CN101451243B - Method and process of steel structure arc spraying composite corrosion proof coating system - Google Patents
Method and process of steel structure arc spraying composite corrosion proof coating system Download PDFInfo
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Abstract
The invention provides a method and a process for spraying a composite anticorrosive coating system by electric arc for a steel structure, which belong to the method and the process for anticorrosion of the steel structure. In the anticorrosive coating system, first, rust removal and coarsing are carried out on the surface of the steel structure; then, an anode metal coating is sprayed by electric arc; then, a nanometer modified epoxy seal paint as a primer coating, an MIO epoxy paint or nanometer modified MIO epoxy paint as an intermediate paint coating, and a nanometer modified fluorine-containing polyurethane paint or fluorine-containing polysiloxane paint or siloxane modified acrylic polyurethane as a finishing coating are coated on the metal coating in sequence. The composite anticorrosive coating system has excellent performances of corrosion resistance, weather resistance, stain resistance, chemical product resistance, decoration and the like, and can obviously reduce or remit anticorrosive maintenance work and cost of the steel structure in late stage.
Description
Technical field
The present invention relates to a kind of method and technology of anticorrosion of steel structure erosion resisting coating system, particularly a kind of steel structure arc spraying composite corrosion proof coating system.
Background technology
At present, the main anti-corrosion method of steel construction is the heavy duty system coating system both at home and abroad, and this coating system is by triple coating heavy duty systems of forming of inorganic or epoxy zinc rich primer, epoxy intermediate coat and polyurethane finish.Abominable day by day along with corrosive environment; ultraviolet ray, corrosive medium etc. are to the destruction of compound coating; cause hydrocarbon molecules chain break in the organic composition; so that coating be full of cracks, the inefficacy of atomizing aging appear; make this coating system very limited to the protection life-span of iron and steel; the protection period of each construction only 3～8 years still needs to spend great amount of manpower and material resources are keeped in repair, and has caused the continuous growth of protection cost.
Chinese invention patent " a kind of anti-corrosion method of the marine steel " patent No. is 00111047.0, a kind of anti-corrosion method of marine steel is disclosed, earlier pre-treatment is carried out by sandblast in the surface of iron and steel parts, re-use flame or arc pistol and spray spelter coating and aluminum coating or aluminium aluminium zinc coating successively, carry out sealing treatment at above-mentioned metallic coating external coating organic coating at last.Described organic coating is chlorinated rubber coating, Resins, epoxy lacquering or high chlorine polyethylene coating.
Chinese invention patent " steel structure supersonic electric arc aluminium spraying anticorrosion coat technology ", application number is 200510017831.0, a kind of steel structure supersonic electric arc aluminium spraying anticorrosion coat technology is disclosed, earlier with the steel construction surface derusting, alligatoring, adopt then that two aluminium wires are coated material in the arc-spraying machine, with the short circuiting arc is thermal source, high-pressure air is with the aluminium drop atomizing of fusion, the gun slot of arc-spraying machine is provided with the Lavalle blast cap, form secondary-atomizing and produce supersonic speed particle jet and be sprayed directly into the steel matrix surface and form the aluminum metal coating, and spraying or brushing seal coat form described anticorrosion coat on this coating.Described seal coat is a vibrin.
Along with the research of arc spraying technology and equipment constantly makes substantial progress, people bring into use arc spraying technology that iron and steel is carried out rotproofing, but common electric arc spraying compound coating is in the face of rugged environments such as ocean, city acid rains the time, still exist a lot of not enough, still not high enough such as the protection against corrosion time limit, weathering resistance is still strong inadequately, decorative surface shortcoming etc.
Summary of the invention
Order of the present invention provides the method and the technology of a kind of good weatherability, the protection against corrosion life-span is long, life-cycle cost is low, result of use is good steel structure arc spraying composite corrosion proof coating system.
