CN104259079B - The pre-spraying coating process of steel bridge case beam cold spray zinc - Google Patents

Abstract

The present invention relates to the pre-spraying coating process of a kind of steel bridge case beam cold spray zinc, it is characterized in that comprising the following steps: surface treatment, through Shot Blasting after steel plate cutting, homogeneous metal color and luster is exposed on surface, reserved welding bead, steel plate after allly needing to splice, organizing right blanking is reserved the wide weld seam of 50mm ~ 100mm, and adopts Continuous pressing device for stereo-pattern to be covered by weld seam; Spraying the present invention adopts the surface of steel plate of airless spraying equipment after allly needing to splice, organizing right blanking to apply 85 μm ± 25 μm thick cold spray spelter coatings, assembled group pair is undertaken by spraying the steel plate after doing solid work, after being welded into steel bridge case beam, butt welded seam fills spray, paint film carries out dry paint Thickness sensitivity after doing solid work, and completes the spraying of steel bridge box girder integral.The antiseptic power that the present invention utilizes cold spray zinc powerful, not only apply it to the preservative treatment in advance of the steel plate after blanking, solve the Anticorrosion in steel bridge case beam manufacture process, also it can be used as final anticorrosive paint simultaneously, decrease and pollute and heavy physical working procedure.

Description

The pre-spraying coating process of steel bridge case beam cold spray zinc

Technical field

The invention belongs to a kind of spray painting technology field, particularly relate to the pre-spraying coating process of a kind of steel bridge case beam cold spray zinc.

Background technology

Steel bridge case beam when factory process makes from cutting stock to assembly welding time of shaping generally need several weeks even several months, the process that eliminates rust and spray paint in advance must be carried out after blanking, otherwise in fabrication cycle steel plate will by and affect overall structure performance.

In order to steel bridge case beam is not corroded in manufacturing process, people make to be coated with last layer shop primer at surface of steel plate after the process of blanking impeller blasting usually, the anti-corrosion life of shop primer was at 3 ~ 6 months, can not as the antifouling paint in bridge use procedure, after steel bridge welding completes, need to adopt the mode of artificial sandblasting thoroughly to remove to this road pretreatment primer, then spray formal anticorrosive paint.

The enclosure space that the case beam of steel bridge is divided into several not of uniform size by web, diaphragm plate, the working environment of removing shop primer of manually sandblasting is poor, labour intensity greatly, quality cannot ensure and to environment.If the direct formal paint of pre-spraying, be generally epoxy zinc rich primer, the performance of this paint and adhesive force can not adapt to the impact of welding temperature in steel plate manufacture process and mechanical scratching.Paint will come off under the impact of welding temperature, deterioration failure, and the antiseptic effect that case beam overturns in the fabrication process and destruction is painted by scratching, generally needs 24 hours in addition its drying time slowly, will affect processing progress as steel plate pretreatment in early stage paint.

Summary of the invention

The object of this invention is to provide the pre-spraying coating process of a kind of steel bridge case beam cold spray zinc, namely the process of cold spray zinc is carried out after steel plate cutting, solve the Anticorrosion in steel bridge case beam manufacture process, it is directly used as final anti-corrosion primer simultaneously, avoid again artificial abrasive jet cleaning.

The pre-spraying coating process of a kind of steel bridge case beam of the present invention cold spray zinc, is characterized in that comprising the following steps:

1) surface treatment

Through Shot Blasting after steel plate cutting, remove the visible grease of steel surface, dirt, oxide skin, iron rust and painting layer, homogeneous metal color and luster is exposed on surface,

2) reserved welding bead

Steel plate after allly needing to splice, organizing right blanking is reserved the wide weld seam of 50mm ~ 100mm, and adopts Continuous pressing device for stereo-pattern to be covered by weld seam;

3) spray

The present invention adopts the surface of steel plate of airless spraying equipment after allly needing to splice, organizing right blanking to apply 85 μm ± 25 μm thick cold spray spelter coatings,

Its cold spray spelter coating filters mesh number 50 ~ 60 order, and spray pressure ratio is greater than 30:1, atomizing pressure 12MPa ~ 16Mpa, vertical application identity distance from 300mm, application speed 100mm/ second;

4) being undertaken assembled group pair, after being welded into steel bridge case beam by spraying the steel plate after doing solid work, cleaning polishing being carried out to the reserved width range comprising welding bead, exposes metal light tone; Carry out the process of cold spray zinc at once, spray distance is 200mm, and application speed is 150 ~ 180mm/ second, and applying thick is 85 μm ± 25 μm, and with the transition of the nature of spraying area; Paint film carries out dry paint Thickness sensitivity after doing solid work, and completes the spraying of steel bridge box girder integral.

