CN102154608A - Steel structure anti-corrosion process - Google Patents
Steel structure anti-corrosion process Download PDFInfo
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- CN102154608A CN102154608A CN2010101093927A CN201010109392A CN102154608A CN 102154608 A CN102154608 A CN 102154608A CN 2010101093927 A CN2010101093927 A CN 2010101093927A CN 201010109392 A CN201010109392 A CN 201010109392A CN 102154608 A CN102154608 A CN 102154608A
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Abstract
The invention provides a steel structure anti-corrosion process, which comprises the following steps of: purifying the surface of a steel structure; derusting by sandblast; spraying aluminum by using electric arc; spraying base paints; and spraying finish paints. The process of spraying the aluminum by the electric arc comprises the following steps of: heating linear aluminum wires of which the purity is more than or equal to 99.5 percent into a molten state by using an electric arc pistol and using the electric arc as a heat source; blowing molten aluminum into a mist state by using compressed air; forming constrained particle flow; and uniformly spraying the particle flow on the surface of a matrix to form an aluminum layer. In the steel structure anti-corrosion process, the bonding force of an anticorrosive coating and a steel structure matrix is high, reaches 12.0 MPa on average, and is greatly higher than that of national standards, so that the aim of long-term corrosion resistance can be fulfilled, and the appearance of the structure is improved.
Description
Technical field
The present invention relates to the steel construction surface anticorrosion, relate in particular to a kind of anticorrosion of steel structure technology.
Background technology
Expose the steel construction in the lowered in field environment to the open air, its surface is very easily with surrounding environment generation chemistry and electrochemical action and corrosion.Therefore need be at its surface-coated one deck preservative coat to protect the steel construction body not by corrosion.But when the corrosion protection coating poor-performing on steel construction surface and when damaged, also can make the steel construction body be exposed to outer and produce corrosion.Steel building is generally large-scale permanent construction, the service year limit for length, and maintenance difficult must be carried out effective long-effective corrosion, to guarantee the work-ing life of buildings.
Summary of the invention
Purpose of the present invention exactly in order to address the above problem, provides a kind of favorable anti-corrosion effect of coating, the anticorrosion of steel structure technology of long service life.
In order to achieve the above object, the present invention has adopted following technical scheme: a kind of anticorrosion of steel structure technology, its step comprise surface cleaning processing, derusting by sandblast, spraying priming paint and spray paint; Be characterized in, also comprise the electric arc aluminium spraying step, the electric arc aluminium spraying step is arranged on after the derusting by sandblast step and sprays before the priming paint step; Described electric arc aluminium spraying is to adopt arc pistol, with electric arc is thermal source, and the wire aluminium wire of purity 〉=99.5% is heated to molten state, blows out fused aluminium vaporific with pressurized air simultaneously, and form affined grain flow, evenly be sprayed on matrix surface and form one deck aluminium lamination.
The distance of spray gun and matrix surface is controlled at 150～200mm during described electric arc aluminium spraying, and spray angle is controlled at 60 degree-90 degree, and the spray gun translational speed is controlled at 300～400mm/s, and the transfer rate of aluminium wire is controlled at 1～4m/min; Arc voltage is controlled at 24～34V, and flame current is controlled at 100～300A, and compressed air pressure is controlled at 0.6～0.7Mpa.
Described electric arc aluminium spraying adopts the layering spraying, and the spraying direction of one deck formed for 45 degree intersecting to 90 degree with the spraying direction of spraying back one deck before the spraying; The aluminum layer thickness that forms after spraying is finished is controlled at 120 μ m～240 μ m, and Roughness Surface on Control is at Rz40～90 μ m.
Band corner angle steel sand is adopted in described derusting by sandblast, and the sand grains size is controlled at 0.5-2.0mm, and the sandblast gaseous tension is controlled at 0.50-0.60MPa, and the sandblast distance is controlled at 100-200mm, and the sandblast angle is controlled at 70 degree-80 degree.
Described spraying priming paint and spray paint adopt high pressure airless spraying apparatus to spray respectively, pressure-controlling is at 0.50～0.60Mpa, spray distance is controlled at 70～200mm, and the angle of spray gun and matrix surface is controlled at 45 degree to 90 degree, and the even translational speed of spray gun is controlled at 300～400mm/s.
Adopt anticorrosion of steel structure technology 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 purpose of long-effective corrosion and improve the outward appearance of structure.
Embodiment
The concrete implementation step of anticorrosion of steel structure technology of the present invention is as follows:
The first step: preparatory stage
Comprise the investigation of construction environment, project scale etc. and the preparation of various preparation of construction.
