CN106811716A - The construction technology of anticorrosive composite coating of steel structure - Google Patents
The construction technology of anticorrosive composite coating of steel structure Download PDFInfo
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- CN106811716A CN106811716A CN201510848675.6A CN201510848675A CN106811716A CN 106811716 A CN106811716 A CN 106811716A CN 201510848675 A CN201510848675 A CN 201510848675A CN 106811716 A CN106811716 A CN 106811716A
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- aluminium
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- sandblasting
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention provides a kind of construction technology of anticorrosive composite coating of steel structure, including surface cleaning treatment, derusting by sandblasting, electric arc zn spraying aluminium composite bed and Seal treatment.Electric arc zn spraying aluminium composite bed therein is to use arc pistol, with electric arc as thermal source, the wire zinc silk of purity >=99.5% is first heated to molten condition, the zinc that will be melted with compressed air simultaneously is blown out vaporific, and form affined particle stream, even application forms one layer of zinc layers in matrix surface, the wire aluminium wire of purity >=99.5% is heated to molten condition again, the aluminium that will be melted with compressed air simultaneously is blown out vaporific, and form affined particle stream, even application forms one layer of aluminium lamination on zinc layers surface, and aluminium lamination constitutes zinc-aluminium composite bed together with zinc layers.Using the construction technology of anticorrosive composite coating of steel structure of the invention, its corrosion-inhibiting coating is strong with the adhesion of steel construction matrix, averagely reaches 12.0MPa, is much higher than national standard, the purpose that can reach long-effective corrosion and the outward appearance for improving structure.
Description
Technical field
The present invention relates to steel structure surface anti-corrosion, more particularly to a kind of construction technology of anticorrosive composite coating of steel structure.
Background technology
Expose the metal structure in external environment out of office to the open air, its surface easily occurs chemistry and electrochemical action and corrosion with surrounding environment.Therefore need to coat one layer of anticorrosive coat to protect metal structure body not by corrosion on its surface.But when the corrosion-inhibiting coating poor-performing of metal structure surface is damaged, metal structure body can also exposed and produces corrosion outside.The generally large-scale permanent construction of metal structure building, service year limit for length, maintenance difficult, it is necessary to carry out effective long-effective corrosion, to ensure the service life of building.
From the seventies in last century since American invention, it is only limitted to Japan and western countries to Aluminum Coating technology using scope.Into the nineties, Aluminum Coating technology just initially enters China.The country introduces production line since nineteen ninety-five, and material therefor formula belongs to patented technology, and raw material is by import and expensive.
The Isolated Shield of sacrificing protection effect and aluminized coating that zinc-aluminium composite coating can give full play to spelter coating is acted on, and the appropriate thickness for increasing composite coating can improve coating reliability and service life in the presence of a harsh environment.
The content of the invention
The purpose of the present invention, is just to provide for a kind of construction technology of the anticorrosive composite coating of steel structure for employing zinc-aluminium composite coating.Specific procedure of processing of the 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, including surface cleaning treatment and derusting by sandblasting；It is characterized in, also electric arc zn spraying aluminium composite bed and Seal treatment including being arranged on after derusting by sandblasting；Described electric arc zn spraying aluminium composite bed is to use arc pistol, with electric arc as thermal source, the wire zinc silk of purity >=99.5% is first heated to molten condition, the zinc that will be melted with compressed air simultaneously is blown out vaporific, and form affined particle stream, even application forms one layer of zinc layers in matrix surface, the wire aluminium wire of purity >=99.5% is heated to molten condition again, the aluminium that will be melted with compressed air simultaneously is blown out vaporific, and form affined particle stream, even application forms one layer of aluminium lamination on zinc layers surface, and aluminium lamination constitutes zinc-aluminium composite bed together with zinc layers；Described Seal treatment is first on zinc-aluminium composite bed
After spray one priming paint, at least one intermediate coat finish paint with together with.
, with the distance controlling of matrix surface in 150~200mm, in 60 degree -90 degree, in 300~400mm/s, the transporting velocity control of zinc silk and aluminium wire is in 2.5~4m/min for the control of spray gun translational speed for spray angle control for spray gun during described electric arc zn spraying aluminium composite bed；Arc voltage control is controlled in 0.5~0.6Mpa in 24~34V, arc current control in 100~300A, compressed air pressure.
