CN109321093A - A kind of processing technology improving plastic-coated steel corrosion resistance - Google Patents
A kind of processing technology improving plastic-coated steel corrosion resistance Download PDFInfo
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- CN109321093A CN109321093A CN201811135875.7A CN201811135875A CN109321093A CN 109321093 A CN109321093 A CN 109321093A CN 201811135875 A CN201811135875 A CN 201811135875A CN 109321093 A CN109321093 A CN 109321093A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Paints Or Removers (AREA)
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Abstract
The invention discloses a kind of processing technologys for improving plastic-coated steel corrosion resistance, comprising the following steps: carries out blasting treatment to steel pipe, steel tube surface derusting grade is made to reach Sa2.5 grades；Steel pipe after derusting is preheated, is preheated to 180-250 DEG C, then corrosion resistant powder coating is coated in steel tube surface, forms corrosion-resistant finishes after melted by heating；Steel pipe is placed 30-50 minutes, comes into full contact with corrosion resistant powder coating with steel tube surface；Solidification advection is carried out, the high plastic-coated steel of corrosion resistance is obtained.Corrosion resistance using the plastic-coated steel of the method for the present invention preparation is strong, and non-scaling, non-corrosive, coating layer is firmly combined with steel pipe walls, not easily to fall off, long service life.
Description
Technical field
The present invention relates to pipeline preparation field more particularly to a kind of processing technologys for improving plastic-coated steel corrosion resistance.
Background technique
Steel pipe is in transmission medium or is placed in the environment such as atmosphere, soil, and steel pipe inside and outside wall can all be subjected to different degrees of
Corrosion, has seriously affected the service life of pipeline.All multimediums such as food, drinking water pipeline, petrochemical pipe do not allow
Corrosion of the pipe wall and influence transmission medium and be contaminated, therefore the anti-corrosion protection question of steel pipe become key technology, plastic coated composite steel
Pipe just comes into being.
Powdery paints is homogeneously applied to steel pipe wall using special technique and special equipment by Coating Technology of Steel Pipe, is passed through
After solidification (or plasticizing), one layer of smooth, smooth, firm protective layer is formed in tube wall, pipeline is made to become composite article.It was both protected
The original strength and stiffness of steel pipe have been held, and have had the characteristics that plastic coating antiseptic property is excellent, smooth abrasion-proof, to prolong significantly
The service life of steel pipe is grown.
The corrosion resistance of plastic-coated steel is the important indicator of evaluation plastic-coated steel quality, but not due to coating material selection
When reasons such as, production technology lag, the anti-corrosion effect of plastic-coated steel will receive influences, and plastic coating part spot corrosion occurs, makes
At leaktightness of wall of tubes or perforation, tube body is made to lose protective effect.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of processing for improving plastic-coated steel corrosion resistance
Technique.
The present invention provides a kind of processing technologys for improving plastic-coated steel corrosion resistance, comprising the following steps:
S1, blasting treatment is carried out to steel pipe, steel tube surface derusting grade is made to reach Sa2.5 grades；
S2, steel pipe after derusting is preheated, is preheated to 180-250 DEG C, then coat corrosion resistant powder coating in steel tube surface,
Corrosion-resistant finishes is formed after melted by heating；
S3, the steel pipe of coated corrosion resistant powder coating is placed 30-50 minutes, fills corrosion resistant powder coating with steel tube surface
Tap touching；
S4, solidification advection is carried out, obtains the high plastic-coated steel of corrosion resistance.
Preferably, the raw material of corrosion resistant powder coating includes: 50-60 parts of bisphenol A type epoxy resin, phenolic aldehyde ring by weight
30-40 parts of oxygen resin, 5-10 parts of saturated polyester resin, 8-12 parts of blanc fixe part, 6-10 parts of mica powder, 4-7 parts of silica,
Modified aluminium triphosphate 4-7 parts, 10-13 parts of phenols curing agent, 1-2 parts of 788 levelling agent, 0.3-0.4 parts of styrax, imidazoles 0.5-
0.6 part.
