CN105256268A - Construction process for anticorrosion composite coating of steel structure - Google Patents
Construction process for anticorrosion composite coating of steel structure Download PDFInfo
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- CN105256268A CN105256268A CN201410330841.9A CN201410330841A CN105256268A CN 105256268 A CN105256268 A CN 105256268A CN 201410330841 A CN201410330841 A CN 201410330841A CN 105256268 A CN105256268 A CN 105256268A
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Abstract
The invention provides a construction process for an anticorrosion composite coating of a steel structure. The construction process comprises the steps of surface purification treatment, derusting by sandblast, electric arc spraying of a zinc-aluminum composite coating and sealing treatment. In the step of the electric arc spraying of the zinc-aluminum composite coating, an electric arc spraying gun is adopted, an electric arc serves as the heat source, linear zinc wires with the purity being greater than or equal to 99.5% are heated to be in a molten state at first, the molten zinc is blown into mist through compressed air at the same time, and restrained grain flows are formed and are evenly sprayed on the surface of a substrate to form a zinc coating; and then linear aluminum wires with the purity being greater than or equal to 99.5% are heated to be in a molten state, the molten aluminum is blown into mist through compressed air at the same time, restrained grain flows are formed and are evenly sprayed on the surface of the zinc coating to form an aluminum coating, and the zinc coating and the aluminum coating form the zinc-aluminum composite coating. According to the construction process for the anticorrosion composite coating of the steel structure, the binding force of the anticorrosion coating and the steel structure substrate is high and up to an average of 12.0 MPa which is far beyond the national standard, thus the purpose of long-term anticorrosion can be achieved and the appearance of the structure is improved.
Description
Technical field
The present invention relates to steel structure surface anticorrosion, particularly relate to a kind of construction technology of anticorrosive composite coating of steel structure.
Background technology
Exposing the metal construction in lowered in field environment to the open air, very easily there is chemistry and electrochemical action and corrosion in its surface with surrounding environment.Therefore need at its surface-coated one deck preservative coat to protect metal construction body not by corrosion.But when metal structure surface corrosion protection coating poor-performing and damaged time, metal construction body also can be made to be exposed to outer and to produce corrosion.Metal construction building is generally large-scale permanent construction, service year limit for length, maintenance difficult, must carry out effective long-effective corrosion, to guarantee the work-ing life of buildings.
Aluminum Coating technology is from the seventies in last century since American invention, and its use range is only limitted to Japan and western countries.Enter the nineties, Aluminum Coating technology just starts to enter China.Domesticly from nineteen ninety-five, introduce production line, material therefor formula belongs to patented technology, and raw material relies on import and expensive.
Zinc-aluminium compound coating can give full play to the sacrificing protection effect of spelter coating and the Isolated Shield effect of aluminum coating, suitably increases the thickness of compound coating, can improve coating reliability in the presence of a harsh environment and work-ing life.
Summary of the invention
Object of the present invention, exactly in order to provide a kind of construction technology that have employed the anticorrosive composite coating of steel structure of zinc-aluminium compound coating.Concrete procedure of processing of the present invention is carried out as follows:
In order to achieve the above object, present invention employs following technical scheme: a kind of construction technology of anticorrosive composite coating of steel structure, comprise surface cleaning process and derusting by sandblast; Be characterized in, also comprise the electric arc zn spraying aluminium composite bed after being arranged on derusting by sandblast and sealing treatment; Described electric arc zn spraying aluminium composite bed adopts arc pistol, take electric arc as thermal source, first the wire zinc silk of purity >=99.5% is heated to molten state, with pressurized air, the zinc of melting is blown out vaporific simultaneously, and form affined grain flow, even application forms one deck zinc layers at matrix surface, again the wire aluminium wire of purity >=99.5% is heated to molten state, with pressurized air, the aluminium of melting is blown out vaporific simultaneously, and form affined grain flow, even application forms one deck aluminium lamination on zinc layers surface, and aluminium lamination forms zinc-aluminium composite bed together with zinc layers; Described sealing treatment is first on zinc-aluminium composite bed
Rear spraying one priming paint, at least one intermediate coat with together with finish paint.
