CN101602043B - Method for carrying out outer anticorrosion on DN3600 buried steel tube by adopting molten epoxy powder - Google Patents
Method for carrying out outer anticorrosion on DN3600 buried steel tube by adopting molten epoxy powder Download PDFInfo
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- CN101602043B CN101602043B CN2009101420998A CN200910142099A CN101602043B CN 101602043 B CN101602043 B CN 101602043B CN 2009101420998 A CN2009101420998 A CN 2009101420998A CN 200910142099 A CN200910142099 A CN 200910142099A CN 101602043 B CN101602043 B CN 101602043B
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Abstract
The invention relates to a method for carrying out outer anticorrosion on a DN3600 buried steel tube by adopting molten epoxy powder, and belongs to the field of anticorrosion of tube materials. A coating process comprises material loading, preheating of the outer surface of the steel tube, deep shot blasting and derusting, superlarge power medium-frequency heating, powder spraying and coating and water cooling. Aiming at the characteristics of large diameter and extremely-small rate of the wall thickness to the diameter of a large-diameter buried steel tube with DN3600 millimeter and more than DN3600 millimeter, the method optimizes the whole machining process, controls the velocity of temperature rising, heating and cooling through the control of a moving speed of the steel tube, ensures the coating environment and the coating effect of the steel tube and the adhesion effect of a coating layer and ensures that the quality of an outer anticorrosive coating layer of the large-diameter buried steel tube meets the relevant quality acceptance standards of the state.
Description
Technical field
The invention belongs to the anticorrosion field of tubing, relate in particular to a kind of outer anti-corrosion method that is used for the major diameter buried steel pipe.
Background technology
In order to prevent that buried steel pipe does not receive the corrosion oxidation of underground moisture and various chemical substances, prolong the service life of steel pipe, add overcoat in the steel pipe outside, in order to isolated or mask erosion environment.Wherein, apply the pitch anticorrosive coat, with epoxy powder spraying outer surface of steel tube with adopt means of defences such as three PE are anticorrosion, be widely used.
The epoxy powder anti-corrosion method; Be that epoxy resin is added auxiliary agent and curing agent dry solidification, be ground into powder then, again on the steel pipe through the spraying of the above temperature of 150 degree, after being solidificated in impeller blasting; The anticorrosive coat of forming 350 to 400 microns is universally acknowledged a kind of extraordinary corrosion-inhibiting coating.The transnational oil pipeline of many in the world long distances promptly is to adopt this kind method anticorrosion, but the pliability of this anticorrosive coat is not good enough, and extremely thin, is afraid of very much the more areas of subsurface rock layer such as mountain region, and anticorrosive coat is put wound by the collision of admant piece easily, causes anticorrosion hidden danger.
Along with the raising day by day of development and national economy and living standards of the people, the large diameter steel pipe pipeline is meant the steel pipe that the DN2000 millimeter is above especially, is used to just more and more in the construction of diversion works.
The outer antiseptic property of metallic conduit is the principal element in decision life-span; The buried pipeline that China lays at present is permanent pipeline mostly; Provisional pipeline seldom; How to guarantee that the investment of huge pipeline given play to the longest maximum benefit, the important step that the anticorrosion of pipeline has just become tubing can not be ignored.
Open day is May 23 calendar year 2001, and publication number is to disclose a kind of " application of epoxy powder in corrosion-resistant technology for buried steel pipe " in the Chinese invention patent application of CN 1295891A, its with the epoxy double antiseptic powder as sprayed on material; Before the enforcement thermal spraying of buried steel pipe surface; Steel tube surface needs chemical deoiling and degreasing, defocuses, physics process such as derust, and spraying coating process is except that identical with general spraying principle; Need steel pipe is carried out heating in medium frequency; Make steel tube surface be warming up to 250 ℃, when the spraying epoxy powder, the steel pipe temperature rise control is between 210-230 ℃.
