S3, the basic metal pipe is preheated to 280-320 ℃, and the temperature is kept for 5-10 min. When the base metal pipe and the surface layer corrosion-resistant metal pipe are compounded in S3, the surface layer corrosion-resistant metal pipe is preheated to 400-.
As shown in figure 1, a multi-layer composite metal pipe based on cathodic protection and a manufacturing method thereof, the composite metal pipe is composed of a base metal pipe 1, a surface layer corrosion-resistant metal pipe 2 and an inner layer corrosion-resistant metal pipe 3; metal glue 4 with sealing function and bonding function is filled in the annular space between the basic metal pipe 1 and the surface layer corrosion-resistant metal pipe 2 at equal intervals; metal glue 5 with sealing function and bonding function is filled in the annular space between the base metal pipe 1 and the inner layer corrosion-resistant metal pipe 2 at equal intervals; the surface layer corrosion-resistant metal pipe 2 is physically compounded with the base metal pipe 1 through hot extrusion deformation of the extrusion head 6; the inner layer corrosion-resistant metal pipe 3 is physically compounded with the base metal pipe 1 through cold reaming of the reamer 7; the thickness of the base metal pipe 1 is 9mm, the thickness of the surface layer corrosion-resistant metal pipe 2 is 2.0mm, and the wall thickness of the inner layer corrosion-resistant metal pipe 3 is 1.5 mm.
In one embodiment, the base metal pipe 1 is a seamless rolled pipe made of low-alloy carbon steel with smooth inner and outer surfaces, has a material yield strength of 551MPa, and bears stress and load under the service condition of the metal pipe.
In a specific embodiment, the out-of-roundness of the inner and outer circumferences of the base metal pipe 1 before the compounding is less than 2%.
In one embodiment, the surface corrosion-resistant metal tube 2 is 2000 series aluminum alloy, the material strength is 380MPa, the corrosion-resistant layer is better than the base metal tube 1, and the oxidation-reduction property is stronger than that of the base metal tube 1.
In one embodiment, the inner corrosion-resistant metal tube 5 is made of 5000 series aluminum alloy, the strength of the material is 220MPa, the elongation is 20%, the corrosion-resistant layer is better than that of the base metal tube 1, and the oxidation-reduction property is stronger than that of the base metal tube 1.
In one embodiment, the base metal tube 1 has an outer diameter 4mm smaller than the inner diameter of the skin corrosion resistant metal tube 2 prior to compounding. The inner diameter of the base metal pipe 1 is 4mm larger than the outer diameter of the inner layer corrosion-resistant metal pipe 3
In one embodiment, before the multi-layer composite metal pipe is composited, a layer of metal glue 4 is coated on the outer surface of the base metal pipe 1 at the interval of 1.8m, and a layer of metal glue 5 is coated on the outer surface of the inner corrosion-resistant metal pipe 3 at the interval of 1.8 m.
In one embodiment, before compounding, the width of the metal glue 4 and the metal glue 5 is 300mm, the thickness is 0.5mm, and the waiting time is 36 min.
In one embodiment, when the multi-layer composite metal pipe is composited, the base metal pipe 1 and the inner layer corrosion-resistant metal pipe 3 are composited first, and then the base metal pipe 1 and the surface layer corrosion-resistant metal pipe 2 are composited.
In one embodiment, the base metal pipe 1 is preheated to 300 ℃ and then is insulated for 8min before the base metal pipe 1 is composited with the inner layer corrosion-resistant metal pipe 3.
In a specific embodiment, when the base metal pipe 1 is composited with the inner layer corrosion-resistant metal pipe 3, the inner layer corrosion-resistant metal pipe 3 is sleeved in the base metal pipe 1, and the bimetal compositing is realized by cold reaming of the inner layer corrosion-resistant metal pipe 3.
In one embodiment, when the base metal pipe 1 is composited with the inner corrosion-resistant metal pipe 3, cold reaming of the inner corrosion-resistant metal pipe 3 is performed by using a roller type reaming cone 6 and a mechanical reaming method of rotating and reaming.
In one embodiment, the surface corrosion resistant metal tube blank 2 is heated to 450 ℃ before the base metal tube 1 is clad with the surface corrosion resistant metal tube 2.