Second step: surface cleaning is handled
Before the derusting by sandblast, at first check the outward appearance on construction object (as girder steel and other steel construction) surface, to the surface have that overlap, splash, pin hole, overlap and burr are lofty, welding slag etc., the cleaning of polishing, sharp corner is processed into the fillet more than the radius 2mm; Remove grease, grease, soluble salt, rust, oxide skin etc. and other dirt of matrix surface with cleanings such as sanitising agent or solvents.The surface treatment quality reaches drying, free from dust, no grease, no dirt, no rust staining and other comprises the pollution of solubility salt, reaches GB 11373-89 code requirement.
The 3rd step: derusting by sandblast
Derusting by sandblast is to concern one of principal element of girder steel and other anticorrosion of steel structure painting effect.In order to reach the derusting by sandblast standard of Sa3 level, sand-blasting abrasive adopts band corner angle steel sand.The sand grains size is controlled at 0.5-2.0mm, and water ratio is less than 1%, and cleaning is clean, meets GB11373-89 regulation (reclaiming sand will clean, dries, screen).
The pressurized air that sandblast is used must keep clean and is dry, and air compressor machine will be equipped with dehumidifying, oil removing treating plant, keeps the sandblast gaseous tension stable in the sandblast process, roughly at 0.5-0.60MPa.The sandblast distance roughly remains in the 100-200mm scope.The sandblast angle should remain on the best sandblast level of 70 degree-80 degree, and the matrix roughness should increase with the increase of sandblast angle.Derusting by sandblast Sa2.5 level, and surface clearness reaches the Sa3 level, and it is Rz60-100 μ m that derusting by sandblast Sa3 level requires roughness, and the steel sand particle is 0.5-2.0mm.Reach the GB8923-88 standard.Sandblast environmental requirement relative humidity is smaller or equal to 80%, outdoor forbidding in weather operations such as sleet, dewfall.The sandblast envrionment temperature is higher than 5 ℃, and the basal plane actual temperature is higher than 5 ℃ of dew-point temperatures.
The sandblast quality examination adopts 223 numeric type surface roughness measuring instruments to measure.The derusting by sandblast effect reaches: no rusty stain, no dirt, non-scale, no grease grease, free from dust and other pollution, and matrix surface presents uniform canescence metalluster, and roughness is Rz25-100 μ m.
The 4th step: electric arc aluminium spraying (aluminum layer thickness reaches 120 μ m～240 μ m)
To carry out the electric arc aluminium spraying construction after the steel construction matrix surface sandblastings such as girder steel as early as possible, avoid secondary pollution.Preferably be no more than 12 hours pitch time.
The wire aluminium wire of spraying usefulness, aluminium purity 〉=99.5%, gauge or diameter of wire exists
Smooth surface is clean, does not have and scrapes bits, breach, seriously twists and warps and twist together, and non-oxidation, no grease or other pollution meet the GB/T3190-96 standard.
Spray angle is greater than 60 ° during electric arc spraying, and distance is controlled at 150～200mm, and the even translational speed of spray gun is controlled at 300～400mm/s, and the transfer rate of aluminium wire is controlled at 1～4m/min.
The spraying aluminium lamination adopts the layering spraying, and the spraying direction of preceding one deck and back one deck must form 45 degree to the intersecting of 90 degree, to guarantee the even and high-adhesion of coating.The coatingsurface roughness is generally between Rz40～90 μ m after aluminium-plated the finishing.
In the aluminium-plated process, note the temperature conditions on steel construction surface, the matrix surface temperature must not surpass 200 ℃ in the arc spray process, if temperature is too high, stop spraying, treats its suitable cooling.Temperature should be 5 ℃＜t＜35 ℃ during spraying, and humidity is less than 80%.
The electric arc spraying voltage control is at 24～34V, and current control is at 100～300A.Guaranteeing to safeguard that arc voltage suitably is controlled at lower level under the arc stability incendiary prerequisite, reducing and reducing the power supply waste to prevent coating quality; According to the diameter of aluminium wire and for silk speed, regulate flame current; For improving spray efficiency, reduce void content and oxide content, improve coating quality, can keep the high workload levels of current during spraying.
Atomization pressure should remain on 0.6～0.7Mpa, and (it is 0.40～0.50Mpa) that GB requires.
Be equipped with oil removing, dehumidifying treating plants such as air filter, guarantee gases used drying and oily not.Guarantee that normal gaseous tension is all very important to the thickness tolerance and the sticking power quality control of aluminium lamination.
Should reserve the weld during electric arc spraying anticorrosive construction in the steel construction source mill, every side is reserved width 50mm, and blended rubber band paper is pasted protection.
The 5th step: aluminium lamination quality examination
Comprise visual inspection, thickness inspection and anchoring strength of coating (bonding force).Visual inspection requirement aluminum metal layer particle is fine and closely woven, thickness is even, and solid impurity, bubble, hole, crack etc. must not be arranged.