The day for announcing is on August 16th, 2006; Notification number is in the Chinese invention patent of CN1818232C; Disclose a kind of " clinkery epoxy powder outer anticorrosive coating steel pipe and coated technique ", its steel pipe that will make steel-pipe pile is divided into 4 active sections, and steel pipe is through preheating, rust cleaning, dedusting; High-power again heating removes naked section L
0Outward, on whole steel pipe length L with the epoxy powder bottom of dust gun coating thickness 300～600 μ m, in the first coating gel time to L
1+ L
2The intermediate layer of section coating thickness 600～1000 μ m, in the second coating gel time to the wave section of spattering L
1Coating thickness is at the epoxy powder surface layer of 800～1000 μ m, and each interlayer has good compatibility, through gel, be solidified into continuously compound outer anticorrosive coating steel pipe, but to the coated steel pipe cooling, carries out quality testing after being cooled to room temperature through water-cooled.
But; Technique scheme only can be applicable to mostly below the DN2000 millimeter in, minor-diameter steel-tube; For the large diameter steel pipe (for example, the major diameter pushing tow steel pipe that the DN3600 millimeter that uses in certain city's water supply project is above) that surpasses more than the DN2000 millimeter, because its diameter is big; Cause the wall thickness/diameter ratio of steel pipe minimum; And then bring a series of problem at aspects such as heating, powder spraying, insulation, coolings, and talk about if carry out outer corrosion-resistant more according to the method described above, implement and have a lot of difficulties; Finally can cause the aspect quality defects such as adhesive force, thickness, the uniformity of outer anticorrosive coating, can't produce the product that meets code requirement.
Summary of the invention
Technical problem to be solved by this invention provide a kind of employing melt the knot epoxy powder DN3600 buried steel pipe is carried out outer preserving method; It is to DN3600 millimeter and above big, the minimum characteristics of wall thickness/diameter ratio of major diameter buried steel pipe diameter of DN3600 millimeter; Carried out process optimization, guaranteed that the quality of major diameter buried steel pipe outer anticorrosive coating meets the relevant quality acceptance standard of country.
Technical scheme of the present invention is: provide a kind of employing to melt the knot epoxy powder DN3600 buried steel pipe is carried out outer preserving method, it is characterized in that: the epoxy double antiseptic powder is sprayed on DN3600 buried steel pipe surface with the static plasma spray technology, as corrosion prevention film.
Described employing is melted the knot epoxy powder DN3600 buried steel pipe is carried out outer preserving method, comprises the epoxy powder coated technique to steel pipe, it is characterized in that described coated technique comprises at least:
1) material loading: will weld good DN3600 steel pipe and hang on the translation dolly, and be transported to the initiating terminal of production line with crane;
2) outer surface of steel tube preheating: through the blower fan thermal cycle moisture is driven away in the steel pipe preheating with burner, heating-up temperature is 40 ℃～60 ℃;
3) degree of depth impeller blasting: remove the oxide skin of steel tube surface, derusting grade reaches the Sa2.5 level, depth of abrasion pattern 40～100 μ m;
4) super high power heating in medium frequency: adopt the heating of dual IF coil vortex induction, make the thick steel pipe thermally equivalent of heavy caliber 34mm, it is temperature required to rise to technology;
5) powder spraying: through electrostatic gun, make the epoxy powder particle after the abundant fluidisation electronegative, stick to preheated steel pipe surface melted by heat uniformly and flow, further levelling covers whole steel tube surface, and coating and steel pipe are combined closely;
6) water-cooled: adopt the cooling system of two big flows, the steel pipe of band coating is lowered the temperature, its cooling water inflow is 400 cubic metres/hour, guarantees out that the pipe temperature is not more than 100 ℃.
Further, when said outer surface of steel tube preheating, the body temperature is greater than 3 ℃ of dew points.
Its described super high power heating in medium frequency, the super high power intermediate frequency heater of two 1000KW of employing, the Control of Voltage of its preceding intermediate frequency heater is controlled at more than 110～130 ℃ in 600V, power 750KW, steel pipe temperature; Thereafter the Control of Voltage of intermediate frequency heater is controlled at more than 220～240 ℃ in 520V, power 450KW, steel pipe temperature; Firing rate is 0.2～0.23 meter/minute.
Its described powder spraying uses 12 spray gun; Be divided into two groups around the steel pipe circumference; Interval between two groups of spray guns is less than or equal to per minute steel pipe forward travel distance, and is through regulating the spray parameters of spray gun, even, bright to guarantee the pipe coating surface; Reach high adhesion force, high abrasion, meet each item standard add the intensity level coating, its dry film gross thickness reaches 420 μ m～520 μ m greatly.