The object of the present invention is achieved like this: the method for this steel structure arc spraying composite corrosion proof coating system: constitute by lining and outer electric arc spraying positive polarity metallic coating, seal coat coating, intermediate coat coating and the topcoat four part corrosion protection coatings of adopting,
Described electric arc spraying positive polarity metallic coating, the used metal wire material of electric arc spraying is an aluminium wire in this coating, aluminium content in the aluminium wire more than or equal to 99.5%, the zinc silk, zinc content in the zinc silk more than or equal to 99.99%, Zn-Al alloy wire, aluminium content is 10-15% in the Zn-Al alloy wire, all the other are zinc, aluminum-magnesium alloy wire, magnesium contains 3-5% in the aluminum-magnesium alloy wire, all the other are aluminium, rare earth aluminium wire, contain rare earth element rhenium 0.1-0.7% in the rare earth aluminium wire, all the other are aluminium, a kind of material or two kinds of silk materials in these five kinds of silk materials, and the thickness of metallize coating is 100～300 μ m;
Described seal coat coating, one of application or twice nanometer modified epoxy sealing paint in this coating, coating dry film thickness is 10～60 μ m;
Described intermediate coat coating, one of application or twice epoxy cloud iron-dope or nanometer modified epoxy cloud iron-dope in this coating, coating dry film thickness is 60～120 μ m;
Described topcoat, one of application or twice nano modification fluorochemical urethane coating or fluorinated polysiloxane coating or silicone-modified acroleic acid polyurethane coating in this coating, coating dry film thickness is 30～100 μ m.
Realize process technology scheme of the present invention:
(1) derusting by sandblast
Adopt the method for derusting by sandblast to remove steel construction surface corrosion product and old coating, the surface clearness of the steel substrate after the processing should reach Sa2.5 level or Sa3 level, and surfaceness should reach Rz25-100 μ m;
(2) electric arc spraying
According to the residing environmental properties of steel construction, selection metallize material is one or both in aluminium, zinc, aluminium zinc, aluminum magnesium alloy, the rare earth aluminium; Used metallize material diameter equates, is 2mm or 3mm;
For the big and smooth steel construction surface of area, adopt the above high-power arc spraying machine of spraying working current 500A to spray; Other steel construction surface adopts the following electric arc spraying equipment of spraying working current 400A to spray; The spraying operating voltage is 22～36V;
When beginning spraying the spraying machine power supply that at first closes, open the spraying machine air supply valve, regulate electric current and voltage to the processing parameter that requires, spray gun formally sprays need spraying face after the spraying normally facing to non-spraying interview spray again; After spraying finishes, stop spraying, close source of the gas, the power switch of leaving behind; The thickness of electric arc spraying metallic coating is 100～300 μ m; Need continue to fill spray when not enough till qualified when detecting coat-thickness;
(3) seal coat coating
The surface of sprayed metal coating is behind dusting out and macrobead, and application together or the twice nanometer modified epoxy sealing paint in 12 hours; Coating dry film thickness is 10～60 μ m;
(4) intermediate coat coating
The seal coat coating is at room temperature behind drying at least 4 hours and the paint film surface drying, and application together or twice epoxy cloud iron-dope or nanometer modified epoxy cloud iron-dope; Coating dry film thickness is 60～120 μ m;
(5) topcoat
The intermediate coat coating to middle lacquering surface is cleared up after at room temperature drying 24 hours and paint film are done solid work at least, removes surface contaminants and dust; One of application or twice nano modification fluorochemical urethane coating or fluorinated polysiloxane coating or silicone-modified acroleic acid polyurethane coating, coating dry film thickness is 30～100 μ m.
Beneficial effect: owing to adopted aforesaid method, electric arc spraying positive polarity metallic coating provides the galvanic protection effect of sacrificial anode to the steel construction matrix, is not subjected to ultraviolet ray, the corrosive medium destruction to steel construction; Adopt seal coat coating, intermediate coat coating and topcoat; these organic coating coating effective closure sprayed metal coatings; the destruction that the protection sprayed metal coating is not subjected to ocean, city acid rain; isolate of the erosion of various corrosive mediums with physics mode to sprayed metal coating and steel substrate; also have ornamental simultaneously; the protection against corrosion time limit is higher, and solidity to corrosion, weathering resistance, resistance to soiling, chemicals-resistant, ornamental more excellent have reached purpose of the present invention.
