CN114484087A - External surface anti-corrosion composite metal pipe based on cathodic protection and manufacturing method thereof - Google Patents
External surface anti-corrosion composite metal pipe based on cathodic protection and manufacturing method thereof Download PDFInfo
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- CN114484087A CN114484087A CN202210074307.0A CN202210074307A CN114484087A CN 114484087 A CN114484087 A CN 114484087A CN 202210074307 A CN202210074307 A CN 202210074307A CN 114484087 A CN114484087 A CN 114484087A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 125
- 239000002184 metal Substances 0.000 title claims abstract description 125
- 238000005260 corrosion Methods 0.000 title claims abstract description 100
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000004210 cathodic protection Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 230000007797 corrosion Effects 0.000 claims abstract description 85
- 239000010410 layer Substances 0.000 claims abstract description 83
- 239000002344 surface layer Substances 0.000 claims abstract description 58
- 239000010953 base metal Substances 0.000 claims abstract description 41
- 229910052728 basic metal Inorganic materials 0.000 claims abstract description 28
- 150000003818 basic metals Chemical class 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000003292 glue Substances 0.000 claims abstract description 18
- 229910000838 Al alloy Inorganic materials 0.000 claims description 12
- 238000013329 compounding Methods 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 7
- 230000004323 axial length Effects 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000002468 redox effect Effects 0.000 claims description 2
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 229910000975 Carbon steel Inorganic materials 0.000 description 8
- 239000010962 carbon steel Substances 0.000 description 8
- 238000001192 hot extrusion Methods 0.000 description 4
- 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
- 238000005536 corrosion prevention Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000013064 chemical raw material Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000465 moulding Methods 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
- 238000007789 sealing Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- -1 chromium and nickel Chemical class 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000035882 stress Effects 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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- 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)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention provides an outer surface anti-corrosion composite metal pipe based on cathodic protection and a manufacturing method thereof, which relate to the technical field of anti-corrosion pipelines, can obviously improve the use safety and the service life of the metal pipeline, and can still ensure that an inner layer base pipe is not corroded even if a surface anti-corrosion metal layer is damaged or perforated; the composite metal pipe comprises an inner layer base metal pipe and a surface layer corrosion-resistant metal pipe; the inner layer base metal pipe and the surface layer corrosion-resistant metal pipe are fixedly assembled in a sleeving manner; a plurality of annular metal glues which are arranged at intervals are arranged between the inner layer base metal pipe and the surface layer corrosion-resistant metal pipe; the oxidation-reduction property of the surface layer corrosion-resistant metal pipe material is stronger than that of the inner layer basic metal pipe material. The technical scheme provided by the invention is suitable for the design and manufacture of the corrosion-resistant metal pipe.
Description
Technical Field
The invention relates to the technical field of corrosion-resistant pipelines, in particular to an outer surface corrosion-resistant composite metal pipe based on cathodic protection and a manufacturing method thereof.
Background
In petroleum and natural gas pipeline transportation and petroleum refining and chemical raw material production enterprises, a large number of pipelines are exposed to humid air or stratum with corrosive media for a long time, so that the outer surface of the pipeline is seriously corroded, the use safety and the service life of the pipeline are directly influenced, even serious safety accidents are caused due to pipeline leakage, and material loss, environmental pollution and even serious consequences of casualties are caused. Currently, the use of corrosion-resistant metal materials for the entire pipe or the application of corrosion-resistant coatings on the outer surface of the pipe is an effective means for solving such corrosion-resistant problems. However, the use of corrosion-resistant metal materials for the entire pipeline would greatly increase the production and operating costs of the pipeline; the plastic anticorrosive coating coated on the outer surface of the pipeline is easy to age and crack and has short aging; the metal coating or the organic coating on the outer surface of the pipeline is thin in thickness, has potential difference with a base material, and can generate electrochemical corrosion with the base metal after being damaged, so that the corrosion of the base pipe is accelerated.
Accordingly, there is a need to address the deficiencies of the prior art by developing a sacrificial anode based cathodically protected, exterior surface corrosion resistant composite metal tube and method of making the same that addresses or alleviates one or more of the problems set forth above.