Its described spray parameters is powder atomization 5～6m
3/ h, fluidized-bed pressure 1.8kg, electrostatic current 80 μ A, electrostatic pressure 65KV.
The application's employing is melted the knot epoxy powder DN3600 buried steel pipe is carried out outer preserving method; Through controlling the translational speed of said steel pipe; Control the speed of its intensification, heating and cooling, guarantee the adhesion effect of coating environment, coating effect and the anticorrosive coat of steel pipe.
Compare with prior art, advantage of the present invention is:
1. through the translational speed of control steel pipe, control the speed of its intensification, heating and cooling, guaranteed the adhesion effect of coating environment, coating effect and the anticorrosive coat of steel pipe;
2., wall thickness/diameter ratio minimum characteristics big to the processing object diameter are optimized whole machining process technology, have guaranteed the coating quality of major diameter buried steel pipe outer anticorrosive coating.
Description of drawings
Fig. 1 is the FB(flow block) of coated technique method of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Among Fig. 1, coated technique of the present invention comprises at least:
1) material loading: will weld good DN3600 steel pipe and hang on the translation dolly, and be transported to the initiating terminal of production line with crane;
2) outer surface of steel tube preheating: through the blower fan thermal cycle moisture is driven away in the steel pipe preheating with burner, heating-up temperature is 40 ℃～60 ℃;
3) degree of depth impeller blasting: remove the oxide skin of steel tube surface, derusting grade reaches the Sa2.5 level, depth of abrasion pattern 40～100 μ m;
4) super high power heating in medium frequency: adopt the heating of dual IF coil vortex induction, make the thick steel pipe thermally equivalent of heavy caliber 34mm, it is temperature required to rise to technology;
5) powder spraying: through electrostatic gun, make the epoxy powder particle after the abundant fluidisation electronegative, stick to preheated steel pipe surface melted by heat uniformly and flow, further levelling covers whole steel tube surface, and coating and steel pipe are combined closely;
6) water-cooled: adopt the cooling system of two big flows, the steel pipe of band coating is lowered the temperature, its cooling water inflow is 400 cubic metres/hour, guarantees out that the pipe temperature is not more than 100 ℃.
In order to improve and to guarantee processing effect, the characteristics big to the processing object diameter, that tube wall is thin, when reality is processed, still need and pay special attention to following operation or problem:
Further, when said outer surface of steel tube preheating, the body temperature is greater than 3 ℃ of dew points.
Its described super high power heating in medium frequency, the super high power intermediate frequency heater of two 1000KW of employing, the Control of Voltage of its preceding intermediate frequency heater is controlled at more than 110～130 ℃ in 600V, power 750KW, steel pipe temperature; Thereafter the Control of Voltage of intermediate frequency heater is controlled at more than 220～240 ℃ in 520V, power 450KW, steel pipe temperature; Firing rate is 0.2～0.23 meter/minute.
Its described powder spraying uses 12 spray gun; Be divided into two groups around the steel pipe circumference; Interval between two groups of spray guns is less than or equal to per minute steel pipe forward travel distance, and is through regulating the spray parameters of spray gun, even, bright to guarantee the pipe coating surface; Reach high adhesion force, high abrasion, meet each item standard add the intensity level coating, its dry film gross thickness reaches 420 μ m～520 μ m greatly.
Its described spray parameters is powder atomization 5～6m
3/ h, fluidized-bed pressure 1.8kg, electrostatic current 80 μ A, electrostatic pressure 65KV.
Its big flow cooling system is that cooling water inflow is 400 cubic metres/hour a big flow cooling system, and the steel pipe of band coating is lowered the temperature.
At the outer surface of steel tube warm-up phase, through the translational speed of control steel pipe through burner, the heating rate of control steel pipe.
In the heating in medium frequency stage, pass through the translational speed of intermediate frequency coil or intermediate frequency heater through the heating power and the steel pipe of control intermediate frequency coil or intermediate frequency heater, control the heating rate and the duration of steel pipe.