Thickness inspection requirements aluminum layer thickness is (wherein A is a design requirements thickness) between A+20 μ m～A-30 μ m, uses magnetic-type gage to detect, and the measuring point at random.
(aluminum coating is granular accumulation horizon, and proportion is gently more a lot of than aluminum metal entity, many spaces between particle in the coating, and coatingsurface is coarse, and the coat-thickness tolerance is bigger, and this is a kind of outwardness; Select appropriate aluminum coating thickness very important, the too thick coating stripping that easily causes of coating.Reason is that the thermal expansivity of aluminum coating and body material is different, thereby causes the different internal stresss that produce of shrinkage between the two.Along with coat-thickness increases, the also corresponding increase of internal stress in the coating, cohesive strength descends, and when this internal stress surpassed its cohesive strength, phenomenon just appearred peeling off in coating.)
The 6th step: spraying epoxy seal coat and polyurethane finish
After matrix surfaces such as girder steel are aluminium-plated, spray seal coat when matrix surface is still had a surplus temperature, therefore spraying priming paint preparation work will fulfil ahead of schedule, and the timed interval must not surpass 5h.
Before the spraying priming paint, the electric arc spraying laminar surface must not have pollution and aqueous vapor etc.; The sealing application should be in dew-point temperature more than 3 ℃, and relative humidity is carried out below 85%, and sleety weather should stop construction.The sealing application should be carried out manual precoating earlier, the position of brushing all weld seams, corner, dead angle and being difficult for spraying, to guarantee that there are enough thickness (application after to be assembled the finishing in the every side 50mm scope of butt weld place of beam section) at these positions, adopt high pressure airless spraying apparatus to spray then.
After the seal coat spraying, should be arranged certain set time, guarantee that coating does solid work, do not have holiday, no sag, no bubbling, pollution-free impurity, thickness, sticking power meet the requirements, and then the spraying polyurethane finish paint.
Pressurized gas can not contain oil gas, and wants dry, and gaseous tension is stable, roughly at 0.50～0.60Mpa.Spray distance roughly remains in 70～200mm scope.
Matrix surface such as spray gun and the girder steel direction that should meet at right angles during spraying, can't vertical position gradient should not be less than 45 ℃; Spray gun evenly moves, and speed is 300～400mm/s.
About 10～35 ℃ of spraying envrionment temperature should be strictly on guard against the matrix surface dewfall; The matrix surface temperature is higher than air dew point more than 3 ℃, and relative humidity is below 85%, and the too big influence of wind-force also should stop spraying operation when operating.Spraying is forbidden to descend to carry out at weather such as rain, snow or dewfall.Dustless or the few dirt of spraying environmental requirement cleaning.
The 7th step: quality examination
Comprise visual inspection, thickness inspection and anchoring strength of coating (seeing for the 5th step) such as (bounding forces).
Smooth, even, cleaning that seal coat and finish paint require, paint film does not have bubble, crackle, no sag, come off, defective such as holiday.The finish paint color is consistent with colorimetric card.
The 8th step: site clearing, completion
The invention has the beneficial effects as follows that the adhesion height of this coating and steel construction matrix on average reaches 12.0Mpa, is much higher than national standard, service life was above 50 years.
Claims (5)
1. anticorrosion of steel structure technology, its step comprises surface cleaning processing, derusting by sandblast, spraying priming paint and spray paint; It is characterized in that: also comprise the electric arc aluminium spraying step, the electric arc aluminium spraying step is arranged on after the derusting by sandblast step and sprays before the priming paint step; Described electric arc aluminium spraying is to adopt arc pistol, with electric arc is thermal source, and the wire aluminium wire of purity 〉=99.5% is heated to molten state, blows out fused aluminium vaporific with pressurized air simultaneously, and form affined grain flow, evenly be sprayed on matrix surface and form one deck aluminium lamination.
2. anticorrosion of steel structure technology as claimed in claim 1, it is characterized in that: the distance of spray gun and matrix surface is controlled at 150～200mm during described electric arc aluminium spraying, spray angle is controlled at 60 degree-90 degree, the spray gun translational speed is controlled at 300～400mm/s, and the transfer rate of aluminium wire is controlled at 1～4m/min; Arc voltage is controlled at 24～34V, and flame current is controlled at 100～300A, and compressed air pressure is controlled at 0.6～0.7Mpa.
3. anticorrosion of steel structure technology as claimed in claim 1 is characterized in that: described electric arc aluminium spraying adopts the layering spraying, and the spraying direction of one deck formed for 45 degree intersecting to 90 degree with the spraying direction of spraying back one deck before the spraying; The aluminum layer thickness that forms after spraying is finished is controlled at 120 μ m～240 μ m, and Roughness Surface on Control is at Rz40～90 μ m.