During described electric arc zn spraying aluminium composite bed, the distance controlling of spray gun and matrix surface is at 150 ~ 200mm, and spray angle controls at 60 degree of-90 degree, and spray gun translational speed controls at 300 ~ 400mm/s, and the transfer rate of zinc silk and aluminium wire controls at 2.5 ~ 4m/min; Arc voltage controls at 24 ~ 34V, and flame current controls at 100 ~ 300A, and compressed air pressure controls at 0.5 ~ 0.6Mpa.
Described zinc layers and aluminium lamination adopt layering to spray respectively and are formed, and before spraying, the spraying direction of one deck forms 45 degree to 90 degree intersecting with the spraying direction of spraying later layer; Total zinc coating thickness controls at 110 μm ~ 130 μm, and total aluminum layer thickness controls at 90 μm ~ 110 μm; Sprayed the gauge control of the zinc-aluminium composite bed of rear formation at 210 μm ~ 230 μm, Roughness Surface on Control is in Rz30 ~ 90 μm.
Described derusting by sandblast adopts band corner angle steel sand, and sand grains size controls at 0.5-2.0mm, and sandblasting gaseous tension controls at 0.50-0.60MPa, and sandblasting distance controlling is at 100-200mm, and sandblasting Angle ambiguity is at 70 degree of-80 degree.
Described priming paint, intermediate coat and finish paint adopt high pressure airless spraying apparatus to spray respectively, and base coat thickness controls at 18-22 μm, and intermediate coat gauge control is at 110-130 μm, and finish paint gauge control is at 90-110 μm.
Adopt the construction technology of anticorrosive composite coating of steel structure of the present invention, the bonding force of its corrosion protection coating and steel construction matrix is strong, on average reaches 12.0Mpa, is much higher than national standard, can reach the object of long-effective corrosion and improve the outward appearance of structure, work-ing life can reach more than 80 years.
Embodiment
The concrete implementation step of the construction technology of anticorrosive composite coating of steel structure of the present invention is as follows:
The first step: preparatory stage
Comprise the investigation to construction environment and project scale etc., and the preparation of preparation of construction.
Second step: surface cleaning process
First check the outward appearance of steel structure surface, effects on surface have that overlap, splash, pin hole, overlap and burr are lofty, welding slag etc., carry out polishing cleaning, sharp corner, is processed into the fillet of more than radius 2mm; With grease, grease, soluble salt, rust, oxide skin etc. and other dirt of the cleaning such as sanitising agent or solvent removing matrix surface.Surface treatment quality reaches drying, free from dust, without grease, without dirt, the pollution comprising solubility salt without rust staining and other, reaches GB11373-89 code requirement.
3rd step: derusting by sandblast
Sand-blasting abrasive adopts band corner angle steel sand.Sand grains size is at 0.5-2.0mm, and water ratio is less than 1%, and clean clean, meets GB11373-89 regulation (reclaiming sand will clean, dry, screen).
The pressurized air that sandblasting uses must keep clean and dry, and air compressor machine will be equipped with dehumidifying, oil removing treating plant, keeps sandblasting gaseous tension to stablize, roughly at 0.5-0.60MPa in sandblasting procedures.Sandblasting distance roughly remains within the scope of 100-200mm.Sandblasting angle should remain on 70 degree of-80 best sandblasting level of degree, and matrix roughness should increase with the increase of sandblasting angle.Derusting by sandblast reaches Sa2.5 level, and surface clearness reaches Sa2.5 level, and roughness reaches Rz40-80 μm, the optional 0.5-2.0mm size of steel sand particle.Reach GB8923-88 standard.Sandblasting environmental requirement relative humidity is less than or equal to 80%, and outdoor is forbidden in the operation of the weather such as sleet, condensation.Sandblasting envrionment temperature is higher than 5 DEG C, and basal plane actual temperature is higher than dew-point temperature 5 DEG C.
Sandblasting quality examination, adopts 223 numeric type surface roughness measuring instruments to measure.Derusting by sandblast effect reaches without rusty stain, without dirt, non-scale, without grease grease, free from dust and other pollution, matrix surface presents uniform canescence metalluster.