In one embodiment, when the base metal pipe 1 is composited with the surface corrosion-resistant metal pipe 2, the base metal pipe 1 is inserted into the extrusion surface corrosion-resistant metal pipe 2, the extrusion head 7 extrudes the surface corrosion-resistant metal pipe 2, and the base metal pipe 1 moves synchronously with the extrusion molding of the surface corrosion-resistant metal pipe 2.
In one embodiment, the multilayer composite metal pipe is naturally air-cooled after being compounded, and flash at two ends of the pipe body is turned.
According to the invention, by utilizing the characteristics that the inner and surface layer corrosion-resistant metal pipes have larger thermal expansion and cold shrinkage effects, and the inner and surface layer corrosion-resistant metal pipe materials have better corrosion resistance, stronger oxidability and lower strength compared with the base metal pipe material and are suitable for extrusion molding, the inner and outer surfaces of the base metal pipe are compounded with the surface layer corrosion-resistant metal pipe with a thinner thickness in a hot extrusion molding mode, so that a layer of corrosion-resistant metal layer is formed on the inner and outer surfaces of the base metal pipe, the integral corrosion resistance of the base metal pipe is effectively improved, and the service life and the safety of the composite pipe are improved. The metal glue added in the space of the two layers of metal pipe rings enables the metal pipes to be combined more tightly, so that the overall binding force and the integrity are increased. The anticorrosive composite metal pipe based on cathodic protection has the outstanding advantages that: even if the inner and surface corrosion-resistant metal layers are damaged or are corroded and thinned to be perforated after long-term use, the basic metal pipe at the damaged point is protected by the cathode due to stronger oxidizability of the surface metal, the corrosion resistance of the whole composite pipe is not changed, the basic metal pipe is continuously protected and cannot be corroded, so that the service performance of the whole composite pipe is not changed, and the service life of the composite pipe is greatly prolonged. The method specifically comprises the following steps: the advantages of 1, the inner and outer layers of metal pipe materials are corrosion resistant alloys, and have a corrosion resistant function. The contact channel between the basic metal and the external corrosive environment is completely isolated by utilizing the inner layer metal and the outer layer metal, so that the basic metal pipe is protected. And 2, the cathode protection of the sacrificial anode is adopted by utilizing the potential difference principle of the metal material. The protection is cathodic protection of micro-current formed by inner and outer layer corrosion-resistant metal materials and base materials due to potential difference on one hand, and is realized by stray current in buried environment, atmospheric environment and/or liquid conveying environment on the other hand. Compared with the existing inner and surface layer plating technology, because the plating layer is often a metal with lower potential such as chromium, nickel and the like, when the plating layer is incomplete (damaged), a microcell effect is formed between the plating layer metal at the damaged point and the base metal, and the corrosion of the base metal is accelerated. And 3, as the pipeline is exposed in the atmosphere and/or conveying materials for a long time and is easy to be damaged by the impact of the outside and/or the conveying materials, such as external mechanical damage, so that the base material is exposed, certain requirements on the strength and thickness of the inner and surface layer corrosion-resistant metal pipes are provided, and the breakage resistance is far higher than that of the conventional low-strength plastic coating layer and micron-sized metal coating layer. In conclusion, the corrosion-resistant pipeline can effectively solve the problem that pipelines of petroleum and natural gas pipelines and petroleum refining and chemical raw material production enterprises are exposed to humid air or stratum with corrosive media for a long time to cause corrosion of the inner surface and the outer surface of the pipelines, and improves the use safety and the service life of the pipelines.