Advantage: this composite corrosion proof coating system combines the advantage of electric arc spraying positive polarity metallic coating and paint sealing barrier coat, have excellent protection against corrosion, weathering resistance, resistance to soiling, chemicals-resistant, performance such as ornamental, theoretical anti-corrosion capability reaches 50～100 years, can significantly reduce or remit protection against corrosion maintenance service of steel construction later stage and expense.Use above-mentioned nano modification fluorochemical urethane coating or fluorinated polysiloxane coating or silicone-modified acroleic acid polyurethane coating, improved the surface decoration performance of coating system, more can satisfy Contemporary Architecture to steel construction artistic design, aesthetics and landscape design reach the perfect adaptation of the quality and the places of cultural interest.The composite corrosion proof coating system of this steel construction has important economic benefit and social benefit.
Embodiment
Embodiment 1: certain steel construction test specimen, adopt the method for derusting by sandblast to remove steel construction surface corrosion product earlier, the surface clearness of the steel substrate after the processing is the Sa3 level, surfaceness is Rz25-100 μ m, use the aluminium wire of two diameter 3.0mm then, aluminium content in the aluminium wire is 99.5%, and at steel construction surface arcing spraying aluminum coating, the metallic aluminium coat-thickness is 180 μ m; Remove the dust and the macrobead of metal spraying laminar surface again, application twice nanometer modified epoxy sealing paint is as primer coating in 12 hours, and coating dry film thickness is 40 μ m; After 24 hours, application twice epoxy cloud iron-dope is made the intermediate coat coating in seasoning under the room temperature behind the seal coat paint coating, and coating dry film thickness is 100 μ m; After intermediate coat coating seasoning at room temperature 24 hours and paint film are done solid work, middle lacquering surface is cleared up, removed surface contaminants and dust, application twice nano modification fluorochemical urethane coating is made topcoat, and coating dry film thickness is 80 μ m.Obtain a steel construction test specimen that adopts described arc spraying composite corrosion proof coating system thus.
This steel construction test specimen is carried out the on-the-spot corrosion test of marine atmosphere zone, splash zone, tidal range district and submerged zone on China's East Sea marine corrosion test platform, take out the steel construction test specimen, the compound coating surface topography of finding the steel construction test specimen does not change, only the coatingsurface of submerged zone has a spot of marine life to adhere to, and crackle does not all appear in all coatingsurfaces, phenomenon such as bubble, get rusty, come off.
Embodiment 2: certain steel construction test specimen, adopt the method for derusting by sandblast to remove steel construction surface corrosion product earlier, the surface clearness of the steel substrate after the processing is the Sa3 level, surfaceness is Rz25-100 μ m, use the aluminium wire of a diameter 3.0mm then, the aluminium content in the aluminium wire is the zinc silk of 99.5% and diameter 3.0mm, and the zinc content in the zinc silk is 99.99%, in steel construction surface arcing spraying zinc aluminium false alloy coating, the metal spraying layer thickness is 250 μ m; Remove the dust and the macrobead of metal spraying laminar surface again, one nanometer modified epoxy sealing paint of application is as primer coating in 12 hours, and coating dry film thickness is 10 μ m; After behind the seal coat paint coating 24 hours, one nanometer modified epoxy cloud of application iron-dope is made the intermediate coat coating, and coating dry film thickness is 60 μ m; After intermediate coat coating at room temperature dry 24 hours and paint film are done solid work, middle lacquering surface is cleared up, removed surface contaminants and dust, application twice nano modification fluorinated polysiloxane coating is made topcoat, and coating dry film thickness is 80 μ m.Obtain a steel construction test specimen that adopts described arc spraying composite corrosion proof coating system thus.