4th step: electric arc zn spraying aluminium composite bed 210-230 μm (wherein zinc layers 110-130 μm, aluminium lamination 90-110 μm)
Enter cleaning steel sand in workshop after sandblasting terminates, blow off steel construction working-surface dust with pressurized air, then start cleaning apparatus, carry out udst separation in workshop.
Will carry out the construction of electric arc zn spraying aluminium composite bed after the sandblasting of steel construction matrix surface as early as possible, interval time is no more than 5h, when relative humidity increases, should reduce sandblasting and the electric arc zn spraying aluminium composite bed timed interval further.Outdoor spraying is forbidden to carry out under the weather such as sleet or condensation.Matrix surface should clean drying, free from dust, without grease, without dirt, matrix surface temperature is at least high than dew-point temperature more than 3 DEG C.
Wire zinc silk, the aluminium wire of spraying, all >=99.5%, gauge or diameter of wire specification is clean in smooth surface for its purity, without scraping bits, breach, serious twist and warping and kink, non-oxidation, without grease or other pollution.Material reaches GB3190-96 standard.
The arc voltage of electric arc zn spraying aluminium composite bed controls at 24-34V, and current control is at 100-300A.Under the prerequisite that arc stability burns is safeguarded in guarantee, arc voltage suitably controls at lower level, reduces and reduce to prevent coating quality
Power supply is wasted; According to the diameter of zinc-aluminium silk and for silk speed, regulate flame current; For improving spray efficiency, reduce void content
With oxide content, improve coating quality, during spraying, high workload levels of current can be kept.Compressed air pressure should remain on 0.5-0.6MPa.Be equipped with the oil removing such as air filter, dehumidifying treating plant, gases used drying and not oily.During electric arc spraying, spray gun and steel construction matrix surface Angle ambiguity are at 60 degree to 90 degree, and distance roughly remains within the scope of 150-200mm, and the even translational speed of spray gun is at 300-400mm/s, and the transfer rate of zinc-aluminium silk is 2.5-4m/min.Spraying zinc, aluminium lamination adopt layering spraying, and the spraying direction of front one deck and later layer must be crossed as 45 degree-90 and spend, to ensure the even of coating and high-adhesion.After spray zinc, aluminium complete, Coating Surface Roughness is generally between Rz30-90 μm.In spray zinc-aluminium process, note the temperature conditions of steel structure surface, in arc spray process, matrix surface temperature must not more than 200 DEG C.Envrionment temperature should 5 DEG C of < t < 35 DEG C, and humidity is less than 80%.
Should reserve weld during electric arc spraying anticorrosive construction in steel construction source mill, width 50mm is reserved in every side, and protection pasted by blend compounds band paper.
5th step: quality examination
Comprise visual inspection, thickness inspection and anchoring strength of coating (bonding force).
Visual inspection requires that zinc, aluminum metal layer particle are fine and closely woven, thickness even, must not have solid impurity, bubble, hole, crack etc.
Thickness checks according to regulations such as GB/T9793-87, GB4956-85.Coat-thickness uses magnetic-type gage to detect, and measure 10 points for every 100 square metres, measuring point is random.(metallographic method also can be adopted to measure).
Porosity inspection adopts chemical reaction method: first clear up coatingsurface and carry out drying, then covering 5-10 minute on sprayed coating with the filter paper being soaked with 10 grams per liter potassium cyanide and 20 grams per liter sodium chloride solutions, observes filter paper and whether occurs locus coeruleus point; Area of detection should not be less than 3% of the total area, carries out according to SJ1280 standard.
Bonding strength detects carries out according to GB9794-88, GB8642-86 standard and regulation, and coating binding force should be greater than 9.8Mpa in general.
6th step: sealing treatment (spraying is closed 20 μm together, anti-corrosion priming paint, epoxy micaceous iron coating intermediate coat twice 120 μm, is coated with polyurethane finish paint 100 μm together)
After spray zinc, aluminium (coated porous gap), seal coat to be brushed in time.The timed interval must not more than 5h.
After sealing treatment, certain set time should be had, ensure that coating is done solid work, without holiday, no sag, without bubbling, pollution-free impurity, thickness, sticking power meet the requirements.