Preferably, in the raw material of corrosion resistant powder coating, bisphenol A type epoxy resin, novolac epoxy resin, saturated polyester tree
The weight ratio of rouge is 6.5-9.5:4-6.5:1.
Preferably, in the raw material of corrosion resistant powder coating, blanc fixe part, mica powder, silica weight ratio be
1.6-2.3:1.4-1.8:1。
Preferably, the preparation method of corrosion resistant powder coating includes: to be uniformly mixed each component in raw material, and heating is molten
Melt, squeezes out molten mixture and be crushed after molten mixture is cooling, be ground up, sieved to obtain corrosion resistant powder coating.
Preferably, the partial size of corrosion resistant powder coating is 400-500 mesh.
Preferably, corrosion-resistant finishes with a thickness of 0.3-0.5 millimeters.
Preferably, steel pipe after derusting is preheated to 200-220 DEG C in S2.
Preferably, the temperature for solidifying advection is 180-200 DEG C.
Preferably, steel tube surface is steel pipe inner wall surface and/or outer wall of steel pipe surface.
Preferably, steel pipe is welded still pipe, seamless steel pipe or stainless-steel pipe.
The powdery paints of the preferred excellent anti-corrosion performance of the present invention, and cooperate suitable production technology, the painting being prepared
The corrosion resistance of Plastic Steel Pipe is strong, non-scaling, non-corrosive, and coating layer is firmly combined with steel pipe walls, not easily to fall off, service life
It is long.
The raw material for the corrosion resistant powder coating that the present invention uses includes bisphenol A type epoxy resin, novolac epoxy resin, saturation
Polyester resin, blanc fixe part, mica powder, silica, modified aluminium triphosphate, curing agent, levelling agent, styrax, imidazoles
Deng being formulated excellent, various components cooperate, and anticorrosion effect is good；Bisphenol A type epoxy resin, phenolic aldehyde ring are advanced optimized
Oxygen resin, saturated polyester resin weight ratio be 6.5-9.5:4-6.5:1, improve the adhesive force of powdery paints, the coating of formation
Flexibility and highly polished；Advanced optimized blanc fixe part, mica powder, silica weight ratio be 1.6-2.3:1.4-
1.8:1 improves the corrosion resistance of powdery paints, and wear-resisting property also gets a promotion；Modified aluminium triphosphate can with it is each
Metal ion species generate chelate, and brilliant purification membrane is formed in steel tube surface, have the function of inhibiting corrosion.
Specific embodiment
In the following, technical solution of the present invention is described in detail by specific embodiment.
Embodiment 1
A kind of corrosion resistant powder coating, raw material include: 53 parts of bisphenol A type epoxy resin, novolac epoxy resin 33 by weight
Part, 8 parts of saturated polyester resin, 10 parts of blanc fixe part, 8 parts of mica powder, 5 parts of silica, modified 7 parts of aluminium triphosphate, phenol
11 parts of class curing agent, 1.9 parts of 788 levelling agent, 0.34 part of styrax, 0.56 part of imidazoles.
Bisphenol A type epoxy resin, novolac epoxy resin, saturated polyester resin weight ratio be 6.6:4.1:1.
Blanc fixe part, mica powder, silica weight ratio be 2:1.6:1.
The preparation method of corrosion resistant powder coating includes: to be uniformly mixed each component in raw material, heating melting, is squeezed out molten
Melt mixture, after molten mixture is cooling, is crushed, is ground up, sieved to obtain the corrosion resistant powder coating that partial size is 440 mesh.
Embodiment 2
A kind of corrosion resistant powder coating, raw material include: 56 parts of bisphenol A type epoxy resin, novolac epoxy resin 38 by weight
Part, 6 parts of saturated polyester resin, 11 parts of blanc fixe part, 9 parts of mica powder, 6 parts of silica, modified 5 parts of aluminium triphosphate, phenol
12 parts of class curing agent, 1.3 parts of 788 levelling agent, 0.37 part of styrax, 0.58 part of imidazoles.
Bisphenol A type epoxy resin, novolac epoxy resin, saturated polyester resin weight ratio be 9.3:6.3:1.