4. anticorrosion of steel structure technology as claimed in claim 1, it is characterized in that: band corner angle steel sand is adopted in described derusting by sandblast, and the sand grains size is controlled at 0.5-2.0mm, and the sandblast gaseous tension is controlled at 0.50-0.60MPa, the sandblast distance is controlled at 100-200mm, and the sandblast angle is controlled at 70 degree-80 degree.
5. anticorrosion of steel structure technology as claimed in claim 1, it is characterized in that: described spraying priming paint and spray paint adopt high pressure airless spraying apparatus to spray respectively, pressure-controlling is at 0.50～0.60Mpa, spray distance is controlled at 70～200mm, the angle of spray gun and matrix surface is controlled at 45 degree to 90 degree, and the even translational speed of spray gun is controlled at 300～400mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101093927A CN102154608A (en) | 2010-02-11 | 2010-02-11 | Steel structure anti-corrosion process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101093927A CN102154608A (en) | 2010-02-11 | 2010-02-11 | Steel structure anti-corrosion process |
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| CN102154608A true CN102154608A (en) | 2011-08-17 |
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| CN2010101093927A Pending CN102154608A (en) | 2010-02-11 | 2010-02-11 | Steel structure anti-corrosion process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518333A (en) * | 2011-12-30 | 2012-06-27 | 山东省呈祥电工电气有限公司 | Pollution flashover-prevention, corrosion-prevention and freezing-prevention electric tower and surface treatment method thereof |
| CN102691405A (en) * | 2012-06-04 | 2012-09-26 | 江苏金土木建设集团有限公司 | Construction method for spraying foaming polyurethane heat-preservation and water-proof layer |
| CN103290174A (en) * | 2012-02-28 | 2013-09-11 | 安徽鸿路钢结构(集团)股份有限公司 | Steel structure production line additionally with modification treatment and anti-corrosion treatment |
| CN104088370A (en) * | 2014-05-29 | 2014-10-08 | 中建钢构有限公司 | High-strength bolt friction-type connecting structure and connection node performance optimizing method thereof |
| CN111364033A (en) * | 2020-03-31 | 2020-07-03 | 太仓红马机械设备制造有限公司 | Anticorrosion and wear-resistant treatment process suitable for steel members of garbage incinerator |
| CN114012510A (en) * | 2021-11-23 | 2022-02-08 | 贵州电网有限责任公司 | Full-automatic production line for thermal aluminum spraying anti-corrosion treatment based on robot and visual identification |
| CN115011908A (en) * | 2022-06-14 | 2022-09-06 | 广东省源天工程有限公司 | Rare earth aluminum alloy anticorrosion thermal spraying construction method suitable for seawater environment |
-
2010
- 2010-02-11 CN CN2010101093927A patent/CN102154608A/en active Pending
Non-Patent Citations (2)
| Title |
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| 《适用技术市场》 19971130 黎定标等 电弧喷铝层的制备及应用 第17-19页 1-5 , 第11期 * |
| 《钢结构》 20050430 黄群英 厦门环岛路钟宅湾大桥钢结构电弧喷铝施工质量控制 第69-71页 1-5 第20卷, 第2期 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518333A (en) * | 2011-12-30 | 2012-06-27 | 山东省呈祥电工电气有限公司 | Pollution flashover-prevention, corrosion-prevention and freezing-prevention electric tower and surface treatment method thereof |
| CN102518333B (en) * | 2011-12-30 | 2014-06-04 | 山东省呈祥电工电气有限公司 | Pollution flashover-prevention, corrosion-prevention and freezing-prevention electric tower and surface treatment method thereof |
| CN103290174A (en) * | 2012-02-28 | 2013-09-11 | 安徽鸿路钢结构(集团)股份有限公司 | Steel structure production line additionally with modification treatment and anti-corrosion treatment |
| CN102691405A (en) * | 2012-06-04 | 2012-09-26 | 江苏金土木建设集团有限公司 | Construction method for spraying foaming polyurethane heat-preservation and water-proof layer |
| CN104088370A (en) * | 2014-05-29 | 2014-10-08 | 中建钢构有限公司 | High-strength bolt friction-type connecting structure and connection node performance optimizing method thereof |
| CN111364033A (en) * | 2020-03-31 | 2020-07-03 | 太仓红马机械设备制造有限公司 | Anticorrosion and wear-resistant treatment process suitable for steel members of garbage incinerator |
| CN114012510A (en) * | 2021-11-23 | 2022-02-08 | 贵州电网有限责任公司 | Full-automatic production line for thermal aluminum spraying anti-corrosion treatment based on robot and visual identification |
| CN115011908A (en) * | 2022-06-14 | 2022-09-06 | 广东省源天工程有限公司 | Rare earth aluminum alloy anticorrosion thermal spraying construction method suitable for seawater environment |
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Application publication date: 20110817 |