The embodiments of the present application provide a multi-layer composite metal tube based on cathodic protection and a method for manufacturing the same. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The following description is of the preferred embodiment for carrying out the present application, but is made for the purpose of illustrating the general principles of the application and is not to be taken in a limiting sense. The scope of the present application is to be construed in accordance with the substance defined by the following claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. The multilayer composite metal pipe based on the cathodic protection is characterized by comprising a base metal pipe, a surface layer corrosion-resistant metal pipe and an inner layer corrosion-resistant metal pipe; filling metal glue with sealing and bonding functions in an annular space between the base metal pipe and the surface corrosion-resistant metal pipe; metal glue with sealing and bonding functions is filled in an annular space between the base metal pipe and the inner layer corrosion-resistant metal pipe; the surface layer corrosion-resistant metal pipe is physically compounded with the base metal pipe through hot extrusion deformation of the extrusion head; the inner layer corrosion-resistant metal pipe is physically compounded with the base metal pipe through cold reaming of the reamer; the wall thickness ratio of the base metal pipe to the surface layer corrosion-resistant metal pipe is 3-4; the ratio of the wall thickness of the base metal pipe to the wall thickness of the inner layer corrosion-resistant metal pipe is more than 4.5.
2. The multi-layer composite metal pipe as claimed in claim 1, wherein the base metal pipe is a seamless rolled pipe or welded pipe with smooth inner and outer surfaces, and bears stress and load under service conditions of the metal pipe, and the non-circularity of both the inner and outer circumferences of the base metal pipe is less than 3%.
3. The multi-layered composite metal pipe as claimed in claim 1, wherein the corrosion resistant layers of the surface layer corrosion resistant metal pipe and the inner layer corrosion resistant metal pipe are superior to those of the base metal pipe, and the oxidation reduction properties of the surface layer corrosion resistant metal pipe material and the inner layer corrosion resistant metal pipe material are stronger than those of the base metal pipe material.
4. The multi-layered composite metal tube as claimed in claim 1, wherein the surface layer corrosion-resistant metal tube material has a strength of 60-75% lower than that of the base metal tube material and is suitable for extrusion molding, and the inner layer corrosion-resistant metal tube material has a strength of 55% lower than that of the base metal tube material.
5. The multilayer composite metal tube of claim 1, wherein the elongation of the inner corrosion resistant metal tube material is greater than 16%.
6. The multi-layered composite metal pipe according to claim 5, wherein the surface layer corrosion-resistant metal pipe material and the inner layer corrosion-resistant metal pipe material are preferably pure aluminum or 5000 series aluminum alloy.
7. A method of manufacturing a multilayer composite metal tube for manufacturing a multilayer composite metal tube according to any one of claims 1 to 6, characterized in that it comprises the steps of:
s1: preparing a base metal pipe and a surface layer corrosion-resistant metal pipe, wherein the outer diameter of the base metal pipe is 3-5 mm smaller than the inner diameter of the surface layer corrosion-resistant metal pipe, and the inner diameter of the base metal pipe is 3-5 mm larger than the outer diameter of the inner layer corrosion-resistant metal pipe;
s2: coating a layer of metal adhesive on the outer surface of the base metal pipe at the interval of 1.5-2 m, and coating a layer of metal adhesive on the outer surface of the inner-layer corrosion-resistant metal pipe at the interval of 1.5-2 m;
s3: compounding, namely compounding the base metal pipe and the inner-layer corrosion-resistant metal pipe, and compounding the base metal pipe and the surface-layer corrosion-resistant metal pipe to obtain a multilayer composite metal pipe blank;
s4: and naturally cooling the multilayer composite metal pipe blank in air, and cutting off burrs at two ends to obtain the multilayer composite metal pipe.
8. The preparation method according to claim 7, wherein the width of the metal paste coated twice in S2 is 280-320 mm, the thickness is 0.4-0.6 mm, and the waiting time is 30-40 min.
9. The method as claimed in claim 7, wherein the base metal tube is preheated to 280-320 ℃ and then is heat-insulated for 5-10 min before the base metal tube and the inner layer corrosion-resistant metal tube are combined in S3.
10. The method as claimed in claim 7, wherein the base metal tube and the surface corrosion-resistant metal tube are combined in S3, the surface corrosion-resistant metal tube is preheated to 400-.
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| CN202210177067.7A CN114607839A (en) | 2022-02-24 | 2022-02-24 | Multilayer composite metal pipe based on cathodic protection and preparation method thereof |
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| CN202210177067.7A CN114607839A (en) | 2022-02-24 | 2022-02-24 | Multilayer composite metal pipe based on cathodic protection and preparation method thereof |
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