Blanc fixe part, mica powder, silica weight ratio be 1.8:1.5:1.
The preparation method of corrosion resistant powder coating includes: to be uniformly mixed each component in raw material, heating melting, is squeezed out molten
Melt mixture, after molten mixture is cooling, is crushed, is ground up, sieved to obtain the corrosion resistant powder coating that partial size is 460 mesh.
Embodiment 3
A kind of corrosion resistant powder coating, raw material include: 58 parts of bisphenol A type epoxy resin, novolac epoxy resin 36 by weight
Part, 7 parts of saturated polyester resin, 9 parts of blanc fixe part, 7 parts of mica powder, 4 parts of silica, modified 6 parts of aluminium triphosphate, phenols
10 parts of curing agent, 1.5 parts of 788 levelling agent, 0.32 part of styrax, 0.53 part of imidazoles.
Bisphenol A type epoxy resin, novolac epoxy resin, saturated polyester resin weight ratio be 8.3:5.1:1.
Blanc fixe part, mica powder, silica weight ratio be 2.25:1.75:1.
The preparation method of corrosion resistant powder coating includes: to be uniformly mixed each component in raw material, heating melting, is squeezed out molten
Melt mixture, after molten mixture is cooling, is crushed, is ground up, sieved to obtain the corrosion resistant powder coating that partial size is 480 mesh.
Embodiment 4
A kind of corrosion resistant powder coating, raw material include: 51 parts of bisphenol A type epoxy resin, novolac epoxy resin 39 by weight
Part, 5 parts of saturated polyester resin, 8 parts of blanc fixe part, 10 parts of mica powder, 7 parts of silica, modified 6 parts of aluminium triphosphate, phenol
11 parts of class curing agent, 1.7 parts of 788 levelling agent, 0.35 part of styrax, 0.52 part of imidazoles.
Bisphenol A type epoxy resin, novolac epoxy resin, saturated polyester resin weight ratio be 10.2:7.8:1.
Blanc fixe part, mica powder, silica weight ratio be 1.1:1.43:1.
The preparation method of corrosion resistant powder coating includes: to be uniformly mixed each component in raw material, heating melting, is squeezed out molten
Melt mixture, after molten mixture is cooling, is crushed, is ground up, sieved to obtain the corrosion resistant powder coating that partial size is 420 mesh.
Embodiment 5
A kind of corrosion resistant powder coating, raw material include: 57 parts of bisphenol A type epoxy resin, novolac epoxy resin 35 by weight
Part, 9 parts of saturated polyester resin, 12 parts of blanc fixe part, 6 parts of mica powder, 6 parts of silica, modified 4 parts of aluminium triphosphate, phenol
13 parts of class curing agent, 1.1 parts of 788 levelling agent, 0.39 part of styrax, 0.57 part of imidazoles.
Bisphenol A type epoxy resin, novolac epoxy resin, saturated polyester resin weight ratio be 6.3:3.9:1.
Blanc fixe part, mica powder, silica weight ratio be 2:1:1.
The preparation method of corrosion resistant powder coating includes: to be uniformly mixed each component in raw material, heating melting, is squeezed out molten
Melt mixture, after molten mixture is cooling, is crushed, is ground up, sieved to obtain the corrosion resistant powder coating that partial size is 490 mesh.
Embodiment 6
A kind of processing technology improving plastic-coated steel corrosion resistance, comprising the following steps:
S1, blasting treatment is carried out to stainless-steel pipe, steel pipe inner wall surface derusting grade is made to reach Sa2.5 grades；
S2, steel pipe after derusting is preheated, is preheated to 210 DEG C, then in the corrosion-resistant of steel pipe inner wall surface spraying embodiment 1
Powdery paints, forms corrosion-resistant finishes after melted by heating, corrosion-resistant finishes with a thickness of 0.42 millimeter；
S3, the steel pipe of coated corrosion resistant powder coating is placed 35 minutes, keeps corrosion resistant powder coating and steel tube surface abundant
Contact；
S4, solidification advection is carried out, the temperature for solidifying advection is 186 DEG C, obtains the high plastic-coated steel of corrosion resistance.