Disclosure of Invention
In view of the above, the present invention provides an external surface anti-corrosion composite metal pipe based on cathodic protection and a manufacturing method thereof, which can significantly improve the use safety and the service life of a metal pipeline, and ensure that the inner layer base pipe is not corroded even when the surface anti-corrosion metal layer is damaged or perforated.
In one aspect, the invention provides an external surface anti-corrosion composite metal pipe based on cathodic protection, which is characterized in that the composite metal pipe comprises an inner layer base metal pipe and a surface layer anti-corrosion metal pipe;
the inner layer base metal pipe and the surface layer corrosion-resistant metal pipe are fixedly assembled in a sleeving manner;
and a plurality of annular metal glues arranged at intervals are arranged between the inner layer base metal pipe and the surface layer corrosion-resistant metal pipe.
The above aspects and any possible implementations further provide an implementation in which the surface layer corrosion-resistant metal tube material has a higher redox property than the inner layer base metal tube material.
The above aspects and any possible implementation manners further provide an implementation manner that the wall thickness ratio of the inner layer base metal pipe to the surface layer corrosion-resistant metal pipe is 3-4.
The above aspects and any possible implementations further provide an implementation in which the material strength of the surface layer corrosion-resistant metal pipe is lower than 60% to 75% of the material strength of the inner layer base metal pipe.
The above aspects and any possible implementations further provide an implementation in which the inner base metal tube is a seamless rolled or welded tube with a smooth outer surface; the surface layer corrosion-resistant metal pipe is made of pure aluminum or aluminum alloy.
The above aspect and any possible implementation manner further provide an implementation manner, and the axial length of the annular space is 1.5-2 m.
In another aspect, the present invention provides a method for manufacturing an external surface corrosion-resistant composite metal pipe based on cathodic protection as defined in any one of the above, the method comprising the steps of:
s1, performing diameter finishing on the outer surface of the inner-layer basic metal pipe to enable the out-of-roundness of the outer diameter of the inner-layer basic metal pipe to be less than 1%;
s2, coating metal glue on the outer surface of the inner-layer base metal pipe with the outer diameter finished in a circumferential mode;
s3, inserting the inner layer base metal pipe coated with the metal glue into the surface layer corrosion-resistant metal pipe at a proper temperature;
s4, performing extrusion molding on the surface layer corrosion-resistant metal pipe by using extrusion equipment to realize physical compounding of the inner layer basic metal pipe and the surface layer corrosion-resistant metal pipe;
and S5, cooling to obtain the composite metal pipe.
The above aspects and any possible implementation manners further provide an implementation manner that the outer diameter of the inner layer base metal pipe is 3-5 mm smaller than the inner diameter of the surface layer corrosion-resistant metal pipe before physical recombination.
The above aspects and any possible implementation manners further provide an implementation manner that the temperature of the surface layer corrosion-resistant metal pipe is 400-500 ℃ before physical composition.
According to the above aspect and any possible implementation manner, there is further provided an implementation manner, in step S2, the axial length of the metal paste is 280-320 mm, the thickness is 0.4-0.6 mm, and the waiting time is 30-40 min.
In the above aspect and any possible implementation manner, there is further provided an implementation manner that in step S5, the flashes at the two ends of the composite metal pipe body are cut off after cooling.
The above aspects and any possible implementation manners further provide an implementation manner, after the combination, due to the natural shrinkage of the surface layer corrosion-resistant metal pipe after cooling, the bonding strength between the inner layer base metal pipe and the surface layer corrosion-resistant metal pipe reaches more than 50 MPa.
Compared with the prior art, one of the technical schemes has the following advantages or beneficial effects: a thin surface layer corrosion-resistant metal pipe is compounded on the outer surface of the inner layer basic metal pipe in a hot extrusion molding mode, so that a corrosion-resistant metal layer is formed on the outer surface of the basic metal pipe, the integral corrosion resistance of the inner layer basic metal pipe is effectively improved, and the service life and the safety of the composite pipe are improved;
another technical scheme in the above technical scheme has the following advantages or beneficial effects: even if the surface corrosion-resistant metal layer is damaged or is corroded, thinned and perforated after long-term use, the basic metal pipe at the damaged point is subjected to cathodic protection due to stronger oxidizability of the surface metal, the corrosion resistance of the whole bimetal composite pipe is not changed, and the inner layer basic metal pipe is continuously protected and cannot be corroded.