In water cooling stage, cooling water flow and the steel pipe through the control cooling system controlled the rate of temperature fall of steel pipe through the translational speed of cooling system.
Key in the whole machining process technical process is the translational speed through the control steel pipe, controls the speed of its intensification, heating and cooling, has guaranteed the adhesion effect of coating environment, coating effect and the anticorrosive coat of steel pipe.
Produce by above-mentioned production operation processing step, through DN3600 fished pipe outer anticorrosive coating is carried out the antiseptic property verification test, test result is following, meets relevant national standard fully.
Test event unit's technical performance index testing result operative norm
Flat appearance, color and luster is even, the qualified range estimation of no bubble
Impact resistance (30 ℃) J >=1.5 2.2 SY/T0315
Bending resistance (3 ° ,-30 ℃) flawless flawless SY/T0315
Wearability (knockout method) L/ μ m >=5 5.4 SY/T0315
Adhesive force (sled strip) level 1～2 1 SY/T0315
Adhesion strength MPa >=60 90 GB/T6329
Cathodic disbonding (7 days, 65 ℃) Mm≤6.5 4.0 SY/T0315
Electrical strength MV/m >=30 40.24 GB/T1410.8
Specific insulation Ω m>=1 * 10
132.6 * 10
14GB/T1410
Section porosity level 1～2 2 SY/T0315
Interface porosity level 1～2 2 SY/T0315
Chemical-resistance distilled water % rate of body weight gain≤3% 1.2% ASTMD570-95
(60 ℃ were soaked 15 days) 3.5%NaCL % rate of body weight gain≤2% 0.8% ASTMD570-95
Owing to the present invention is directed to big, the minimum characteristics of wall thickness/diameter ratio of the above major diameter buried steel pipe diameter of DN3600 millimeter and DN3600 millimeter; Whole machining process has been carried out process optimization; Translational speed through the control steel pipe; Control the speed of its intensification, heating and cooling, guaranteed the adhesion effect of coating environment, coating effect and the anticorrosive coat of steel pipe, guaranteed that the quality of major diameter buried steel pipe outer anticorrosive coating meets the relevant quality acceptance standard of country.
The present invention can be widely used in the manufacture field of major diameter buried steel pipe outer anticorrosive coating.
Claims (4)
1. an employing is melted the knot epoxy powder DN3600 buried steel pipe is carried out outer preserving method, and it is characterized in that: the epoxy double antiseptic powder is sprayed on DN3600 buried steel pipe surface with the static plasma spray technology, and as corrosion prevention film, its coated technique comprises at least:
1) material loading: will weld good DN3600 steel pipe and hang on the translation dolly, and be transported to the initiating terminal of production line with crane;
2) outer surface of steel tube preheating: through the blower fan thermal cycle moisture is driven away in the steel pipe preheating with burner, heating-up temperature is 40 ℃～60 ℃;
3) degree of depth impeller blasting: remove the oxide skin of steel tube surface, derusting grade reaches the Sa2.5 level, depth of abrasion pattern 40～100 μ m;
4) super high power heating in medium frequency: adopt the heating of dual IF coil vortex induction, make the thick steel pipe thermally equivalent of heavy caliber 34mm, it is temperature required to rise to technology;
5) powder spraying: through electrostatic gun, make the epoxy powder particle after the abundant fluidisation electronegative, stick to preheated steel pipe surface melted by heat uniformly and flow, further levelling covers whole steel tube surface, and coating and steel pipe are combined closely;
6) water-cooled: adopt the cooling system of two big flows, the steel pipe of band coating is lowered the temperature, its cooling water inflow is 400 cubic metres/hour, guarantees out that the pipe temperature is not more than 100 ℃;
Wherein, when said outer surface of steel tube preheating, the body temperature is greater than 3 ℃ of dew points;
Its described super high power heating in medium frequency, the super high power intermediate frequency heater of two 1000KW of employing, the Control of Voltage of its preceding intermediate frequency heater is controlled at 110～130 ℃ in 600V, power 750KW, steel pipe temperature; Thereafter the Control of Voltage of intermediate frequency heater is controlled at 220～240 ℃ in 520V, power 450KW, steel pipe temperature; Firing rate is 0.2～0.23 meter/minute.
