CN102211083B - Automatic coating process of composite coating of large-size steel pipe - Google Patents
Automatic coating process of composite coating of large-size steel pipe Download PDFInfo
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- CN102211083B CN102211083B CN201010137515.8A CN201010137515A CN102211083B CN 102211083 B CN102211083 B CN 102211083B CN 201010137515 A CN201010137515 A CN 201010137515A CN 102211083 B CN102211083 B CN 102211083B
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- electric arc
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- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 239000011248 coating agent Substances 0.000 title claims abstract description 35
- 239000002131 composite material Substances 0.000 title claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 21
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 239000004411 aluminium Substances 0.000 claims description 22
- 239000004593 Epoxy Substances 0.000 claims description 15
- 238000010891 electric arc Methods 0.000 claims description 15
- 238000005488 sandblasting Methods 0.000 claims description 12
- 238000007590 electrostatic spraying Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 6
- 229920006334 epoxy coating Polymers 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000003822 epoxy resin Substances 0.000 abstract 4
- 229920000647 polyepoxide Polymers 0.000 abstract 4
- 230000007774 longterm Effects 0.000 abstract 3
- 239000007921 spray Substances 0.000 abstract 2
- 238000000746 purification Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000004519 grease Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention provides an automatic coating process of a composite coating of a large-size steel pipe, comprising the following steps of: surface purification treatment, derusting by sandblast, arc aluminum spray, electrostatic epoxy resin powder spraying, and the like, wherein the thickness of an aluminum coating achieves 80-120 micrometers, and the thickness of an epoxy resin coating achieves 160-220 micrometers. According to the method disclosed by the invention, the composite coating combined by the aluminum coating and the epoxy resin coating is formed on the surface of the large-size steel pipe by combining the arc aluminum spray with the electrostatic epoxy resin powder spraying; the composite coating not only retains the excellent properties of a single coating, but also combines the characteristics of the sealing action of an arc spraying coating and the long-term protection of a cathode, has an anticorrosion coating having high binding power with the surface of the large-size steel pipe, which averagely reaches 12.0 MPa, service life more than 80 years and intermediate-frequency heating step saving, has the advantages of water resistance, impact resistance, weather resistance, environment friendliness, long-term protection, and the like, can achieve the purpose of long-term anticorrosion, also improves the structural appearance and is mainly used for the large-size steel pipe which has higher requirements for anticorrosion.
Description
Technical field
The present invention relates to steel structure surface anticorrosion, relate in particular to a kind of automatic coating process of large-scale steel pipe composite coating.
Background technology
In recent years, along with the fast development of Chinese national economy, increasing large-scale steel pipe is applied to port and pier, ocean engineering and municipal works.In order effectively to control the corrosion of large-scale steel pipe, extend the service life of large-scale steel pipe, guarantee the safe operation of infrastructure, need to carry out surface anticorrosion processing to steel pipe.The method for anticorrosion treatment the most often using is the external coating anticorrosive paint at steel pipe, as artificial application, melting epoxy powder automatic coating etc.Wherein, artificial application is containing organic solvent, and painting effect is poor, and needs harsh environmental condition; Melting epoxy powder automatic coating process contains the high temperature heating in medium frequency stage, and power consumption is large, is unfavorable for energy-conserving and environment-protective.
Summary of the invention
Object of the present invention, exactly in order to provide a kind of automatic coating process of large-scale steel pipe composite coating of energy-conserving and environment-protective.
In order to achieve the above object, the present invention has adopted following technical scheme: a kind of automatic coating process of large-scale steel pipe composite coating, by an automatic application product line, undertaken, and comprise the following steps:
(1) will by inlet pipe platform, be transported to rust remover through surface cleaning steel pipe after treatment and carry out totally enclosed surface sand-blasting rust cleaning, and make final derusting by sandblasting standard reach Sa3 level;
(2) steel pipe after derusting by sandblasting is sent to electric arc aluminium spraying device and carries out electric arc aluminium spraying, make aluminized coating thickness reach 80-120 μ m;
(3) steel pipe after electric arc aluminium spraying is sent to epoxy powder electrostatic spraying apparatus and carries out epoxy powder electrostatic spraying, make epoxy coating thickness reach 160-220 μ m;
(4) steel pipe after epoxy powder electrostatic spraying being sent to water-cooling system carries out after cooling or naturally cooling exporting by going out pipe platform.
Described electric arc aluminium spraying adopts wire aluminium wire, and aluminium wire diameter is 2.0～3.0mm, aluminium purity >=99.5%; Coating surface roughness after aluminium-plated completing is controlled at Rz40～90 μ m.
Described derusting by sandblasting adopts band corner angle steel sand, and sand grains size is controlled at 0.5-2.0mm, and sandblast gas pressure is controlled at 0.50-0.60MPa.