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 structural diagram of an external surface corrosion-resistant composite metal pipe based on cathodic protection according to an embodiment of the present invention.
1. An inner base metal tube; 2. a surface layer corrosion-resistant metal pipe; 3. metal glue; 4. and (4) extruding the head.
Detailed Description
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.
Aiming at the technical problem of corrosion prevention of the outer surface of a pipeline in the prior art, the invention provides the composite metal pipe with the outer surface corrosion prevention based on the cathodic protection and the manufacturing method thereof.
In order to solve the technical problems, the invention is realized by the following technical scheme:
an outer surface anti-corrosion composite metal pipe based on cathode protection comprises an inner layer base metal pipe 1 and a surface layer anti-corrosion metal pipe 2; the annular space between the inner layer basic metal pipe 1 and the surface layer corrosion-resistant metal pipe 2 is filled with metal glue 3 with sealing and bonding functions; the surface layer corrosion-resistant metal pipe 2 is physically compounded with the inner layer basic metal pipe 1 by a hot extrusion deformation method; the wall thickness ratio of the compounded inner layer basic metal pipe 1 and the surface layer corrosion-resistant metal pipe 2 is more than 3. The inner layer base metal pipe 1 is a seamless rolled pipe or a welded pipe with a smooth outer surface, and can bear stress and load in service.
The out-of-roundness of the outer circumference of the selected inner layer base metal pipe 1 needs to be less than 3% before diameter finishing.
The requirements of the surface layer corrosion-resistant metal pipe 2 and the inner layer base metal pipe 1 in terms of material properties include: the corrosion resistance of the surface layer corrosion-resistant metal pipe 2 is superior to that of the inner layer basic metal pipe 1; the oxidation-reduction property of the material of the surface layer corrosion-resistant metal pipe 2 is stronger than that of the material of the inner layer basic metal pipe 1; the strength of the surface corrosion-resistant metal pipe 2 is lower than 75% of that of the base metal pipe 1, but not more than 60%, and is suitable for extrusion molding. The material of the surface corrosion-resistant metal pipe 2 is preferably pure aluminum or aluminum alloy.
Before compounding, diameter finishing is firstly carried out on the outer surface of the inner-layer basic metal pipe 1, and after finishing, the out-of-roundness of the outer surface of the inner-layer basic metal pipe 1 is less than 1%. The outer diameter of the inner layer base metal pipe 1 is 3-5 mm smaller than the inner diameter of the surface layer corrosion-resistant metal pipe 2. A plurality of annular metal glues 3 are smeared on the surface of inlayer basis tubular metal resonator 1, and the axial interval of two adjacent metal glues 3 is 1.5 ~ 2 m. The axial length of the metal glue 3 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 compounding, the surface layer corrosion-resistant metal pipe (blank) 2 is heated to 400-500 ℃, and then compounding is carried out.
During compounding, the inner layer base metal pipe 1 is inserted into the surface layer corrosion-resistant metal pipe 2, then the extrusion head 4 extrudes the surface layer corrosion-resistant metal pipe 2 from the outside, and the inner layer base metal pipe 1 moves synchronously along with the extrusion molding of the surface layer corrosion-resistant metal pipe 2. And naturally cooling in air after compounding, and then turning off the flashes at two ends of the pipe body of the composite pipe.
After the compounding, the bonding strength between the inner layer base metal pipe 1 and the surface layer corrosion-resistant metal pipe 2 reaches more than 50MPa due to the natural shrinkage of the surface layer corrosion-resistant metal pipe 2 after cooling.