Described zinc layers and aluminium lamination are respectively adopted layering spraying and are formed, and the spraying direction for spraying preceding layer intersects with 45 degree to 90 degree of spraying direction formation for spraying later layer；Total zinc coating thickness is controlled at 110 μm~130 μm, and total aluminum layer thickness is controlled at 90 μm~110 μm；At 210 μm~230 μm, surface roughness is controlled in Rz30~90 μm the thickness control of the zinc-aluminium composite bed formed after the completion of spraying.
Using band corner angle steel sand, in 0.5-2.0mm, in 0.50-0.60MPa, in 100-200mm, the control of sandblasting angle is in 70 degree of -80 degree for sandblasting distance controlling for the control of sandblasting gas pressure for the control of sand grains size for described derusting by sandblasting.
Described priming paint, intermediate coat and finish paint are respectively adopted high pressure airless spraying apparatus and are sprayed, and base coat thickness is controlled at 18-22 μm, and, at 110-130 μm, finish paint thickness control is at 90-110 μm for intermediate coat thickness control.
Using the construction technology of anticorrosive composite coating of steel structure of the invention, its corrosion-inhibiting coating is strong with the adhesion of steel construction matrix, averagely reaches 12.0Mpa, is much higher than national standard, the purpose that long-effective corrosion can be reached and the outward appearance for improving structure, service life was up to more than 80 years.
Specific embodiment
The specific 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
Including the investigation to construction environment and project scale etc., and construction equipment preparation.
Second step：Surface cleaning treatment
The outward appearance of steel structure surface is first checked for, there is overlap, splash, pin hole, overlap and the lofty, welding slag of burr etc. to surface, carry out polishing cleaning, sharp corner is processed into the fillet of more than radius 2mm；Grease, grease, soluble-salt, rust, oxide skin of removing matrix surface etc. and other dirts are cleaned with cleaning agent or solvent etc..Surface treatment quality reach drying, free from dust, without grease, without dirt, without rust staining and other include the pollution including solubility salt, reach GB11373-89 code requirements.
3rd step：Derusting by sandblasting
Sand-blasting abrasive is using band corner angle steel sand.In 0.5-2.0mm, moisture content is less than 1% to sand grains size, and cleaning is clean, meets GB11373-89 regulations (reclaiming sand will clean, dries, screen).
The compressed air that sandblasting is used must keep cleaning and drying, and air compressor machine will be equipped with dehumidifying, oil removing cleaning equipment, sandblasting gas pressure stabilization be kept in sandblasting procedures, substantially in 0.5-0.60MPa.Sandblasting distance is generally kept in the range of 100-200mm.Sandblasting angle should be maintained at 70 degree of -80 optimal sandblasting level of degree, and matrix roughness should increase with the increase of sandblasting angle.Derusting by sandblasting reaches Sa2.5 grades, and surface cleanness reaches Sa2.5 grades, and roughness reaches Rz40-80 μm, the optional 0.5-2.0mm sizes of steel sand particle.Reach GB8923-88 standards.Sandblasting environmental requirement relative humidity is less than or equal to 80%, and outdoor is forbidden in the weather operation such as sleet, condensation.Sandblasting environment temperature is higher than 5 DEG C, and basal plane actual temperature is higher than 5 DEG C of dew-point temperature.
Sandblasting quality testing, is measured using 223 numeric type surface roughness measuring instruments.Derusting by sandblasting effect is reached without rusty stain, without dirt, non-scale, without grease grease, free from dust and other pollutions, and matrix surface is presented uniform canescence metallic luster.
4th step：210-230 μm of electric arc zn spraying aluminium composite bed (wherein 110-130 μm of zinc layers, 90-110 μm of aluminium lamination)
Sandblasting enters workshop and clears up steel sand after terminating, and steel construction working surface dust is blown off with compressed air, dust arrester is then started, to carrying out udst separation in workshop.
The construction of electric arc zn spraying aluminium composite bed is carried out after steel construction matrix surface blasting treatment as early as possible, interval time is no more than 5h, when relative humidity increases, should further reduce sandblasting and electric arc zn spraying aluminium composite bed time interval.Outdoor spraying is forbidden to be carried 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 higher than dew-point temperature more than 3 DEG C.
The wire zinc thread of spraying, aluminium wire, >=99.5%, gauge or diameter of wire specification is smooth clean on surface for its purity, without scrapings, breach, serious twist and warping and kink, non-oxidation, without grease or other pollutions.Material reaches GB3190-96 standards.