Advantage of the present invention is: owing to have employed the pre-spraying coating process of above-mentioned cold spray zinc, change painting workshop priming paint before common weldering, shop primer is all destroyed the technique spraying formal priming paint again by the artificial sandblasting of postwelding, utilize the antiseptic power that cold spray zinc is powerful, not only apply it to the preservative treatment in advance of the steel plate after blanking, solve the Anticorrosion in steel bridge case beam manufacture process, also it can be used as final anticorrosive paint simultaneously, and performance is good, strong adhesion, heat-resisting ability is strong and good, fast and the safety and environmental protection of rate of drying, artificial abrasive jet cleaning comprehensively is no longer carried out after completing, just welding bead is carried out the process of cold spray zinc, thus decrease heavily contaminated, heavy physical working procedure, it is the significant improvement of steel bridge box girder construction technique.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described.

The pre-spraying coating process of a kind of steel bridge case beam of the present invention cold spray zinc, is characterized in that comprising the following steps:

1) surface treatment

Through Shot Blasting after steel plate cutting, remove the visible grease of steel surface, dirt, oxide skin, iron rust and painting layer, homogeneous metal color and luster is exposed on surface,

2) reserved welding bead

Steel plate after allly needing to splice, organizing right blanking is reserved the wide weld seam of 50mm ~ 100mm, and adopts Continuous pressing device for stereo-pattern to be covered by weld seam;

3) spray

The present invention adopts the surface of steel plate of airless spraying equipment after allly needing to splice, organizing right blanking to apply 85 μm ± 25 μm thick cold spray spelter coatings,

Its cold spray spelter coating filters mesh number 50 ~ 60 order, and spray pressure ratio is greater than 30:1, atomizing pressure 12MPa ~ 16Mpa, vertical application identity distance from 300mm, application speed 100mm/ second;

4) being undertaken assembled group pair, after being welded into steel bridge case beam by spraying the steel plate after doing solid work, cleaning polishing being carried out to the reserved width range comprising welding bead, exposes metal light tone; Carry out the process of cold spray zinc at once, spray distance is 200mm, and application speed is 150 ~ 180mm/ second, and applying thick is 85 μm ± 25 μm, and with the transition of the nature of spraying area; Paint film carries out dry paint Thickness sensitivity after doing solid work, and completes the spraying of steel bridge box girder integral.

Preferably, cold spray spelter coating of the present invention adopts the cold spray spelter coating of ZC96.

Due to the pure Zn content more than 96% of zinc film in ZC96 cold spray spelter coating, salt spray resistance 3000 hours, can provide good cathodic protection effect and barrier protection effect for steel surface, have following characteristics:

1. long-lasting, there is the anticorrosion cycle of more than 25 years.

2. environment-friendly type, water paint, nonpoisonous and tasteless.

3. cutting resistance, coating is not by cutting damage.

4. temperature tolerance, heat resistance more than 800 DEG C, heat-resistingly in short-term reaches 1200 DEG C; Low temperature resistantly reach-60 DEG C.

5. mechanical performance, the mechanical damage abilities such as opposing scratching are strong.

6. quick-drying, when 20 DEG C, surface drying 15 minutes, does solid work 2 hours.

Claims (1)

1. the pre-spraying coating process of steel bridge case beam cold spray zinc, is characterized in that comprising the following steps:

1) surface treatment

Through Shot Blasting after steel plate cutting, remove the visible grease of steel surface, dirt, oxide skin, iron rust and painting layer, homogeneous metal color and luster is exposed on surface;

2) reserved welding bead

Steel plate after allly needing to splice, organizing right blanking is reserved the wide weld seam of 50mm ~ 100mm, and adopts Continuous pressing device for stereo-pattern to be covered by weld seam;

3) spray

The airless spraying equipment surface of steel plate after allly needing to splice, organizing right blanking is adopted to apply 85 μm ± 25 μm thick cold spray spelter coatings, its cold spray spelter coating filters mesh number 50 ~ 60 order, spray pressure ratio is greater than 30:1, atomizing pressure 12MPa ~ 16Mpa, vertical application identity distance from 300mm, application speed 100mm/ second;

4) being undertaken assembled group pair, after being welded into steel bridge case beam by spraying the steel plate after doing solid work, cleaning polishing being carried out to the reserved width range comprising welding bead, exposes metal light tone; Carry out the process of cold spray zinc at once, spray distance is 200mm, and application speed is 150 ~ 180mm/ second, and applying thick is 85 μm ± 25 μm, and with the transition of the nature of spraying area; Paint film carries out dry paint Thickness sensitivity after doing solid work, and completes the spraying of steel bridge box girder integral.