7th step: quality examination
Comprise (see the 5th steps) such as visual inspection, thickness inspection and anchoring strength of coating (bounding force).
8th step: site clearing, completion
The major equipment used in present invention process comprises: air compressor machine, spray gun, water-and-oil separator, ventilation installation, power supply, high pressure airless spray equipment, dehumidifier, gas blower, stirrer, viscometer, dry humidity instrument, thickness tester, sticking power testing tool and air cleaning unit etc.
The compound coating adopting method of the present invention to obtain and the bonding force of steel construction matrix on average can reach 12.0Mpa, higher than national standard, reach more than 80 years work-ing life.
Certainly, above-mentioned explanation is not limitation of the present invention, the present invention is also not limited to above-mentioned citing, those skilled in the art, in essential scope of the present invention, the change made, remodeling, add or replace, the technician that should belong to the industry of the present invention should understand, the present invention is not restricted to the described embodiments, what describe in above-described embodiment and specification sheets just illustrates principle of the present invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. a construction technology for anticorrosive composite coating of steel structure, comprises surface cleaning process and derusting by sandblast; It is characterized in that: also comprise the electric arc zn spraying aluminium composite bed after being arranged on derusting by sandblast and sealing treatment; Described electric arc zn spraying aluminium composite bed adopts arc pistol, take electric arc as thermal source, first the wire zinc silk of purity >=99.5% is heated to molten state, with pressurized air, the zinc of melting is blown out vaporific simultaneously, and form affined grain flow, even application forms one deck zinc layers at matrix surface, again the wire aluminium wire of purity >=99.5% is heated to molten state, with pressurized air, the aluminium of melting is blown out vaporific simultaneously, and form affined grain flow, even application forms one deck aluminium lamination on zinc layers surface, and aluminium lamination forms zinc-aluminium composite bed together with zinc layers; Described sealing treatment be on zinc-aluminium composite bed successively spraying one priming paint, at least one intermediate coat with together with finish paint.
2. the construction technology of anticorrosive composite coating of steel structure as claimed in claim 1, it is characterized in that: during described electric arc zn spraying aluminium composite bed, the distance controlling of spray gun and matrix surface is at 150 ~ 200mm, spray angle controls at 60 degree of-90 degree, spray gun translational speed controls at 300 ~ 400mm/s, and the transfer rate of zinc silk and aluminium wire controls at 2.5 ~ 4m/min; Arc voltage controls at 24 ~ 34V, and flame current controls at 100 ~ 300A, and compressed air pressure controls at 0.5 ~ 0.6Mpa.
3. the construction technology of anticorrosive composite coating of steel structure as claimed in claim 1, it is characterized in that: described zinc layers and aluminium lamination adopt layering to spray respectively and formed, before spraying, the spraying direction of one deck forms 45 degree to 90 degree intersecting with the spraying direction of spraying later layer; Total zinc coating thickness controls at 110 μm ~ 130 μm, and total aluminum layer thickness controls at 90 μm ~ 110 μm; Sprayed the gauge control of the zinc-aluminium composite bed of rear formation at 210 μm ~ 230 μm, Roughness Surface on Control is in Rz30 ~ 90 μm.
4. the construction technology of anticorrosive composite coating of steel structure as claimed in claim 1, it is characterized in that: described derusting by sandblast adopts band corner angle steel sand, sand grains size controls at 0.5-2.0mm, sandblasting gaseous tension controls at 0.50-0.60MPa, sandblasting distance controlling is at 100-200mm, and sandblasting Angle ambiguity is at 70 degree of-80 degree.