According to the invention, by utilizing the characteristics that the surface layer corrosion-resistant metal pipe has larger thermal expansion and cold shrinkage effects, and the surface layer corrosion-resistant metal pipe has better corrosion resistance, stronger oxidability and lower strength than the inner layer basic metal pipe and is suitable for extrusion molding, the surface layer corrosion-resistant metal pipe with a thinner thickness is compounded on the outer surface of the inner layer basic metal pipe in a hot extrusion molding mode, so that an anticorrosion metal layer is formed on the outer surface of the basic metal pipe, the integral anticorrosion performance of the inner layer basic metal pipe is effectively improved, and the service life and the safety of the compound pipe are improved. The metal glue added in the space of the two layers of metal pipe rings enables the combination of the two layers of metal pipes to be tighter, thereby increasing the combination force and the integrity of the bimetal composite pipe. The anticorrosive composite metal pipe based on cathodic protection has the outstanding advantages that: even if the surface corrosion-resistant metal layer is damaged or is 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 bimetal composite pipe is not changed, the inner layer basic metal pipe is continuously protected and cannot be corroded, 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. The method comprises the following specific steps: the advantage 1 is that the outer layer metal pipe material is corrosion resistant alloy and has a corrosion resistant function. The contact channel between the inner layer metal and the external corrosive environment is completely isolated by the outer layer metal, so that the inner layer base 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 outer layer corrosion-resistant metal material and inner layer base material due to potential difference on one hand, and is cathodic protection of external current type realized by stray current existing in buried environment/atmospheric environment on the other hand. Compared with the existing surface plating technology, because the plating layer is often made of lower-potential metals such as chromium and nickel, when the plating layer is incomplete (damaged), a micro-battery effect is formed between the plating layer metal at the damaged point and the base metal, so that the corrosion of the base metal is accelerated. And 3, the pipeline is exposed in the atmosphere for a long time and is easily damaged by the impact of external substances, such as external mechanical damage, so that the base material is exposed, certain requirements are provided for the strength and thickness of the surface layer corrosion-resistant metal pipe, and the breakage resistance is far higher than that of a conventional low-strength plastic coating layer and a micron-sized metal coating layer. In conclusion, the pipeline corrosion prevention device can effectively solve the problem that pipelines of petroleum and natural gas pipelines and pipelines of 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 outer surfaces of the pipelines, and improves the use safety and the service life of the pipelines.
Example 1:
as shown in fig. 1, an external surface corrosion-resistant composite metal pipe based on cathodic protection comprises an inner layer base metal pipe 1 and a surface layer corrosion-resistant metal pipe 2; the annular space between the inner layer basic metal pipe 1 and the surface layer corrosion-resistant metal pipe 2 is filled with metal glue 3 with sealing and bonding functions; the surface layer corrosion-resistant metal pipe 2 is physically compounded with the inner layer basic metal pipe 1 by a hot extrusion deformation method; the thickness of the inner layer basic metal pipe 1 is 8mm, and the thickness of the surface layer corrosion-resistant metal pipe 2 is 2.5 mm.
In this example, the inner layer base metal pipe 1 is a seamless rolled pipe made of a low alloy carbon steel material having a smooth outer surface, and has a material yield strength of 551 MPa. The out-of-roundness of the outer circumference of the inner layer base metal pipe 1 is less than 2.5%. The surface layer corrosion-resistant metal pipe 2 is made of 2000 series aluminum alloy, and the yield strength of the material is 338 MPa.
Before compounding, the outer surface of the inner layer low-alloy carbon steel pipe is subjected to diameter finishing, and the out-of-roundness after finishing is 0.8%. The outer diameter of the inner layer low-alloy carbon steel pipe 1 is 4mm smaller than the inner diameter of the surface layer 2000 series aluminum alloy pipe 2. And coating a layer of annular metal glue 3 on the outer surface of the inner-layer low-alloy carbon steel pipe 1 at an axial distance of 1.8 m. The axial length of the metal glue 3 is 300mm, the thickness is 0.5mm, and the waiting setting time is 36 min. Heating the surface layer 2000 series aluminum alloy pipe (billet) 2 to 440 ℃, and preserving heat for 10 min.
During compounding, the inner low-alloy carbon steel pipe 1 is inserted into the surface 2000 series aluminum alloy pipe 2 in a high-temperature state, the extrusion head 4 extrudes the surface 2000 series aluminum alloy 2, and the inner low-alloy carbon steel pipe 1 synchronously moves along with the extrusion molding of the surface 2000 series aluminum alloy pipe 2. And (3) naturally cooling the inner layer low-alloy carbon steel pipe 1 and the surface layer 2000 series aluminum alloy pipe 2 after compounding, and turning off the flashes at two ends of the composite pipe body.