This steel construction test specimen is carried out the on-the-spot corrosion test of marine atmosphere zone, splash zone, tidal range district and submerged zone on China's East Sea marine corrosion test platform, take out the steel construction test specimen, the compound coating surface topography of finding the steel construction test specimen does not change, only the coatingsurface of submerged zone has a spot of marine life to adhere to, and crackle does not all appear in all coatingsurfaces, phenomenon such as bubble, get rusty, come off.
Embodiment 3: certain steel construction test specimen, adopt the method for derusting by sandblast to remove steel construction surface corrosion product earlier, the surface clearness of the steel substrate after the processing is the Sa3 level, surfaceness is Rz25-100 μ m, use the Zn-Al alloy wire of two diameter 2.0mm then, the aluminium content in the Zn-Al alloy wire is 15%, and all the other are zinc, in steel construction surface arcing spraying aluminium zinc coating, the metal spraying layer thickness is 120 μ m; Remove the dust and the macrobead of metal spraying laminar surface again, application twice nanometer epoxy sealing paint is as primer coating in 12 hours, and coating dry film thickness is 40 μ m; After behind the seal coat paint coating 24 hours, one nanometer modified epoxy cloud of application iron-dope is made the intermediate coat coating, and coating dry film thickness is 60 μ m; After intermediate coat coating at room temperature dry 24 hours and paint film are done solid work, middle lacquering surface is cleared up, removed surface contaminants and dust, the silicone-modified acroleic acid polyurethane coating of application twice is made topcoat, and coat-thickness is 90 μ m.Obtain a steel construction test specimen that adopts described arc spraying composite corrosion proof coating system thus.
This steel construction test specimen is carried out the on-the-spot corrosion test of marine atmosphere zone, splash zone, tidal range district and submerged zone on China's East Sea marine corrosion test platform, take out the steel construction test specimen, the compound coating surface topography of finding the steel construction test specimen does not change, only the coatingsurface of submerged zone has some marine lifes to adhere to, and crackle does not all appear in all coatingsurfaces, phenomenon such as bubble, get rusty, come off.
Embodiment 4: certain steel construction test specimen, adopt the method for derusting by sandblast to remove steel construction surface corrosion product earlier, the surface clearness of the steel substrate after the processing is the Sa2.5 level, surfaceness is Rz25-100 μ m, use the aluminum-magnesium alloy wire of two diameter 3.0mm then, the Mg content in the aluminum-magnesium alloy wire is 3.5%, and all the other are aluminium, in steel construction surface arcing spraying aluminum magnesium alloy coating, the metal spraying layer thickness is 160 μ m; One nanometer epoxy sealing paint of application is as primer coating in 12 hours, and coating dry film thickness is 10 μ m; After behind the seal coat paint coating 24 hours, application twice epoxy cloud iron-dope is made the intermediate coat coating, and coating dry film thickness is 120 μ m; After intermediate coat coating at room temperature dry 24 hours and paint film are done solid work, middle lacquering surface is cleared up, removed surface contaminants and dust, the silicone-modified acroleic acid polyurethane coating of application twice is made topcoat, and coating dry film thickness is 100 μ m.Other and embodiment 1 omit together.
Embodiment 5: certain steel construction test specimen, adopt the method for derusting by sandblast to remove steel construction surface corrosion product earlier, the surface clearness of the steel substrate after the processing is the Sa3 level, surfaceness is Rz25-100 μ m, use the rare earth aluminium wire of two diameter 3.0mm then, the content of the rare earth rhenium in the rare earth aluminium wire is 0.2%, and all the other are aluminium, at steel construction surface arcing spraying rare earth aluminum coating, the metal spraying layer thickness is 200 μ m; One nanometer epoxy sealing paint of application is as primer coating in 12 hours, and coating dry film thickness is 10 μ m; After behind the seal coat paint coating 24 hours, application twice nanometer modified epoxy cloud iron-dope is made the intermediate coat coating, and coating dry film thickness is 120 μ m; After intermediate coat coating at room temperature dry 24 hours and paint film are done solid work, middle lacquering surface is cleared up, removed surface contaminants and dust, topcoat is made in application silicone-modified acroleic acid polyurethane coating together, and coating dry film thickness is 40 μ m.Other and embodiment 1 omit together.