Electric arc aluminium spraying is take electric arc as thermal source; aluminium wire sprayed on material is heated to melting (fusing) state; with compressed air, molten metal is blown out vaporific simultaneously; and form affined grain flow; impact on matrix surface, be out of shape rapidly, be stretched flat, cooling, be tightly attached on matrix surface; after constantly even jet-stacking, form the method for spraying protective layer.
Epoxy powder electrostatic spraying apparatus comprises fluid bed, containing powder spraying chamber and the recovery system of electrostatic gun.Epoxy powder is abundant fluidisation in fluid bed first, then, by electrostatic gun, makes powder particle electronegative, sticks to uniformly the steel surface through preheating of ground connection.
The automatic coating process of large-scale steel pipe composite coating of the present invention, adopt electric arc aluminium spraying to combine with epoxy powder electrostatic spraying, on large-scale steel pipe surface, form the composite coating being combined into by aluminized coating and epoxy coating, this composite coating had both kept the premium properties of single coating, combine again the feature of sealing process and the negative electrode long-effective protection of electric arc spraying layer, the adhesion of its corrosion-inhibiting coating and steel tube surface is strong, on average reach 12.0MPa, be much higher than national standard, service life is more than 80 years, saved heating in medium frequency step simultaneously, coating is thinner and corrosion resistance is stronger, have water-fast, shock-resistant, weather-proof, the feature such as environmental protection and long-effective protection, can reach the object of long-effective corrosion and improve the outward appearance of structure, be mainly used in the large-scale steel pipe with higher requirement for anticorrosion.
Accompanying drawing explanation
Fig. 1 is the structural representation of the automatic application product line that adopts of the automatic coating process of large-scale steel pipe composite coating of the present invention.
The specific embodiment
As shown in Figure 1, the concrete steps of the automatic coating process below in conjunction with Fig. 1 to large-scale steel pipe composite coating of the present invention are described as follows the automatic application product line that the automatic coating process of large-scale steel pipe composite coating of the present invention adopts:
First check the outward appearance on construction object (as steel pipe or other steel construction) surface, effects on surface has that overlap, splash, pin hole, overlap and burr are lofty, welding slag etc., the cleaning of polishing, and sharp corner, is processed into fillet more than radius 2mm; With cleanings such as cleaning agent or solvents, remove grease, grease, soluble-salt, rust, oxide skin of matrix surface etc. and other dirt.That surface treatment quality reaches is dry, free from dust, without grease, without dirt, without rust staining and other pollution including solubility salt.
Then will by inlet pipe platform 1, be transported to rust remover 2 through surface cleaning steel pipe after treatment and carry out totally enclosed surface sand-blasting rust cleaning.Sand-blasting abrasive adopts band corner angle steel sand.Sand grains size is controlled at 0.5-2.0mm, and moisture content is less than 1%, and clean clean.It is clean and dry that the compressed air that sandblast is used must keep, and air compressor machine will be equipped with dehumidifying, oil removing cleaning equipment, keeps sandblast gas pressure stable, roughly at 0.5-0.60MPa in sandblast process.Make final derusting by sandblasting standard reach Sa3 level, roughness reaches Rz60-100 μ m.
And then the steel pipe after derusting by sandblasting is sent to electric arc aluminium spraying device 3 and carries out electric arc aluminium spraying, make aluminized coating thickness reach 80-120 μ m; The wire aluminium wire of spraying use, aluminium purity>=99.5%, gauge or diameter of wire exists
smooth surface is clean, without scraping bits, breach, seriously twisting and warping and twist together, and non-oxidation, without grease or other pollution.After aluminium-plated completing, aluminized coating surface roughness is generally between the μ m of Rz40～90.
Then the steel pipe after electric arc aluminium spraying is sent to epoxy powder electrostatic spraying apparatus 4 and carries out epoxy powder electrostatic spraying, make epoxy coating thickness reach 160-220 μ m; For the powder of a small amount of diffusion, can reclaim by powder recovering device 5, can not cause dust pollution.Compared with spraying with common epoxy powder, this step can be saved heating in medium frequency, has energy-saving effect.
Finally the steel pipe after epoxy powder electrostatic spraying being sent to water-cooling system 6 carries out after cooling or naturally cooling exporting by going out pipe platform 7.Shown in Fig. 1,8,9 is deduster, and 10 is switch board, and 11 is preheating intermediate frequency.