The arc voltage of electric arc zn spraying aluminium composite bed is controlled in 24-34V, and current control is in 100-300A.On the premise of ensureing to safeguard that arc stability burns, arc voltage is suitably controlled in reduced levels, to prevent coating quality reduction and reduce
Power supply is wasted；Diameter according to zinc-aluminium silk adjusts arc current with for silk speed；To improve spray efficiency, the porosity is reduced
With oxide content, coating quality is improved, high workload levels of current can be kept during spraying.Compressed air pressure should be maintained at 0.5-0.6MPa.It is equipped with the oil removings such as air filter, dehumidifying cleaning equipment, not gases used drying and oily.Spray gun is controlled at 60 degree to 90 degree with steel construction matrix surface angle during electric arc spraying, and distance is generally kept in the range of 150-200mm, and in 300-400mm/s, the transporting velocity of zinc-aluminium silk is 2.5-4m/min to the uniform translational speed of spray gun.Spraying zinc, aluminium lamination are sprayed using layering, and preceding layer must be crossed as 45 degree of -90 degree with the spraying direction of later layer, to ensure the uniform and high-adhesion of coating.Coating Surface Roughness is general between Rz30-90 μm after the completion of spray zinc, aluminium.During spray zinc-aluminium, it should be noted that the temperature conditions of steel structure surface, matrix surface temperature must not exceed 200 DEG C in arc spray process.Environment temperature should be less than 80% in 5 DEG C of 35 DEG C of ＜ t ＜, humidity.
Welding position should be reserved in steel construction processing factory during electric arc spraying anticorrosive construction, the reserved width 50mm per side, blend compounds band paper pastes protection.
5th step：Quality testing
Including visual examination, thickness inspection and anchoring strength of coating (adhesion).
Visual examination requirement zinc, aluminum metal layer particle are fine and closely woven, thickness is uniform, must not there is solid impurity, bubble, hole, crack etc..
Thickness is checked and specified according to GB/T9793-87, GB4956-85 etc..Coating layer thickness detects that 10 points of every 100 square metres of measurements, measuring point is random using magnetic thickness tester.(can also be measured using metallographic method).
Porosity inspection uses chemical reaction method：Coating surface being cleared up first and being dried, be then covered in 5-10 minutes on sprayed coating with the filter paper for being soaked with 10 g/l of potassium cyanide and 20 g/l of sodium chloride solutions, whether observation filter paper locus coeruleus point occurs；Area of detection should not be less than the 3% of the gross area, be carried out according to SJ1280 standards.
Bond strength detection is carried out according to GB9794-88, GB8642-86 standard and regulation, and coating binding force should be greater than 9.8Mpa in general.
6th step：Seal treatment (20 μm together of spraying closing corrosion resistant primer, 120 μm of epoxy micaceous iron coating intermediate coat twice, 100 μm together of painting polyurethane finish paint)
After spray zinc, aluminium (coated porous gap), seal coat is brushed in time.Time interval must not exceed 5h.
After Seal treatment, there should be certain hardening time, it is ensured that coating does solid work, without holiday, no sag, without bubbling, pollution-free impurity, thickness, adhesive force meet the requirements.
7th step：Quality testing
Including (see the 5th steps) such as visual examination, thickness inspection and anchoring strength of coating (bonding force).
8th step：Site clearing, completion
The capital equipment used in present invention process includes：Air compressor machine, spray gun, oil water separator, ventilation equipment, power supply, high pressure airless spray equipment, dehumidifier, air blower, mixer, viscosimeter, dry humidity instrument, calibrator, adhesive force detection instrument and air cleaning unit etc..
The adhesion for adopting the composite coating and steel construction matrix being obtained by the present invention averagely can reach 12.0Mpa, and higher than national standard, service life reaches more than 80 years.
Certainly, described above is not limitation of the present invention, the present invention is also not limited to the example above, those skilled in the art, in essential scope of the invention, the change made, remodeling, addition is replaced, should all belong to the present invention it should be understood by those skilled in the art that, the present invention is not limited to the above embodiments, merely illustrating the principles of the invention described in above-described embodiment and specification, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appending claims and its equivalent thereof.
Claims (5)
1. a kind for the treatment of of construction technology of anticorrosive composite coating of steel structure, including surface cleaning and derusting by sandblasting；It is characterized in that：Also include being arranged on electric arc zn spraying aluminium composite bed and the Seal treatment after derusting by sandblasting；Described electric arc zn spraying aluminium composite bed is to use arc pistol, with electric arc as thermal source, the wire zinc silk of purity >=99.5% is first heated to molten condition, the zinc that will be melted with compressed air simultaneously is blown out vaporific, and form affined particle stream, even application forms one layer of zinc layers in matrix surface, the wire aluminium wire of purity >=99.5% is heated to molten condition again, the aluminium that will be melted with compressed air simultaneously is blown out vaporific, and form affined particle stream, even application forms one layer of aluminium lamination on zinc layers surface, and aluminium lamination constitutes zinc-aluminium composite bed together with zinc layers；Described Seal treatment is that one priming paint, at least one intermediate coat finish paint with together with are successively sprayed on zinc-aluminium composite bed.