Claims (2)
1. the method for a steel structure arc spraying composite corrosion proof coating system is characterized in that: be made of lining and outer electric arc spraying positive polarity metallic coating, seal coat coating, intermediate coat coating and the topcoat four part corrosion protection coatings of adopting;
Described electric arc spraying positive polarity metallic coating, the used metal wire material of electric arc spraying is a kind of material or the two kinds of silk materials in aluminium wire, zinc silk, Zn-Al alloy wire, aluminum-magnesium alloy wire, the rare earth aluminium wire in this coating, wherein the aluminium content in the aluminium wire is more than or equal to 99.5%, zinc content in the zinc silk is more than or equal to 99.99%, aluminium content is 10-15% in the Zn-Al alloy wire, all the other are zinc, magnesium contains 3-5% in the aluminum-magnesium alloy wire, all the other are aluminium, contain rare earth element rhenium 0.1-0.7% in the rare earth aluminium wire, all the other are for aluminium, the thickness of sprayed metal coating is 100～300 μ m;
Described seal coat coating, one of application or twice nanometer modified epoxy sealing paint in this coating, coating dry film thickness is 10～60 μ m;
Described intermediate coat coating, one of application or twice epoxy cloud iron-dope or nanometer modified epoxy cloud iron-dope in this coating, coating dry film thickness is 60～120 μ m;
Described topcoat, one of application or twice nano modification fluorochemical urethane coating or fluorinated polysiloxane coating or silicone-modified acroleic acid polyurethane coating in this coating, coating dry film thickness is 30～100 μ m.
2. the technology of a steel structure arc spraying composite corrosion proof coating system is characterized in that:
(1) derusting by sandblast: adopt the method for derusting by sandblast to remove steel construction surface corrosion product and old coating, the surface clearness of the steel substrate after the processing should reach Sa2.5 level or Sa3 level, and surfaceness should reach Rz25-100 μ m;
(2) electric arc spraying: according to the residing environmental properties of steel construction, selection metallize material is one or both in aluminium, zinc, aluminium zinc, aluminum magnesium alloy, the rare earth aluminium; Used metallize material diameter equates, is 2mm or 3mm;
For the big and smooth steel construction surface of area, adopt the above high-power arc spraying machine of spraying working current 500A to spray; Other steel construction surface adopts the following electric arc spraying equipment of spraying working current 400A to spray; The spraying operating voltage is 22～36V;
When beginning spraying the spraying machine power supply that at first closes, open the spraying machine air supply valve, regulate electric current and voltage to the processing parameter that requires, spray gun formally sprays need spraying face after the spraying normally facing to non-spraying interview spray again; After spraying finishes, stop spraying, close source of the gas, the power switch of leaving behind; The thickness of electric arc spraying metallic coating is 100～300 μ m; Need continue to fill spray when not enough till qualified when detecting coat-thickness;
(3) seal coat coating: the surface of sprayed metal coating is behind dusting out and macrobead, and application together or the twice nanometer modified epoxy sealing paint in 12 hours; Seal coat coating dry film thickness is 10～60 μ m;
(4) intermediate coat coating: the seal coat coating is at room temperature behind drying at least 4 hours and the paint film surface drying, and application together or twice epoxy cloud iron-dope or nanometer modified epoxy cloud iron-dope; Coating dry film thickness is 60～120 μ m;
(5) topcoat: the intermediate coat coating to middle lacquering surface is cleared up after at room temperature drying 24 hours and paint film are done solid work at least, removes surface contaminants and dust; One of application or twice nano modification fluorochemical urethane coating or fluorinated polysiloxane coating or silicone-modified acroleic acid polyurethane coating, coating dry film thickness is 30～100 μ m.
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Denomination of invention: Method and process of steel structure arc spraying composite corrosion proof coating system Effective date of registration: 20180213 Granted publication date: 20110727 Pledgee: Xuzhou Productivity Promotion Center Pledgor: Jiangsu CUMT Dazheng Surface Engineering Technology Co.,Ltd. Registration number: 2018320000022 |