Embodiment 7
A kind of processing technology improving plastic-coated steel corrosion resistance, comprising the following steps:
S1, blasting treatment is carried out to seamless steel pipe, outer wall of steel pipe surface derusting grade is made to reach Sa2.5 grades；
S2, steel pipe after derusting is preheated, is preheated to 204 DEG C, then coat the corrosion-resistant powder of embodiment 2 on outer wall of steel pipe surface
Last coating, forms corrosion-resistant finishes after melted by heating, corrosion-resistant finishes with a thickness of 0.46 millimeter；
S3, the steel pipe of coated corrosion resistant powder coating is placed 50 minutes, keeps corrosion resistant powder coating and steel tube surface abundant
Contact；
S4, solidification advection is carried out, the temperature for solidifying advection is 192 DEG C, obtains the high plastic-coated steel of corrosion resistance.
Embodiment 8
A kind of processing technology improving plastic-coated steel corrosion resistance, comprising the following steps:
S1, blasting treatment is carried out to welded still pipe, the inside and outside wall surface derusting grade of steel pipe is made to reach Sa2.5 grades；
S2, steel pipe after derusting is preheated, is preheated to 217 DEG C, then coat 3 corrosion resistant of embodiment in the inside and outside wall surface of steel pipe
Lose powdery paints, form corrosion-resistant finishes after melted by heating, corrosion-resistant finishes with a thickness of 0.33 millimeter；
S3, the steel pipe of coated corrosion resistant powder coating is placed 45 minutes, keeps corrosion resistant powder coating and steel tube surface abundant
Contact；
S4, solidification advection is carried out, the temperature for solidifying advection is 183 DEG C, obtains the high plastic-coated steel of corrosion resistance.
Embodiment 9
A kind of processing technology improving plastic-coated steel corrosion resistance, comprising the following steps:
S1, blasting treatment is carried out to seamless steel pipe, steel pipe inner wall surface derusting grade is made to reach Sa2.5 grades；
S2, steel pipe after derusting is preheated, is preheated to 185 DEG C, then coat the corrosion-resistant powder of embodiment 4 on steel pipe inner wall surface
Last coating, forms corrosion-resistant finishes after melted by heating, corrosion-resistant finishes with a thickness of 0.38 millimeter；
S3, the steel pipe of coated corrosion resistant powder coating is placed 35 minutes, keeps corrosion resistant powder coating and steel tube surface abundant
Contact；
S4, solidification advection is carried out, the temperature for solidifying advection is 190 DEG C, obtains the high plastic-coated steel of corrosion resistance.
Embodiment 10
A kind of processing technology improving plastic-coated steel corrosion resistance, comprising the following steps:
S1, blasting treatment is carried out to stainless-steel pipe, outer wall of steel pipe surface derusting grade is made to reach Sa2.5 grades；
S2, steel pipe after derusting is preheated, is preheated to 240 DEG C, then coat the corrosion-resistant powder of embodiment 5 on outer wall of steel pipe surface
Last coating, forms corrosion-resistant finishes after melted by heating, corrosion-resistant finishes with a thickness of 0.48 millimeter；
S3, the steel pipe of coated corrosion resistant powder coating is placed 40 minutes, keeps corrosion resistant powder coating and steel tube surface abundant
Contact；
S4, solidification advection is carried out, the temperature for solidifying advection is 195 DEG C, obtains the high plastic-coated steel of corrosion resistance.
It is of the present invention to be applied to state of the art, spray coating method is selected in embodiment.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of processing technology for improving plastic-coated steel corrosion resistance, which comprises the following steps:
S1, blasting treatment is carried out to steel pipe, steel tube surface derusting grade is made to reach Sa2.5 grades；
S2, steel pipe after derusting is preheated, is preheated to 180-250 DEG C, then coat corrosion resistant powder coating in steel tube surface,
Corrosion-resistant finishes is formed after melted by heating；
S3, the steel pipe of coated corrosion resistant powder coating is placed 30-50 minutes, fills corrosion resistant powder coating with steel tube surface
Tap touching；
S4, solidification advection is carried out, obtains the high plastic-coated steel of corrosion resistance.
2. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 1, which is characterized in that described resistance to
The raw material of corrosion resistant powder coating includes: 50-60 parts of bisphenol A type epoxy resin, 30-40 parts of novolac epoxy resin, satisfies by weight
With 5-10 parts of polyester resin, 8-12 parts of blanc fixe part, 6-10 parts of mica powder, 4-7 parts of silica, modified aluminium triphosphate 4-
7 parts, 10-13 parts of phenols curing agent, 1-2 parts of 788 levelling agent, 0.3-0.4 parts of styrax, 0.5-0.6 parts of imidazoles.
3. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 2, which is characterized in that described resistance to
In the raw material of corrosion resistant powder coating, bisphenol A type epoxy resin, novolac epoxy resin, saturated polyester resin weight ratio be 6.5-
9.5:4-6.5:1。
4. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 2, which is characterized in that described resistance to
In the raw material of corrosion resistant powder coating, blanc fixe part, mica powder, silica weight ratio be 1.6-2.3:1.4-1.8:1.
5. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 1, which is characterized in that described resistance to
The partial size of corrosion resistant powder coating is 400-500 mesh.
6. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 1, which is characterized in that described resistance to
Corrosion resistant coating with a thickness of 0.3-0.5 millimeters.
7. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 1, which is characterized in that the S2
It is middle that steel pipe after derusting is preheated to 200-220 DEG C.
8. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 1, which is characterized in that described solid
The temperature for changing advection is 180-200 DEG C.
9. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 1, which is characterized in that the steel
Pipe surface is steel pipe inner wall surface and/or outer wall of steel pipe surface.
10. a kind of processing technology for improving plastic-coated steel corrosion resistance according to claim 1, which is characterized in that described
Steel pipe is welded still pipe, seamless steel pipe or stainless-steel pipe.
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| CN201811135875.7A CN109321093A (en) | 2018-09-28 | 2018-09-28 | A kind of processing technology improving plastic-coated steel corrosion resistance |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110624790A (en) * | 2019-09-10 | 2019-12-31 | 云南固特邦钢塑管道制造有限公司 | Spraying process of plastic-coated pipeline |
| CN110639781A (en) * | 2019-09-10 | 2020-01-03 | 云南固特邦钢塑管道制造有限公司 | Steel pipe surface treatment process |
| CN113042341A (en) * | 2021-03-01 | 2021-06-29 | 安徽壹叁高分子材料有限公司 | High-corrosion-resistance high-weather-resistance gas special pipeline multilayer powder coating process |
| WO2023087966A1 (en) * | 2021-11-17 | 2023-05-25 | 富佰新材料(浙江)有限公司 | Electrostatically spray-coated high-corrosion-resistance insulating steel rail |
| CN116273798A (en) * | 2022-09-08 | 2023-06-23 | 西北工业大学 | Seamless steel pipe with inner wall deposited with corrosion-resistant coating, composition and preparation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110624790A (en) * | 2019-09-10 | 2019-12-31 | 云南固特邦钢塑管道制造有限公司 | Spraying process of plastic-coated pipeline |
| CN110639781A (en) * | 2019-09-10 | 2020-01-03 | 云南固特邦钢塑管道制造有限公司 | Steel pipe surface treatment process |
| CN113042341A (en) * | 2021-03-01 | 2021-06-29 | 安徽壹叁高分子材料有限公司 | High-corrosion-resistance high-weather-resistance gas special pipeline multilayer powder coating process |
| WO2023087966A1 (en) * | 2021-11-17 | 2023-05-25 | 富佰新材料(浙江)有限公司 | Electrostatically spray-coated high-corrosion-resistance insulating steel rail |
| CN116273798A (en) * | 2022-09-08 | 2023-06-23 | 西北工业大学 | Seamless steel pipe with inner wall deposited with corrosion-resistant coating, composition and preparation method |
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Application publication date: 20190212 |