Claims (2)
1. an automatic coating process for large-scale steel pipe composite coating, is undertaken by an automatic application product line, it is characterized in that: comprise the following steps:
(1) will by inlet pipe platform, be transported to rust remover through surface cleaning steel pipe after treatment and carry out totally enclosed surface sand-blasting rust cleaning, and make final derusting by sandblasting standard reach Sa3 level;
(2) steel pipe after derusting by sandblasting is sent to electric arc aluminium spraying device and carries out electric arc aluminium spraying, make aluminized coating thickness reach 80-120 μ m;
(3) steel pipe after electric arc aluminium spraying is sent to epoxy powder electrostatic spraying apparatus and carries out epoxy powder electrostatic spraying, make epoxy coating thickness reach 160-220 μ m;
(4) steel pipe after epoxy powder electrostatic spraying being sent to water-cooling system carries out after cooling or naturally cooling exporting by going out pipe platform;
Described electric arc aluminium spraying adopts wire aluminium wire, and aluminium wire diameter is 2.0～3.0mm, aluminium purity >=99.5%; Coating surface roughness after aluminium-plated completing is controlled at Rz40～90 μ m.
2. the automatic coating process of large-scale steel pipe composite coating as claimed in claim 1, is characterized in that: described derusting by sandblasting adopts band corner angle steel sand, and sand grains size is controlled at 0.5-2.0 mm, and sandblast gas pressure is controlled at 0.50-0.60 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010137515.8A CN102211083B (en) | 2010-04-01 | 2010-04-01 | Automatic coating process of composite coating of large-size steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010137515.8A CN102211083B (en) | 2010-04-01 | 2010-04-01 | Automatic coating process of composite coating of large-size steel pipe |
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| CN102211083A CN102211083A (en) | 2011-10-12 |
| CN102211083B true CN102211083B (en) | 2014-04-16 |
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| CN201010137515.8A Active CN102211083B (en) | 2010-04-01 | 2010-04-01 | Automatic coating process of composite coating of large-size steel pipe |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256435A (en) * | 2013-05-27 | 2013-08-21 | 宁波科鑫腐蚀控制工程有限公司 | Double-coating steel tube |
| CN105441859A (en) * | 2015-03-12 | 2016-03-30 | 湖南华中钢结构有限公司 | Natural gas pipe anticorrosion coating method and device thereof |
| CN105156818B (en) * | 2015-10-15 | 2017-05-17 | 玫德集团有限公司 | Galvanized plastic spraying malleable cast iron pipe fitting and preparing method thereof |
| CN105333239B (en) * | 2015-12-14 | 2018-03-06 | 宁波科鑫腐蚀控制工程有限公司 | A kind of molten bonding epocel composite steel tube and its processing method |
| CN107385173B (en) * | 2017-07-31 | 2019-04-19 | 浙江众立不锈钢管股份有限公司 | A kind of surface treatment method of Austenitic stainless steel pipe |
| CN107983611A (en) * | 2017-11-27 | 2018-05-04 | 贵州理工学院 | A kind of preparation method of gradient wear-and corrosion-resistant coating |
| CN107931076A (en) * | 2017-11-30 | 2018-04-20 | 安徽雷萨重工机械有限公司 | A kind of method for lifting clump weight surface abrasion resistance |
| CN109909853B (en) * | 2019-03-29 | 2021-01-19 | 江西宇通管道科技有限公司 | Underwater pipeline rust removal and paint spraying device |
| CN109759305B (en) * | 2019-03-29 | 2021-08-10 | 山东佰盛能源科技有限公司 | Rust removal and paint spraying method for underwater pipeline |
| CN112082043B (en) * | 2020-07-22 | 2022-06-28 | 石家庄常丰环境工程有限公司 | Pipeline anticorrosive coating and spraying method thereof |
| CN113145544A (en) * | 2021-04-30 | 2021-07-23 | 宜昌船舶柴油机有限公司 | Cleaning process for reducing salinity of surface of steel structure equipment and application |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122019A (en) * | 2007-09-06 | 2008-02-13 | 王家德 | Anticorrosion technology for composite coating of metal thermal spraying and powder coating electrostatic spraying |
| CN101428274A (en) * | 2008-12-18 | 2009-05-13 | 武汉市江夏区江南实业有限公司 | Process for manufacturing steel-plastic composite steel belt |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3108645B2 (en) * | 1997-03-26 | 2000-11-13 | 株式会社栗本鐵工所 | Corrosion-resistant coating method of iron pipe and anti-corrosion coated iron pipe |
| CN1141414C (en) * | 2000-05-18 | 2004-03-10 | 中国科学院海洋研究所 | Anticorrosion method of marine steel |
| CN101451243B (en) * | 2008-12-31 | 2011-07-27 | 江苏中矿大正表面工程技术有限公司 | Method and process of steel structure arc spraying composite corrosion proof coating system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122019A (en) * | 2007-09-06 | 2008-02-13 | 王家德 | Anticorrosion technology for composite coating of metal thermal spraying and powder coating electrostatic spraying |
| CN101428274A (en) * | 2008-12-18 | 2009-05-13 | 武汉市江夏区江南实业有限公司 | Process for manufacturing steel-plastic composite steel belt |
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