5. the construction technology of anticorrosive composite coating of steel structure as claimed in claim 1, it is characterized in that: described priming paint, intermediate coat and finish paint adopt high pressure airless spraying apparatus to spray respectively, base coat thickness controls at 18-22 μm, intermediate coat gauge control is at 110-130 μm, and finish paint gauge control is at 90-110 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410330841.9A CN105256268A (en) | 2014-07-14 | 2014-07-14 | Construction process for anticorrosion composite coating of steel structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410330841.9A CN105256268A (en) | 2014-07-14 | 2014-07-14 | Construction process for anticorrosion composite coating of steel structure |
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| CN105256268A true CN105256268A (en) | 2016-01-20 |
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| CN201410330841.9A Withdrawn CN105256268A (en) | 2014-07-14 | 2014-07-14 | Construction process for anticorrosion composite coating of steel structure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107385173A (en) * | 2017-07-31 | 2017-11-24 | 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 |
| CN107475658A (en) * | 2017-07-11 | 2017-12-15 | 深圳仕上电子科技有限公司 | The electric arc combined coat processing method of solar panel processing unit (plant) |
| CN108355939A (en) * | 2018-03-26 | 2018-08-03 | 重庆搏成防腐工程有限公司 | Steel structure surface anticorrosive construction technique based on laser technology |
| CN109972071A (en) * | 2019-05-15 | 2019-07-05 | 宁波大智机械科技股份有限公司 | A kind of spray equipment and application have the thermal jet Zn system of the spraying zinc device |
| CN110586443A (en) * | 2019-08-16 | 2019-12-20 | 江苏海力风电设备科技股份有限公司 | Novel onshore corrosion prevention process for wind power tower cylinder |
| CN111019177A (en) * | 2019-12-31 | 2020-04-17 | 江苏祥邦建筑新材料科技有限公司 | Waterproof sound insulation pad and manufacturing method thereof |
| CN111074196A (en) * | 2019-12-05 | 2020-04-28 | 江苏吉鑫风能科技股份有限公司 | Cathode protection spraying process for offshore wind power equipment and cathode protection coating |
| CN111826600A (en) * | 2020-07-02 | 2020-10-27 | 宁波大智机械科技股份有限公司 | Intelligent hot zinc spraying device |
| CN112981302A (en) * | 2021-02-05 | 2021-06-18 | 中国人民解放军63796部队 | Site construction process of steel structure anticorrosion composite coating in south sea atmospheric environment |
| CN114763596A (en) * | 2022-03-15 | 2022-07-19 | 苏州盈孚新材料科技有限公司 | Spraying method for bridge or steel structure |
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2014
- 2014-07-14 CN CN201410330841.9A patent/CN105256268A/en not_active Withdrawn
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107475658A (en) * | 2017-07-11 | 2017-12-15 | 深圳仕上电子科技有限公司 | The electric arc combined coat processing method of solar panel processing unit (plant) |
| CN107385173A (en) * | 2017-07-31 | 2017-11-24 | 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 |
| 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 |
| CN108355939A (en) * | 2018-03-26 | 2018-08-03 | 重庆搏成防腐工程有限公司 | Steel structure surface anticorrosive construction technique based on laser technology |
| CN108355939B (en) * | 2018-03-26 | 2021-06-08 | 重庆搏成防腐工程有限公司 | Steel structure surface anticorrosion construction process based on laser technology |
| CN109972071A (en) * | 2019-05-15 | 2019-07-05 | 宁波大智机械科技股份有限公司 | A kind of spray equipment and application have the thermal jet Zn system of the spraying zinc device |
| CN110586443A (en) * | 2019-08-16 | 2019-12-20 | 江苏海力风电设备科技股份有限公司 | Novel onshore corrosion prevention process for wind power tower cylinder |
| CN111074196A (en) * | 2019-12-05 | 2020-04-28 | 江苏吉鑫风能科技股份有限公司 | Cathode protection spraying process for offshore wind power equipment and cathode protection coating |
| CN111019177A (en) * | 2019-12-31 | 2020-04-17 | 江苏祥邦建筑新材料科技有限公司 | Waterproof sound insulation pad and manufacturing method thereof |
| CN111826600A (en) * | 2020-07-02 | 2020-10-27 | 宁波大智机械科技股份有限公司 | Intelligent hot zinc spraying device |
| CN112981302A (en) * | 2021-02-05 | 2021-06-18 | 中国人民解放军63796部队 | Site construction process of steel structure anticorrosion composite coating in south sea atmospheric environment |
| CN114763596A (en) * | 2022-03-15 | 2022-07-19 | 苏州盈孚新材料科技有限公司 | Spraying method for bridge or steel structure |
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Application publication date: 20160120 |