2. the construction technology of anticorrosive composite coating of steel structure as claimed in claim 1, it is characterised in that：, with the distance controlling of matrix surface in 150~200mm, in 60 degree -90 degree, in 300~400mm/s, the transporting velocity control of zinc silk and aluminium wire is in 2.5~4m/min for the control of spray gun translational speed for spray angle control for spray gun during described electric arc zn spraying aluminium composite bed；Arc voltage control is controlled in 0.5~0.6Mpa in 24~34V, arc current control in 100~300A, compressed air pressure.
3. the construction technology of anticorrosive composite coating of steel structure as claimed in claim 1, it is characterised in that：Described zinc layers and aluminium lamination are respectively adopted layering spraying and are formed, and the spraying direction for spraying preceding layer intersects with 45 degree to 90 degree of spraying direction formation for spraying later layer；Total zinc coating thickness is controlled at 110 μm~130 μm, and total aluminum layer thickness is controlled at 90 μm~110 μm；At 210 μm~230 μm, surface roughness is controlled in Rz30~90 μm the thickness control of the zinc-aluminium composite bed formed after the completion of spraying.
4. the construction technology of anticorrosive composite coating of steel structure as claimed in claim 1, it is characterised in that：Using band corner angle steel sand, in 0.5-2.0mm, in 0.50-0.60MPa, in 100-200mm, the control of sandblasting angle is in 70 degree of -80 degree for sandblasting distance controlling for the control of sandblasting gas pressure for the control of sand grains size for described derusting by sandblasting.
5. the construction technology of anticorrosive composite coating of steel structure as claimed in claim 1, it is characterised in that：Described priming paint, intermediate coat and finish paint are respectively adopted high pressure airless spraying apparatus and are sprayed, and base coat thickness is controlled at 18-22 μm, and, at 110-130 μm, finish paint thickness control is at 90-110 μm for intermediate coat thickness control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510848675.6A CN106811716A (en) | 2015-11-30 | 2015-11-30 | The construction technology of anticorrosive composite coating of steel structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510848675.6A CN106811716A (en) | 2015-11-30 | 2015-11-30 | The construction technology of anticorrosive composite coating of steel structure |
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| CN106811716A true CN106811716A (en) | 2017-06-09 |
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| CN201510848675.6A Pending CN106811716A (en) | 2015-11-30 | 2015-11-30 | The construction technology of anticorrosive composite coating of steel structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557716A (en) * | 2017-10-12 | 2018-01-09 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of processing method of icing wind tunnel internal face anticorrosive coat |
| CN108588625A (en) * | 2018-07-31 | 2018-09-28 | 中研智能装备有限公司 | A kind of steel construction ZnAlMgSiB corrosion-inhibiting coatings and preparation method thereof |
| CN108893698A (en) * | 2018-07-31 | 2018-11-27 | 中研智能装备有限公司 | Steel construction ZnAlMgTiSiB corrosion-inhibiting coating and preparation method thereof |
| 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 |
| CN114011691A (en) * | 2021-11-08 | 2022-02-08 | 上饶鑫邦绿色装配建筑科技有限公司 | Anti-corrosion treatment method for building steel member |
-
2015
- 2015-11-30 CN CN201510848675.6A patent/CN106811716A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557716A (en) * | 2017-10-12 | 2018-01-09 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of processing method of icing wind tunnel internal face anticorrosive coat |
| CN108588625A (en) * | 2018-07-31 | 2018-09-28 | 中研智能装备有限公司 | A kind of steel construction ZnAlMgSiB corrosion-inhibiting coatings and preparation method thereof |
| CN108893698A (en) * | 2018-07-31 | 2018-11-27 | 中研智能装备有限公司 | Steel construction ZnAlMgTiSiB corrosion-inhibiting coating and preparation method thereof |
| 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 |
| CN114011691A (en) * | 2021-11-08 | 2022-02-08 | 上饶鑫邦绿色装配建筑科技有限公司 | Anti-corrosion treatment method for building steel member |
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