2. melt the knot epoxy powder according to the described employing of claim 1 the DN3600 buried steel pipe is carried out outer preserving method; It is characterized in that described powder spraying use 12 is spray gun; Be divided into two groups around the steel pipe circumference; Interval between two groups of spray guns is less than or equal to per minute steel pipe forward travel distance, and is through regulating the spray parameters of spray gun, even, bright to guarantee the pipe coating surface; Reach high adhesion force, high abrasion, meet each item standard add the intensity level coating, its dry film gross thickness reaches 420 μ m～520 μ m.
3. melt the knot epoxy powder according to the described employing of claim 2 the DN3600 buried steel pipe is carried out outer preserving method, it is characterized in that described spray parameters is powder atomization 5～6m
3/ h, fluidized-bed pressure 1.8kg, electrostatic current 80 μ A, electrostatic pressure 65KV.
4. melt the knot epoxy powder according to the described employing of claim 1 the DN3600 buried steel pipe is carried out outer preserving method; It is characterized in that through controlling the translational speed of said steel pipe; Control the speed of its intensification, heating and cooling, guarantee the adhesion effect of coating environment, coating effect and the anticorrosive coat of steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101420998A CN101602043B (en) | 2008-08-20 | 2009-05-27 | Method for carrying out outer anticorrosion on DN3600 buried steel tube by adopting molten epoxy powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810041895 | 2008-08-20 | ||
| CN200810041895.8 | 2008-08-20 | ||
| CN2009101420998A CN101602043B (en) | 2008-08-20 | 2009-05-27 | Method for carrying out outer anticorrosion on DN3600 buried steel tube by adopting molten epoxy powder |
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| CN101602043A CN101602043A (en) | 2009-12-16 |
| CN101602043B true CN101602043B (en) | 2012-03-07 |
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| CN103521413A (en) * | 2013-10-08 | 2014-01-22 | 番禺珠江钢管（连云港）有限公司 | On-line anticorrosive coating spraying technology for steel pipe |
| CN104889040A (en) * | 2014-03-06 | 2015-09-09 | 天津市管道工程集团有限公司 | Integrated technology for anticorrosive coatings of steel pipelines |
| CN105080769A (en) * | 2014-05-04 | 2015-11-25 | 昆山市万胜化工有限公司 | Work piece UV undercoat coating device and coating technology |
| CN105562263B (en) * | 2016-02-26 | 2017-12-15 | 安徽工业大学 | A kind of metal tube laser heating paint finishing |
| CN106700930A (en) * | 2016-12-16 | 2017-05-24 | 安徽宝恒新材料科技有限公司 | Method for enhancing seawater corrosion resistance of low-grade stainless steel |
| CN107552345A (en) * | 2017-09-29 | 2018-01-09 | 无锡昊瑜节能环保设备有限公司 | A kind of steel pipe painting method for fire-fighting |
| CN108895247A (en) * | 2018-06-13 | 2018-11-27 | 四川石油天然气建设工程有限责任公司 | Long-distance pipe Crater antiseptic application station and weld bond shrink belt operational method |
| CN112517343B (en) * | 2020-11-30 | 2022-05-17 | 宁波龙元盛宏生态建设工程有限公司 | Automatic coating and sintering epoxy powder anticorrosion process suitable for pipe jacking operation |
| CN113617576B (en) * | 2021-08-10 | 2022-12-02 | 河北钜兴智能装备制造有限公司 | Equipment and process for forming centrifugal nodular cast iron pipe plastic inner coating by adopting spraying method |
| CN116748043B (en) * | 2023-06-20 | 2024-05-03 | 杭州毕方航空技术有限公司 | Preparation system of anti-corrosion conductive coating for aviation coating |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818232A (en) * | 2006-02-23 | 2006-08-16 | 宁波科鑫腐蚀控制工程有限公司 | External corrosive-proof coating steel pipe with melt epoxy powder and coatign process thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1818232A (en) * | 2006-02-23 | 2006-08-16 | 宁波科鑫腐蚀控制工程有限公司 | External corrosive-proof coating steel pipe with melt epoxy powder and coatign process thereof |
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