After the compounding, the bonding strength between the inner layer low alloy carbon steel pipe 1 and the surface layer 2000 series aluminum alloy pipe 2 reaches 100MPa or more due to the natural shrinkage of the surface layer 2000 series aluminum alloy pipe 2 after cooling.
The external surface corrosion-resistant composite metal pipe based on cathodic protection and the manufacturing method thereof provided by the embodiment of the application are described in detail above. 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.
It should also be 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. "substantially" means within an acceptable error range, that a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
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. In this application, the terms "upper", "lower", "left", "right", "inner", "outer", "center", "lateral", "vertical", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. Some of the above terms may be used to indicate other meanings in addition to orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of dependency or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate. The term "and/or" as used herein is merely an associative relationship 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.
Claims (10)
1. The outer surface anti-corrosion composite metal pipe based on the cathodic protection is characterized by comprising an inner layer base metal pipe and a surface layer anti-corrosion metal pipe;
the inner layer base metal pipe and the surface layer corrosion-resistant metal pipe are fixedly assembled in a sleeving manner;
and a plurality of annular metal glues arranged at intervals are arranged between the inner layer base metal pipe and the surface layer corrosion-resistant metal pipe.
2. The external surface corrosion-resistant composite metal pipe based on cathodic protection as defined in claim 1, wherein said surface layer corrosion-resistant metal pipe material has a redox property stronger than that of said inner layer base metal pipe material.
3. The external surface corrosion-resistant composite metal pipe based on cathodic protection as claimed in claim 1, wherein the wall thickness ratio of the inner layer base metal pipe to the surface layer corrosion-resistant metal pipe is 3-4.
4. The external surface corrosion-resistant composite metal pipe based on cathodic protection as claimed in claim 1, wherein the material strength of the surface layer corrosion-resistant metal pipe is lower than 60% -75% of the material strength of the inner layer base metal pipe.
5. The external surface corrosion-resistant composite metal pipe based on cathodic protection as defined in claim 1, wherein the inner layer base metal pipe is a seamless rolled pipe or welded pipe with a smooth external surface; the surface layer corrosion-resistant metal pipe is made of pure aluminum or aluminum alloy.
6. The external surface corrosion-resistant composite metal pipe based on cathodic protection as claimed in claim 1, wherein the axial length of the annular space is 1.5-2 m.
7. A method of manufacturing an external surface corrosion resistant composite metal tube based on cathodic protection as defined in any one of claims 1 to 6, wherein the steps of said method comprise:
s1, performing diameter finishing on the outer surface of the inner-layer basic metal pipe to enable the out-of-roundness of the outer diameter of the inner-layer basic metal pipe to be less than 1%;
s2, coating metal glue on the whole circumference of the outer surface of the inner-layer base metal pipe with the outer diameter finished;
s3, inserting the inner layer base metal pipe coated with the metal glue into the surface layer corrosion-resistant metal pipe at a proper temperature;
s4, performing extrusion molding on the surface layer corrosion-resistant metal pipe by using extrusion equipment to realize physical compounding of the inner layer basic metal pipe and the surface layer corrosion-resistant metal pipe;
and S5, cooling to obtain the composite metal pipe.
8. The method of claim 7, wherein the outer diameter of the inner base metal tube is 3 to 5mm smaller than the inner diameter of the surface corrosion resistant metal tube before physical composition.
9. The method for manufacturing the external surface anti-corrosion composite metal pipe based on the cathodic protection as claimed in claim 7, wherein in the step S2, the axial length of the metal glue is 280-320 mm, the thickness is 0.4-0.6 mm, and the waiting time is 30-40 min.
10. The method for manufacturing an external surface anti-corrosion composite metal pipe based on cathodic protection as claimed in claim 7, wherein in step S5, the flashes at both ends of the composite metal pipe body are cut off after cooling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210074307.0A CN114484087A (en) | 2022-01-21 | 2022-01-21 | External surface anti-corrosion composite metal pipe based on cathodic protection and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210074307.0A CN114484087A (en) | 2022-01-21 | 2022-01-21 | External surface anti-corrosion composite metal pipe based on cathodic protection and manufacturing method thereof |
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| CN114484087A true CN114484087A (en) | 2022-05-13 |
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